{"text_format":"dbase-jsonl-2026-09-30","columns":[{"name":"Unit_Name","type":"character","width":50},{"name":"Rock_Unit","type":"character","width":65},{"name":"Sample_No","type":"character","width":25},{"name":"Longitude","type":"float","width":19,"decimals":11},{"name":"Latitude","type":"float","width":19,"decimals":11},{"name":"Quad_1_Deg","type":"character","width":20},{"name":"Quad_24k","type":"character","width":30},{"name":"Method","type":"character","width":15},{"name":"Mineral","type":"character","width":40},{"name":"Age_Ma","type":"number","width":16,"decimals":6},{"name":"Age_Uncert","type":"character","width":10},{"name":"Age_Report","type":"character","width":15},{"name":"Reference","type":"character","width":80},{"name":"Comments","type":"character","width":210}],"n_rows":2311,"rows_kept":2311,"cut":false,"deleted_skipped":0,"read_ended":"whole","bounds":"16MiB/16384/4096/first_that_fit","version":"dbase_level_three","encoding_class":"enc_single_byte","reader":"statdb_count/9"}
["Pegmatite","Brown Derby Mine","Brown Derby Mine",-1.06627284752e+002,3.85414761818e+001,"Gunnison","Parlin","K/Ar","Lepidolite",1352.000000,"53","1460 ± 58","Aldrich and others (1956)","Location approximate.  Some microlite in sample."]
["Pegmatite","Brown Derby Mine","Brown Derby Mine",-1.06627284752e+002,3.85414761818e+001,"Gunnison","Parlin","K/Ar","Lepidolite",1295.000000,"53","1400 ± 56","Aldrich and others (1956)","Location approximate."]
["Pegmatite","Brown Derby Mine","Brown Derby Mine",-1.06627284752e+002,3.85414761818e+001,"Gunnison","Parlin","K/Ar","Lepidolite",1276.000000,"53","1380 ± 55","Aldrich and others (1956)","Location approximate."]
["Pegmatite","Brown Derby Mine","Brown Derby Mine",-1.06627284752e+002,3.85414761818e+001,"Gunnison","Parlin","K/Ar","Lepidolite",1314.000000,"53","1420 ± 57","Aldrich and others (1956)","Location approximate."]
["Granite","Henry Mountain pluton","Granite A",-1.06650367608e+002,3.85409413613e+001,"Gunnison","Parlin","U-Pb","Zircon",1530.000000,"140","1540 ± 140","Aldrich and others (1956)","Henry Mountain Granite of DeWitt and others (2002); 207Pb/206Pb date.  Apparently same site as B-81-70 of Bickford, Shuster, and Boardman (1989)."]
["Granite","Henry Mountain pluton","Granite B",-1.06636882004e+002,3.84649117057e+001,"Gunnison","Doyleville","K/Ar","Biotite",1276.000000,"53","1380 ± 55","Aldrich and others (1956)","Location approximate."]
["Granite","Henry Mountain pluton","Granite B",-1.06636882004e+002,3.84649117057e+001,"Gunnison","Doyleville","K/Ar","K-feldspar",954.000000,"39","1040 ± 42","Aldrich and others (1956)","Location approximate."]
["Granite","Henry Mountain pluton","Granite B",-1.06636882004e+002,3.84649117057e+001,"Gunnison","Doyleville","U-Pb","Zircon",1690.000000,"60","1700 ± 60","Aldrich and others (1956)","207Pb/206Pb age.  Location approximate."]
["Gneiss","Quartz Creek Granite","Quartz Creek",-1.06650367608e+002,3.85409413613e+001,"Saguache","Houston Gulch","K/Ar","Biotite",1292.000000,"60","1280","Aldrich and others (1958)","Age recalculated by Shaw and others (2005)."]
["Granite","Pikes Peak pluton","Top of Pikes Peak",-1.05043055555e+002,3.88399999997e+001,"Pikes Peak","Pikes Peak","K/Ar","Biotite",989.000000,"Not report","980","Aldrich and others (1958)","Pikes Peak granite.  Biotite partially chloritized."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483323825e+002,3.83485693052e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",520.000000,"2.5","519.5","Alexander and others (1978)","Location approximate."]
["Granodiotite","Kroenke Granodiorite;","BF 176",-1.06333333334e+002,3.89044444441e+001,"Gunnison","Mount Harvard","U-Pb","Sphene",1665.000000,"5","1,665","Fridrich and others (1998)","Map gives age as 1,665 but Reed and others (1987) give it as 1404 Ma. Likely that the 1,665 Ma date is for zircons and Table 1 of the map incorrectly lists the mineral analyzed as sphene."]
["Quartz syenite","Alkaline complex of Democrat Creek",null,-1.05366388889e+002,3.82691666668e+001,"Canon City","Curley Peak","Rb-Sr","Whole-rock",511.000000,"8","511","Armbrustmacher and Hedge (1982)","Isochron age.  Sample locations not given; coordinates mark approximate center of mapped complex for plotting purposes."]
["Syenite","McClure Mountain alkaline complex",null,-1.05466111111e+002,3.83377777781e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",535.000000,"5","535","Armbrustmacher and Hedge (1982)","Isochron. Samples include nepheline syenite and hornblende-biotite syenite.  Locations not given; coordinates mark approximate center of mapped complex for plotting purposes."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483475214e+002,3.83485686811e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",524.000000,"4","524.2","Baadsgaard and others (1988)","Location approximate."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483322240e+002,3.83483308563e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",514.000000,"3.3","514.5","Baksi and others (1996)","Location approximate."]
["Vein material","Sweet Home Mine","SH-2",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","40Ar/39Ar","Sericite",25.500000,"0.1","25.5","Barbá and others (2005)","Plateau age.  Location approximate; estimated from description."]
["Vein material","Sweet Home Mine","SH-3",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","40Ar/39Ar","Sericite",26.100000,"0.1","26.1","Barbá and others (2005)","Plateau age.  Location approximate; estimated from description."]
["Vein material","Sweet Home Mine","SH-4/#1",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","40Ar/39Ar","K-feldspar",25.100000,"0.2","25.1","Barbá and others (2005)","Weighted average of lowest Cl/K fractions.  Integrated [=K-Ar] age is 108.0 ± 0.8.  Location approximate; estimated from description."]
["Vein material","Sweet Home Mine","SH-4/#2",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","40Ar/39Ar","K-feldspar",25.000000,"0.4","25","Barbá and others (2005)","Weighted average of lowest Cl/K fractions.  Integrated [=K-Ar] age is 82.5 ± 1.3.  Location approximate; estimated from description."]
["Vein material","Sweet Home Mine","SH-4/#3",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","40Ar/39Ar","K-feldspar",26.300000,"0.6","26.3","Barbá and others (2005)","Weighted average of lowest Cl/K fractions.  Integrated [=K-Ar] age is 68.9 ± 0.5.  Location approximate; estimated from description."]
["Granodiorite","Kroenke Granodiorite","BF-176a",-1.06330833334e+002,3.89027777774e+001,"Gunnison","Mount Harvard","Rb-Sr","Whole-rock",1670.000000,"100","1700","Barker and others (1974)","Isochron based on 6 samples.  (Sample 1 of 6)  Recalculated date in DeWitt and others (2002)."]
["Granodiorite","Kroenke Granodiorite","BF-301",-1.06413333333e+002,3.89413888890e+001,"Gunnison","Winfield","Rb-Sr","Whole-rock",1670.000000,"100","1700","Barker and others (1974)","Isochron based on 6 samples.  (Sample 2 of 6)  Recalculated date in DeWitt and others (2002).  Location approximate."]
["Granodiorite","Kroenke Granodiorite","BF-302",-1.06337063901e+002,3.88608197049e+001,"Gunnison","Mount Yale","Rb-Sr","Whole-rock",1670.000000,"100","1700","Barker and others (1974)","Isochron based on 6 samples.  (Sample 3 of 6)  Recalculated date in DeWitt and others (2002).  Location approximate."]
["Granodiorite","Kroenke Granodiorite","BF-303",-1.06286407562e+002,3.88761273062e+001,"Gunnison","Mount Yale","Rb-Sr","Whole-rock",1670.000000,"100","1700","Barker and others (1974)","Isochron based on 6 samples.  (Sample 4 of 6)  Recalculated date in DeWitt and others (2002).  Location approximate."]
["Granodiorite","Kroenke Granodiorite","BF-304",-1.06357222223e+002,3.89163888886e+001,"Gunnison","Mount Harvard","Rb-Sr","Whole-rock",1670.000000,"100","1700","Barker and others (1974)","Isochron based on 6 samples.  (Sample 5 of 6)  Recalculated date in DeWitt and others (2002).  Location approximate."]
["Granodiorite","Kroenke Granodiorite","BF-305",-1.06269166666e+002,3.89491666666e+001,"Gunnison","Mount Harvard","Rb-Sr","Whole-rock",1670.000000,"100","1700","Barker and others (1974)","Isochron based on 6 samples.  (Sample 6 of 6)  Recalculated date in DeWitt and others (2002).  Location approximate."]
["Trondhjemite","Palisade Mountain plug","50",-1.05315800000e+002,4.04333000004e+001,"Estes Park","Drake","U-Pb","Zircon",1726.000000,"15",null,"Barovich (1986)","This unpublished age is a common reference in published papers.  Date of Palisade Mountain plug puts maximum age on latest stages of Early Proterozoic deformation."]
["Granodiorite","Pando Porphyry","C-12",-1.06258333333e+002,3.92986111112e+001,"Leadville","Leadville North","FT","Zircon",61.100000,"6.3","61.1","Beaty and others (1987)",null]
["Granodiorite","Pando Porphyry","T-1",-1.06297777778e+002,3.93358333333e+001,"Leadville","Leadville North","FT","Zircon",67.700000,"7.7","67.7","Beaty and others (1987)",null]
["Granodiorite","Pando Porphyry","T-1",-1.06297777778e+002,3.93358333333e+001,"Leadville","Leadville North","FT","Apatite",72.700000,"24","72.7","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-2",-1.06289971018e+002,3.93707146147e+001,"Leadville","Leadville North","FT","Apatite",56.400000,"11.1","56.4","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-3",-1.06250500000e+002,3.93211000004e+001,"Leadville","Leadville North","FT","Zircon",38.700000,"4","38.7","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-3",-1.06250500000e+002,3.93211000004e+001,"Leadville","Leadville North","FT","Apatite",42.100000,"6.8","42.1","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-38",-1.06235833333e+002,3.93788888889e+001,"Leadville","Pando","FT","Apatite",34.900000,"7.1","34.9","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-38",-1.06235833333e+002,3.93788888889e+001,"Leadville","Pando","FT","Zircon",42.100000,"4.3","42.1","Beaty and others (1987)",null]
["Porphyry","Sacramento porphyry","T-39",-1.06209166667e+002,3.93324999998e+001,"Leadville","Leadville North","FT","Apatite",45.200000,"19","45.2","Beaty and others (1987)",null]
["Porphyry","Sacramento porphyry","T-39",-1.06209166667e+002,3.93324999998e+001,"Leadville","Leadville North","FT","Zircon",53.600000,"6","53.6","Beaty and others (1987)",null]
["Granodiorite","Pando Porphyry","T-4",-1.06349828338e+002,3.94880475995e+001,"Leadville","Pando","FT","Apatite",48.600000,"26","48.6","Beaty and others (1987)",null]
["Granodiorite","Pando Porphyry","T-4",-1.06349828771e+002,3.94880699980e+001,"Leadville","Pando","FT","Zircon",53.200000,"6.2","53.2","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-40",-1.06264100000e+002,3.93908000000e+001,"Leadville","Pando","FT","Zircon",39.900000,"3.6","39.9","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-40",-1.06264100000e+002,3.93908000000e+001,"Leadville","Pando","FT","Apatite",40.700000,"7.5","40.7","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-40",-1.06253200000e+002,3.93323999997e+001,"Leadville","Pando","FT","Spene",43.700000,"6.6","43.7","Beaty and others (1987)",null]
["Porphyry","Eagle River Porphyry","T-41",-1.06307871373e+002,3.93820191034e+001,"Leadville","Pando","FT","Zircon",52.900000,"4.8","52.9","Beaty and others (1987)",null]
["Porphyry","Eagle River Porphyry","T-41",-1.06307779236e+002,3.93820201394e+001,"Leadville","Pando","FT","Apatite",54.500000,"17","54.5","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-42",-1.06271666667e+002,3.93458333329e+001,"Leadville","Leadville North","FT","Apatite",42.000000,"7.6","42","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-42",-1.06264100000e+002,3.93908000000e+001,"Leadville","Leadville North","FT","Zircon",43.300000,"4.2","43.3","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-42",-1.06271666667e+002,3.93458333329e+001,"Leadville","Leadville North","FT","Sphene",49.300000,"8","49.3","Beaty and others (1987)",null]
["Syenodiorite","unamed stock near Buckeye Lake","T-43",-1.06250500000e+002,3.93211000004e+001,"Leadville","Leadville North","FT","Apatite",44.200000,"13","44.2","Beaty and others (1987)",null]
["Syenodiorite","unamed stock near Buckeye Lake","T-43",-1.06253333333e+002,3.93324999998e+001,"Leadville","Leadville North","FT","Zircon",48.400000,"4.9","48.4","Beaty and others (1987)",null]
["Syenodiorite","unamed stock near Buckeye Lake","T-43",-1.06253333333e+002,3.93324999998e+001,"Leadville","Leadville North","FT","Sphene",64.700000,"18","64.7","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-44",-1.06249722223e+002,3.93211111115e+001,"Leadville","Leadville North","FT","Apatite",48.300000,"17","48.3","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-44",-1.06249722223e+002,3.93211111115e+001,"Leadville","Leadville North","FT","Zircon",73.600000,"8.2","73.6","Beaty and others (1987)",null]
["Granodiorite porphyry","Lincoln Porphyry","T-5",-1.06271700000e+002,3.93458000004e+001,"Leadville","Leadville North","FT","Zircon",39.500000,"4","39.5","Beaty and others (1987)",null]
["Granodiorite","Pando Porphyry","T-6",-1.06288611111e+002,3.93097222223e+001,"Leadville","Leadville North","FT","Zircon",60.600000,"6.8","60.6","Beaty and others (1987)",null]
["Granodiorite","Pando Porphyry","T-7",-1.06282500000e+002,3.93025000000e+001,"Leadville","Leadville North","FT","Zircon",55.500000,"5.6","55.5","Beaty and others (1987)",null]
["Granite","Granite of Williams Creek (and Bear Creek)","BC-1",-1.05177222222e+002,3.79955555557e+001,"Blanca Peak","Bear Creek","U-Pb","Zircon",1486.000000,"36","1486","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Probably considerable inherited zircons.  Location approximate."]
["Monzogranite","Garell Peak batholith","CO-15",-1.05620833333e+002,3.83919444448e+001,"Canon City","Echo","U-Pb","Zircon",1666.000000,"22","1666","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location given in Reed and others (1987), Supplemental Data 8731."]
["Granite","McCoy Gulch stock","CO-7",-1.05579444444e+002,3.83913888887e+001,"Canon City","Echo","U-Pb","Zircon",1474.000000,"7","1474","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","McCoy Gulch stock","CO-9",-1.05673333333e+002,3.83383333334e+001,"Canon City","Cotopaxi","U-Pb","Zircon",1460.000000,"21","1460","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","San Isabel pluton","LDS-105",-1.05005834368e+002,3.80809012729e+001,"Canon City","Beulah","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample seven of nine.)  Location approximate."]
["Granite","San Isabel pluton","LDS-36",-1.05100555555e+002,3.80752777781e+001,"Canon City","Saint Charles Peak","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample three of nine.)  Location approximate."]
["Granite","San Isabel pluton","LDS-45",-1.05031388889e+002,3.80686111111e+001,"Canon City","Saint Charles Peak","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample five of nine.).   Location approximate."]
["Granite","San Isabel pluton","LDS-67",-1.05072222222e+002,3.80741666667e+001,"Canon City","Saint Charles Peak","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample four of nine.)  Location approximate."]
["Granite","San Isabel pluton","LDS-94",-1.05043611111e+002,3.80769444449e+001,"Canon City","Saint Charles Peak","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample six of nine.)  Location approximate."]
["Leucogranite","Garell Peak batholith","MM-B",-1.05676944445e+002,3.84738888893e+001,"Canon City","Arkansas Mountain","U-Pb","Zircon",1663.000000,"4","1663","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Charnockite","Mount Tyndall Charnockite","MT-2",-1.05285277778e+002,3.82091666664e+001,"Canon City","Mount Tyndall","U-Pb","Zircon",1694.000000,"10","1694","Bickford, Cullers, and others (1989)","Estimated age based on 207Pb/206Pb ages of four nearly concordant fractions.  Could be time of either intrusion or metamorpism. Location approximate."]
["Granite","Granite of Bear Basin","MT-3",-1.05285685794e+002,3.81725830556e+001,"Canon City","Mount Tyndall","U-Pb","Zircon",1359.000000,"11","1359","Bickford, Cullers, and others (1989)","Concordia, upper intercept; lower intercept forced through 99 Ma.  Location approximate."]
["Tonalite","Foliated tonalite of Mount Tyndall area","MT-8",-1.05362500000e+002,3.81805555553e+001,"Canon City","Mount Tyndall","U-Pb","Zircon",1653.000000,"50","1653","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  May be metamorphic age.  Location given in Reed and others (1987)."]
["Tonalite","Tonalitic gneiss of Mount Tyndall area","MT-9A",-1.05351111111e+002,3.81744444445e+001,"Canon City","Mount Tyndall","U-Pb","Zircon",1622.000000,"5","1622","Bickford, Cullers, and others (1989)","Concordia, upper intercept; lower intercept forced through 99 Ma.  May be metamorphic age.  Location given in Reed and others (1987)."]
["Megacrystic granite","Foliated megacrystic granite of Mount Tyndall area","MT-9B",-1.05362500000e+002,3.81805555553e+001,"Canon City","Mount Tyndall","U-Pb","Zircon",1615.000000,"3","1615","Bickford, Cullers, and others (1989)","Concordia, upper intercept; lower intercept forced through 99Ma.  Location given in Reed and others (1987)."]
["Granite","Granitic sill in paragneiss","NOB-1",-1.05114444445e+002,3.81291666668e+001,"Canon City","Wetmore","U-Pb","Zircon",1441.000000,"82","1441","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granodiorite","Crampton Mountain pluton","RG-25",-1.05438888889e+002,3.84755555551e+001,"Canon City","McIntyre Hills","U-Pb","Zircon",1705.000000,"8","1705","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location given in Reed and others (1987), Supplemental Data 8731."]
["Granite","Twin Mountain pluton","RG-4",-1.05307222222e+002,3.85161111107e+001,"Pikes Peak","Rice Mountain [?]","U-Pb","Zircon",1706.000000,"5","1706","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","Oak Creek stock","RG-6",-1.05221650534e+002,3.83114731717e+001,"Canon City","Curley Peak","U-Pb","Zircon",1439.000000,"8","1439","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","Oak Creek stock","RV-1C",-1.05248055556e+002,3.83122222224e+001,"Canon City","Rockvale","U-Pb","Zircon",1442.000000,"7","1442","Bickford, Cullers, and others (1989)","Concordia, upper intercept; lower intercept forced through 99 Ma. Location approximate."]
["Granite","San Isabel pluton","SC-2",-1.05093055556e+002,3.80619444441e+001,"Canon City","Saint Charles Peak","U-Pb","Zircon",1362.000000,"7","1362","Bickford, Cullers, and others (1989)","Concordia, upper intercept. Reported in Thomas and others (1984) as 1,362 ± 3 Ma.  Location approximate."]
["Granite","San Isabel pluton","SD-2",-1.05031111112e+002,3.80236111115e+001,"Canon City","Saint Charles Peak","U-Pb","Zircon",1371.000000,"14","1371","Bickford, Cullers, and others (1989)","Concordia, upper intercept; lower intercept forced through 99 Ma.  Reported in Thomas and others (1984) as 1,356 ± 2 Ma.  Location approximate."]
["Granite","San Isabel pluton","TG-1",-1.05051388889e+002,3.80199999999e+001,"Canon City","Saint Charles Peak","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample one of nine.)  Location approximate."]
["Granite","San Isabel pluton","TG-17",-1.05061666667e+002,3.80008333332e+001,"Canon City","Saint Charles Peak","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample two of nine.)  Location approximate."]
["Granite","San Isabel pluton","TG-70",-1.05055555556e+002,3.79925000003e+001,"Canon City","San Isabel","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample eight of nine.)  Location approximate."]
["Granite","San Isabel pluton","TG-91",-1.05000555556e+002,3.79480555560e+001,"Canon City","San Isabel","Rb-Sr","Whole-rock",1345.000000,"34","1345","Bickford, Cullers, and others (1989)","Isochron based on nine samples.  (Sample nine of nine.) Location approximate."]
["Syenite","McClure Mountain alkaline complex","VS-3",-1.05471111111e+002,3.83583333335e+001,"Canon City","Iron Mountain","U-Pb","Zircon",536.000000,"4","536","Bickford, Cullers, and others (1989)","Concordia, upper intercept; lower intercept forced through 0 Ma.  Location approximate."]
["Granodiorite","Phantom Canyon batholith","VS-6",-1.05101666667e+002,3.85774999997e+001,"Pikes Peak","Phantom Canyon","U-Pb","Zircon",1665.000000,"5","1665","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","Twin Mountain pluton","VS-75",-1.05307222222e+002,3.85161111107e+001,"Pikes Peak","Rice Mountain [?]","U-Pb","Zircon",1703.000000,"7","1703","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","Granite of Cripple Creek, Elevenmile Canyon batholith","VS-8",-1.05367500000e+002,3.88197222224e+001,"Pikes Peak","Wrights Reservoir","U-Pb","Zircon",1423.000000,"28","1423","Bickford, Cullers, and others (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","Granite of Cripple Creek, Elevenmile Canyon batholith","VS-9",-1.05463055556e+002,3.89055555556e+001,"Pikes Peak","Elevenmile Canyon","U-Pb","Zircon",1459.000000,"14","1459","Bickford, Cullers, and others (1989)","Concordia, upper intercept; lower intercept forced through 99 Ma.  Location approximate."]
["Metarhyolite","Rhyolite of Iris Formation (of Afifi)","B-81-13",-1.06761111111e+002,3.84305555555e+001,"Saguache","Iris","U-Pb","Zircon",1740.000000,"8","1740","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987), Supplemental Data 8731."]
["Tonalite","Pluton of Gold Basin","B-81-24",-1.06846111111e+002,3.83888888885e+001,"Saguache","Iris","U-Pb","Zircon",1713.000000,"10","1713","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location approximate."]
["Granite","Granite of South Beaver Creek","B-81-40",-1.06986111111e+002,3.84500000004e+001,"Saguache","Iris NW","U-Pb","Zircon",1721.000000,"7","1721","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987), Supplemental Data 8731."]
["Granite","Unamed granite","B-81-42",-1.06987500000e+002,3.83986111110e+001,"Saguache","Iris NW","U-Pb","Zircon",1700.000000,"7","1700","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987), Supplemental Data 8731."]
["Metarhyolite","Rhyolite of Iris Formation (of Afifi)","B-81-43",-1.06981944444e+002,3.84138888889e+001,"Saguache","Iris NW","U-Pb","Zircon",1730.000000,"7","1730","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987), Supplemental Data 8731."]
["Granite","Granite of Tolvar Peak","B-81-59",-1.07101388889e+002,3.83347222218e+001,"Montrose","Powderhorn","U-Pb","Zircon",1757.000000,"10","1757","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1989), Supplemental Data 8731."]
["Metarhyolite","Rhyolite of Dubois","B-81-60",-1.07097222222e+002,3.83194444447e+001,"Montrose","Powderhorn","U-Pb","Zircon",1766.000000,"14","1766","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1989), Supplemental Data 8731."]
["Granite","Unamed granite","B-81-61",-1.07105833334e+002,3.82533333335e+001,"Montrose","Powderhorn","U-Pb","Zircon",1781.000000,"8","1781","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location approximate; estimated from Montrose 1:250,000 scale geologic map (Tweto and others, 1976)."]
["Granite","Granite of Cochetopa Canyon","B-81-68",-1.06766666667e+002,3.83333333331e+001,"Saguache","Sawtooth Mountain","U-Pb","Zircon",1676.000000,"5","1676","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location approximate and reported in Reed and others (1987), Supplemental Data 8731."]
["Granite","Granite of Wood Gulch","B-81-70",-1.06650000000e+002,3.85666666667e+001,"Gunnison","Parlin","U-Pb","Zircon",1701.000000,"10","1701","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987); coordinates estimated from page-size location map."]
["Granite","Powderhorn Granite","B-81-71",-1.07041666667e+002,3.82763888891e+001,"Montrose","Powderhorn","U-Pb","Zircon",1751.000000,"6","1751","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1989), Supplemental Data 8731, where it is also identified as B-71 and AA-85-43."]
["Metarhyolite","Rhyolite of Dubois","B-81-82",-1.07041388889e+002,3.83263888889e+001,"Montrose","Powderhorn","U-Pb","Zircon",1759.000000,"6","1759","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1989), Supplemental Data 8731."]
["Metarhyolite","Rhyolite of Dubois","B-81-85",-1.07148611111e+002,3.83438888889e+001,"Montrose","Gateview","U-Pb","Zircon",1766.000000,"4","1766","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location approximate; estimated from Montrose 1:250,000 scale geologic map (Tweto and others, 1976)."]
["Metarhyolite","Rhyolite of Dubois","B-82-2",-1.07105833334e+002,3.82963888892e+001,"Montrose","Powderhorn","U-Pb","Zircon",1770.000000,"4","1770","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location approximate; estimated from Montrose 1:250,000 scale geologic map (Tweto and others, 1976)."]
["Metarhyolite","Rhyolite of Iris Formation (of Afifi)","B-83-1",-1.06808333333e+002,3.84930555551e+001,"Saguache","Iris","U-Pb","Zircon",1733.000000,"11","1733","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987), Supplemental Data 8731."]
["Metarhyolite","Ohio City volcanic succesion","B-85-1",-1.06633333333e+002,3.85666666667e+001,"Gunnison","Parlin","U-Pb","Zircon",1745.000000,"16","1745","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987); coordinates estimated from page-size location map."]
["Metarhyolite","Near Ohio City","QCF",-1.06563055556e+002,3.85688888888e+001,"Gunnison","Pitkin","U-Pb","Zircon",1770.000000,"8","1770","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept."]
["Metarhyolite","South of Salida","RC-HO-1",-1.05925886277e+002,3.84148713101e+001,"Canon City","Wellsville","U-Pb","Zircon",1668.000000,"18","1668","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location given in Reed and others (1987), Supplemental Data 8731."]
["Metarhyolite","South of Salida","RC-HO-2",-1.05901388889e+002,3.84208333331e+001,"Canon City","Wellsville","U-Pb","Zircon",1713.000000,"14","1713","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location given in Reed and others (1987), Supplemental Data 8731."]
["Metarhyolite","Rhyolite of Iris Formation (of Afifi)","SAB 79-12",-1.06759722223e+002,3.84388888893e+001,"Saguache","Iris","U-Pb","Zircon",1742.000000,"6","1742","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987), Supplemental Data 8731."]
["Granite","Henry Mountain pluton","SAL-1",-1.05980555556e+002,3.86583333336e+001,"Pikes Peak","Cameron Mountain","U-Pb","Zircon",1672.000000,"5","1672","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location given in Supplemental Data to Reed and others (1987); longitude corrected from 106° to the apparently correct 105°."]
["Metarhyolite","Unamed rhyolite (in Dubois basalt)","SOC-1",-1.07094166667e+002,3.83483333330e+001,"Montrose","Powderhorn","U-Pb","Zircon",1728.000000,"16","1728","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location approximate; estimated from Montrose 1:250,000 scale geologic map (Tweto and others, 1976)."]
["Metarhyolite","Rhyolite of Dubois (?)","SOC-2",-1.07111388889e+002,3.82533333335e+001,"Montrose","Powderhorn","U-Pb","Zircon",1765.000000,"4","1765","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location approximate; estimated from Montrose 1:250,000 scale geologic map (Tweto and others, 1976)."]
["Quartz diorite","Mafic pre-Beaver Creek pluton","T-81-10",-1.06994444445e+002,3.84852777776e+001,"Saguache","Iris NW","U-Pb","Zircon",1730.000000,"6","1730","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location reported in Reed and others (1987), Supplemental Data 8731."]
["Metadacite","Salida metavolcanics","Z-3",-1.05962500000e+002,3.85347222221e+001,"Pikes Peak","Salida East","U-Pb","Zircon",1728.000000,"6","1728","Bickford, Shuster, and Boardman (1989)","Concordia, upper intercept.  Location given in Supplemental Data to Reed and others (1987)."]
["Granodiorite","Buckskin Gulch granodiorite","17",-1.06116666667e+002,3.93250000003e+001,"Leadville","Climax","K/Ar","Biotite",55.900000,"2.5","55.9","Bookstrom (1989)",null]
["Granodiorite porphyry","Buckskin Gulch granodiorite","18",-1.06122707317e+002,3.93291046355e+001,"Leadville","Alma","K/Ar","Biotite",62.400000,"1.9","62.4","Bookstrom (1989)",null]
["Granodiorite","Granodiorite stock",null,-1.06130555555e+002,3.93338888893e+001,"Leadville","Climax","K/Ar","Biotite",42.100000,"1.2","42.1","Bookstrom (1989)",null]
["Biotite rhyolite-B porphyry","Stock southeast of Camp Hale","1323-AB-82-1",-1.06269166666e+002,3.94191666664e+001,"Leadville","Pando","FT","Zircon",35.500000,"3.2","35.5","Bookstrom and others (1987)",null]
["Biotite rhyolite-B porphyry","Stock southeast of Camp Hale","1323-AB-82-1",-1.06269166666e+002,3.94191666664e+001,"Leadville","Pando","K/Ar","Biotite",43.500000,"3","43.5","Bookstrom and others (1987)",null]
["Biotite rhyolite-B porphyry","Stock southeast of Camp Hale","1323-AB-82-1",-1.06269166666e+002,3.94191666664e+001,"Leadville","Pando","K/Ar","Sanidine",40.200000,"2","40.2","Bookstrom and others (1987)",null]
["Sericitized granite-B porphyry","Stock of Silver Mountain (Montezuma)","AB-77G-12A",-1.05816100000e+002,3.95797000004e+001,"Denver West","Montezuma","FT","Zircon",37.400000,"4.3",null,"Bookstrom and others (1987)","Small intrusion interpreted to be cupola of underlying stock."]
["Rhyolite-A porphyry","Montezuma east area","AB-77-G-27A",-1.05802200000e+002,3.95761000000e+001,"Denver West","Montezuma","FT","Zircon",33.300000,"4.3",null,"Bookstrom and others (1987)",null]
["Rhyolite-A porphyry dike","Near Kite Lake","B-5289",-1.06126944444e+002,3.93369444448e+001,"Leadville","Climax","K/Ar","Biotite",63.600000,"2.3","63.6","Bookstrom and others (1987)",null]
["Biotite rhyolite-B porphyry","Rough and Tumbling stock","B-5853",-1.06106944444e+002,3.90358333332e+001,"Leadville","Jones Hill","K/Ar","Biotite",55.900000,"2.1","55.9","Bookstrom and others (1987)",null]
["Rhyolite-A porphyry dike","Near Kite Lake","BU-77-H-100",-1.06129722223e+002,3.93355555552e+001,"Leadville","Climax","FT","Zircon",34.900000,"4","34.9","Bookstrom and others (1987)",null]
["Rhyolite-B porphyry dike","Buckskin Gulch porphyritic dike","BU-77-H-98",-1.06120555556e+002,3.93272222223e+001,"Leadville","Climax","FT","Zircon",26.700000,"4","26.7","Bookstrom and others (1987)","Average of 3 grains."]
["Rhyolite-B porphyry dike","Buckskin Gulch porphyritic dike","BU-77-H-98",-1.06120555556e+002,3.93272222223e+001,"Leadville","Climax","FT","Zircon",35.400000,"3.3","35.4","Bookstrom and others (1987)","Average of 7 grains."]
["Rhyolite-B porphyry dike","Buckskin Gulch porphyritic dike","BU-77-H-98",-1.06120555556e+002,3.93272222223e+001,"Leadville","Climax","FT","Zircon",43.900000,"5.6","43.9","Bookstrom and others (1987)","Average of 4 grains."]
["Granite","Climax, seriate granite stock","Climax 78-1",-1.06163316514e+002,3.93728849458e+001,"Leadville","Climax","FT","Zircon",24.400000,"4.9","24.4 ± 4.9","Bookstrom and others (1987)",null]
["Biotite rhyolite-B porphyry","Otter Mountain plug","DF-1496",-1.05721700000e+002,3.96367000001e+001,"Denver West","Georgetown","FT","Zircon",36.600000,"4.2",null,"Bookstrom and others (1987)","Funnel-shaped neck."]
["Sericitized rhyolite-B porphyry","Paines Mountain plug","DF-1497",-1.05740300000e+002,3.96491999999e+001,"Denver West","Georgetown","FT","Zircon",37.000000,"4",null,"Bookstrom and others (1987)","Central plug of a cluster of plugs and dikes."]
["Rhyolite-B porphyry","Plug at Webster Pass","DF-1498",-1.05836900000e+002,3.95288999997e+001,"Denver West","Montezuma","FT","Zircon",37.500000,"3.7",null,"Bookstrom and others (1987)",null]
["Biotite dacite porphyry","Montezuma, late phase","DF-1499",-1.05834700000e+002,3.95266999999e+001,"Denver West","Montezuma","FT","Zircon",34.800000,"3.7",null,"Bookstrom and others (1987)",null]
["Granite-B porphyry","Montezuma stock","DF-1500",-1.05841100000e+002,3.95867000003e+001,"Denver West","Montezuma","FT","Zircon",39.800000,"4.2",null,"Bookstrom and others (1987)",null]
["Granite-B porphyry","Montezuma stock, southeast margin","DF-1528",-1.05826900000e+002,3.95918999998e+001,"Denver West","Montezuma","FT","Zircon",37.400000,"3",null,"Bookstrom and others (1987)",null]
["Rhyolite-B porphyry","Mad Creek stock, which cuts Empire stock","DF-2692",-1.05696072216e+002,3.97671953714e+001,"Denver West","Empire","FT","Zircon",39.400000,"4.3",null,"Bookstrom and others (1987)",null]
["Explosion breccia","Surrounds Mad Creek stock","DF-2693",-1.05698100000e+002,3.97672000002e+001,"Denver West","Empire","FT","Zircon",40.500000,"6.5",null,"Bookstrom and others (1987)",null]
["Rhyolite-B porphyry","Northwest-trending dike","DF-2695",-1.05731900000e+002,3.96966999996e+001,"Denver West","Georgetown","FT","Zircon",41.500000,"4.8",null,"Bookstrom and others (1987)",null]
["Biotite rhyolite-B porphyry dike","Northeast-trending dike in Montezuma-Silver Plume swarm","DF-2697",-1.05777200000e+002,3.96713999998e+001,"Denver West","Grays Peak","FT","Zircon",42.800000,"4.2",null,"Bookstrom and others (1987)",null]
["Biotite rhyolite-B porphyry","Britannic Mine stock (Montezuma east)","DF-2698",-1.05823900000e+002,3.95710999997e+001,"Denver West","Montezuma","FT","Zircon",39.400000,"3.6",null,"Bookstrom and others (1987)",null]
["Hornblende-biotite dacite porphyry dike","Northwest-trending dike south of Montezuma stock","DF-2699",-1.05835300000e+002,3.95543999997e+001,"Denver West","Montezuma","FT","Zircon",35.500000,"3.7",null,"Bookstrom and others (1987)",null]
["Rhyolite-A porphyry","Radial dike swarm around Red Mountain","DF-2700",-1.05854400000e+002,3.97528000001e+001,"Denver West","Berthoud Pass","FT","Zircon",29.600000,"1.9",null,"Bookstrom and others (1987)",null]
["Granite-A porphyry","Urad stock, Henderson Mine","DF-4829",-1.05844400000e+002,3.97633000003e+001,"Denver West","Berthoud Pass","FT","Zircon",25.100000,"3.1",null,"Bookstrom and others (1987)","7550 level."]
["Granite-A porphyry","Urad stock, Henderson Mine","DF-4830",-1.05843600000e+002,3.97635999997e+001,"Denver West","Berthoud Pass","FT","Zircon",27.200000,"3.1",null,"Bookstrom and others (1987)","8100 level."]
["Granite-A","Urad stock, Henderson Mine","DF-4831",-1.05840300000e+002,3.97588999998e+001,"Denver West","Berthoud Pass","FT","Zircon",20.400000,"3.2",null,"Bookstrom and others (1987)","7500 level."]
["Kersantite","Dike, Henderson  Mine","KA-82-585",-1.05848600000e+002,3.97691999997e+001,"Denver West","Berthoud Pass","FT","Zircon",28.600000,"3.3",null,"Bookstrom and others (1987)","7500 level."]
["Granodiorite","Buckskin biotite granodiorite dike","KL-1-2134",-1.06125822134e+002,3.93251285323e+001,"Leadville","Climax","FT","Zircon",27.600000,"3","27.6","Bookstrom and others (1987)",null]
["Leucorhyolite porphyry","Near contact of Urad stock","70-164",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","Rb-Sr","Whole-rock",28.500000,"1.2",null,"Bookstrom and others (1988)","2700 m altitude in Henderson mine."]
["Leucogranite porphyry","Henderson stock","77-133",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","Rb-Sr","Whole-rock",27.500000,"2",null,"Bookstrom and others (1988)","2150 m altitude in Henderson mine."]
["Kersantite","Composite kersantite-rhyolite dike north of Henderson mine","82-287",-1.05848600000e+002,3.97691999997e+001,"Denver West","Berthoud Pass","Rb-Sr","Whole-rock",26.600000,"3.3",null,"Bookstrom and others (1988)","2275 m altitude in Henderson mine."]
["Leucorhyolite porphyry","Interior of Urad stock","CX122-4820",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","Rb-Sr","Whole-rock",28.500000,"1.2",null,"Bookstrom and others (1988)","2000 m altitude in Henderson mine."]
["Leucogranite","Vasque Porphyry","CX127-3980",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","Rb-Sr","Whole-rock",25.000000,"2",null,"Bookstrom and others (1988)","2100 m altitude in Henderson mine."]
["Leucogranite","Interior of Urad stock","CX165-3265",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","Rb-Sr","Whole-rock",28.500000,"1.2",null,"Bookstrom and others (1988)","2100 m altitude in Henderson mine."]
["Leucogranite","Post-ore Dailey stock","H-480-1046",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","Rb-Sr","Whole-rock",23.800000,"2.3",null,"Bookstrom and others (1988)","2050 m altitude in Henderson mine."]
["Rhyolite porphyry","Mount Cumulus stock, central part",null,-1.05902200000e+002,4.04100000002e+001,"Estes Park","Mount Richthofen","FT","Zircon",28.200000,"0.7",null,"Braddock and Cole (1990); Gamble (1979)",null]
["Granite","Mount Cumulus stock, outer part",null,-1.05875000000e+002,4.03991999997e+001,"Estes Park","Mount Richthofen","FT","Zircon",28.800000,"1.5",null,"Braddock and Cole (1990); Gamble (1979)",null]
["Gabbro","Iron Dike","30-1-9",-1.05760000000e+002,4.04619000004e+001,"Estes Park","Fall River Pass","Rb-Sr","Whole-rock",1316.000000,"50",null,"Braddock and Peterman (1989)","19 point isochron."]
["Gabbro","Iron Dike","30-1-9",-1.05760000000e+002,4.04619000004e+001,"Estes Park","Fall River Pass","Rb-Sr","Granophyre",1316.000000,"50",null,"Braddock and Peterman (1989)","19 point isochron."]
["Gabbro","Iron Dike","30-1-9",-1.05760000000e+002,4.04619000004e+001,"Estes Park","Fall River Pass","Rb-Sr","Plagioclase",1316.000000,"50",null,"Braddock and Peterman (1989)","19 point isochron."]
["Gabbro","Iron Dike","30-1-9",-1.05760000000e+002,4.04619000004e+001,"Estes Park","Fall River Pass","Rb-Sr","Biotite",1316.000000,"50",null,"Braddock and Peterman (1989)","19 point isochron."]
["Tuff","San Luis Valley","Amer 1760-70",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Sanidine",27.700000,"0.16","27.7","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 1760-70",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Biotite",32.700000,"0.4","32.68","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 1820-30",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Sanidine",27.800000,"0.09","27.79","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 1820-30",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Biotite",32.300000,"0.19","32.32","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 1930",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Sanidine",27.800000,"0.11","27.76","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 1930",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Biotite",32.600000,"0.32","32.58","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 2180-2200",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Sanidine",27.800000,"0.19","27.79","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 2180-2200",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Biotite",32.200000,"0.4","32.17","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 2460-70",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Sanidine",28.000000,"0.15","28.03","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 2860-70",-1.05884600000e+002,3.76200000001e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Sanidine",27.800000,"0.28","27.76","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Amer 2860-70",-1.05880000000e+002,3.76299999997e+001,"Blanca Peak","Mount Pleasant School","40Ar/39Ar","Biotite",32.200000,"0.3","32.24","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","Treasure Mountain Tuff (?)","Brister 90-6",-1.05333349094e+002,3.74922647911e+001,"Alamosa","Trinchera Ranch","40Ar/39Ar","Biotite",30.000000,"0.12","29.95","Brister and McIntosh (2004)","Plateau age."]
["Tuff","San Luis Valley","ES 2500-30",-1.05864722223e+002,3.74513888890e+001,"Alamosa","Alamosa East","40Ar/39Ar","Sanidine",23.200000,"0.3","23.21","Brister and McIntosh (2004)","Laser-fustion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains.  Location approximate; probably good to within 1 km."]
["Tuff","Unit correlates with Carpenter Ridge Tuff","ES 2560-90",-1.05864722223e+002,3.74513888890e+001,"Alamosa","Alamosa East","40Ar/39Ar","Sanidine",27.200000,"0.15","27.22","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings.  Location approximate; probably good to within 1 km."]
["Tuff","Probably correlates with Chiquito Peak Tuff","ES 3040-70",-1.05864722223e+002,3.74513888890e+001,"Alamosa","Alamosa East","40Ar/39Ar","Sanidine",28.900000,"0.21","28.91","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; may include detrital grains.  Location approximate; probably good to within 1 km."]
["Tuff","Unit correlates with Gribbles Park Tuff","ES 5500-30",-1.05864722223e+002,3.74513888890e+001,"Alamosa","Alamosa East","40Ar/39Ar","Sanidine",32.900000,"0.11","32.92","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings.  Location approximate; probably good to within 1 km."]
["Tuff","Fish Canyon Tuff","Map 8690-8700",-1.05684000000e+002,3.76707999999e+001,"Blanca Peak","Medano Ranch","40Ar/39Ar","Sanidine",28.000000,"0.15","28","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings."]
["Tuff","Gribbles Park Tuff","Map 9304-50",-1.05684000000e+002,3.76707999999e+001,"Blanca Peak","Medano Ranch","40Ar/39Ar","Sanidine",32.900000,"0.12","32.9","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings."]
["Tuff","Gribbles Park Tuff","Map 9360-70",-1.05684000000e+002,3.76707999999e+001,"Blanca Peak","Medano Ranch","40Ar/39Ar","Sanidine",32.900000,"0.12","32.86","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings."]
["Tuff","Gribbles Park Tuff","Map 9370-80",-1.05684000000e+002,3.76707999999e+001,"Blanca Peak","Medano Ranch","40Ar/39Ar","Sanidine",32.800000,"0.14","32.84","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings."]
["Tuff","Gribbles Park Tuff","Map 9390-9400",-1.05684000000e+002,3.76707999999e+001,"Blanca Peak","Medano Ranch","40Ar/39Ar","Sanidine",33.030000,"0.19","33.03","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings."]
["Tuff","Gribbles Park Tuff","Map 9400-9410",-1.05684000000e+002,3.76707999999e+001,"Blanca Peak","Medano Ranch","40Ar/39Ar","Sanidine",32.800000,"0.13","32.77","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings."]
["Tuff","San Luis Valley","Res 5180-90",-1.05773900000e+002,3.76651999999e+001,"Blanca Peak","Hooper East","40Ar/39Ar","Sanidine",25.100000,"0.09","25.13","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Res 5210-40",-1.05773900000e+002,3.76651999999e+001,"Blanca Peak","Hooper East","40Ar/39Ar","Sanidine",27.900000,"0.14","27.88","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Res 5610-40",-1.05773900000e+002,3.76651999999e+001,"Blanca Peak","Hooper East","40Ar/39Ar","Sanidine",27.400000,"0.58","27.4","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","San Luis Valley","Res 6200-30",-1.05684000000e+002,3.76707999999e+001,"Blanca Peak","Hooper East","40Ar/39Ar","Sanidine",27.900000,"0.39","27.93","Brister and McIntosh (2004)","Laser-fusion weighted-mean age.  Sample from well-cuttings; probably includes detrital grains."]
["Tuff","Carpenter Ridge Tuff","Tenn 2120-40",-1.06172600000e+002,3.77937999996e+001,"Del Norte","La Garita","40Ar/39Ar","Sanidine",27.400000,"0.09","27.37","Brister and McIntosh (2004)","Laser-fusion weighted-mean age of well-cuttings; may have some xenocrysts in sample."]
["Tuff","Fish Canyon Tuff","Tenn 2440-50",-1.06172600000e+002,3.77937999996e+001,"Del Norte","La Garita","40Ar/39Ar","Sanidine",27.800000,"0.09","27.79","Brister and McIntosh (2004)","Laser-fusion weighted-mean age of well-cuttings"]
["Tuff","Lower Treasure Mountain Tuff (?)","Tenn 3460-80",-1.06038400000e+002,3.78054000001e+001,"Del Norte","La Garita","40Ar/39Ar","Biotite",30.200000,"0.23","30.17","Brister and McIntosh (2004)","Laser-fusion weighted-mean age of well-cuttings."]
["Tuff","Carpenter Ridge Tuff","Tuck 3675",-1.06038400000e+002,3.78054000001e+001,"Del Norte","Center North","40Ar/39Ar","Sanidine",27.400000,"0.09","27.44","Brister and McIntosh (2004)","Laser-fusion weighted-mean age of well-cuttings"]
["Tuff","Fish Canyon Tuff","Tuck 3900-05",-1.05990000000e+002,3.89000000001e+001,"Del Norte","Center North","40Ar/39Ar","Sanidine",27.900000,"0.1","27.92","Brister and McIntosh (2004)","Laser-fusion weighted-mean age of well-cuttings"]
["Biotite-hornblende-plagioclase gneiss","Proterozoic gneiss degassed by Eldora stock","EL-24a",-1.05488600000e+002,3.99513999998e+001,"Denver West","Tungsten","K/Ar","Biotite",1029.000000,"35",null,"Brookins and Abashian (1981)","Biotite partly degassed by heat from stock (?)."]
["Biotite-hornblende-plagioclase gneiss","Proterozoic gneiss degassed by Eldora stock","EL-26",-1.05596900000e+002,3.99206000000e+001,"Denver West","Nederland","K/Ar","Biotite",57.900000,"2.2",null,"Brookins and Abashian (1981)","Biotite degassed by heat from Eldora stock."]
["Biotite-hornblende gneiss","Proterozoic gneiss degassed by Eldora stock","EL-27a",-1.05608900000e+002,3.99217000004e+001,"Denver West","Nederland","K/Ar","Biotite",70.100000,"2.7",null,"Brookins and Abashian (1981)","Biotite degassed and K-feldspar partly degassed by heat from Eldora stock."]
["Biotite-hornblende gneiss","Proterozoic gneiss degassed by Eldora stock","EL-27a",-1.05608900000e+002,3.99217000004e+001,"Denver West","Nederland","K/Ar","Biotite",57.900000,"2.2",null,"Brookins and Abashian (1981)","Biotite degassed and K-feldspar partly degassed by heat from Eldora stock."]
["Biotite-hornblende gneiss","Proterozoic gneiss degassed by Eldora stock","EL-28",-1.05606400000e+002,3.99217000004e+001,"Denver West","Nederland","K/Ar","K-feldspar",68.400000,"2.5",null,"Brookins and Abashian (1981)","K-feldspar partly degassed by heat from stock."]
["Biotite-hornblende-pyroxene gneiss","Proterozoic gneiss degassed by Eldora stock","EL-29a",-1.05604400000e+002,3.99206000000e+001,"Denver West","Nederland","K/Ar","K-feldspar",147.000000,"6",null,"Brookins and Abashian (1981)","Biotite and K-feldspar partly degassed by heat from stock."]
["Biotite-hornblende-pyroxene gneiss","Proterozoic gneiss degassed by Eldora stock","EL-29a",-1.05604400000e+002,3.99206000000e+001,"Denver West","Nederland","K/Ar","Biotite",67.000000,"2.5",null,"Brookins and Abashian (1981)","Biotite and K-feldspar partly degassed by heat from stock."]
["Biotite hornblende felsic gneiss","Gneiss cut by apophyses of Eldora stock","EL-3",-1.05586254602e+002,3.99513224701e+001,"Denver West","Nederland","K/Ar","Biotite",59.000000,"2.2",null,"Brookins and Abashian (1981)","Gneiss cut by apophyses of Eldora stock."]
["Pegmatite-bearing felsic gneiss","Proterozoic gneiss degassed by Eldora stock","EL-6B",-1.05587227024e+002,3.99512484802e+001,"Denver West","Nederland","K/Ar","Biotite",58.600000,"2.2",null,"Brookins and Abashian (1981)","Biotite degassed by heat from Eldora stock."]
["Granodiorite","Grottos pluton","D-10",-1.06774444444e+002,3.91997222221e+001,"Leadville","Aspen","FT","Apatite",52.500000,"12.8","52.5","Bryant and Naeser (1980)","Age only approximate."]
["Granodiorite","Grottos pluton","DF-1339",-1.06774444444e+002,3.91997222221e+001,"Leadville","Aspen","FT","Apatite",52.500000,"12.8","52.5","Bryant and Naeser (1980)","Age only approximate."]
["Biotitic migmatite","Metasedimentary gneiss","C-39",-1.06768611111e+002,3.90305555557e+001,"Leadville","Hayden Peak","FT","Apatite",27.900000,"3.9","27.9","Bryant and Naeser (1980)","Annealing age due to uplift."]
["Biotite quartz monzonite","Grottos pluton","DF-1344",-1.06746043487e+002,3.92426067852e+001,"Leadville","Aspen","FT","Apatite",51.100000,"5.5","51.1","Bryant and Naeser (1980)","Annealing age due to uplift."]
["Intrusive rock","Twin Lakes stock","TL-F-6-16",-1.06403055556e+002,3.90705555560e+001,"Leadville","Mount Elbert","FT","Apatite",20.000000,"2.9","20","Bryant and Naeser (1980)","Annealing age due to uplift."]
["Intrusive rock","Monitor Rock plug","73N7",-1.06450833333e+002,3.90730555552e+001,"Leadville","Mount Elbert","FT","Apatite",19.900000,"4.4","19.9","Bryant and Naeser (1980)","Annealing age due to uplift."]
["Intrusive rock","Twin Lakes stock","73N8",-1.06507745218e+002,3.90682386084e+001,"Leadville","Independence Pass","FT","Apatite",29.900000,"4.2","29.9","Bryant and Naeser (1980)","Annealing age due to uplift."]
["Aplite","Dike in Twin Lakes stock","73N9",-1.06399722222e+002,3.90655555557e+001,"Leadville","Mount Elbert","FT","Apatite",16.000000,"2.4","16","Bryant and Naeser (1980)","Annealing age due to uplift."]
["Hornblende-biotite-plagioclase-quartz crystal tuff","Link Springs Tuff Member of the South Park Formation","150",-1.05825600000e+002,3.92575000004e+001,"Bailey","Milligan Lakes","K/Ar","Biotite",59.700000,"2",null,"Bryant and others (1981)",null]
["Hornblende-biotite-plagioclase-quartz crystal tuff","Link Springs Tuff Member of the South Park Formation","150",-1.05825600000e+002,3.92575000004e+001,"Bailey","Milligan Lakes","FT","Zircon",54.700000,"4.8",null,"Bryant and others (1981)",null]
["Pyroxene-bearing hornblende-biotite granodiorite","Plug in Pierre Shale and Williams Range thrust","222",-1.05941900000e+002,3.94924999999e+001,"Bailey","Boreas Pass","K/Ar","Biotite",50.600000,"1.7",null,"Bryant and others (1981)",null]
["Pyroxene-bearing hornblende-biotite granodiorite","Plug in Pierre Shale and Williams Range thrust","222",-1.05941900000e+002,3.94924999999e+001,"Bailey","Boreas Pass","K/Ar","Biotite mixed with hornblende",49.100000,"1.6",null,"Bryant and others (1981)",null]
["Pyroxene-bearing hornblende-biotite granodiorite","Plug in Pierre Shale and Williams Range thrust","222",-1.05941900000e+002,3.94924999999e+001,"Bailey","Boreas Pass","K/Ar","Biotite",45.500000,"1.5",null,"Bryant and others (1981)",null]
["Pyroxene-bearing hornblende-biotite granodiorite","Plug in Pierre Shale and Williams Range thrust","222",-1.05941900000e+002,3.94924999999e+001,"Bailey","Boreas Pass","FT","Zircon",38.300000,"1.8",null,"Bryant and others (1981)",null]
["Pyroxene-bearing hornblende-biotite granodiorite","Plug in Pierre Shale and Williams Range thrust","222",-1.05941900000e+002,3.94924999999e+001,"Bailey","Boreas Pass","FT","Zircon",36.600000,"2",null,"Bryant and others (1981)",null]
["Pyroxene-bearing hornblende-biotite granodiorite","Plug in Pierre Shale and Williams Range thrust","222",-1.05941900000e+002,3.94924999999e+001,"Bailey","Boreas Pass","FT","Zircon",36.200000,"1.6",null,"Bryant and others (1981)",null]
["Porphyritic biotite-hornblende quartz monzonite","Sill (?) in Pierre Shale","223",-1.05963100000e+002,3.95053000000e+001,"Denver West","Keystone","K/Ar","Biotite",44.800000,"1.5",null,"Bryant and others (1981)","Determinations on three biotite separates from same sample."]
["Porphyritic biotite-hornblende quartz monzonite","Sill (?) in Pierre Shale","223",-1.05963100000e+002,3.95053000000e+001,"Denver West","Keystone","K/Ar","Biotite",43.500000,"1.00",null,"Bryant and others (1981)","Determinations on three biotite separates from same sample."]
["Porphyritic biotite-hornblende quartz monzonite","Sill (?) in Pierre Shale","223",-1.05963100000e+002,3.95053000000e+001,"Denver West","Keystone","K/Ar","Biotite",43.100000,"1.00",null,"Bryant and others (1981)","Determinations on three biotite separates from same sample."]
["Porphyritic biotite-hornblende quartz monzonite","Sill (?) in Pierre Shale","223",-1.05963100000e+002,3.95053000000e+001,"Denver West","Keystone","FT","Zircon",35.100000,"3.6",null,"Bryant and others (1981)","Determinations on three biotite separates from same sample."]
["Porphyritic biotite granodiorite","South end of Bald Mountain sill","233",-1.05933132936e+002,3.93599472038e+001,"Bailey","Como","FT","Zircon",35.500000,"1.4",null,"Bryant and others (1981)",null]
["Dacite","Flow near base of South Park Formation","325",-1.05852800000e+002,3.92974999998e+001,"Bailey","Milligan Lakes","FT","Zircon",60.900000,"3.2",null,"Bryant and others (1981)","About 160 m above base of South Park Formation."]
["Porphyritic hornblende-biotite trachydacite","Sill in Benton Group","328",-1.05834400000e+002,3.94219000001e+001,"Bailey","Jefferson","FT","Zircon",37.600000,"1.5",null,"Bryant and others (1981)",null]
["Dacite ash flow tuff","In Antero Formation","420",-1.05727200000e+002,3.93789000001e+001,"Bailey","Mt. Logan","FT","Zircon",36.400000,"1.9",null,"Bryant and others (1981)","Fills paleovalley graded to Elkhorn surface."]
["Dacite flow breccia","Underlies Wall Mountain Tuff","430a",-1.05898600000e+002,3.90132999996e+001,"Bailey","Garo","FT","Zircon",41.500000,"1.8",null,"Bryant and others (1981)",null]
["Dacite flow breccia","Underlies Wall Mountain Tuff","430a",-1.05898600000e+002,3.90132999996e+001,"Bailey","Garo","K/Ar","Biotite",37.800000,"1.3",null,"Bryant and others (1981)",null]
["Felsic crystal tuff","Base of South Park Formation","444",-1.05815300000e+002,3.91493999996e+001,"Bailey","Elkhorn","K/Ar","Biotite",65.500000,"2.2",null,"Bryant and others (1981)",null]
["Felsic crystal tuff","Base of South Park Formation","444",-1.05815300000e+002,3.91493999996e+001,"Bailey","Elkhorn","FT","Zircon",64.100000,"3.7",null,"Bryant and others (1981)",null]
["Brecciated and contact metamorphosed gneiss","Williams Range thrust zone","466",-1.05937200000e+002,3.94919000001e+001,"Bailey","Boreas Pass","FT","Zircon",38.200000,"1.8",null,"Bryant and others (1981)",null]
["Altered porphyritic monzogranite","Probably sill in Pierre Shale","502",-1.05897200000e+002,3.92982999998e+001,"Bailey","Como","FT","Zircon",41.500000,"1.8",null,"Bryant and others (1981)",null]
["Porphyritic hornblende-biotite monzogranite","South end of Bald Mountain sill","503",-1.05926900000e+002,3.93443999997e+001,"Bailey","Como","K/Ar","Biotite",43.200000,"1.5",null,"Bryant and others (1981)",null]
["Porphyritic hornblende-biotite monzogranite","South end of Bald Mountain sill","503",-1.05926900000e+002,3.93443999997e+001,"Bailey","Como","K/Ar","Biotite mixed with minor chlorite and ho",40.700000,"1.4",null,"Bryant and others (1981)",null]
["Porphyritic hornblende-biotite monzogranite","South end of Bald Mountain sill","503",-1.05926900000e+002,3.93443999997e+001,"Bailey","Como","FT","Zircon",40.300000,"1.8",null,"Bryant and others (1981)",null]
["Biotite monzogranite","Mount Guyot plug","74",-1.05928900000e+002,3.94594000002e+001,"Bailey","Boreas Pass","K/Ar","Biotite",44.000000,"1.5",null,"Bryant and others (1981)",null]
["Hornblende-biotite-plagioclase-quartz crystal tuff","About 1600 me above base of South Park Formation","W-1-75",-1.05808600000e+002,3.92303000003e+001,"Bailey","Elkhorn","K/Ar","Biotite",56.300000,"1.9",null,"Bryant and others (1981)","About 1600 m above base of South Park formation."]
["Hornblende-biotite-plagioclase-quartz crystal tuff","About 1600 m above base of South Park Formation","W-1-75",-1.05808600000e+002,3.92303000003e+001,"Bailey","Elkhorn","FT","Zircon",55.500000,"2.7",null,"Bryant and others (1981)","About 1600 m above base of South Park formation."]
["Quartz monzonite","Grottos pluton","AS-1",-1.06769123779e+002,3.91418782680e+001,"Leadville","Aspen","FT","Apatite",31.900000,"15","31.9","Bryant and others (1990)",null]
["Quartz monzonite","Grottos pluton","AS-1",-1.06768922416e+002,3.91418813257e+001,"Leadville","Aspen","FT","Zircon",451.000000,"74","451","Bryant and others (1990)",null]
["Aplite porphyry","Pando Porphyry","AS-10",-1.06800277778e+002,3.91055555560e+001,"Leadville","Hayden Peak","FT","Zircon",48.700000,"5","48.7","Bryant and others (1990)",null]
["Hornblende quartz diorite","Pre-Twin Lakes diorite","AS-11",-1.06818028959e+002,3.91191000724e+001,"Leadville","Aspen","FT","Zircon",53.400000,"5","53.4","Bryant and others (1990)","Uplift age."]
["Quartz porphyry","Little Annie sill","AS-12",-1.06823055556e+002,3.91402777779e+001,"Leadville","Aspen","FT","Zircon",50.000000,"7.2","50","Bryant and others (1990)",null]
["Quartz porphyry","Pando Porphyry","AS-12",-1.06823055556e+002,3.91402777779e+001,"Leadville","Aspen","FT","Apatite",22.300000,"9.2","22.3","Bryant and others (1990)",null]
["Quartz monzonite","Middle Proterozoic rocks","AS-2",-1.06795000000e+002,3.91769444446e+001,"Leadville","Aspen","FT","Zircon",586.000000,"111","586","Bryant and others (1990)",null]
["Quartz monzonite","Grottos pluton","AS-2",-1.06795000000e+002,3.91769444446e+001,"Leadville","Aspen","FT","Apatite",69.800000,"34","69.8","Bryant and others (1990)",null]
["Sandstone","Gothic Formation","AS-3",-1.06839444444e+002,3.92133333333e+001,"Leadville","Aspen","FT","Zircon",852.000000,"28","852","Bryant and others (1990)",null]
["Sandstone","Maroon Formation","AS-4",-1.06826388889e+002,3.91961111114e+001,"Leadville","Aspen","FT","Zircon",648.000000,"186","648","Bryant and others (1990)",null]
["Aplite porphyry","Pando Porphyry","AS-5",-1.06803333334e+002,3.91944444446e+001,"Leadville","Aspen","FT","Zircon",52.100000,"4.4","52.1","Bryant and others (1990)",null]
["Aplite porphyry","Pando Porphyry","AS-6",-1.06803611111e+002,3.91938888885e+001,"Leadville","Aspen","FT","Zircon",58.600000,"6.1","58.6","Bryant and others (1990)",null]
["Aplite porphyry","Pando Porphyry","AS-7",-1.06772222222e+002,3.91947222218e+001,"Leadville","Aspen","FT","Zircon",52.100000,"5","52.1","Bryant and others (1990)",null]
["Aplite porphyry","Pando Porphyry","AS-8",-1.06820555555e+002,3.91797222220e+001,"Leadville","Aspen","FT","Zircon",53.100000,"4.9","53.1","Bryant and others (1990)",null]
["Quartz monzonite","Grottos pluton","AS-9",-1.06829444445e+002,3.91761111113e+001,"Leadville","Aspen","FT","Apatite",28.700000,"5.3","28.7","Bryant and others (1990)","Uplift age."]
["Altered wallrock","Speckle Pay Mine.","Bald Eagle",-1.05534722222e+002,3.97636111108e+001,"Denver West","Central City","40Ar/39Ar","Sericite",61.900000,"1.3","61.9","Caine and others (2006)","Plateau age; sericite ultrasonically separated."]
["Altered wallrock","Speckle Pay Mine.","Speckle Pay",-1.05534444445e+002,3.97327777777e+001,"Denver West","Idaho Springs","40Ar/39Ar","Sericite",65.400000,"1.5","65.4","Caine and others (2006)","Plateau age; sericite separate hand-picked."]
["Altered wallrock","Speckle Pay Mine.","Speckle Pay",-1.05534444445e+002,3.97327777777e+001,"Denver West","Idaho Springs","40Ar/39Ar","Sericite",64.700000,"1.4","64.7","Caine and others (2006)","Weighted-average age; sericite ultrasonically separated."]
["Pegmatite","Brown Derby Mine","Brown Derby Mine",-1.06627284752e+002,3.85414761818e+001,"Gunnison","Parlin","K/Ar","Lepidolite",1439.000000,"60","1360","Carr and Kulp (1957)","Location and recalculated age from Shaw and others (2005)."]
["Pegmatite","Brown Derby Mine","Brown Derby Mine",-1.06627284752e+002,3.85414761818e+001,"Gunnison","Parlin","K/Ar","Feldspar",845.000000,"40","835","Carr and Kulp (1957)","Location from Shaw and others (2005)."]
["Pegmatite","Brown Derby Mine","Brown Derby Mine",-1.06627284752e+002,3.85414761818e+001,"Gunnison","Parlin","K/Ar","Feldspar",866.000000,"40","855","Carr and Kulp (1957)","Location from Shaw and others (2005)."]
["Metagabbro","Buckhorn Creek","BC613-3",-1.05310800000e+002,4.05661000004e+001,"Fort Collins","Buckhorn Mountain","40Ar/39Ar","Hornblende",1534.000000,"2",null,"Cavosie and Selverstone (2003)","Integrated age.  70% of gas yields steps >1600 Ma with older steps >1800 Ma."]
["Mylonite","Buckhorn Creek","BT162",-1.05310300000e+002,4.05671999998e+001,"Fort Collins","Buckhorn Mountain","40Ar/39Ar","Hornblende",1451.000000,"2",null,"Cavosie and Selverstone (2003)","Integrated age. Spectrum suggest Early Proterozoic growth of hornblende followed by partial resetting during ~1.4 Ga mylonitization and/or heating."]
["Whitehorn stock","Whitehorn stock","S2",-1.05897222222e+002,3.85749999996e+001,"Pikes Peak","Salida East","K/Ar","Biotite",66.000000,"1.7","66","Chualaowanich (1996)",null]
["Whitehorn stock","Whitehorn stock","S2",-1.05897222222e+002,3.85749999996e+001,"Pikes Peak","Salida East","K/Ar","Hornblende",73.400000,"2.5","73.4","Chualaowanich (1996)",null]
["Whitehorn stock","Whitehorn stock; satellite body","ss5",-1.05923055555e+002,3.85213888890e+001,"Pikes Peak","Salida East","K/Ar","Biotite",66.100000,"1.7","66.1","Chualaowanich (1996)",null]
["Whitehorn stock","Whitehorn stock; satellite body","ss5",-1.05923055555e+002,3.85213888890e+001,"Pikes Peak","Salida East","K/Ar","Hornblende",85.000000,"2.4","85","Chualaowanich (1996)",null]
["Granite","Henry Mountain pluton","A38G-II",-1.06636882004e+002,3.84649117057e+001,"Saguache","Doyleville","FT","Apatite",54.000000,"13","54 ± 13","Church and Bickford (1971)","Laramide annealing zone.  Location approximate."]
["Granite","Henry Mountain pluton","A38G-II",-1.06636882004e+002,3.84649117057e+001,"Saguache","Doyleville","FT","Apatite",46.000000,"44","46 ± 11","Church and Bickford (1971)","Laramide annealing zone.  Location approximate."]
["Granite","Quartz Monzonite of Cochetopa Creek","CO-74",-1.06765555555e+002,3.83305555558e+001,"Saguache","Sawtooth Mountain","FT","Apatite",300.000000,"30","300 ± 30","Church and Bickford (1971)","Annealing date."]
["Granite","Quartz Monzonite of Cochetopa Creek","CO-74",-1.06765555555e+002,3.83305555558e+001,"Saguache","Sawtooth Mountain","FT","Apatite",160.000000,"16","160 ± 16","Church and Bickford (1971)","Annealing date."]
["Greisen","West Greisen stock","B-11",-1.06259439635e+002,3.86574221828e+001,"Gunnison","Saint Elmo","K/Ar","Muscovite",29.900000,"1.1","29.9","Coolbaugh (1985)","Location estimated from page-size map."]
["Rhyolite porphyry","Browns Creek plug","B-93",-1.06274722222e+002,3.86400000002e+001,"Gunnison","Saint Elmo","K/Ar","Biotite",30.300000,"1.2","30.3","Coolbaugh (1985)","Location estimated from page-size map."]
["Rhyolite ash flow","South of Cameron Pass, Neversummer volcanics","306S",-1.05858300000e+002,4.05000000003e+001,"Fort Collins","Chambers Lake/Fall River Pass","K/Ar","Sanidine",27.700000,"3",null,"Corbett (1968)",null]
["Quartz monzonite","Italian Mountain intrusive","I-368",-1.06753055556e+002,3.89477777779e+001,"Gunnison","Pearl Pass","FT","Zircon",33.900000,"3.9","33.0 ± 1.8","Cunningham and Naeser (1975); Cunningham and others (1994)","Same as sample I-1 of Cunningham and others (1994)."]
["Monzogranite","West Cross Creek stock","D2499B",-1.06537500000e+002,3.94277777773e+001,"Leadville","Mount Jackson","K/Ar","Biotite",61.800000,"1.4","61.8","Cunningham and others (1977)",null]
["Intrusive rock","West Tennessee Creek stock","D2568B",-1.06423611111e+002,3.93466666663e+001,"Leadville","Homestake Reservoir","K/Ar","Biotite",66.400000,"2.2","66.4","Cunningham and others (1977)",null]
["Intrusive rock","Quartz Creek stock","DF-1118",-1.06750555555e+002,3.73944444440e+001,"Antonito","Wolf Creek Pass","FT","Zircon",24.100000,"2.5","24.2 ± 2.5","Cunningham and others (1977)",null]
["Quartz monzonite","Tincup porphyry sill","DF-1150",-1.06509444444e+002,3.86775000004e+001,"Gunnison","Fairview Peak","FT","Zircon",34.400000,"3.2","34.5","Cunningham and others (1977)","Age recalculated by Cunningham and others (1994)."]
["Quartz monzonite","Tincup porphyry sill","DF-1151",-1.06509444444e+002,3.86775000004e+001,"Gunnison","Fairview Peak","FT","Epidote",37.400000,"6.8","37.3","Cunningham and others (1977)","Age recalculated by Cunningham and others (1994)."]
["Monzogranite","West Tennessee Creek stock","DF-1164",-1.06423611111e+002,3.93466666663e+001,"Leadville","Homestake Reservoir","FT","Apatite",46.500000,"10.3","46.4","Cunningham and others (1977)","Age recalculated by Cunningham and others (1994)."]
["Quartz monzonite","Evans Gulch Porphyry","DF-1445",-1.06241111111e+002,3.92550000003e+001,"Leadville","Climax","FT","Zircon",46.800000,"4.4","47","Cunningham and others (1977)","White Cloud mine.  Age recalculated by Cunningham and others (1994)."]
["Granodiorite","East Lake Creek stock","DF-848",-1.06561525517e+002,3.94743740394e+001,"Leadville","Mount Jackson","FT","Sphene",65.200000,"6.3","65.3 ± 5.5","Cunningham and others (1977)","Age recalculated by Cunningham and others (1994)."]
["Granodiorite","East Lake Creek stock","DF-849",-1.06561525517e+002,3.94743740394e+001,"Leadville","Mount Jackson","FT","Zircon",59.500000,"8.1","59.5 ± 7.5","Cunningham and others (1977)","Age recalculated by Cunningham and others (1994)."]
["Monzogranite","West Cross Creek stock","DF-850",-1.06537500000e+002,3.94277777773e+001,"Leadville","Mount Jackson","FT","Zircon",59.200000,"6.9","59.3","Cunningham and others (1977)","Age recalculated by Cunningham and others (1994)."]
["Quartz monzonite","Fulford stock","Fulford-1",-1.06656666667e+002,3.95266666665e+001,"Vail","Fulford","FT","Zircon",65.100000,"6.8","65.3 ± 6.0","Cunningham and others (1977)","Age recalculated by Cunningham and others (1994)."]
["Quartz monzonite","Fulford stock","I-22",-1.06657777778e+002,3.95277777780e+001,"Vail","Fulford","K/Ar","Biotite",62.200000,"1.5","62.2","Cunningham and others (1977)",null]
["Rhyolite porphyry","Porphyry Creek stock","D2569B",-1.06403888889e+002,3.84727777778e+001,"Saguache","Sargents","K/Ar","Biotite",38.400000,"0.9","38.4","Cunningham and others (1977); Cunningham and others (1994)",null]
["Rhyolite porphyry","Porphyry Creek stock","DF-1152",-1.06403888889e+002,3.84727777778e+001,"Saguache","Sargents","FT","Zircon",35.300000,"3.3","35.3","Cunningham and others (1977); Cunningham and others (1994)",null]
["Rhyolite porphyry intrusion","Eureka pipe, Leadville","D2642S",-1.06245833334e+002,3.92508333334e+001,"Leadville","Climax","K/Ar","Sanidine",39.500000,"0.6","38.5","Cunningham and others (1977); Cunningham and others (1994)","Dump of the Big Six mine.  Age recalculated by Bookstrom (1989)."]
["Hornblende-biotite quartz monzonite","Apex stock","A-1",-1.05555000000e+002,3.98675000002e+001,"Denver West","Central City","FT","Zircon",61.700000,"6.3",null,"Cunningham and others (1994)",null]
["Hornblende-biotite quartz monzonite","Dike intruding Apex stock","A-2",-1.05555000000e+002,3.98675000002e+001,"Denver West","Central City","FT","Zircon",58.500000,"5.2",null,"Cunningham and others (1994)",null]
["Biotite-hornblende quartz monzonite","Eldora stock","E-1",-1.05587800000e+002,3.99517000001e+001,"Denver West","Nederland","FT","Zircon",66.600000,"6.4",null,"Cunningham and others (1994)",null]
["Biotite-hornblende quartz monzonite","Eldora stock","E-1",-1.05587800000e+002,3.99517000001e+001,"Denver West","Nederland","FT","Zircon",61.800000,"6.3",null,"Cunningham and others (1994)",null]
["Biotite-sanidine quartz monzonite","Italian Mountain intrusive complex","I-1",-1.06753055556e+002,3.89477777779e+001,"Gunnison","Pearl Pass","FT","Zircon",33.900000,"3.9","33.9","Cunningham and others (1994)","Same as sample I-368 of Cunningham and Naeser (1975)."]
["Biotite-fluorite vein","Cuts granodiorite stock","JS-1",-1.05400000000e+002,4.01166999996e+001,"Estes Park","Gold Hill","K/Ar","Biotite",58.800000,"2",null,"Cunningham and others (1994)",null]
["Sodic granite","Porphyry Mountain stock","JS-2a",-1.05386634943e+002,4.01207657167e+001,"Estes Park","Gold Hill","FT","Zircon",44.800000,"5.7",null,"Cunningham and others (1994)","Vertical drill core 12.5 m depth."]
["Sodic granite","Porphyry Mountain stock","JS-2B",-1.05386636023e+002,4.01209564197e+001,"Estes Park","Gold Hill","FT","Zircon",45.100000,"7.7",null,"Cunningham and others (1994)","Vertical drill core 1024 m depth."]
["Granodiorite","Jamestown stock","JS-3",-1.05391700000e+002,4.01111000004e+001,"Estes Park","Gold Hill","FT","Zircon",48.400000,"7.5",null,"Cunningham and others (1994)",null]
["Porphyry","Johnson Gulch Porphyry","L-3",-1.06222396452e+002,3.92387543045e+001,"Leadville","Climax","FT","Zircon",34.800000,"4.9","34.8","Cunningham and others (1994)",null]
["Porphyritic quartz monzonite","Small stock 5 km south of Montezuma stock","M-1",-1.05825800000e+002,3.95338999999e+001,"Denver West","Montezuma","FT","Zircon",35.000000,"3.2",null,"Cunningham and others (1994)",null]
["Quartz monzonite","Mount Sopris stock","MS-1",-1.07145277778e+002,3.92702777774e+001,"Carbondale","Mount Sopris","FT","Zircon",34.300000,"4.1","34.3","Cunningham and others (1994)",null]
["Quartz monzonite","Mount Sopris stock","MS-1",-1.07145277778e+002,3.92702777774e+001,"Carbondale","Mount Sopris","K/Ar","Biotite",34.200000,"0.8","34.2","Cunningham and others (1994)",null]
["Rhyolite","Round Mountain stock","RM-1",-1.06858888889e+002,3.87738888885e+001,"Gunnison","Cement Mountain","FT","Zircon",11.500000,"1.3","11.5","Cunningham and others (1994)",null]
["Rhyolite","Round Mountain stock","RM-1",-1.06858888889e+002,3.87738888885e+001,"Gunnison","Cement Mountain","FT","Apatite",9.800000,"2.9","9.8","Cunningham and others (1994)",null]
["Rhyolite","Round Mountain stock","RM-1",-1.06858888889e+002,3.87738888885e+001,"Gunnison","Cement Mountain","K/Ar","Biotite",13.900000,"0.3","13.9","Cunningham and others (1994)",null]
["Felsic gneiss/amphibolite","Gore Range",null,-1.06366666667e+002,3.98000000004e+001,"Vail","Mount Powell","Sm-Nd","Whole-rock",1800.000000,"90","1800","DePaolo (1981)","Isochron based on 6 samples.  Location from Wallace (1993, 1995)."]
["Granite","Granite of Taylor River","6-30-82-6",-1.06661388889e+002,3.87616666668e+001,"Gunnison","Matchless Mountain","U-Pb","Zircon",1406.000000,"Not report","1406","DeWitt and others (2002)","207Pb/206Pb date."]
["Latite","Fossil Ridge Latite","7-14-82-3",-1.06707222223e+002,3.86469444444e+001,"Gunnison","Crystal Creek","40Ar/39Ar","Hornblende",69.000000,"1","69","DeWitt and others (2002)","Plateau age."]
["Granite","Henry Mountain pluton","8-12-82-2",-1.06736111111e+002,3.87358333331e+001,"Gunnison","Crystal Creek","U-Pb","Zircon",1693.000000,"Not report","1693","DeWitt and others (2002)","207Pb/206Pb date."]
["Granite","Roosevelt pluton","8-13-82-2",-1.06542777778e+002,3.85786111112e+001,"Gunnison","Pitkin","U-Pb","Zircon",1720.000000,"Not report","1720","DeWitt and others (2002)","207Pb/206Pb date."]
["Granodiorite","Fairview Peak Granodiorite","8-7-82-1",-1.06529444444e+002,3.86775000004e+001,"Gunnison","Fairview","U-Pb","Zircon",1640.000000,"Not report","1640","DeWitt and others (2002)","207Pb/206Pb date."]
["Rhyolite","Gold Creek plug","9-6-83-4",-1.06575395163e+002,3.86417521224e+001,"Gunnison","Fairview","FT","Zircon",34.500000,"3","34.5","DeWitt and others (2002)","Intrusion cooling age"]
["Latite","Fossil Ridge Latite","FR-UM-AND",-1.06613055556e+002,3.88188888890e+001,"Gunnison","Taylor Park Reservoir","40Ar/39Ar","Hornblende",70.300000,"0.7","70.3","DeWitt and others (2002)","Partial plateau age."]
["Latite","Fossil Ridge Latite","FR-UM-AND",-1.06613055556e+002,3.88188888890e+001,"Gunnison","Taylor Park Reservoir","FT","Zircon",56.600000,"6.85","56.6","DeWitt and others (2002)","Regional uplift age"]
["Granite","Granite of Taylor River","X-61962",-1.06599371235e+002,3.86712619134e+001,"Gunnison","Fairview","K/Ar","Muscovite; trace biotite",1326.000000,"44","1326","DeWitt and others (2002)",null]
["Granite","St. Kevin Granite","C-2",-1.06445683558e+002,3.92586773452e+001,"Leadville","Homestake Reservoir","U-Pb","Zircon",1411.000000,"40","1420","Doe and Pearson (1969)","Upper intercept age.  Location and recalculated age by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-3",-1.06475235879e+002,3.92518210795e+001,"Leadville","Homestake Reservoir","U-Pb","Zircon",1411.000000,"40","1420","Doe and Pearson (1969)","Upper intercept age.  Location and recalculated age by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","HWDT",-1.06437500000e+002,3.92833333333e+001,"Leadville","Homestake Reservoir","U-Pb","Zircon",1411.000000,"40","1420","Doe and Pearson (1969)","Upper intercept age.  Location and recalculated age by Wallace (1993, 1995)."]
["Welded ash flow tuff","Wall Mountain Tuff",null,-1.05729200000e+002,3.91333000003e+001,"Bailey","Eagle Rock","K/Ar","Sanidine",41.000000,"1.2",null,"Epis and Chapin (1968); Sawatzky (1967)","Some contamination by Proterozoic basement rock.  2% rock fragments and impurites."]
["Basalt","Flow on South Table Mountain","KA978",-1.05162500000e+002,3.97528000001e+001,"Denver West","Golden","K/Ar","Whole-rock",60.200000,"Not report",null,"Evernden and others (1964)",null]
["Dacitic pumice","Denver Formation","KA992",-1.05162500000e+002,3.97528000001e+001,"Denver West","Golden","K/Ar","Plagioclase",66.400000,"Not report",null,"Evernden and others (1964)",null]
["Pyroxene syenite","Iron Hill alkaline complex","IH14",-1.07038333333e+002,3.82608333330e+001,"Montrose","Powderhorn","Rb-Sr","Whole-rock",1456.000000,"9","1487 ± 9","Fenton and Faure (1970)","Isochron based on 4 samples.  (Sample 2 of 4).  Location approximate; good to 1/4 section."]
["Uncompahgrite","Iron Hill alkaline complex","IH16",-1.07033055556e+002,3.82455555559e+001,"Montrose","Rudolph Hill","Rb-Sr","Whole-rock",1456.000000,"9","1487 ± 9","Fenton and Faure (1970)","Isochron based on 4 samples.  (Sample 1 of 4).  Location approximate; good to 1/16 section."]
["Epidote-quartz rock","Iron Hill alkaline complex","IH18",-1.07093888889e+002,3.83202777781e+001,"Montrose","Powderhorn","Rb-Sr","Whole-rock",1456.000000,"9","1487 ± 9","Fenton and Faure (1970)","Isochron based on 4 samples.  (Sample 4 of 4).  Location approximate; good to 1/16 section."]
["Epidote-quartz rock","Iron Hill alkaline complex","IH18a",-1.07093888889e+002,3.83202777781e+001,"Montrose","Powderhorn","Rb-Sr","Whole-rock",1456.000000,"9","1487 ± 9","Fenton and Faure (1970)","Isochron based on 4 samples.  (Sample 3 of 4).  Location approximate; good to 1/16 section."]
["Hornblende syenite","McClure Mountain alkaline complex","MM-2",-1.05490555556e+002,3.82991666665e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",506.000000,"14","517 ± 14","Fenton and Faure (1970)","Isochron based on 5 samples. (Sample 1 of 5)  Date is 704 ± 70 if altered sample MM-5 is excluded.  Location approximate to nearest quarter section."]
["Shonkinite","McClure Mountain alkaline complex","MM-3",-1.05495833333e+002,3.83244444441e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",506.000000,"14","517 ± 14","Fenton and Faure (1970)","Isochron based on 5 samples.  (Sample 2 of 5)  Date is 704 ± 70 if altered sample MM-5 is excluded.  Location approximate to nearest quarter section."]
["Nepheline syenite","McClure Mountain alkaline complex","MM-4",-1.05484166667e+002,3.83383333334e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",506.000000,"14","517 ± 14","Fenton and Faure (1970)","Isochron based on 5 samples.  (Sample 3 of 5)  Date is 704 ± 70 if altered sample MM-5 is excluded.  Location approximate to nearest quarter section."]
["Cancrinite syenite","McClure Mountain alkaline complex","MM-5",-1.05462776513e+002,3.83643711352e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",506.000000,"14","517 ± 14","Fenton and Faure (1970)","Isochron based on 5 samples.  (Sample 4 of 5)  Date is 704 ± 70 if altered sample MM-5 is excluded.  Location estimated from Fig. 2 in Fenton and Faure (1970)."]
["Carbonatite","McClure Mountain alkaline complex","MM-81",-1.05452777777e+002,3.83461111110e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",506.000000,"14","517 ± 14","Fenton and Faure (1970)","Isochron based on 5 samples.  (Sample 5 of 5)  Date is 704 ± 70 if altered sample MM-5 is excluded.  No location given; latitude/longitufe given only for plotting purposes are very approximate."]
["Rhyolite","Grizzly Peak Tuff near Mount Sopris","(D)-A",-1.07066666667e+002,3.93499999998e+001,"Carbondale","Basalt","K/Ar","Biotite",36.300000,"0.9","36.3","Fridrich and others (1991)",null]
["Rhyolite","Outflow of Grizzly Peak Tuff","AVG-1",-1.06321111111e+002,3.90633333337e+001,"Leadville","Granite","K/Ar","Biotite",33.300000,"1","33.3","Fridrich and others (1991)","Near Twin Lakes dam."]
["Rhyolite","Intracaldera Grizzly Peak Tuff","MA-1",-1.06582777778e+002,3.90847222225e+001,"Leadville","Independence Pass","K/Ar","Biotite",33.400000,"1","33.4","Fridrich and others (1991)","contains rhyolite fiamme."]
["Granite","Drill core from Middle Mountain stock","MM-1",-1.06435777174e+002,3.89738728405e+001,"Gunnison","Winfield","K/Ar","Biotite",37.700000,"1.3","37.8","Ranta (1974), Fridrich and others (1991)",null]
["Rhyolite","Middle Mountain Porphyry","MM-1",-1.06436539413e+002,3.89705689193e+001,"Gunnison","Winfield","K/Ar","Biotite",38.800000,"1.3","38.9","Ranta (1974), Fridrich and others (1991)",null]
["Granodiorite","Pine Creek stock","PC-1",-1.06683333334e+002,3.90333333331e+001,"Leadville","New York Peak","K/Ar","Biotite",35.700000,"1.2","35.7","Fridrich and others (1991)","Sample probably contained excess Ar."]
["Granodiorite","Pine Creek stock","PC-1",-1.06683333334e+002,3.90333333331e+001,"Leadville","New York Peak","K/Ar","Biotite",36.800000,"1.4","36.8","Fridrich and others (1991)","Sample probably contained excess Ar."]
["Rhyolite","Sawmill stock","SAWM-1",-1.06615000000e+002,3.90275000003e+001,"Leadville","Independence Pass","K/Ar","Biotite",32.900000,"1.1","32.9","Fridrich and others (1991)",null]
["Rhyolite","Intracaldera Grizzly Peak Tuff","ZB-2",-1.06576388889e+002,3.90794444441e+001,"Leadville","Independence Pass","K/Ar","Hornblende",33.800000,"1.1","33.8","Fridrich and others (1991)","contains latite fiamme."]
["Granite","St. Kevin Granite","IC-6",-1.06724166666e+002,3.89555555555e+001,"Gunnison","Italian Creek","U-Pb","Zircon",1446.000000,"Not report","1446","Fridrich and others (1998)","Upper intercept; only two points so no uncertainty calculated."]
["Granodiorite","Kroenke Granodiorite","No sample number",-1.06408333333e+002,3.89888888887e+001,"Gunnison","Winfield","U-Pb","Sphene",1645.000000,"5","1645","Fridrich and others (1998)","Date given in text of pamphlet accompanying map of Fridrich and others (1998), but not shown on map or in Table 1."]
["Diorite","Mafic border zone of Twin Lakes pluton","R8-28-84-8",-1.06553333333e+002,3.90050000001e+001,"Leadville","Independence Pass","40Ar/39Ar","Hornblende",63.800000,"1.4","63.82","Fridrich and others (1998)","Weighted average plateau age.  Location from Wallace (1993, 1995)."]
["Granodiorite","Mount Princeton pluton",null,-1.06221666667e+002,3.87188888893e+001,"Gunnison","Mount Antero","Th-Pb","Zircon",36.600000,"0.4","36.6","Fridrich and others (1998)","208Pb/232Th date on single fraction of -400-mesh zircon; identical lower-intercept age given by forcing discordia through data point and upper-intercept of 1,700 Ma.  Location approximate."]
["Granite","Urad Mine porphyry","15",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",28.000000,"0.09","28","Geissman and others (1992)","Disturbed spectum, preferred age."]
["Granite","Urad Mine porphyry","16",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",28.600000,"0.3","28.6","Geissman and others (1992)","Disturbed spectrum, preferred age."]
["Granite","Urad Mine porphyry","17",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",28.300000,"1.4","28.3","Geissman and others (1992)","Plateau age, small sample."]
["Pegmatite","Urad-Henderson in Henderson Granite","18",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",28.100000,"0.2",null,"Geissman and others (1992)","Excess Ar loss to 28.1 Ma"]
["Pegmatite","Urad-Henderson in Henderson Granite","19",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",28.100000,"0.2",null,"Geissman and others (1992)","Plateau age."]
["Pegmatite","Urad-Henderson in Seriate Porphyry","20",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase, altered",27.100000,"0.2",null,"Geissman and others (1992)","Plateau age."]
["Pegmatite","Urad-Henderson in Seriate Porphyry","21",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",27.600000,"0.1",null,"Geissman and others (1992)","Plateau age."]
["Granite","Urad-Henderson, Seriate Porphyry","22",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",28.200000,"0.2",null,"Geissman and others (1992)","Plateau age."]
["Granite","Urad-Henderson, Seriate Porphyry","23",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",27.600000,"0.2",null,"Geissman and others (1992)","Plateau age."]
["Pegmatite","Urad-Henderson in Seriate Porphyry","24",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",27.600000,"0.2",null,"Geissman and others (1992)","Plateau age."]
["Pegmatite","Urad-Henderson in Vasquez Porphyry","25",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",28.700000,"0.08",null,"Geissman and others (1992)","Disturbed spectrum; preferred age."]
["Pegmatite","Urad-Henderson in Vasquez Porphyry","26",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",27.600000,"0.3",null,"Geissman and others (1992)","Plateau age."]
["Magnetite-sericite alteration zone","Urad-Henderson, Seriate Porphyry","27",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Muscovite",26.900000,"0.08",null,"Geissman and others (1992)","Plateau age."]
["Magnetite-sericite alteration zone","Urad-Henderson, Seriate Porphyry","28",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Muscovite",27.500000,"0.03",null,"Geissman and others (1992)","Plateau age."]
["Granite","Urad-Henderson, Vasquez Porphyry","29",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",27.600000,"0.1","27.6","Geissman and others (1992)","Plateau age."]
["Granite","Urad-Henderson, Vasquez Porphyry","30",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",27.800000,"0.1","27.83","Geissman and others (1992)","Plateau age."]
["Granite","Urad-Henderson, border of Ute Porphyry","31",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",28.400000,"0.3",null,"Geissman and others (1992)","Plateau age."]
["Granite","Urad-Henderson, border of Ute Porphyry","32",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",27.600000,"0.2",null,"Geissman and others (1992)","Plateau age."]
["Granite","Urad Mine Porphyry","13, Table 4",-1.05833300000e+002,3.97666999996e+001,"Denver West","Berthoud Pass","FT","Zircon",23.800000,"2.3","23.8","Geissman and others (1992); Naeser and others (1973)",null]
["Granite","Urad Mine Porphyry","11, Table 4",-1.05833300000e+002,3.97666999996e+001,"Denver West","Berthoud Pass","K/Ar","Biotite",33.700000,"2.5","33.7","Geissman and others (1992); Shannon (1982)",null]
["Granite","Urad Mine Porphyry","12, Table 4",-1.05833300000e+002,3.97666999996e+001,"Denver West","Berthoud Pass","K/Ar","Orthoclase",28.500000,"1.2","28.5","Geissman and others (1992); Shannon (1982)",null]
["Granite","Trout Creek Pass area","PUF-24B",-1.05884600000e+002,3.86200000001e+001,"Pikes Peak","Antero Reservoir","K/Ar","Mica",1439.000000,"60","1430","Giffin and Kulp (1960)","Age recalculated by Shaw and others (2005)."]
["Granite","Royal Gorge.","PUF-29B",-1.05323888888e+002,3.84616666667e+001,"Canon City","Royal Gorge","K/Ar","Mica",1546.000000,"60","1540","Giffin and Kulp (1960)","Location approximate."]
["Gneiss","Monarch Pass area","PUF-34B",-1.06324722222e+002,3.84963888886e+001,"Saguache","Pahlone Peak","K/Ar","Mica",1338.000000,"60","1330","Giffin and Kulp (1960)","Location approximate."]
["Gneiss","Arkansas River Canyon area.","PUF-7M",-1.05510555556e+002,3.84558333331e+001,"Canon City","Echo","K/Ar","Mica",1298.000000,"60","1290","Giffin and Kulp (1960)",null]
["Gneiss","Arkansas River Canyon area.","PUF-7M",-1.05510555556e+002,3.84558333331e+001,"Canon City","Echo","K/Ar","Mica",1309.000000,"60","1300","Giffin and Kulp (1960)",null]
["Granite","East end of Arkansas River Canyon","PUF-8B",-1.05407222222e+002,3.84866666662e+001,"Canon City","McIntyre Hills","K/Ar","Mica",1477.000000,"60","1470","Giffin and Kulp (1960)","Location approximate."]
["Granite","Pikes Peak pluton","PUF-9",-1.05042500000e+002,3.88411111112e+001,"Pikes Peak","Pikes Peak","K/Ar","Mica",990.000000,"40","980","Giffin and Kulp (1960)",null]
["Silver Plume Granite","Silver Plume Granite",null,-1.05736700000e+002,3.96972000002e+001,"Denver West","Georgetown","U-Pb","Zircon",1422.000000,"Not report",null,"Graubard and Mattinson (1990)","Preliminary result; final not published."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",522.800000,"2.8","522.8","Harrison (1981)","Location approximate.  Weighted-average date calculated using 3gr as the primary standard."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",513.400000,"4.5","513.4","Harrison (1981)","Location approximate.  Plateau age."]
["Monzonite","Audubon stock",null,-1.05616700000e+002,4.00625000004e+001,"Estes Park","Ward","K/Ar","Biotite",68.000000,"1.1",null,"Hart (1960)","Composite date.  No individual sample locations.  Average of biotite from stock and four samples of country rock from contact zone."]
["Feldspar-quartz-biotite-muscovite pegmatite","South of Barker Reservoir","22500",-1.05485000000e+002,3.99508000000e+001,"Denver West","Tungsten","Rb-Sr","Biotite, coarse",1264.000000,"Not report",null,"Hart (1964)","Regional cooling age."]
["Feldspar-quartz-biotite-muscovite pegmatite","South of Barker Reservoir","22500",-1.05485000000e+002,3.99508000000e+001,"Denver West","Tungsten","K/Ar","Biotite, coarse",1176.000000,"Not report",null,"Hart (1964)","Regional cooling age."]
["Amphibolite included in pegmatite","South of Nederland","9400",-1.05516100000e+002,3.99556000000e+001,"Denver West","Nederland","K/Ar","Hornblende",1375.000000,"Not report",null,"Hart (1964)","Regional cooling age."]
["Quartz monzonite","Eldora stock","BCOA",-1.05586700000e+002,3.99513999998e+001,"Denver West","Nederland","Rb-Sr","Biotite, coarse",62.000000,"9",null,"Hart (1964)",null]
["Quartz monzonite","Eldora stock","BCOA",-1.05586700000e+002,3.99513999998e+001,"Denver West","Nederland","K/Ar","Biotite, coarse",56.200000,"Not report",null,"Hart (1964)",null]
["Quartz monzonite","Eldora stock","BCOA",-1.05586700000e+002,3.99513999998e+001,"Denver West","Nederland","K/Ar","Fine biotite and hornblende",55.100000,"Not report",null,"Hart (1964)",null]
["Granite aplite","Boomer cupola of Redskin stock","Ppb-1K",-1.05448600000e+002,3.90761000004e+001,"Bailey","Tarryall","Rb-Sr","Microcline",930.000000,"50",null,"Hawley and others (1966)",null]
["Granite aplite","Boomer cupola of Redskin stock","Ppb-lm",-1.05448600000e+002,3.90761000004e+001,"Bailey","Tarryall","K/Ar","Muscovite",1005.000000,"Not report",null,"Hawley and others (1966)",null]
["Greisen","Boomer cupola of Redskin stock","Ppb-lmg",-1.05448600000e+002,3.90761000004e+001,"Bailey","Tarryall","K/Ar","Muscovite",1015.000000,"Not report",null,"Hawley and others (1966)",null]
["Porphyritic granite","Porphyritic facies of Redskin stock","Pprs-1K",-1.05416700000e+002,3.91000000004e+001,"Bailey","Tarryall","Rb-Sr","Microcline",896.000000,"50",null,"Hawley and others (1966)",null]
["Greisen","Greisen in Redskin stock","Pprs-lmg",-1.05400000000e+002,3.90833000004e+001,"Bailey","Tarryall","K/Ar","Muscovite",1035.000000,"Not report",null,"Hawley and others (1966)",null]
["Porphyritic granite","Porphyritic facies of Redskin stock","Pps-lb",-1.05416700000e+002,3.91000000004e+001,"Bailey","Tarryall","K/Ar","Biotite",995.000000,"Not report",null,"Hawley and others (1966)",null]
["Hornblende granite","Pikes Peak pluton and Rosalie lobe","1221",-1.05138055555e+002,3.88397222225e+001,"Pikes Peak","Cripple Creek North","Rb-Sr","Whole-rock",1019.000000,"13","1041 ± 13","Hedge (1970)","Isochron based on 13 samples.  Four samples on Colorado Springs and 7 samples on Bailey 1:100,000 quadrangle."]
["Hornblende syenite","Westcreek pluton of Pikes Peak","1222",-1.05164700000e+002,3.91689000001e+001,"Bailey","Westcreek","Rb-Sr","Whole-rock",1023.000000,"Not report",null,"Hedge (1970)",null]
["Biotite granite","Pikes Peak pluton, north","1223A",-1.05263300000e+002,3.92550000003e+001,"Bailey","Green Mountain","Rb-Sr","Whole-rock",1011.000000,"Not report",null,"Hedge (1970)",null]
["Aplite Dike","Pikes Peak pluton, north","1223B",-1.05263300000e+002,3.92550000003e+001,"Bailey","Green Mountain","Rb-Sr","Whole-rock",1032.000000,"Not report",null,"Hedge (1970)",null]
["Porphyritic granite","Pikes Peak pluton, north","PP-2",-1.05125800000e+002,3.93243999996e+001,"Bailey","Deckers","Rb-Sr","Whole-rock",1086.000000,"Not report",null,"Hedge (1970)",null]
["Granite","Pikes Peak pluton and Rosalie lobe","PP-B",-1.05201944445e+002,3.87825000003e+001,"Pikes Peak","Cripple Creek North","Rb-Sr","Whole-rock",1019.000000,"13","1041 ± 13","Hedge (1970)","Isochron based on 13 samples.  Four samples on Colorado Springs and 7 samples on Bailey 1:100,000 quadrangle."]
["Biotite granite","Lone rock pluton of the Pikes Peak batholith","rlg-1",-1.05440300000e+002,3.94508000004e+001,"Bailey","Bailey","Rb-Sr","Whole-rock",1025.000000,"Not report",null,"Hedge (1970)","Formerly called the Rosalie lobe."]
["Biotite granite","Lone rock pluton of the Pikes Peak batholith","rlg-2",-1.05473600000e+002,3.94643999996e+001,"Bailey","Bailey","Rb-Sr","Whole-rock",1039.000000,"Not report",null,"Hedge (1970)","Formerly called the Rosalie lobe."]
["Biotite granite","Lone rock pluton of the Pikes Peak batholith","rlg-3",-1.05487800000e+002,3.94835999997e+001,"Bailey","Bailey","Rb-Sr","Whole-rock",1031.000000,"Not report",null,"Hedge (1970)","Formerly called the Rosalie lobe."]
["Granite","Unamed granite","3.16.1",-1.07105833334e+002,3.82533333335e+001,"Montrose","Powderhorn","U-Pb","Zircon",1735.000000,"9","1735","Hill and Bickford (2001)","SHRIMP 207Pb/206Pb date on rim of zircon.  Same sample as B-81-61 of Bickford, Shuster, and Boardman (1989); suggests TIMS date is too old because of inherited cores.  Location estimated from Montrose 1:250,000"]
["Granite","Unamed granite","3.36.1",-1.07105833334e+002,3.82533333335e+001,"Montrose","Powderhorn","U-Pb","Zircon",1729.000000,"34","1729","Hill and Bickford (2001)","SHRIMP 207Pb/206Pb date on rim of zircon.  Same sample as B-81-61 of Bickford, Shuster, and Boardman (1989); suggests TIMS date is too old because of inherited cores.  Location estimated from Montrose 1:250,000"]
["Granite","Henry Mountain pluton (?)","7.46.2",-1.06650000000e+002,3.85666666667e+001,"Gunnison","Parlin","U-Pb","Zircon",1708.000000,"20","1708","Hill and Bickford (2001)","SHRIMP 207Pb/206Pb date on rim of zircon.  Same sample as B-81.70 of Bickford, Shuster, and Boardman (1989)."]
["Latite","Flagstaff Mountain sill","Flag 28-65",-1.05297200000e+002,4.00030999997e+001,"Estes Park","Boulder","FT","Zircon",64.000000,"3.5",null,"Hoblitt and Larson (1975)",null]
["Potassic basalt","Ralston Reservoir intrusive",null,-1.05240300000e+002,3.98244000001e+001,"Denver West","Golden","K/Ar","Whole-rock",63.500000,"2.5",null,"Hoblitt and Larson (1975)",null]
["Latite","Left Hand Canyon sill",null,-1.05298900000e+002,4.01469000004e+001,"Estes Park","Lyons","FT","Zircon",62.200000,"3",null,"Hoblitt and Larson (1975)",null]
["Latite","Lyons quarry sill",null,-1.05296900000e+002,4.02008000002e+001,"Estes Park","Lyons","FT","Zircon",62.600000,"3",null,"Hoblitt and Larson (1975)",null]
["Biotite-muscovite granite","Kenosha batholith","P-10",-1.05720300000e+002,3.93013999997e+001,"Bailey","Observatory Rock","K/Ar","Biotite",1308.000000,"Not report",null,"Hutchinson (1960)","Cooling age."]
["Hornblende-bearing biotite granite","Outer zone of Pikes Peak pluton","P-4",-1.05257500000e+002,3.94142000004e+001,"Bailey","Pine","K/Ar","Biotite",1060.000000,"Not report",null,"Hutchinson (1960)",null]
["Hornblende-biotite monzogranite","Intermediate zone of Pikes Peak batholith","P-5",-1.05277667848e+002,3.93783446552e+001,"Bailey","Pine","K/Ar","Biotite",1060.000000,"Not report",null,"Hutchinson (1960)",null]
["Hornblende-biotite monzogranite","Granodiorite wedge in outer zone of Pikes Peak batholith","P-9",-1.05359806528e+002,3.93188676277e+001,"Bailey","Green Mountain","K/Ar","Biotite",1060.000000,"Not report",null,"Hutchinson (1960)",null]
["Granodiorite","Boulder Creek Granodiorite",null,-1.06133055555e+002,4.00555555552e+001,"Steamboat Springs","Parshall","Rb-Sr","Whole-rock",1650.000000,"50","1700 ± 50","Izett (1968)","From Byers Canyon.  Rb-Sr model age; analytical data not reported.  Location approximate."]
["Quartz monzonite","Quartz monzonite of Byers Canyon",null,-1.06133055555e+002,4.00555555552e+001,"Steamboat Springs","Parshall","Rb-Sr","Whole-rock",1600.000000,"40","1650 ± 40","Izett (1968)","From Byers Canyon.  Rb-Sr model age; analytical data not reported.  Location approximate."]
["Tuff","Troublesome Formation; Gravel Gulch Tuff","1",-1.06378333333e+002,4.00880555551e+001,"Steamboat Springs","Kremmling","FT","Zircon",11.200000,"1.8","11.2 ± 1.8","Izett (1975)","Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; Gravel Gulch Tuff","1",-1.06378333333e+002,4.00880555551e+001,"Steamboat Springs","Kremmling","FT","Glass",8.300000,"1.2","8.3 ± 1.2","Izett (1975)","Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; Camel Tuff","2",-1.06297440935e+002,4.00322373815e+001,"Steamboat Springs","Junction Butte","FT","Zircon",12.800000,"2","12.8 ± 2.0","Izett (1975)","Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; Camel Tuff","2",-1.06297329572e+002,4.00329060841e+001,"Steamboat Springs","Junction Butte","FT","Glass",10.900000,"1.4","10.9 ± 1.4","Izett (1975)","Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; CW (Chalky White) Tuff","3",-1.06312979619e+002,4.00276241841e+001,"Steamboat Springs","Junction Butte","FT","Zircon",18.000000,"2","18.0 ± 2.0","Izett (1975)","CW (Chalky White) tuff of Izett (1968).  Location aproximate; good to 1/16 section."]
["Tuff","Troublesome Formation; CW (Chalky White) Tuff","3",-1.06312862931e+002,4.00280069095e+001,"Steamboat Springs","Junction Butte","FT","Sphene",20.000000,"2.3","20.0 ± 2.3","Izett (1975)","Location aproximate; good to 1/16 section."]
["Rhyolitic ash","Browns Park Formation; lowest part","4",-1.06800000000e+002,4.01283333335e+001,"Steamboat Springs","Green Ridge","FT","Zircon",23.500000,"2.5","23.5 ± 2.5","Izett (1975)",null]
["Tuff","Troublesome Formation; Camel Tuff","Camel",-1.06295313481e+002,4.00283650195e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Sanidine",15.200000,"0.04","15.2","Izett and Obradovich (2001)","Weighted-mean age of 8 samples (95Z0649; 95Z0650; 97Z0538; 97Z0525; 99Z0253; 99Z0254; 99Z0255; 99Z0256).  Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; CW (Chalky White) Tuff","Chalky White (CW tuff)",-1.06312492757e+002,4.00281064546e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Sanidine",18.900000,"0.22","18.9","Izett and Obradovich (2001)","CW (Chalky White) tuff of Izett (1968).  Sample 94Z0303.  Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; Gravel Gulch Tuff","Gravel Gulch",-1.06381504366e+002,4.00922198739e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Sanidine",11.000000,"0.05","11","Izett and Obradovich (2001)","Izett and Obradovich (2001) report it as a weighted-mean age of 4 sanidine samples but list 3 sanidine (94Z0346; 95Z0246; 98Z0152) and 2 plagioclase (95Z0238; 95Z0239) in data table."]
["Tuff","Troublesome Formation; LTW Tuff","LTW",-1.06305833333e+002,4.00263888889e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Sanidine",17.100000,"0.06","17.1","Izett and Obradovich (2001)","Weighted-mean of four analyses (94Z0325; 94Z0326; 94Z0327; 94Z0328) from two locations.  Barger Gulch site plotted; Horse Gulch site at 40° 05' 00\" N; 106° 21' 59\" W.  Location sites good to 1/16 section."]
["Tuff","Troublesome Formation; Moore Reservoir Tuff","Moore Reservoir",-1.06338611111e+002,4.00030555553e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Sanidine",23.500000,"0.06","23.5","Izett and Obradovich (2001)","Age is weighted-mean of five samples (94Z0310; 94Z0311; 94Z0312; 94Z0313; 94Z0285) from the tuff.  Location approximate; good to 1/4 section."]
["Tuff","Troublesome Formation; Pure White Tuff","Pure White",-1.06306229579e+002,4.00254225647e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Sanidine",18.300000,"0.07","18.3","Izett and Obradovich (2001)","Weighted-mean of two samples (94Z0344; 94Z0345) from tuff.  Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; Road White Tuff","Road White",-1.06331760831e+002,4.00821054841e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Sanidine",15.600000,"0.05","15.6","Izett and Obradovich (2001)","Weighted-mean age of 5 samples (95Z0298; 95Z0299; 95Z0300; 95Z0647; 95Z0648).  Location approximate; good to 1/16 section."]
["Tuff","Troublesome Formation; Spring Tuff","Spring",-1.06290076365e+002,4.00855369004e+001,"Steamboat Springs","Junction Butte","40Ar/39Ar","Plagioclase/sanidine",15.800000,"0.01","15.8","Izett and Obradovich (2001)","Weighted-mean age for two plagioclase (94Z0330; 94Z0317) and one sanidine (98Z0210) sample.  Location approximate; good to 1/16 section."]
["Quartzite","Blue Ridge quartzite","J01-BR1",-1.05297783334e+002,3.85759999998e+001,"Pikes Peak","Rice Mountain","U-Pb","Zircon (detrital)",1770.000000,"20","1770","Jones (2005)","Cited date is the statistical median of 207Pb/206Pb age distribution; range is 1650 - 3180 Ma."]
["Conglomerate","Blue Ridge basal conglomerate","J01-BR2",-1.05297783334e+002,3.85755000002e+001,"Pikes Peak","Rice Mountain","U-Pb","Zircon (detrital)",1710.000000,"20","1710","Jones (2005)","Basal conglomerate.  Cited date is the statistical median of 207Pb/206Pb age distribution; range is 1650 - 1910 Ma."]
["Granodiorite","Twin Mountain pluton","J01-BR3",-1.05304300000e+002,3.85840166670e+001,"Pikes Peak","Rice Mountain","U-Pb","Zircon",1706.000000,"[+5 / -3]","1706","Jones (2005)","Age is upper intercept based on three fractions.  Location from J.V. Jones (written communication, 2006)."]
["Pegmatite","In Five Points Gulch shear zone","J01-FP1",-1.05514879598e+002,3.84530214517e+001,"Canon City","Echo","U-Pb","Zircon",1430.000000,"[+3 / -5]","1430","Jones (2005)","Syn-deformational.  Upper intercept age based on three fractions of mechanically-broken zircon tips; two fractions of zircon cores yielded ages of 1451 and 1449 Ma."]
["Granite","Small body along Hardscabble Creek","J01-RG1",-1.05171750000e+002,3.81750166669e+001,"Canon City","Hardscrabble Mountain","U-Pb","Zircon",1679.000000,"2","1679","Jones (2005)","Upper intercept age based on three fractions of zircons with no recognizable overgrowths.  Two fractions with secondary overgrowths are interpreted by Jones (2005) to indicate metamorphism at 1640."]
["Felsic gneiss","Hardscabble Creek area","J01-RG2",-1.05171750000e+002,3.81750166669e+001,"Canon City","Hardscrabble Mountain","U-Pb","Zircon",1691.000000,"Not report","1691","Jones (2005)","Three fractions yield 207Pb/206Pb ages of 1643, 1659, 1691; Jones (2005) interprets 1691 Ma as the approximate age of basement gneisses in the area."]
["Amphibolite","Hardscabble Creek area","J01-RG3a",-1.05171750000e+002,3.81750166669e+001,"Canon City","Hardscrabble Mountain","U-Pb","Zircon",1680.000000,"Not report","1680","Jones (2005)","Upper intercept of two fractions; interpreted by Jones (2005) to be the time of crystallization of protolith.  He also interprets a single fraction at 1436 Ma to indicate metamorphism."]
["Amphibolite","Hardscabble Creek area","J01-RG3a",-1.05171750000e+002,3.81750166669e+001,"Canon City","Hardscrabble Mountain","U-Pb","Titanite",1390.000000,"7","1390","Jones (2005)","Average of 207Pb/206Pb ages from three fractions; interpreted by Jones (2005) to indicate metamorphic recrystallization of titanite."]
["Amphibolite","Inclusion in granite of Bear Creek","J01-WC1",-1.05167366666e+002,3.79232499998e+001,"Blanca Peak","Bear Creek","U-Pb","Zircon",1436.000000,"2","1436","Jones (2005)","Date is average 207Pb/206Pb age of three fractions; interpreted by Jones (2005) to be a metamorphic age."]
["Gneissic granite","Granite of Bear Creek","J01-WC2",-1.05167366666e+002,3.79232499998e+001,"Blanca Peak","Bear Creek","U-Pb","Zircon",1435.000000,"4","1435","Jones (2005)","Date is average 207Pb/206Pb age of three fractions which overlap concordia; interpreted by Jones (2005) to be age of granite crystallization."]
["Gneissic granite","Granite of Bear Creek","J01-WC2",-1.05167366666e+002,3.79232499998e+001,"Blanca Peak","Bear Creek","U-Pb","Titanite",1375.000000,"2","1375","Jones (2005)","Age is upper intercept based on three fractions; two other fractions give upper intercept of 1362 Ma.  Interpreted by Jones (2005) to indicate metamorphism due to intrusion of the San Isabel granite."]
["Granite","Granite of Bear Creek","J01-WC3",-1.05167366666e+002,3.79232499998e+001,"Blanca Peak","Bear Creek","U-Pb","Zircon",1390.000000,"10","1390","Jones (2005)","Sill.  Age is lower intercept based on three fractions.  Interpreted by Jones (2005) to be age of crystallization of the sill."]
["Pegmatite","In Blue Ridge quartzite","J03-BR4",-1.05300833333e+002,3.85616166669e+001,"Pikes Peak","Rice Mountain","U-Pb","Zircon",1436.000000,"Not report","1436","Jones (2005)","Pegmatite cuts sheared granodiorite and folded quartzite at Blue Ridge.  Inherited Pb makes interpretation difficult."]
["Quartzite","Phantom Canyon quartzite","J03-PC1",-1.05123833333e+002,3.85361166668e+001,"Pikes Peak","Phantom Canyon","U-Pb","Zircon (detrital)",1701.000000,"Not report","1701","Jones (2005)","Date is average of three 207Pb/206Pb ages on fractions of detrital zircons; all fractions are highly discordant (up to 42%)."]
["Quartzite","Phantom Canyon quartzite","J03-PC1",-1.05123833333e+002,3.85361166668e+001,"Pikes Peak","Phantom Canyon","U-Pb","Zircon (detrital)",1700.000000,"10","1700","Jones (2005)","Cited date is the statistical median of 207Pb/206Pb age distribution; range is 1520 - 2630 Ma."]
["Quartz diorite","Crampton Mountain pluton","J03-TM1",-1.05421691112e+002,3.84794473092e+001,"Canon City","McIntyre Hills","U-Pb","Titanite",0.000000,"Not report","1404 - 1443","Jones (2005)","Three fractions yield 207Pb/206Pb ages of 1404, 1422, and 1443 Ma.  Jones (2005) interprets these dates to indicate recrystallization during a protracted metamorphic event."]
["Granodiorite","Twin Mountain pluton","K00-BR-25",-1.05297783334e+002,3.85755000002e+001,"Pikes Peak","Rice Mountain","U-Pb","Zircon",1698.000000,"4","1698","Jones (2005)","Date is average of 207Pb/206Pb ages of three fractions; fourth fraction apparently has inherited core.  Location from J.V. Jones (written communication, 2006)."]
["Pegmatite","In Blue Ridge quartzite","K00-BR-26",-1.05300833333e+002,3.85616166669e+001,"Pikes Peak","Rice Mountain","U-Pb","Zircon",1436.000000,"Not report","1436","Jones (2005)","Pegmatite cuts sheared granodiorite and folded quartzite at Blue Ridge.  Inherited Pb makes interpretation difficult."]
["Monzogranite","Marshall Gulch monzogranite","J01-MG1",-1.05727217791e+002,3.80481536654e+001,"Canon City","Rito Alto Peak","U-Pb","Zircon",1695.000000,"2","1695","Jones (2005); Jones and Connelly (2006)","Date is average 207Pb/206Pb age of two concordant fractions."]
["Monzogranite","Marshall Gulch monzogranite","J01-MG1",-1.05726916268e+002,3.80481555306e+001,"Canon City","Rito Alto Peak","U-Pb","Titanite",1637.000000,"6","1637","Jones (2005); Jones and Connelly (2006)","238U/204Pb-206Pb/204Pb isochron age based on three points.  Jones (2005) interprets date as time of metamorphic recrystallization."]
["Tonalite","Small stock in Crestone pluton","J01-MG2",-1.05733600000e+002,3.80475999996e+001,"Canon City","Rito Alto Peak","U-Pb","Zircon",1693.000000,"2","1693","Jones (2005); Jones and Connelly (2006)","Xenolith in Marshall Gulch pluton.  Upper intercept age based on three (of five) fractions."]
["Pegmatite","Intrudes tonalite stock in Crestone pluton","J01-MG3",-1.05737866667e+002,3.80466000003e+001,"Canon City","Rito Alto Peak","U-Pb","Zircon",1407.000000,"6","1407","Jones (2005); Jones and Connelly (2006)","Pegmatite cuts Marshall Gulch pluton.  Upper intercept age based on three (of four) fractions."]
["Quartz monzonite","Music Pass pluton","J01-MP1",-1.05501683333e+002,3.79225000003e+001,"Blanca Peak","Crestone Peak","U-Pb","Zircon",1434.000000,"2","1434","Jones (2005); Jones and Connelly (2006)","Upper intercept age based on four fractions."]
["Quartz monzonite","Music Pass pluton","J01-MP1",-1.05501683333e+002,3.79225000003e+001,"Blanca Peak","Crestone Peak","U-Pb","Titanite",1412.000000,"4","1412","Jones (2005); Jones and Connelly (2006)","Upper intercept age based on three fractions; interpreted by Jones (2005) to be the age of metamorphic recrystallization."]
["Pegmatite","Intrudes Music Mountain pluton","J01-MP2",-1.05501683333e+002,3.79225000003e+001,"Blanca Peak","Crestone Peak","U-Pb","Zircon",1434.000000,"Not report","1434","Jones (2005); Jones and Connelly (2006)","Pegmatite cuts foliation in Music Pass quartz monzonite.  Age is estimate based on 207Pb/206Pb dates for two (of four) fractions, one of which overlaps concordia at 1434 Ma."]
["Quartz monzonite","Crestone quartz monzonite","J01-RA60",-1.05678666667e+002,3.80027666669e+001,"Canon City","Rito Alto Peak","U-Pb","Zircon",1682.000000,"3","1682","Jones (2005); Jones and Connelly (2006)","Upper intercept age based on four (of four) fractions."]
["Quartz monzonite","Crestone quartz monzonite","J01-RA60",-1.05678666667e+002,3.80027666669e+001,"Canon City","Rito Alto Peak","U-Pb","Titanite",1420.000000,"4","1420","Jones (2005); Jones and Connelly (2006)","Upper intercept age based on three (of four) fractions; interpreted by Jones (2005) to be the age of metamorphic recrystallization.  The fourth fraction yields a concordant age of 1489 Ma."]
["Amphibolite","Near Crestone pluton","J02-C1",-1.05658116667e+002,3.79919166667e+001,"Blanca Peak","Crestone","U-Pb","Zircon",1760.000000,"Not report","1760","Jones (2005); Jones and Connelly (2006)","Amphibolite in contact aureole of Crestone pluton.  Upper intercept based on two (of seven) fractions. Zircon imaging indicates multiple zones."]
["Granodiorite","Boulder Creek batholith, near Wallstreet","BCG",-1.05380800000e+002,4.00419000004e+001,"Estes Park","Gold Hill","40Ar/39Ar","Hornblende",1414.000000,"4",null,"Kane (1988)","Preferred age."]
["Granodiorite","Boulder Creek batholith, near Wallstreet","BCG",-1.05380800000e+002,4.00419000004e+001,"Estes Park","Gold Hill","40Ar/39Ar","Biotite",1321.000000,"10",null,"Kane (1988)","Preferred age; some Ar loss."]
["Granodiorite","Boulder Creek batholith, near Wallstreet","BCG",-1.05380800000e+002,4.00419000004e+001,"Estes Park","Gold Hill","40Ar/39Ar","Microcline",1110.000000,"10",null,"Kane (1988)","Preferred age, thermally disturbed."]
["Hydrothermal breccia zone","Copper Rock, near Sunset","CPR 4",-1.05439473550e+002,4.00364474910e+001,"Estes Park","Gold Hill","40Ar/39Ar","Adularia",46.000000,"1.00",null,"Kane (1988); Kane and others (1988)","Probably cored by Precambrian feldspar."]
["Pb/Ag vein","Mud vein","Log 19A",-1.05376900000e+002,4.00341999998e+001,"Estes Park","Gold Hill","40Ar/39Ar","Adularia",62.100000,"0.37",null,"Kane (1988); Kane and others (1988)","Plateau age."]
["Alkali syenite","Sugarloaf stock","Tas 2",-1.05417932579e+002,4.00265641641e+001,"Estes Park","Gold Hill","40Ar/39Ar","Hornblende",43.500000,"1.00",null,"Kane (1988); Kane and others (1988)","Total fusion age."]
["Quartz monzonite","Poison Ridge stock","BBD 25",-1.06246666667e+002,4.03183333333e+001,"Steamboat Springs","Parkview Mountain","FT","Zircon",23.900000,"0.5","23.9","Karimpour (1982); Karimpour and Atkinson (1983)","A.O. Complex porphyry copper deposit.  Drill hole sample from 1,350 feet depth."]
["Quartz monzonite","Poison Ridge stock","DDH 105/1000",-1.06246666667e+002,4.03183333333e+001,"Steamboat Springs","Parkview Mountain","FT","Zircon",23.500000,"0.5","23.5","Karimpour (1982); Karimpour and Atkinson (1983)","A.O. Complex porphyry copper deposit.  Drill hole sample from 1,000 feet depth."]
["Quartz monzonite","Poison Ridge stock","DDH 105/1000",-1.06246666667e+002,4.03183333333e+001,"Steamboat Springs","Parkview Mountain","FT","Apatite",24.000000,"0.5","24.04","Karimpour (1982); Karimpour and Atkinson (1983)","A.O. Complex porphyry copper deposit.  Drill hole sample from 1,000 feet depth."]
["Quartz monzonite","Poison Ridge stock","DDH 105/550",-1.06246666667e+002,4.03183333333e+001,"Steamboat Springs","Parkview Mountain","FT","Zircon",23.500000,"0.5","23.5","Karimpour (1982); Karimpour and Atkinson (1983)","A.O. Complex porphyry copper deposit.  Drill hole sample from 550 feet depth."]
["Quartz monzonite","Poison Ridge stock","DDH 105/550",-1.06246666667e+002,4.03183333333e+001,"Steamboat Springs","Parkview Mountain","FT","Zircon",24.000000,"0.5","24","Karimpour (1982); Karimpour and Atkinson (1983)","A.O. Complex porphyry copper deposit.  Drill hole sample from 550 feet depth."]
["Metasedimentary rock","West-central Park Range","97PARK01",-1.06914666667e+002,4.07690000004e+001,"Walden","Hahns Peak","FT","Apatite",53.800000,"5.8","53.8","Kelley (2005)","Track lengths measured."]
["Granite","Buffalo Pass pluton","97PARK02",-1.06688333333e+002,4.03826666665e+001,"Steamboat Springs","Mount Werner","FT","Apatite",69.200000,"5.3","69.2","Kelley (2005)","Track lengths measured."]
["Gneiss","West side of Rabbit Ears Pass","97PARK03",-1.06740833333e+002,4.03691666666e+001,"Steamboat Springs","Walton Peak","FT","Apatite",70.300000,"5.3","70.3","Kelley (2005)","Track lengths measured."]
["Migmatite","West side of Rabbit Ears Pass","97PARK04",-1.06747333333e+002,4.03486666668e+001,"Steamboat Springs","Walton Peak","FT","Apatite",63.800000,"4.7","63.8","Kelley (2005)","Track lengths measured."]
["Granite","West side of Rabbit Ears Pass","97PARK05",-1.06773000000e+002,4.03608333337e+001,"Steamboat Springs","Blacktail Mountain","FT","Apatite",68.900000,"6.7","68.9","Kelley (2005)","Track lengths measured."]
["Granitic gneiss","West side of Rabbit Ears Pass","97PARK07",-1.06790000000e+002,4.03696666662e+001,"Steamboat Springs","Blacktail Mountain","FT","Apatite",63.800000,"6.4","63.8","Kelley (2005)","Track lengths measured."]
["Granite","West side of Rabbit Ears Pass","97PARK08",-1.06798000000e+002,4.03775000003e+001,"Steamboat Springs","Steamboat Springs","FT","Apatite",73.500000,"4.1","73.5","Kelley (2005)","Track lengths measured."]
["Granite","West side of Rabbit Ears Pass","97PARK09",-1.06808333333e+002,4.03873333331e+001,"Steamboat Springs","Steamboat Springs","FT","Apatite",64.100000,"3.7","64.1","Kelley (2005)","Track lengths measured."]
["Gneiss","Buffalo Pass pluton","97PARK10",-1.06719666667e+002,4.05298333332e+001,"Walden","Buffalo Pass","FT","Apatite",69.200000,"5.4","69.2","Kelley (2005)","Track lengths measured."]
["Granite","Mt. Ethel pluton","97PARK12",-1.06697833333e+002,4.05911666666e+001,"Walden","Buffalo Pass","FT","Apatite",55.100000,"7","55.1","Kelley (2005)","Track lengths measured."]
["Gneiss","South-central Park Range","97PARK13",-1.06700333333e+002,4.05583333330e+001,"Walden","Buffalo Pass","FT","Apatite",57.600000,"13.6","57.6","Kelley (2005)","Track lengths measured."]
["Granite","Mt. Ethel pluton","97PARK15",-1.06780833333e+002,4.06503333336e+001,"Walden","Floyd Peak","FT","Apatite",63.200000,"4.8","63.2","Kelley (2005)","Track lengths measured."]
["Granite","Mt. Ethel pluton","97PARK16",-1.06831500000e+002,4.06166666667e+001,"Walden","Rocky Peak","FT","Apatite",46.500000,"3.9","46.5","Kelley (2005)","Track lengths measured."]
["Gneiss","Buffalo Pass pluton","97PARK17",-1.06845000000e+002,4.06041666669e+001,"Walden","Rocky Peak","FT","Apatite",53.800000,"4","53.8","Kelley (2005)","Track lengths measured."]
["Gneiss","North of Steamboat Springs","97PARK18",-1.06880833333e+002,4.05736666666e+001,"Walden","Mad Creek","FT","Apatite",58.900000,"4.2","58.9","Kelley (2005)","Track lengths measured."]
["Gneiss","North of Steamboat Springs","97PARK19",-1.06885333334e+002,4.05676666670e+001,"Walden","Mad Creek","FT","Apatite",60.100000,"3.9","60.1","Kelley (2005)","Track lengths measured."]
["Gneiss","North of Buffalo Mountain, Park Range","97PARK20",-1.06760000000e+002,4.05271666671e+001,"Walden","Rocky Peak","FT","Apatite",54.500000,"4.2","54.5","Kelley (2005)","Track lengths measured."]
["Gneiss","North of Buffalo Mountain, Park Range","97PARK21",-1.06778166666e+002,4.05288333330e+001,"Walden","Rocky Peak","FT","Apatite",64.600000,"5","64.6","Kelley (2005)","Track lengths measured."]
["Gneiss","North of Buffalo Mountain, Park Range","97PARK22",-1.06807833333e+002,4.05258333332e+001,"Walden","Rocky Peak","FT","Apatite",68.800000,"4.7","68.8","Kelley (2005)","Track lengths measured."]
["Gneiss","North of Steamboat Springs","97PARK23",-1.06812833334e+002,4.05148333333e+001,"Walden","Rocky Peak","FT","Apatite",71.000000,"4.8","71","Kelley (2005)","Track lengths measured."]
["Gneiss","Central Park Range","97PARK24",-1.06774833334e+002,4.07698333329e+001,"Walden","Farwell Mountain","FT","Apatite",76.100000,"4.4","76.1","Kelley (2005)","Track lengths measured."]
["Gneiss","Central Park Range","97PARK25",-1.06789333333e+002,4.07648333336e+001,"Walden","Farwell Mountain","FT","Apatite",67.800000,"5.7","67.8","Kelley (2005)","Track lengths measured."]
["Gneiss","Central Park Range","97PARK26",-1.06808000000e+002,4.07583333334e+001,"Walden","Farwell Mountain","FT","Apatite",70.900000,"11.1","70.9","Kelley (2005)","Track lengths measured."]
["Schist","Central Park Range","97PARK27",-1.06846166667e+002,4.07475000004e+001,"Walden","Floyd Peak","FT","Apatite",51.500000,"5.3","51.5","Kelley (2005)","Track lengths measured."]
["Gneiss","Central Park Range","97PARK29",-1.06887666667e+002,4.07256666667e+001,"Walden","Clark","FT","Apatite",50.800000,"4.8","50.8","Kelley (2005)","Track lengths measured."]
["Siltstone","Chugwater Formation","97PARK30",-1.06909166667e+002,4.07395000004e+001,"Walden","Clark","FT","Apatite",66.800000,"5","66.8","Kelley (2005)","Track lengths measured."]
["Granite","Mt. Ethel pluton","98PARK88",-1.06600166667e+002,4.07213333329e+001,"Walden","Pitchpine Mountain","FT","Apatite",54.600000,"4.7","54.6","Kelley (2005)","Track lengths measured."]
["Granite","West of Elevenmile Reservoir","11e",-1.05558666666e+002,3.89341666667e+001,"Pikes Peak","Spinney Mountain","FT","Apatite",94.100000,"7.4","94.1","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","West of Elevenmile Reservoir","11n",-1.05560000000e+002,3.89333333333e+001,"Pikes Peak","Spinney Mountain","FT","Apatite",265.000000,"39","264.7","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","South of Elevenmile Reservoir","11s",-1.05502166666e+002,3.89019999996e+001,"Pikes Peak","Spinney Mountain","FT","Apatite",128.000000,"12.1","127.6","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","92PP03",-1.05052333333e+002,3.86873333331e+001,"Pikes Peak","Farisita","FT","Apatite",124.000000,"11.2","123.6","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","92PP04",-1.05124666667e+002,3.87026666667e+001,"Pikes Peak","Big Bull Mountain","FT","Apatite",26.900000,"2","26.9","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","92PP05",-1.05115833333e+002,3.86539999999e+001,"Pikes Peak","Big Bull Mountain","FT","Apatite",212.000000,"21","211.7","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","92PP06",-1.05133333333e+002,3.86139999996e+001,"Pikes Peak","Cooper Mountain","FT","Apatite",66.200000,"3.9","66.2","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Phantom Canyon pluton","92PP07",-1.05086000000e+002,3.85715000001e+001,"Pikes Peak","Phantom Canyon","FT","Apatite",66.600000,"6.3","66.6","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Phantom Canyon","92PP08",-1.05103666666e+002,3.85486666671e+001,"Pikes Peak","Phantom Canyon","FT","Apatite",56.800000,"8.9","56.8","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Phantom Canyon","92PP09",-1.05124833334e+002,3.85194999998e+001,"Pikes Peak","Phantom Canyon","FT","Apatite",59.700000,"5.5","59.7","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Phantom Canyon","92PP10",-1.05104833333e+002,3.85040000003e+001,"Pikes Peak","Phantom Canyon","FT","Apatite",57.100000,"7.1","57.1","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Oak Creek pluton","92WM01",-1.05233333333e+002,3.83450000004e+001,"Canon City","Rockvale","FT","Apatite",195.000000,"11.8","195.1","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Oak Creek pluton","92WM03",-1.05243333334e+002,3.83316666664e+001,"Canon City","Rockvale","FT","Apatite",299.000000,"20","298.8","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Oak Creek pluton","92WM04",-1.05235000000e+002,3.83299999996e+001,"Canon City","Rockvale","FT","Apatite",290.000000,"14.5","290.2","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Oak Creek pluton","92WM05",-1.05259029359e+002,3.82998898617e+001,"Canon City","Curley Peak","FT","Apatite",80.800000,"21","80.8","Kelley and Chapin (2004)",null]
["Migmatitic gneiss","Mount Tyndall area","92WM07",-1.05345000000e+002,3.82266666664e+001,"Canon City","Mount Tyndall","FT","Apatite",189.000000,"11.4","188.6","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Mount Tyndall area","92WM08",-1.05366666667e+002,3.82050000004e+001,"Canon City","Mount Tyndall","FT","Apatite",141.000000,"10.2","140.6","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Mount Tyndall area","92WM09",-1.05403796819e+002,3.81816765710e+001,"Canon City","Westcliffe","FT","Apatite",181.000000,"11.4","180.8","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","McKenzie Junction","92WM10",-1.05191666667e+002,3.81650000001e+001,"Canon City","Hardscrabble Mountain","FT","Apatite",123.000000,"8.8","123","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Mount Tyndall area","92WM11",-1.05260000000e+002,3.81599999999e+001,"Canon City","Mount Tyndall","FT","Apatite",110.000000,"11.2","109.5","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Hardscabble Creek area","92WM12",-1.05148333333e+002,3.81749999998e+001,"Canon City","Hardscrabble Mountain","FT","Apatite",53.400000,"5.5","53.4","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Hardscabble Creek area","92WM13",-1.05168333333e+002,3.81749999998e+001,"Canon City","Hardscrabble Mountain","FT","Apatite",116.000000,"10.6","115.9","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Deer Peak area","92WM14",-1.05126666666e+002,3.81150000003e+001,"Canon City","Deer Peak","FT","Apatite",138.000000,"11.2","138.4","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Deer Peak area","92WM15",-1.05145000000e+002,3.80983333337e+001,"Canon City","Deer Peak","FT","Apatite",119.000000,"8.6","118.8","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Greenhorn Peaks area","92WM16",-1.05020173347e+002,3.78996428703e+001,"Blanca Peak","San Isabel","FT","Apatite",228.000000,"16.6","228.3","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Granite of Custer Creek","92WM19",-1.05040000000e+002,3.78933333330e+001,"Blanca Peak","San Isabel","FT","Apatite",220.000000,"12.9","219.8","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Greenhorn Peaks area","92WM20",-1.05066666667e+002,3.79333333333e+001,"Blanca Peak","San Isabel","FT","Apatite",187.000000,"13.2","187.4","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Williams Creek pluton","92WM22",-1.05184607968e+002,3.80002338640e+001,"Canon City","Deer Peak","FT","Apatite",211.000000,"12.6","210.7","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Greenhorn Peaks area","92WM24",-1.05013333333e+002,3.79008333334e+001,"Blanca Peak","San Isabel","FT","Apatite",199.000000,"12.9","199.1","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","93GP01",-1.05220500000e+002,3.86538333330e+001,"Pikes Peak","Cripple Creek South","FT","Apatite",111.000000,"6.7","110.9","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","93GP02",-1.05218833334e+002,3.86266666671e+001,"Pikes Peak","Cripple Creek South","FT","Apatite",172.000000,"17.9","172.2","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","93GP03",-1.05198666667e+002,3.86083333337e+001,"Pikes Peak","Cooper Mountain","FT","Apatite",170.000000,"18.5","170.5","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","93GP04B",-1.05204000000e+002,3.86098333336e+001,"Pikes Peak","Cooper Mountain","FT","Apatite",156.000000,"11.6","156.3","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","93GP05",-1.05209333333e+002,3.86108333330e+001,"Pikes Peak","Cooper Mountain","FT","Apatite",194.600000,"17.7","194.6","Kelley and Chapin (2004)",null]
["Granodiorite","Cripple Creek pluton","93GP06",-1.05211666667e+002,3.86141666665e+001,"Pikes Peak","Cooper Mountain","FT","Apatite",66.900000,"4.4","66.9","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Cripple Creek pluton","93GP07",-1.05218840576e+002,3.86085511181e+001,"Pikes Peak","Cooper Mountain","FT","Apatite",63.600000,"4","63.6","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","Royal Gorge.","93RG01",-1.05265744501e+002,3.84339748435e+001,"Canon City","Royal Gorge","FT","Apatite",115.000000,"6.8","115","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","Hardscabble Creek area","93WM29",-1.05129500000e+002,3.81761666668e+001,"Canon City","Hardscrabble Mountain","FT","Apatite",122.000000,"8.3","122.3","Kelley and Chapin (2004)","Track lengths measured."]
["Migmatitic gneiss","San Isabel area","93WM31",-1.05004000000e+002,3.80463333333e+001,"Canon City","Saint Charles Peak","FT","Apatite",31.100000,"3.7","31.1","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Garrell Peak pluton","94ARK01",-1.05737166667e+002,3.83598333334e+001,"Canon City","Cotopaxi","FT","Apatite",77.500000,"4.7","77.5","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Garrell Peak pluton","94ARK03",-1.05683000000e+002,3.83713333329e+001,"Canon City","Cotopaxi","FT","Apatite",54.700000,"4.5","54.7","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","Texas Creek area","94ARK05",-1.05574000000e+002,3.84146666667e+001,"Canon City","Echo","FT","Apatite",74.900000,"6.5","74.9","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Texas Creek area","94ARK06",-1.05539166667e+002,3.84391666665e+001,"Canon City","Echo","FT","Apatite",164.000000,"13.2","164","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","Texas Creek area","94ARK07",-1.05526874232e+002,3.84444059377e+001,"Canon City","Echo","FT","Apatite",91.700000,"9.9","91.7","Kelley and Chapin (2004)","Track lengths measured."]
["Diorite","Crampton Mountain pluton","94ARK08",-1.05406666666e+002,3.84841666670e+001,"Canon City","McIntyre Hills","FT","Apatite",170.000000,"11.3","169.8","Kelley and Chapin (2004)","Track lengths measured."]
["Diorite","Crampton Mountain pluton","94ARK09",-1.05370666667e+002,3.84868333331e+001,"Canon City","Royal Gorge","FT","Apatite",174.000000,"11.9","173.8","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Crampton Mountain pluton","94ARK10",-1.05447000000e+002,3.84718333332e+001,"Canon City","McIntyre Hills","FT","Apatite",171.000000,"15.3","171.3","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","Texas Creek area","94ARK11",-1.05500000000e+002,3.84546666669e+001,"Canon City","Echo","FT","Apatite",134.000000,"11.8","134","Kelley and Chapin (2004)",null]
["Granite","Stoll Mountain pluton","94SPR02",-1.05497000000e+002,3.89310000000e+001,"Pikes Peak","Elevenmile Canyon","FT","Apatite",80.900000,"7.2","80.9","Kelley and Chapin (2004)","Track lengths measured."]
["Pegmatite","Stoll Mountain pluton","94SPR03",-1.05471166666e+002,3.89521666664e+001,"Pikes Peak","Elevenmile Canyon","FT","Apatite",143.000000,"9","143","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","Stoll Mountain pluton","94SPR04",-1.05447833334e+002,3.89740000001e+001,"Pikes Peak","Elevenmile Canyon","FT","Apatite",139.000000,"18","138.7","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","Stoll Mountain pluton","94SPR06",-1.05388833333e+002,3.89891666668e+001,"Pikes Peak","Elevenmile Canyon","FT","Apatite",252.000000,"15.8","252.1","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","West McCoy Gulch stock","95ARK04",-1.05588937562e+002,3.84084503864e+001,"Canon City","Echo","FT","Apatite",75.800000,"7.2","75.8","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Texas Creek area","95ARK07",-1.05520833333e+002,3.84473333334e+001,"Canon City","Echo","FT","Apatite",126.000000,"10","126.2","Kelley and Chapin (2004)","Track lengths measured."]
["Pegmatite","Texas Creek area","95ARK11",-1.05494333333e+002,3.84523333336e+001,"Canon City","McIntyre Hills","FT","Apatite",129.000000,"10.8","128.8","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Garrell Peak pluton","97ARK12",-1.05666333333e+002,3.84366666664e+001,"Canon City","Arkansas Mountain","FT","Apatite",62.500000,"4.6","62.5","Kelley and Chapin (2004)",null]
["Granodiorite","Garrell Peak pluton","97ARK13",-1.05677000000e+002,3.84388333337e+001,"Canon City","Arkansas Mountain","FT","Apatite",62.400000,"4.4","62.4","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Garrell Peak pluton","97ARK17",-1.05762166667e+002,3.84923333330e+001,"Canon City","Howard","FT","Apatite",46.700000,"3.3","46.7","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Garrell Peak pluton","97ARK18",-1.05780693462e+002,3.84966072737e+001,"Canon City","Howard","FT","Apatite",54.900000,"5.1","54.9","Kelley and Chapin (2004)","Track lengths measured."]
["Granodiorite","Garrell Peak pluton","97ARK21",-1.05717381078e+002,3.84332998790e+001,"Canon City","Arkansas Mountain","FT","Apatite",59.000000,"4.3","59","Kelley and Chapin (2004)","Track lengths measured."]
["Arkose","Pennsylvanian arkose","97ARK22",-1.05705043745e+002,3.84307269016e+001,"Canon City","Arkansas Mountain","FT","Apatite",63.900000,"5.2","63.9","Kelley and Chapin (2004)","Track lengths measures."]
["Quartz monzonite","North of Texas Creek","97ARK24",-1.05584500000e+002,3.84570000002e+001,"Canon City","Echo","FT","Apatite",87.900000,"6","87.9","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","North of Texas Creek","97ARK25",-1.05590369388e+002,3.84584225658e+001,"Canon City","Echo","FT","Apatite",212.000000,"12.2","212.1","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","North of Texas Creek","97ARK26",-1.05592333333e+002,3.84528333333e+001,"Canon City","Echo","FT","Apatite",95.900000,"6.3","95.9","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Agate Mountain area","CC-Ft",-1.05777166667e+002,3.88383333329e+001,"Pikes Peak","Agate Mountain","FT","Apatite",97.500000,"15.2","97.5","Kelley and Chapin (2004)",null]
["Granodiorite","Twin Mountain pluton","Egd",-1.05423166667e+002,3.85593333332e+001,"Pikes Peak","Gribble Mountain","FT","Apatite",230.000000,"17.9","230","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","North of Crampton Mountain","Egn",-1.05466500000e+002,3.86149999998e+001,"Pikes Peak","Gribble Mountain","FT","Apatite",200.000000,"16.7","199.7","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","North of Crampton Mountain","EGN2",-1.05475166666e+002,3.86603333332e+001,"Pikes Peak","Cover Mountain","FT","Apatite",84.800000,"5.5","84.8","Kelley and Chapin (2004)","Track lengths measured."]
["Quartz diorite","Crampton Mountain pluton","Eqd",-1.05448067735e+002,3.86212662968e+001,"Pikes Peak","Gribble Mountain","FT","Apatite",60.600000,"7.2","60.6","Kelley and Chapin (2004)","Track lengths measured."]
["Gneiss","North of Crampton Mountain","Wgn",-1.05486500000e+002,3.86229999999e+001,"Pikes Peak","Gribble Mountain","FT","Apatite",184.000000,"16","183.9","Kelley and Chapin (2004)","Track lengths measured."]
["Quartz diorite","Crampton Mountain pluton","Wqd",-1.05449000000e+002,3.86118333332e+001,"Pikes Peak","Gribble Mountain","FT","Apatite",85.400000,"8","85.4","Kelley and Chapin (2004)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP01",-1.06223166667e+002,3.87173333338e+001,"Gunnison","Mount Antero","FT","Apatite",12.300000,"1.5","12.3","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP02",-1.06200666666e+002,3.87420000004e+001,"Gunnison","Mount Antero","FT","Apatite",14.100000,"1.8","14.1","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP03",-1.06192833333e+002,3.87421666664e+001,"Gunnison","Mount Antero","FT","Apatite",13.200000,"1.5","13.2","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP04",-1.06186500000e+002,3.87428333329e+001,"Gunnison","Mount Antero","FT","Apatite",9.500000,"0.8","9.5","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP05",-1.06187333333e+002,3.87484999997e+001,"Gunnison","Mount Antero","FT","Apatite",9.600000,"1.2","9.6","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP06",-1.06351500000e+002,3.87425000001e+001,"Gunnison","Saint Elmo","FT","Apatite",22.900000,"2.5","22.9","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP07",-1.06349333333e+002,3.87413333330e+001,"Gunnison","Saint Elmo","FT","Apatite",22.900000,"2.5","22.9","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP08",-1.06346333333e+002,3.87400000000e+001,"Gunnison","Saint Elmo","FT","Apatite",23.100000,"2.8","23.1","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP09",-1.06344166667e+002,3.87189999996e+001,"Gunnison","Saint Elmo","FT","Apatite",17.800000,"1.8","17.8","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP10",-1.06337484390e+002,3.87039566146e+001,"Gunnison","Saint Elmo","FT","Apatite",20.100000,"2.3","20.1","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP11",-1.06300833333e+002,3.87063333330e+001,"Gunnison","Saint Elmo","FT","Apatite",15.300000,"1.9","15.3","Kelley and others (1992)","Track lengths measured."]
["Granite","Mount Princeton pluton","84MP12",-1.06255982504e+002,3.87132533498e+001,"Gunnison","Saint Elmo","FT","Apatite",14.800000,"1.9","14.8","Kelley and others (1992)","Track lengths measured."]
["Gneiss","Medano Peak area","88SG01",-1.05456666667e+002,3.77469999998e+001,"Blanca Peak","Mosca Pass","FT","Apatite",12.800000,"2.3","12.8","Kelley and others (1992)","Track lengths measured."]
["Granite","Pluton of Medano Peak","88SG03",-1.05461166667e+002,3.77306666668e+001,"Blanca Peak","Mosca Pass","FT","Apatite",10.400000,"1.3","10.4","Kelley and others (1992)","Track lengths measured."]
["Metasediment","Minturn Formation","88SG05",-1.05506000000e+002,3.77333333329e+001,"Blanca Peak","Zapata Ranch","FT","Apatite",5.600000,"1.4","5.6","Kelley and others (1992)",null]
["Sandstone","Minturn Formation","88SG06",-1.05164166666e+002,3.72890000000e+001,"Alamosa","Trinchera Peak","FT","Apatite",37.200000,"5.9","37.2","Kelley and others (1992)","Track lengths measured."]
["Sandstone","Minturn Formation","88SG07",-1.05163666667e+002,3.72978333334e+001,"Alamosa","Trinchera Peak","FT","Apatite",31.400000,"4.1","31.4","Kelley and others (1992)","Track lengths measured."]
["Siltstone","Sangre de Cristo Formation","88SG08",-1.05127500000e+002,3.73183333332e+001,"Alamosa","Trinchera Peak","FT","Apatite",18.600000,"2.5","18.6","Kelley and others (1992)","Track lengths measured."]
["Siltstone","Sangre de Cristo Formation","88SG09",-1.05094833333e+002,3.73320000000e+001,"Alamosa","Cucharas Pass","FT","Apatite",19.400000,"2.3","19.4","Kelley and others (1992)","Track lengths measured."]
["Arkose","Sangre de Cristo Formation","88SG10",-1.05189000000e+002,3.76136666668e+001,"Blanca Peak","La Veta Pass","FT","Apatite",38.900000,"4","38.9","Kelley and others (1992)","Track lengths measured."]
["Sandstone","Minturn Formation","88SG11",-1.05294833333e+002,3.75314999998e+001,"Blanca Peak","Russell","FT","Apatite",28.500000,"2.6","28.5","Kelley and others (1992)","Track lengths measured."]
["Gneiss","La Veta Pass area","88SG12",-1.05341833333e+002,3.74945000003e+001,"Alamosa","Trinchera Ranch","FT","Apatite",22.000000,"2","22","Kelley and others (1992)","Track lengths measured."]
["Gabbro","Gabbro of Little Bear","88SG13",-1.05485166667e+002,3.75773333337e+001,"Blanca Peak","Blanca Peak","FT","Apatite",18.000000,"2","18","Kelley and others (1992)","Track lengths measured."]
["Gneiss","Blanca Peak pluton","88SG14",-1.05511666666e+002,3.75686666663e+001,"Blanca Peak","Twin Peaks","FT","Apatite",20.300000,"3.5","20.3","Kelley and others (1992)",null]
["Granite","Tertiary stock, east of Blanca Peak","88SG16",-1.05556333333e+002,3.75510000003e+001,"Blanca Peak","Twin Peaks","FT","Apatite",16.000000,"2.7","16","Kelley and others (1992)",null]
["Tuff","Central Culebra Range","89SG19",-1.05290500796e+002,3.73132876991e+001,"Alamosa","Ojito Peak","FT","Apatite",29.300000,"3.7","29.3","Kelley and others (1992)","Track lengths measured."]
["Granitic gneiss","Central Culebra Range","89SG20",-1.05279500000e+002,3.72925000004e+001,"Alamosa","Ojito Peak","FT","Apatite",29.300000,"7.1","29.3","Kelley and others (1992)","Track lengths measured."]
["Gneiss","Central Culebra Range","89SG21",-1.05258166667e+002,3.72839999997e+001,"Alamosa","Ojito Peak","FT","Apatite",11.300000,"1.9","11.3","Kelley and others (1992)","Track lengths measured."]
["Pegmatite granite","Central Culebra Range","89SG22",-1.05278500000e+002,3.72480000004e+001,"Alamosa","Taylor Ranch","FT","Apatite",10.600000,"1.5","10.6","Kelley and others (1992)","Track lengths measured."]
["Granitic gneiss","Trinchera Ranch pluton","89SG23",-1.05310666667e+002,3.72373333334e+001,"Alamosa","Taylor Ranch","FT","Apatite",32.500000,"3.9","32.5","Kelley and others (1992)","Track lengths measured."]
["Quartzite","Central Culebra Range","89SG24",-1.05332299713e+002,3.72548133720e+001,"Alamosa","Ojito Peak","FT","Apatite",11.500000,"2.7","11.5","Kelley and others (1992)",null]
["Granitic gneiss","Central Culebra Range","89SG26",-1.05185166667e+002,3.71221666669e+001,"Alamosa","Culebra Peak","FT","Apatite",42.300000,"7.9","42.3","Kelley and others (1992)","Track lengths measured."]
["Granite","Blanca Peak pluton","90SG30",-1.05475333333e+002,3.76031666666e+001,"Blanca Peak","Blanca Peak","FT","Apatite",13.400000,"2.7","13.4","Kelley and others (1992)",null]
["Granite","Blanca Peak pluton","90SG31",-1.05490000000e+002,3.75948333337e+001,"Blanca Peak","Blanca Peak","FT","Apatite",17.500000,"3.7","17.5","Kelley and others (1992)",null]
["Granite","Blanca Peak pluton","90SG32",-1.05482666667e+002,3.75916666671e+001,"Blanca Peak","Blanca Peak","FT","Apatite",12.700000,"3.1","12.7","Kelley and others (1992)",null]
["Basalt","North of Eagle","1ABS13-9-99",-1.06837200000e+002,3.97724999999e+001,"Vail","Castle Peak","40Ar/39Ar","Matrix",23.500000,"0.16","23.49","Kunk and others (2001)","Isochron age.   Preferred age is 22.80 ± 0.12 based on multiple samples from same flow."]
["Basalt","North of Eagle","1CBS13-9-99",-1.06837200000e+002,3.97724999999e+001,"Vail","Castle Peak","40Ar/39Ar","Matrix",22.700000,"0.15","22.68","Kunk and others (2001)","Isochron age.   Preferred age is 22.80 ± 0.12 based on multiple samples from same flow."]
["Basalt","North of Eagle","1DBS13-9-99",-1.06836700000e+002,3.97724999999e+001,"Vail","Castle Peak","40Ar/39Ar","Matrix",22.900000,"0.12","22.91","Kunk and others (2001)","Isochron age.   Preferred age is 22.80 ± 0.12 based on multiple samples from same flow."]
["Basalt","North of Eagle","2ABS13-9-99",-1.06836700000e+002,3.97724999999e+001,"Vail","Castle Peak","40Ar/39Ar","Matrix",22.200000,"0.26","22.25","Kunk and others (2001)","Isochron age.   Preferred age is 22.49 ± 0.23 based on multiple samples from same flow."]
["Basalt","North of Eagle","2BBS13-9-99",-1.06836700000e+002,3.97724999999e+001,"Vail","Castle Peak","40Ar/39Ar","Matrix",22.600000,"0.14","22.59","Kunk and others (2001)","Isochron age.   Preferred age is 22.49 ± 0.23 based on multiple samples from same flow."]
["Basalt","North of Eagle","2CBS13-9-99",-1.06836700000e+002,3.97724999999e+001,"Vail","Castle Peak","40Ar/39Ar","Matrix",22.600000,"0.27","22.62","Kunk and others (2001)","Isochron age.   Preferred age is 22.49 ± 0.23 based on multiple samples from same flow."]
["Basalt","Flattops area","3BBS13-9-99",-1.07127500000e+002,4.00332999997e+001,"Meeker","Devils Causeway","40Ar/39Ar","Matrix",22.600000,"0.41","22.61","Kunk and others (2001)","Isochron age.   Preferred age is 22.58 ± 0.18 based on multiple samples of same flow."]
["Basalt","Flattops area","3CBS13-9-99",-1.07127500000e+002,4.00332999997e+001,"Meeker","Devils Causeway","40Ar/39Ar","Matrix",22.600000,"0.18","22.56","Kunk and others (2001)","Isochron age.   Preferred age is 22.58 ± 0.18 based on multiple samples of same flow."]
["Basalt","Basalt area","Ba36(1)",-1.07055000000e+002,3.93590000001e+001,"Carbondale","Basalt","40Ar/39Ar","Matrix",13.800000,"0.25","13.81","Kunk and others (2001)","Isochron age."]
["Basalt","Basalt area","BR6(3)",-1.07059000000e+002,3.93590000001e+001,"Carbondale","Basalt","40Ar/39Ar","Matrix",13.600000,"0.05","13.57","Kunk and others (2001)","Plateau age."]
["Basalt","Chester Mountain area","C69B",-1.07458888889e+002,3.94588999997e+001,"Carbondale","Center Mountain","40Ar/39Ar","Matrix",10.400000,"0.12","10.38","Kunk and Snee (1998)","Isochron age."]
["Basalt","Carbondale area","CC-132",-1.07288055555e+002,3.94827777775e+001,"Carbondale","Cattle Creek","40Ar/39Ar","Matrix",9.680000,"0.03","9.68","Kunk and Snee (1998)","Plateau age."]
["Basalt","Carbondale area","CC-140",-1.07363888889e+002,3.94133000003e+001,"Carbondale","Cattle Creek","40Ar/39Ar","Matrix",10.100000,"0.26","10.14","Kunk and Snee (1998)","Isochron age."]
["Basalt","Carbondale area","CCLA-5",-1.07281666666e+002,3.94847222223e+001,"Carbondale","Cattle Creek","40Ar/39Ar","Matrix",7.710000,"0.04","7.71","Kunk and Snee (1998)","Plateau age."]
["Basalt","Carbondale area","CD-152",-1.07165833333e+002,3.93827777777e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",13.300000,"0.28","13.29","Kunk and Snee (1998)","Isochron age."]
["Basalt","Carbondale area","GL-100",-1.07270000000e+002,3.95097222218e+001,"Carbondale","Glenwood Springs","40Ar/39Ar","Matrix",22.600000,"1.3","22.04","Kunk and Snee (1998)","Isochron age.   Preferred age is 22.56 ± 0.13 based on multiple samples from same flow."]
["Silicic dike","Flattops area","JS-98-13",-1.06953100000e+002,3.98485999996e+001,"Vail","Burns South","40Ar/39Ar","Sanidine",20.200000,"0.05","20.16","Kunk and others (2001)","Weighted mean age."]
["Basalt","Carbondale area","K97-10-8A2",-1.07150000000e+002,3.94219000001e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",9.880000,"0.06","9.88","Kunk and others (2001)","Plateau age.   Preferred age is 9.89 ± 0.06 based on multiple samples of same flow."]
["Basalt","Carbondale area","K97-10-8A4",-1.07150000000e+002,3.94219000001e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",9.890000,"0.07","9.89","Kunk and others (2001)","Plateau age."]
["Basalt","Carbondale area","K97-10-8C2",-1.07270000000e+002,3.95150000001e+001,"Carbondale","Glenwood Springs","40Ar/39Ar","Matrix",23.000000,"0.33","23.05","Kunk and others (2001)","Isochron age.  Preferred age is 22.56 ± 0.13 based on multiple samples from same flow."]
["Basalt","Carbondale area","K97-10-8C4",-1.07270000000e+002,3.95150000001e+001,"Carbondale","Glenwood Springs","40Ar/39Ar","Matrix",22.600000,"0.13","22.56","Kunk and others (2001)","Plateau age."]
["Basalt","Carbondale area","K97-10-8E1",-1.07200000000e+002,3.94353000000e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",9.750000,"0.06","9.75","Kunk and others (2001)","Plateau age."]
["Basalt","Carbondale area","K97-10-8E3",-1.07200000000e+002,3.94353000000e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",10.500000,"2.34","10.47","Kunk and others (2001)","Isochron age.  Preferred age is 9.75 ± 0.06 based on multiple samples from same flow."]
["Basalt","Carbondale area","K97-10-8F3",-1.07200800000e+002,3.94343999999e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",10.700000,"0.12","10.72","Kunk and others (2001)","Isochron age.  Preferred age is 9.91 based on multiple samples of same flow."]
["Basalt","Carbondale area","K97-10-8F4",-1.07200800000e+002,3.94343999999e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",10.300000,"0.12","10.28","Kunk and others (2001)","Isochron age.  Preferred age is 9.91 based on multiple samples of same flow."]
["Basalt","Basalt area","K97-8-11A1",-1.07003900000e+002,3.93998000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.500000,"0.21","10.47","Kunk and others (2001)","Isochron age.  Preferred age is 10.49 ± 0.07 based on multiple samples from same flow."]
["Basalt","Basalt area","K97-8-11A2",-1.07003900000e+002,3.93998000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.500000,"0.07","10.49","Kunk and others (2001)","Plateau age."]
["Basalt","Basalt area","K97-8-11B",-1.07003900000e+002,3.93998000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.870000,"Not report","9.87","Kunk and others (2001)","Total gas age."]
["Basalt","Basalt area","K97-8-11C1",-1.07003900000e+002,3.93998000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.200000,"0.06","10.18","Kunk and others (2001)","Plateau age."]
["Basalt","Basalt area","K97-8-11C3",-1.07003900000e+002,3.93998000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.200000,"0.14","10.16","Kunk and others (2001)","Isochron age.  Preferred age is 10.18 ± 0.06 based on multiple samples from same flow."]
["Basalt","Flattops area","K97-8-11D3",-1.07003900000e+002,3.99980000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",11.400000,"Not report","11.39","Kunk and others (2001)","Total gas age."]
["Basalt","Basalt area","K97-8-11E1",-1.07002200000e+002,3.93998000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.100000,"0.17","10.07","Kunk and others (2001)","Isochron age."]
["Basalt","Basalt area","K97-8-11E2",-1.07002200000e+002,3.93998000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.200000,"0.07","10.2","Kunk and others (2001)","Isochron age.   Preferred age is 10.07 ± 0.17 based on multiple samples from same flow."]
["Basalt","Basalt area","K97-8-11F",-1.07066700000e+002,3.93484999999e+001,"Carbondale","Basalt","40Ar/39Ar","Sanidine",35.200000,"0.03","35.21","Kunk and others (2001)","Laser fusion, weighted mean age."]
["Basalt","Independence Pass area","K97-8-12A2",-1.06916700000e+002,3.93028000004e+001,"Leadville","Woody Creek","40Ar/39Ar","Matrix",1.510000,"0.03","1.51","Kunk and others (2001)","Isochron age.  Preferred age is 1.36 ± 0.04 based on multiple samples from same flow."]
["Basalt","Independence Pass area","K97-8-12B1",-1.06915300000e+002,3.93055999999e+001,"Leadville","Woody Creek","40Ar/39Ar","Matrix",1.440000,"0.13","1.44","Kunk and others (2001)","Isochron age.  Preferred age is 1.42 ± 0.13 based on multiple samples from same flow."]
["Basalt","Independence Pass area","K97-8-12B2",-1.06915300000e+002,3.93055999999e+001,"Leadville","Woody Creek","40Ar/39Ar","Matrix",1.400000,"0.21","1.4","Kunk and others (2001)","Isochron age.  Preferred age is 1.42 ± 0.13 based on multiple samples from same flow."]
["Basalt","Basalt area","K97-8-12E1",-1.07097200000e+002,3.94086000004e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.700000,"0.15","10.7","Kunk and others (2001)","Isochron age."]
["Basalt","Basalt area","K97-8-12E2",-1.07097200000e+002,3.94086000004e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",8.960000,"0.34","8.96","Kunk and others (2001)","Isochron age.  Preferred age is 10.70 ± 0.15 based on multiple samples of same flow."]
["Basalt","Basalt area","K97-8-12F1",-1.07097200000e+002,3.94086000004e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.800000,"0.06","10.84","Kunk and others (2001)","Plateau age."]
["Basalt","Basalt area","K97-8-12F2",-1.07097200000e+002,3.94086000004e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",11.100000,"0.17","11.07","Kunk and others (2001)","Isochron age.  Preferred age is 10.84 based on multiple samples of same flow."]
["Basalt","Basalt area","K97-8-12G",-1.07111400000e+002,3.94675999996e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",3.010000,"0.01","3.01","Kunk and others (2001)","Plateau age."]
["Basalt","Basalt area","K97-8-12H",-1.07108900000e+002,3.94630999999e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",3.090000,"0.02","3.09","Kunk and others (2001)","Plateau age."]
["Basalt","Yarmony Mountain","K97-8-13A1",-1.06654200000e+002,3.99132999999e+001,"Vail","McCoy","40Ar/39Ar","Matrix",23.000000,"0.15","22.95","Kunk and others (2001)","Isochron age.  Preferred age is 22.89 ± 0.12 based on multiple samples from same flow."]
["Basalt","Yarmony Mountain","K97-8-13A1-3",-1.06649400000e+002,3.99119000001e+001,"Vail","McCoy","40Ar/39Ar","Matrix",22.700000,"0.2","22.71","Kunk and others (2001)","Isochron age.  Preferred age is 22.65 ± 0.20 based on multiple samples from same flow."]
["Basalt","Yarmony Mountain","K97-8-13A1-4",-1.06649400000e+002,3.99119000001e+001,"Vail","McCoy","40Ar/39Ar","Matrix",22.600000,"0.26","22.59","Kunk and others (2001)","Isochron age.  Preferred age is 22.65 ± 0.20 based on multiple samples from same flow."]
["Basalt","Yarmony Mountain","K97-8-13A2",-1.06654200000e+002,3.99132999999e+001,"Vail","McCoy","40Ar/39Ar","Matrix",22.900000,"0.13","22.92","Kunk and others (2001)","Plateau age.  Preferred age is 22.89 ± 0.12 based on multiple samples from same flow."]
["Basalt","Yarmony Mountain","K97-8-13B2",-1.06652800000e+002,3.99158000000e+001,"Vail","McCoy","40Ar/39Ar","Matrix",22.900000,"0.13","22.9","Kunk and others (2001)","Plateau age.  Preferred age is 22.89 ± 0.12 based on multiple samples from same flow."]
["Basalt","Yarmony Mountain","K97-8-13B3",-1.06652800000e+002,3.99158000000e+001,"Vail","McCoy","40Ar/39Ar","Matrix",22.900000,"0.13","22.88","Kunk and others (2001)","Plateau age.  Preferred age is 22.89 ± 0.12 based on multiple samples from same flow."]
["Basalt","State Bridge area","K97-8-13C2",-1.06626255294e+002,3.98644905639e+001,"Vail","State Bridge","40Ar/39Ar","Matrix",23.900000,"0.36","23.88","Kunk and others (2001)","Isochron age.  Preferred age is 23.97 ± 0.29 based on multiple samples from same flow."]
["Basalt","State Bridge area","K97-8-13C3",-1.06626255000e+002,3.98644910000e+001,"Vail","State Bridge","40Ar/39Ar","Matrix",24.100000,"0.29","24.06","Kunk and others (2001)","Isochron age.  Preferred age is 23.97 ± 0.29 based on multiple samples from same flow."]
["Basalt","Basalt area","K97-8-15A3",-1.07091700000e+002,3.94213999996e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.600000,"0.07","10.63","Kunk and others (2001)","Plateau age.  Preferred age is 10.60 ± 0.07 based on multiple samples of same flow."]
["Basalt","Basalt area","K97-8-15A4",-1.07091700000e+002,3.94213999996e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.600000,"0.07","10.56","Kunk and others (2001)","Plateau age.  Preferred age is 10.60 ± 0.07 based on multiple samples of same flow."]
["Basalt","Basalt area","K97-8-15B",-1.07015800000e+002,3.94096999998e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.830000,"0.05","9.83","Kunk and others (2001)","Plateau age."]
["Basalt","Basalt area","K97-8-15C2",-1.07013900000e+002,3.94105999999e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",10.400000,"0.09","10.42","Kunk and others (2001)","Isochron age.  Preferred age is 9.97 ± 0.06 based on multiple samples from same flow."]
["Basalt","Basalt area","K97-8-15C4",-1.07013900000e+002,3.94105999999e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.970000,"0.06","9.97","Kunk and others (2001)","Plateau age."]
["Basalt","Eagle area","K99-10-24A3",-1.06967500000e+002,3.96838000003e+001,"Vail","Gypsum","40Ar/39Ar","Matrix",22.500000,"0.08","22.52","Kunk and others (2001)","Plateau age."]
["Basalt","Eagle area","K99-10-24A5",-1.06967500000e+002,3.96838000003e+001,"Vail","Gypsum","40Ar/39Ar","Matrix",22.500000,"0.35","22.51","Kunk and others (2001)","Isochron age.  Preferred age is 22.52 ± 0.08 based on multiple samples from same flow."]
["Basalt","Independence Pass area","K99-8-22A1",-1.06917400000e+002,3.93046999998e+001,"Leadville","Woody Creek","40Ar/39Ar","Matrix",1.360000,"0.04","1.36","Kunk and others (2001)","Isochron age."]
["Basalt","Independence Pass area","K99-8-22A4",-1.06917400000e+002,3.93046999998e+001,"Leadville","Woody Creek","40Ar/39Ar","Matrix",1.410000,"0.01","1.41","Kunk and others (2001)","Plateau age.  Preferred age is 1.36 ± 0.04 based on multiple samples from same flow."]
["Basalt","Independence Pass area","K99-8-22B2",-1.06916700000e+002,3.93046999998e+001,"Leadville","Woody Creek","40Ar/39Ar","Matrix",1.340000,"0.01","1.34","Kunk and others (2001)","Plateau age."]
["Basalt","Independence Pass area","K99-8-22B3",-1.06916700000e+002,3.93046999998e+001,"Leadville","Woody Creek","40Ar/39Ar","Matrix",1.340000,"0.01","1.34","Kunk and others (2001)","Plateau age."]
["Basalt","Carbondale area","KH-95-24",-1.07360800000e+002,3.94163888891e+001,"Carbondale","Cattle Creek","40Ar/39Ar","Matrix",9.970000,"0.31","9.97","Kunk and Snee (1998)","Isochron age."]
["Basalt","Basalt area","L-176",-1.07066000000e+002,3.94130000000e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.680000,"0.03","9.68","Kunk and others (2001)","Plateau age."]
["Basalt","Basalt area","L-181",-1.07018000000e+002,3.94459000003e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.550000,"Not report","9.55","Kunk and others (2001)","Total gas age."]
["Basalt","Basalt area","L-187A2",-1.07046000000e+002,3.94309999996e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.840000,"0.07","9.84","Kunk and others (2001)","Isochron age."]
["Basalt","Basalt area","L-187B3",-1.07045000000e+002,3.94319999998e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.380000,"Not report","9.38","Kunk and others (2001)","Total gas age."]
["Basalt","Basalt area","L-187D1",-1.07045000000e+002,3.94319999998e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.750000,"0.11","9.75","Kunk and others (2001)","Isochron age."]
["Basalt","Basalt area","L-223",-1.07150000000e+002,3.93900000000e+001,"Carbondale","Carbondale","40Ar/39Ar","Matrix",13.400000,"0.06","13.38","Kunk and others (2001)","Isochron age."]
["Basalt","Basalt area","L-244",-1.07083000000e+002,3.94330000001e+001,"Carbondale","Leon","40Ar/39Ar","Sanidine",2.900000,"0.02","2.9","Kunk and others (2001)","Laser fusion, weighted mean age.  Sanidine is xenocrystic in basalt flow."]
["Basalt","Basalt area","L244-1",-1.07083000000e+002,3.94330000001e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",2.870000,"0.01","2.87","Kunk and others (2001)","Plateau age.  Preferred age is 2.90 ± 0.02 based on multiple samples from same flow."]
["Basalt","Basalt area","L244-2",-1.07083000000e+002,3.94330000001e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",2.900000,"0.02","2.9","Kunk and others (2001)","Weighted mean age."]
["Basalt","Basalt area","L-245",-1.07080000000e+002,3.94339000002e+001,"Carbondale","Leon","40Ar/39Ar","Sanidine",2.960000,"0.02","2.96","Kunk and others (2001)","Laser fusion, weighted mean age.  Sanidine is xenocrystic in basalt flow."]
["Basalt","Basalt area","L-37",-1.07015000000e+002,3.94105999999e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.840000,"Not report","9.84","Kunk and others (2001)","Total gas age."]
["Basalt","Flattops area","L-38A",-1.07002000000e+002,3.99900000002e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.660000,"Not report","9.66","Kunk and others (2001)","Total gas age."]
["Basalt","Basalt area","L-39",-1.07039000000e+002,3.94410000001e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.750000,"0.03","9.75","Kunk and others (2001)","Plateau age."]
["Basalt","Basalt area","L60",-1.07061000000e+002,3.94749999999e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",7.750000,"0.03","7.75","Kunk and others (2001)","Plateau age."]
["Basalt","Eagle area","L6681B",-1.06740555556e+002,3.96624999996e+001,"Vail","Wolcott","40Ar/39Ar","Matrix",22.800000,"0.33","22.8","Kunk and Snee (1998)","Isochron age."]
["Basalt","Eagle area","L6844",-1.06740500000e+002,3.96624999996e+001,"Vail","Fulford","40Ar/39Ar","Matrix",22.300000,"0.12","22.31","Kunk and Snee (1998)","Plateau age."]
["Basalt","Basalt area","L-91A1",-1.07033000000e+002,3.94420000004e+001,"Carbondale","Leon","40Ar/39Ar","Matrix",9.710000,"0.03","9.71","Kunk and others (2001)","Plateau age."]
["Basalt","Gypsum area","CP8",-1.07105555556e+002,3.95733333338e+001,"Glenwood Springs","Cottonwood Pass","40Ar/39Ar","Matrix",7.740000,"0.06","7.74","Kunk and Snee (1998)","Isochron age."]
["Basalt","Gypsum area","CP-86",-1.07115277778e+002,3.95111111114e+001,"Glenwood Springs","Cottonwood Pass","40Ar/39Ar","Matrix",3.170000,"0.02","3.17","Kunk and Snee (1998)","Plateau age."]
["Basalt","Gypsum area","CP-89",-1.07068888889e+002,3.96644444445e+001,"Glenwood Springs","Cottonwood Pass","40Ar/39Ar","Matrix",7.720000,"0.04","7.72","Kunk and Snee (1998)","Plateau age."]
["Basalt","Glenwood Springs area","DT-R2",-1.07270000000e+002,3.96644444445e+001,"Glenwood Springs","Dotsero","40Ar/39Ar","Matrix",22.400000,"0.2","22.38","Kunk and Snee (1998)","Isochron age.  Preferred age is 23.41 ± 0.13 based on multiple samples from same flow."]
["Basalt","Glenwood Springs area","DT-R3",-1.07508055556e+002,3.96594444442e+001,"Glenwood Springs","Dotsero","40Ar/39Ar","Matrix",0.380000,"0.01","0.38","Kunk and Snee (1998)","Plateau age.  Preferred age is 0.28 ± 0.04 based on multiple samples from same flow."]
["Basalt","Glenwood Springs area","GS96-1",-1.07259722222e+002,3.95352777775e+001,"Glenwood Springs","Glenwood Springs","40Ar/39Ar","Matrix",9.720000,"0.05","9.72","Kunk and Snee (1998)","Plateau age."]
["Silicic tuff","Flattops area","JS-98-17",-1.07018000000e+002,3.98121999998e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Sanidine",19.400000,"0.05","19.35","Kunk and others (2001)","Laser fusion, weighted mean age.  Preferred age is 19.40 ± 0.05 based on multiple samples from same flow."]
["Silicic tuff","Flattops area","JS-98-2",-1.07020200000e+002,3.98056000004e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Sanidine",19.400000,"0.06","19.45","Kunk and others (2001)","Laser fusion, isochron age.  Preferred age is 19.40 ± 0.05 based on multiple samples from same flow."]
["Silicic tuff","Flattops area","JS-98-25",-1.07003900000e+002,3.98210999999e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Sanidine",19.400000,"0.05","19.45","Kunk and others (2001)","Laser fusion, weighted mean age.  Preferred age is 19.40 ± 0.05 based on multiple samples from same flow."]
["Silicic tuff","Flattops area","JS-98-5",-1.07002800000e+002,3.98215000004e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Sanidine",19.400000,"0.05","19.43","Kunk and others (2001)","Laser fusion, weighted mean age.  Preferred age is 19.40 ± 0.05 based on multiple samples from same flow."]
["Silicic tuff","Flattops area","JS-98-93",-1.07004000000e+002,3.98320999998e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Sanidine",19.400000,"0.05","19.42","Kunk and others (2001)","Laser fusion, weighted mean age.  Preferred age is 19.40 ± 0.05 based on multiple samples from same flow."]
["Basalt","Volcanic clast in Poison Creek debris flow deposit","JS-99-10",-1.07003400000e+002,3.98061000001e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.900000,"0.15","14.87","Kunk and others (2001)","Isochron age."]
["Basalt","Volcanic clast in Poison Creek debris flow deposit","JS-99-8A",-1.07115200004e+002,3.98052000000e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.800000,"Not report","14.83","Kunk and others (2001)","Total gas age."]
["Basalt","Volcanic clast in Poison Creek debris flow deposit","JS-99-8B",-1.07012500000e+002,3.98056000004e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.700000,"0.08","14.74","Kunk and others (2001)","Plateau age."]
["Basalt","Volcanic clast in Poison Creek debris flow deposit","JS-99-8C",-1.07131800000e+002,3.98070000002e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",15.100000,"0.21","15.09","Kunk and others (2001)","Isochron age."]
["Basalt","Volcanic clast in Poison Creek debris flow deposit","JS-99-9",-1.07015100000e+002,3.98052000000e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.510000,"0.14","14.51","Kunk and others (2001)","Isochron age.  Preferred age is 14.48 ± 0.08."]
["Basalt","Eagle area","K97-10-7F",-1.07124700000e+002,3.96593999997e+001,"Glenwood Springs","Dotsero","40Ar/39Ar","Matrix",0.260000,"0.04","0.26","Kunk and others (2001)","Isochron age.  Preferred age is 0.28 ± 0.04 based on multiple samples from same flow."]
["Basalt","Eagle area","K97-10-7G",-1.07124200000e+002,3.96494000001e+001,"Glenwood Springs","Dotsero","40Ar/39Ar","Matrix",0.300000,"0.08","0.3","Kunk and others (2001)","Isochron age.  Preferred age is 0.28 ± 0.04 based on multiple samples from same flow."]
["Basalt","Eagle area","K97-10-7K5",-1.07007600000e+002,3.96644000000e+001,"Glenwood Springs","Dotsero","40Ar/39Ar","Matrix",23.400000,"0.13","23.41","Kunk and others (2001)","Plateau age.  Preferred age is 23.41 based on multiple samples from same flow."]
["Basalt","Glenwood Springs area","K97-10-8B1",-1.07275600000e+002,3.95193999997e+001,"Glenwood Springs","Glenwood Springs","40Ar/39Ar","Matrix",11.100000,"0.23","11.11","Kunk and others (2001)","Isochron age.  Preferred age is 9.78 ± 0.23 based on multiple samples from same flow."]
["Basalt","Glenwood Springs area","K97-10-8B3",-1.07275600000e+002,3.95193999997e+001,"Glenwood Springs","Glenwood Springs","40Ar/39Ar","Matrix",9.780000,"0.23","9.78","Kunk and others (2001)","Isochron age."]
["Basalt","Glenwood Springs area","K97-10-8D1",-1.07271700000e+002,3.95193999997e+001,"Glenwood Springs","Glenwood Springs","40Ar/39Ar","Matrix",7.740000,"0.05","7.74","Kunk and others (2001)","Plateau age.  Preferred age is 7.77 ± 0.05 based on multiple samples from same flow."]
["Basalt","Glenwood Springs area","K97-10-8D2",-1.07271700000e+002,3.95193999997e+001,"Glenwood Springs","Glenwood Springs","40Ar/39Ar","Matrix",7.790000,"0.05","7.79","Kunk and others (2001)","Plateau age.  Preferred age is 7.77 ± 0.05 based on multiple samples from same flow."]
["Silicic tuff","Flattops area","K97-8-13D",-1.07002800000e+002,3.98215000004e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Sanidine",19.400000,"0.05","19.41","Kunk and others (2001)","Laser fusion, weighted mean age.  Preferred age is 19.40 ± 0.05 based on multiple samples from same flow."]
["Basalt","Eagle area","K99-8-24A",-1.07125700000e+002,3.96640000004e+001,"Glenwood Springs","Sweetwater Lake","40Ar/39Ar","Matrix",13.400000,"0.16","13.45","Kunk and others (2001)","Isochron age."]
["Basalt","Flattops area","K99-8-24B1",-1.07122000000e+002,3.98700999996e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.100000,"0.05","14.06","Kunk and others (2001)","Plateau age."]
["Basalt","Flattops area","K99-8-24B3",-1.07122000000e+002,3.98700999996e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.300000,"0.07","14.27","Kunk and others (2001)","Isochron age.  Preferred age is 14.06 ± 0.05 based on multiple samples from same flow."]
["Basalt","Flattops area","K99-8-24C",-1.07106100000e+002,3.98700999996e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.400000,"0.05","14.36","Kunk and others (2001)","Plateau age."]
["Basalt","Flattops area","K99-8-24D1",-1.07101400000e+002,3.98731000003e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",14.900000,"0.18","14.91","Kunk and others (2001)","Isochron age.  Preferred age is 15.01 ± 0.18 based on multiple samples from same flow."]
["Basalt","Flattops area","K99-8-24D2",-1.07101400000e+002,3.98731000003e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",15.100000,"0.18","15.11","Kunk and others (2001)","Isochron age.  Preferred age is 15.01 ± 0.18 based on multiple samples from same flow."]
["Basalt","Basalt area","K99-8-24E",-1.07098900000e+002,3.94086000004e+001,"Glenwood Springs","Sugarloaf  Mountain","40Ar/39Ar","Matrix",15.600000,"0.09","15.57","Kunk and others (2001)","Isochron age."]
["Basalt","Gypsum area","KH-95-26",-1.07076111111e+002,3.95799999999e+001,"Glenwood Springs","Cottonwood Pass","40Ar/39Ar","Matrix",3.030000,"0.02","3.03","Kunk and Snee (1998)","Plateau age."]
["Basalt","Gypsum area","KH-95-32",-1.07096666667e+002,3.95841666668e+001,"Glenwood Springs","Cottonwood Pass","40Ar/39Ar","Matrix",7.800000,"0.04","7.8","Kunk and Snee (1998)","Plateau age."]
["Basalt","Gypsum area","SH-267",-1.07139444444e+002,3.95169444441e+001,"Glenwood Springs","Shoshone","40Ar/39Ar","Sanidine",3.970000,"0.08","3.97","Kunk and Snee (1998)","Isochron age.  Sanidine is xenocrystic in basalt."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",514.000000,"2.3","513.9","Lanphere and others (1990)","Location approximate."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",514.300000,"2.6","514.3","Lanphere and others (1990)","Location approximate.  Total-fusion age."]
["Shoshonite","Table Mountain","VD.1",-1.05190277777e+002,4.00316666663e+001,"Estes Park","Niwot","K/Ar","Whole-rock (?)",64.900000,"2.6","64.9","Larson and Drexler (1988)","Valmont dike."]
["Basalt","Basalt area",null,-1.07097777778e+002,3.94097222221e+001,"Carbondale","Leon","K/Ar","Whole-rock",8.070000,"0.4","7.86","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Basalt area",null,-1.07043333333e+002,3.94413888886e+001,"Carbondale","Leon","K/Ar","Whole-rock",9.010000,"0.4","8.78","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Basalt area",null,-1.07149444445e+002,3.94224999999e+001,"Carbondale","Leon","K/Ar","Whole-rock",8.910000,"0.4","8.68","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Basalt area",null,-1.07050277777e+002,3.95311111115e+001,"Glenwood Springs","Cottonwood Pass","K/Ar","Whole-rock",11.400000,"1","11.1","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Glenwood Springs area",null,-1.07255555555e+002,3.95333333335e+001,"Glenwood Springs","Glenwood Springs","K/Ar","Whole-rock",10.400000,"0.5","10.1","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07250000000e+002,3.99444444444e+001,"Glenwood Springs","Trappers Lake","K/Ar","Whole-rock",13.800000,"0.5","13.4","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07186944445e+002,3.98466666667e+001,"Glenwood Springs","Sweetwater Lake","K/Ar","Whole-rock",21.200000,"0.8","20.63","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07186944445e+002,3.98466666667e+001,"Glenwood Springs","Sweetwater Lake","K/Ar","Whole-rock",20.600000,"0.8","20.05","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07186944445e+002,3.98466666667e+001,"Glenwood Springs","Sweetwater Lake","K/Ar","Whole-rock",20.400000,"0.8","19.9","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07186944445e+002,3.98466666667e+001,"Glenwood Springs","Sweetwater Lake","K/Ar","Whole-rock",19.000000,"0.8","18.5","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07186944445e+002,3.98466666667e+001,"Glenwood Springs","Sweetwater Lake","K/Ar","Whole-rock",22.800000,"1","22.2","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07186944445e+002,3.98466666667e+001,"Glenwood Springs","Sweetwater Lake","K/Ar","Whole-rock",21.200000,"1","20.7","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07186944445e+002,3.98466666667e+001,"Glenwood Springs","Sweetwater Lake","K/Ar","Whole-rock",22.000000,"1","21.4","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07201111111e+002,3.99936111109e+001,"Glenwood Springs","Trappers Lake","K/Ar","Whole-rock",23.600000,"1","23","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basaltic andesite","Flattops area",null,-1.07175555556e+002,3.98786111113e+001,"Glenwood Springs","Trappers Lake","K/Ar","Whole-rock",9.900000,"0.5","9.6","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basaltic andesite","Flattops area",null,-1.07131111111e+002,3.99644444446e+001,"Glenwood Springs","Dome","K/Ar","Whole-rock",10.600000,"0.5","10.3","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basaltic andesite","Flattops area",null,-1.07186944445e+002,3.98577777778e+001,"Glenwood Springs","Trappers Lake","K/Ar","Whole-rock",13.500000,"0.5","13.17","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Independence Pass area",null,-1.06914722222e+002,3.93044444449e+001,"Leadville","Woody Creek","K/Ar","Whole-rock",2.030000,"0.3","1.98","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Independence Pass area",null,-1.06914722222e+002,3.93050000002e+001,"Leadville","Woody Creek","K/Ar","Whole-rock",1.280000,"0.2","1.25","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","McCoy flow",null,-1.06721666666e+002,3.99486111113e+001,"Vail","McCoy","K/Ar","Whole-rock",0.660000,"0.2","0.64","Larson and others (1975)","No sample number reported.  Recalculated by Wallace (1993, 1995)."]
["Basalt","Gore Canyon area",null,-1.06530279709e+002,3.99558856894e+001,"Vail","Radium","K/Ar","Whole-rock",23.800000,"1","23.2","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Flattops area",null,-1.07000000000e+002,3.99291666665e+001,"Vail","Burns North/Dome Peak","K/Ar","Whole-rock",22.700000,"1","22.1","Larson and others (1975)","No sample number reported.  Age recalculated by Wallace (1993, 1995)."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",519.700000,"0.6","519.7","Lee and others (1991)","Location approximate.  Integrated age."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",519.500000,"0.6","519.5","Lee and others (1991)","Location approximate.  Plateau age."]
["Kimberlite","Chicken Park kimberlite","Chicken Park kimberlite",-1.05550000000e+002,4.08803000004e+001,"Fort Collins","Diamond  Peak","40Ar/39Ar","Phlogopite",616.000000,"2",null,"Lester and others (2001)","Naeser suggest that phlogopites in kimberlites may be much older than their emplacement age as shown by age of rocks intruded."]
["Granodiorite","Mount Princeton pluton","PRC-113-15",-1.06227222222e+002,3.87186111112e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",37.000000,"2","36","Limbach (1975)","Location approximate."]
["Rhyolite","Lower Chalk Creek","PRC-113-24",-1.06232225645e+002,3.87193068249e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",26.000000,"1","25","Limbach (1975)","Location approximate."]
["Quartz monzonite porphyry","Mount Princeton pluton","PRC-113-26",-1.06213611111e+002,3.86977777777e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",25.000000,"1","24","Limbach (1975)","Location approximate."]
["Rhyolite","Rasberry Gulch rhyolite","PRC-113-27",-1.06176041789e+002,3.86856051635e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",23.000000,"1","22","Limbach (1975)","Location approximate."]
["Sandstone","Minturn Formation","A-83",-1.05656666667e+002,3.80902777780e+001,"Canon City","Rito Alto Peak","FT","Apatite",23.700000,"9.5","23.7","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Sandstone","Minturn Formation","A-83",-1.05656666667e+002,3.80902777780e+001,"Canon City","Rito Alto Peak","FT","Zircon",612.000000,"66","612","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Sandstone","Clast in Sangre de Cristo Formation","SC-1090",-1.05750833334e+002,3.81052777779e+001,"Canon City","Mirage","FT","Apatite",17.300000,"5","17.3","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Sandstone","Clast in Sangre de Cristo Formation","SC-1090",-1.05750833334e+002,3.81052777779e+001,"Canon City","Mirage","FT","Zircon",265.000000,"14","265","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Gneiss","Wild Cherry Creek, Sangre de Cristo Mountains","SC-1091",-1.05760833333e+002,3.81080555552e+001,"Canon City","Mirage","FT","Apatite",20.000000,"4.6","20","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Sandstone","Minturn Formation","SC-221",-1.05633888889e+002,3.81011111110e+001,"Canon City","Rito Alto Peak","FT","Apatite",18.900000,"4.7","18.9","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Sandstone","Minturn Formation","SC-221",-1.05633888889e+002,3.81011111110e+001,"Canon City","Rito Alto Peak","FT","Zircon",594.000000,"71","594","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Sandstone","Sangre de Cristo Formation","SC-222",-1.05618888889e+002,3.81049999998e+001,"Canon City","Horn Peak","FT","Apatite",15.000000,"3.9","15","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Sandstone","Sangre de Cristo Formation","SC-222",-1.05618888889e+002,3.81049999998e+001,"Canon City","Horn Peak","FT","Zircon",307.000000,"28","307","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Syenite","Clast in Sangre de Cristo Formation","SC-273A",-1.05721666666e+002,3.81158333337e+001,"Canon City","Rito Alto Peak","FT","Apatite",17.300000,"4","17.3","Lindsey and others (1986)","Annealing age due to uplift."]
["Syenite","Clast in Sangre de Cristo Formation","SC-273A",-1.05721666666e+002,3.81158333337e+001,"Canon City","Rito Alto Peak","FT","Zircon",299.000000,"26","299","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Felsite","Felsite dike. central Sange de Cristo Mountains","SC-377",-1.05611280972e+002,3.80823731744e+001,"Canon City","Horn Peak","FT","Zircon",26.500000,"1.1","26.5","Lindsey and others (1986)","Annealing age."]
["Sandstone","Minturn Formation","SC-4",-1.05651666666e+002,3.80911111114e+001,"Canon City","Rito Alto Peak","FT","Zircon",521.000000,"106","521","Lindsey and others (1986)","Annealing age due to uplift.  Location approximate."]
["Quartz latite","Tuff of Masonic Park","735",-1.06658333333e+002,3.76833333331e+001,"Del Norte","South Fork West","K/Ar","Biotite",28.900000,"Not report","28.2","Lipman and others (1970)",null]
["Quartz latite","Fisher Quartz Latite, Wagon Wheel Gap flow","736",-1.06824444444e+002,3.77708333330e+001,"Del Norte","Wagon Wheel Gap","K/Ar","Biotite",27.200000,"Not report","26.5","Lipman and others (1970)",null]
["Rhyolite","Mammoth Mountain Rhyolite","737",-1.06786666667e+002,3.77680555557e+001,"Del Norte","Wagon Wheel Gap","K/Ar","Biotite",27.400000,"Not report","26.7","Lipman and others (1970)",null]
["Rhyolite","Treasure Mountain Rhyolite, tuff from Treasure Mountain","65L-132",-1.06816666667e+002,3.74666666670e+001,"Antonito","Wolf Creek Pass","K/Ar","Biotite",30.400000,"1.2","29.6","Lipman and others (1970)",null]
["Rhyolite","Treasure Mountain Rhyolite, tuff from Treasure Mountain","65L-132",-1.06816666667e+002,3.74666666670e+001,"Antonito","Wolf Creek Pass","K/Ar","Plagioclase",30.800000,"2.2","30","Lipman and others (1970)",null]
["Rhyolite","Hinsdale Formation, Beaver Creek flow","65L-161-A",-1.06633333333e+002,3.75166666668e+001,"Del Norte","Beaver Creek Reservoir","K/Ar","Obsidian",22.500000,"0.9","21.9","Lipman and others (1970)",null]
["Rhyolite","Treasure Mountain Rhyolite, intracaldera tuff","65L-231",-1.06591666667e+002,3.73208333333e+001,"Antonito","Platoro","K/Ar","Biotite",28.300000,"1.1","27.6","Lipman and others (1970)",null]
["Rhyolite","Treasure Mountain Rhyolite, intracaldera tuff","65L-231",-1.06591666667e+002,3.73208333333e+001,"Antonito","Platoro","K/Ar","Plagioclase",27.700000,"1.2","27","Lipman and others (1970)",null]
["Rhyodacite","Upper flow, Green Ridge area","66L-101-B",-1.06216666666e+002,3.74666666670e+001,"Antonito","Fulcher Gulch","K/Ar","Biotite",29.400000,"1.1","28.7","Lipman and others (1970)",null]
["Rhyodacite","Upper flow, Green Ridge area","66L-101-B",-1.06216666666e+002,3.74666666670e+001,"Antonito","Fulcher Gulch","K/Ar","Plagioclase",26.900000,"2.2","26.2","Lipman and others (1970)",null]
["Rhyolite","Conejos Formation, Summer Coon volcanic center","66L-120",-1.06333333334e+002,3.78166666669e+001,"Del Norte","Twin Mountains SE","K/Ar","Biotite",33.200000,"1.3","32.4","Lipman and others (1970)",null]
["Olivine basalt","Hinsdale Formation, Beaver Creek flow","67L-107-B",-1.06616666666e+002,3.75333333335e+001,"Del Norte","Del Norte Peak","K/Ar","Whole-rock",24.000000,"1","23.4","Lipman and others (1970)",null]
["Rhyodacite","Lower flow, Green Ridge area","67L-109",-1.06250000000e+002,3.73999999996e+001,"Antonito","Green Mountain/Fulcher Gulch","K/Ar","Biotite",29.200000,"1.2","28.5","Lipman and others (1970)",null]
["Rhyodacite","Lower flow, Green Ridge area","67L-109",-1.06250000000e+002,3.73999999996e+001,"Antonito","Green Mountain/Fulcher Gulch","K/Ar","Plagioclase",27.700000,"2.3","27","Lipman and others (1970)",null]
["Rhyodacite","Lower flow, Green Ridge area","67L-109",-1.06250000000e+002,3.73999999996e+001,"Antonito","Green Mountain/Fulcher Gulch","K/Ar","Hornblende",32.600000,"2.3","31.8","Lipman and others (1970)",null]
["Rhyodacite","Lower flow, Green Ridge area","67L-109",-1.06250000000e+002,3.73999999996e+001,"Antonito","Green Mountain/Fulcher Gulch","K/Ar","Hornblende",32.400000,"2.3","31.6","Lipman and others (1970)",null]
["Monzonite","Alamosa River stock","67L-113",-1.06550000000e+002,3.73833333330e+001,"Antonito","Summitville","K/Ar","Biotite",29.900000,"1.2","29.1","Lipman and others (1970)",null]
["Rhyolite","Treasure Mountain Rhyolite, intracaldera tuff","67L-124",-1.06516666667e+002,3.73499999997e+001,"Antonito","Platoro","K/Ar","Biotite",29.200000,"1.4","28.5","Lipman and others (1970)",null]
["Olivine basalt","Hinsdale Formation, Los Mogotes flow","67L-16",-1.06183333333e+002,3.70666666662e+001,"Antonito","Fox Creek","K/Ar","Plagioclase",4.800000,"1.4","4.7","Lipman and others (1970)",null]
["Diabase","Hinsdale Formation, Los Mogotes dike","67L-17-A",-1.06183333333e+002,3.70666666662e+001,"Antonito","Fox Creek","K/Ar","Plagioclase",5.400000,"0.7","5.3","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation","68L-105",-1.06350000000e+002,3.78333333336e+001,"Del Norte","Twin Mountains SE","K/Ar","Biotite",35.000000,"1.4","34.1","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation","68L-105",-1.06350000000e+002,3.78333333336e+001,"Del Norte","Twin Mountains SE","K/Ar","Hornblende",34.700000,"1.6","33.8","Lipman and others (1970)",null]
["Rhyodacite","Late flow, lower member, Summitville area","68L-107",-1.06650000000e+002,3.73999999996e+001,"Antonito","Elwood Pass","K/Ar","Biotite",26.500000,"1","25.8","Lipman and others (1970)",null]
["Olivine basalt","Hinsdale Formation, La Jara flow","68L-17",-1.06200000000e+002,3.72333333334e+001,"Antonito","Vicente Canyon","K/Ar","Whole-rock",18.200000,"1.4","17.7","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation, Summer Coon volcanic center","68L-20",-1.06433333333e+002,3.77666666671e+001,"Del Norte","Twin Mountains","K/Ar","Biotite",35.300000,"1.4","34.4","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation, Summer Coon volcanic center","68L-20",-1.06433333333e+002,3.77666666671e+001,"Del Norte","Twin Mountains","K/Ar","Hornblende",35.900000,"2.4","35","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation","68L-91",-1.06716666667e+002,3.71000000004e+001,"Antonito","Chama Peak","K/Ar","Biotite",34.300000,"1.3","33.4","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation","68L-91",-1.06716666667e+002,3.71000000004e+001,"Antonito","Chama Peak","K/Ar","Hornblende",32.200000,"1.8","31.4","Lipman and others (1970)",null]
["Andesite","Conejos Formation","Ds141B",-1.06983333333e+002,3.73833333330e+001,"Antonito","Saddle Mountain","K/Ar","Plagioclase",31.900000,"2.7","31.1","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation, Beidell volcanic center","Ds196",-1.06266666666e+002,3.79583333337e+001,"Del Norte","Lime Creek","K/Ar","Biotite",35.100000,"1.4","34.2","Lipman and others (1970)",null]
["Rhyodacite","Conejos Formation, Beidell volcanic center","Ds196",-1.06266666666e+002,3.79583333337e+001,"Del Norte","Lime Creek","K/Ar","Hornblende",34.300000,"2.2","33.4","Lipman and others (1970)",null]
["Rhyolite","Tuff from Storm King Mountain","RD-1901-57",-1.07634722223e+002,3.82936111110e+001,"Montrose","Buckhorn Lakes","K/Ar","Biotite",30.100000,"1.2","29.3","Lipman and others (1970)",null]
["Rhyolite","Tuff from Storm King Mountain","RD-1901-57",-1.07634722223e+002,3.82936111110e+001,"Montrose","Buckhorn Lakes","K/Ar","Sanidine",28.100000,"0.8","27.4","Lipman and others (1970)",null]
["Rhyodacite","San Juan Formation","RD-336-68",-1.07635555556e+002,3.83313888892e+001,"Montrose","Buckhorn Lakes","K/Ar","Biotite",32.200000,"1.3","31.4","Lipman and others (1970)",null]
["Rhyodacite","San Juan Formation","RD-336-68",-1.07635555556e+002,3.83313888892e+001,"Montrose","Buckhorn Lakes","K/Ar","Hornblende",32.900000,"2.4","32.1","Lipman and others (1970)",null]
["Rhyodacite","San Juan Formation","RD-336-68",-1.07635555556e+002,3.83313888892e+001,"Montrose","Buckhorn Lakes","K/Ar","Plagioclase",33.800000,"4.3","32.9","Lipman and others (1970)",null]
["Andesite","Rawley Andesite, Bonanza volcanic center","V-998",-1.06100000000e+002,3.84552777778e+001,"Saguache","Poncha Pass","K/Ar","Biotite",34.100000,"1.3","33.2","Lipman and others (1970)",null]
["Andesite","Rawley Andesite, Bonanza volcanic center","V-998",-1.06100000000e+002,3.84552777778e+001,"Saguache","Poncha Pass","K/Ar","Plagioclase",34.600000,"2.1","33.7","Lipman and others (1970)",null]
["Andesite","Rawley Andesite, Bonanza volcanic center","V-999",-1.06118333333e+002,3.84394444446e+001,"Saguache","Poncha Pass","K/Ar","Plagioclase",35.100000,"1.6","34.2","Lipman and others (1970)",null]
["Uranium ore, Schwartzwalder mine","Illinois and Titan veins",null,-1.05280800000e+002,3.98438999996e+001,"Denver West","Ralston Buttes","U-Pb","Whole-rock",69.300000,"1.1","69.3","Ludwig and others (1985)","Isochron using  9 samples."]
["Disseminated uraninite","West of Mount Albion",null,-1.05662800000e+002,4.00516999998e+001,"Estes Park","Monarch Lake","U-Pb","Uraninite",1446.000000,"20",null,"Ludwig and Young (1975)","Concordia; disturbed at 880 and 130 Ma."]
["Granite","Windy Point pluton of Pikes Peak batholith","PP76-2",-1.05120000000e+002,3.88044444444e+001,"Pikes Peak","Pikes Peak","K-Ca","Mineral/Whole-rock",1041.000000,"32","1041","Marshall and DePaolo (1982)","Mineral, whole-rock isochron based on 5 points."]
["Quartz monzonite","Mount Princeton pluton","35",-1.06223055555e+002,3.87188888893e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",37.000000,"2","37","Marvin and Cole (1978)","Location approximate."]
["Rhyolite","Lower Chalk Creek dike","36",-1.06221768269e+002,3.87199236186e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",26.200000,"1","26.2","Marvin and Cole (1978)","Location approximate."]
["Quartz monzonite","Mount Princeton pluton","37",-1.06213333333e+002,3.86980555558e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",25.000000,"1","25","Marvin and Cole (1978)","Location approximate."]
["Rhyolite","Lower Chalk Creek dike","38",-1.06175089682e+002,3.86878508471e+001,"Gunnison","Mount Antero","K/Ar","Whole-rock",22.000000,"1","22","Marvin and Cole (1978)","Location approximate."]
["Andesite","Thirtynine Mile volcanic field(?)","R-3502",-1.05982222222e+002,3.85391666662e+001,"Pikes Peak","Cameron Mountain","K/Ar","Whole-rock",35.200000,"1.5","35.2","Marvin and Cole (1978)",null]
["Rhyolite","Ash flow, near Basalt","USGS(D)-A",-1.07100555555e+002,3.93463888891e+001,"Carbondale","Basalt","K/Ar","Biotite",36.300000,"0.9","36.3","Marvin and Cole (1978)",null]
["Gangue,  Schwartzwalder Mine","Schwartzwalder Mine","D2377F",-1.05280600000e+002,3.98444000002e+001,"Denver West","Ralston Buttes","K/Ar","K-feldspar",707.000000,"12",null,"Marvin and Dobson (1979)","Possible mixture of Proterozoic country rock feldspar and feldspar from vein."]
["Gangue,  Schwartzwalder Mine","Schwartzwalder Mine,orthoclase and adularia gangue of uranium vei","D2378F",-1.05280600000e+002,3.98444000002e+001,"Denver West","Ralston Buttes","K/Ar","K-feldspar",175.000000,"3",null,"Marvin and Dobson (1979)","Mixed age."]
["Pegmatite","Sheared pegmatite, Schwartzwalder Mine","Sch-164",-1.05283300000e+002,3.98500000002e+001,"Denver West","Ralston Buttes","K/Ar","Muscovite",1415.000000,"35",null,"Marvin and Dobson (1979)",null]
["Pegmatite","Sheared pegmatite with ore minerals, Schwartzwalder Mine","Sch-74",-1.05283300000e+002,3.98500000002e+001,"Denver West","Ralston Buttes","K/Ar","Muscovite",1455.000000,"35",null,"Marvin and Dobson (1979)","Minimum age of pegmatite."]
["Gneiss","Holy Cross area","USGS(D)-2-D-62",-1.06504166667e+002,3.93972222223e+001,"Leadville","Mount Jackson","K/Ar","Biotite",483.000000,"24","483","Marvin and Dobson (1979)",null]
["Quartz latite","Pando Porphyry","USGS(D)-72-92",-1.06305781717e+002,3.94302230025e+001,"Leadville","Pando","K/Ar","Sericite",63.000000,"1.5","63","Marvin and Dobson (1979)",null]
["Granite","Granite intruding Twin Lakes stock","USGS(D)-73-N7",-1.06450032849e+002,3.90723383045e+001,"Leadville","Mount Elbert","FT","Zircon",33.600000,"3","33.6","Marvin and Dobson (1979)",null]
["Granite","Granite intruding Twin Lakes stock","USGS(D)-73-N7",-1.06450173040e+002,3.90722484739e+001,"Leadville","Mount Elbert","FT","Sphene",36.200000,"4","36.2","Marvin and Dobson (1979)",null]
["Granodiorite","Twin Lakes stock","USGS(D)-73-N8",-1.06505924927e+002,3.90703185747e+001,"Leadville","Independence Pass","FT","Zircon",44.200000,"4","44.2","Marvin and Dobson (1979)",null]
["Granodiorite","Twin Lakes stock","USGS(D)-73-N8",-1.06505645521e+002,3.90700970807e+001,"Leadville","Independence Pass","FT","Sphene",45.900000,"4","45.9","Marvin and Dobson (1979)",null]
["Aplite","Twin Lakes stock","USGS(D)-73-N9",-1.06399722222e+002,3.90655555557e+001,"Leadville","Mount Elbert","FT","Sphene",43.400000,"1.8","43.4","Marvin and Dobson (1979)",null]
["Granite","Silver Plume pluton","USGS(D)-91",-1.06333333334e+002,3.94583333333e+001,"Leadville","Pando","K/Ar","Biotite",1150.000000,"30","1150","Marvin and Dobson (1979)","Intrusion age is about 1,450 Ma."]
["Tuff","Grizzly Peak Tuff","USGS(D)-A",-1.07100555555e+002,3.93463888891e+001,"Carbondale","Basalt","FT","Zircon",30.100000,"3","30.1","Marvin and Dobson (1979)",null]
["Tuff","Grizzly Peak Tuff","USGS(D)-A",-1.07100555555e+002,3.93463888891e+001,"Carbondale","Basalt","FT","Zircon",30.200000,"2.1","30.2","Marvin and Dobson (1979)",null]
["Quartz monzonite","Humbug stock","USGS(D)-D96",-1.06141086534e+002,3.94539976100e+001,"Leadville","Copper Mountain","K/Ar","Biotite",42.400000,"1","42.4","Marvin and Dobson (1979)",null]
["Augen gneiss","Stoll Mountain pluton","USGS(D)-E-628",-1.05466666667e+002,3.89333333333e+001,"Pikes Peak","Elevenmile Canyon","Rb-Sr","Whole-rock",1590.000000,"100","1590","Marvin and Dobson (1979)","Minimum age of metamorphic crystallization."]
["Dacite","Buckskin Gulch dacite","USGS(D)-HBD-4",-1.06128419867e+002,3.93160302064e+001,"Leadville","Climax","K/Ar","Biotite",69.900000,"1.7","69.9","Marvin and Dobson (1979)","Age slightly too old; dike cuts granodiorite which is 66.7 Ma."]
["Quartz monzonite","Humbug stock","USGS(D)-K150",-1.06104919126e+002,3.94499533652e+001,"Leadville","Breckenridge","K/Ar","Biotite",41.500000,"1","41.5","Marvin and Dobson (1979)",null]
["Leucogranite","Buckskin Gulch leucogranite","USGS(D)-LG-15",-1.06120674905e+002,3.93329856535e+001,"Leadville","Alma","K/Ar","Biotite",66.700000,"1.6","66.7","Marvin and Dobson (1979)",null]
["Melagranodiorite","Buckskin Gulch melagranodiorite","USGS(D)-MG-4",-1.06126388889e+002,3.93166666665e+001,"Leadville","Climax","K/Ar","Biotite",71.200000,"1.7","71.2","Marvin and Dobson (1979)",null]
["Carbonitite","Sloan diatreme","USGS(D)-SLOAN-2",-1.05456100000e+002,4.08424999999e+001,"Fort Collins","Haystack Gulch","K/Ar","Biotite",1350.000000,"30",null,"Marvin and Dobson (1979)",null]
["Granodiorite","Twin Lakes stock","USGS(D)-TL-F6-16",-1.06413611111e+002,3.90708333332e+001,"Leadville","Mount Elbert","FT","Zircon",45.500000,"5.1","45.5","Marvin and Dobson (1979)",null]
["Rhyolite porphyry","Unamed rhyolite","USGS(D)VA-217",-1.06061111111e+002,3.84916666665e+001,"Saguache","Poncha Pass","K/Ar","Whole-rock",90.000000,"3.1","90","Marvin and others (1989)","Age probably too old.  Poor location."]
["Basalt","Flattops area","26",-1.07050277777e+002,3.95311111115e+001,"Glenwood Springs","Cottonwood Pass","K/Ar","Whole-rock",11.400000,"1","11.1","Marvin and others (1974)",null]
["Rhyolite","Rabbit Ears Volcanics","43",-1.06258611111e+002,4.01758333332e+001,"Steamboat Springs","Gunsight Pass","FT","Zircon",30.800000,"2.8","30","Marvin and others (1974)","Location approximate."]
["Latite","Radial Mountain dike","53",-1.06095277778e+002,4.03438888890e+001,"Steamboat Springs","Radial Mountain","FT","Zircon",26.800000,"2.2","26.1","Marvin and others (1974)","Location approximate."]
["Latite","Haystack stock","55",-1.06233454394e+002,4.03164746820e+001,"Steamboat Springs","Parkview Mountain","K/Ar","Biotite",25.000000,"0.6","24.4","Marvin and others (1974)","Location approximate."]
["Quartz monzonite porphyry","Tucker Mountain quartz monzonite","90",-1.06173008364e+002,3.94578786873e+001,"Leadville","Copper Mountain","K/Ar","Biotite",43.900000,"2","42.8","Marvin and others (1974)","Age recalculated by Wallace (1993, 1995)."]
["Rhyolite porphyry","Tucker Mountain rhyolite porphyry","91",-1.06170147185e+002,3.94510615808e+001,"Leadville","Copper Mountain","K/Ar","Sanidine (?)",36.100000,"1.4","35.2","Marvin and others (1974)","Age recalculated by Wallace (1993, 1995)."]
["Quartz monzonite porphyry","Humbug stock","92",-1.06166818585e+002,3.94436819043e+001,"Leadville","Copper Mountain","K/Ar","Biotite",44.700000,"2.1","43.6","Marvin and others (1974)",null]
["Quartz monzonite","Humbug stock","93",-1.06162500000e+002,3.94444444449e+001,"Leadville","Copper Mountain","K/Ar","Biotite",35.900000,"1.4","35","Marvin and others (1974)","Age recalculated by Wallace (1993,1995)."]
["Quartz monzonite porphyry","Humbug stock","94",-1.06138888889e+002,3.94444444449e+001,"Leadville","Copper Mountain","K/Ar","Biotite",48.000000,"2.2","46.8","Marvin and others (1974)","Age recalculated by Wallace (1993,1995)."]
["Quartz monzonite","Humbug stock","95",-1.06138888889e+002,3.94444444449e+001,"Leadville","Copper Mountain","K/Ar","Biotite",35.800000,"2","34.9","Marvin and others (1974)","Age recalculated by Wallace (1993,1995)."]
["Rhyolite","Chalk Mountain rhyolite","98",-1.06211111111e+002,3.93733333334e+001,"Leadville","Climax","K/Ar","Biotite",27.700000,"1.9","27","Marvin and others (1974)","Age recalculated by Wallace (1993, 1995)."]
["Granite",null,"162",-1.06783333333e+002,3.72666666666e+001,"Antonito","Blackhead Peak","K/Ar","Biotite",27.700000,"Not report","27","Marvin and others (1974)","Location approximate.  Analytical data not available."]
["Granite",null,"162",-1.06783333333e+002,3.72666666666e+001,"Antonito","Blackhead Peak","K/Ar","Biotite",22.000000,"Not report","21.4","Marvin and others (1974)","Location approximate.  Analytical data not available."]
["Quartz latite","Cropsy Mountain","181",-1.06600000000e+002,3.74083333333e+001,"Antonito","Summitville","K/Ar","Biotite",23.500000,"0.6","22.9","Marvin and others (1974)",null]
["Quartz latite","Cropsy Mountain","181",-1.06600000000e+002,3.74083333333e+001,"Antonito","Summitville","K/Ar","Sanidine",23.400000,"0.6","22.8","Marvin and others (1974)",null]
["Altered rock","South Mountain area","183",-1.06608333333e+002,3.74250000000e+001,"Antonito","Summitville","K/Ar","Alunite",22.900000,"0.5","22.3","Marvin and others (1974)",null]
["Altered rock","South Mountain area","183",-1.06608333333e+002,3.74250000000e+001,"Antonito","Summitville","K/Ar","Alunite",23.000000,"0.5","22.4","Marvin and others (1974)",null]
["Tuff","Wall Mountain Tuff","198",-1.06059646008e+002,3.86537118850e+001,"Gunnison","Nathrop","K/Ar","Sanidine",36.300000,"1.1","35.4","Marvin and others (1974)","Location approximate."]
["Tuff","Wall Mountain Tuff","198",-1.06059343747e+002,3.86538338411e+001,"Gunnison","Nathrop","K/Ar","Biotite",38.300000,"1.9","37.3","Marvin and others (1974)","Location approximate."]
["Perlite","Nathrop Volcanics","199",-1.06066666667e+002,3.87499999996e+001,"Gunnison","Nathrop/Buena Vista East","K/Ar","Obsidian",30.100000,"1.5","29.3","Marvin and others (1974)","Location approximate."]
["Rhyolite","Nathrop Volcanics","200",-1.06077777778e+002,3.87555555551e+001,"Gunnison","Buena Vista East","K/Ar","Sanidine",28.700000,"0.8","28","Marvin and others (1974)",null]
["Rhyolite","Nathrop Volcanics","201",-1.06076388889e+002,3.87638888889e+001,"Gunnison","Buena Vista East","K/Ar","Sanidine",29.900000,"0.9","29.1","Marvin and others (1974)",null]
["Unnamed","Upper Buckskin Gulch stock","203",-1.06129344968e+002,3.93148458479e+001,"Leadville","Climax","K/Ar","Biotite",65.600000,"Not report","64","Marvin and others (1974)",null]
["Andesite","Thirtynine Mile Andesite, upper member","206",-1.05538333333e+002,3.88380555558e+001,"Pikes Peak","Thirtynine Mile Mountain","K/Ar","Whole-rock",35.000000,"1.1","34.1","Marvin and others (1974)","Location approximate."]
["Phonolite","Phonolite of Cripple Creek","212",-1.05211620072e+002,3.87576597960e+001,"Pikes Peak","Cripple Creek North","K/Ar","Sanidine",28.600000,"0.7","27.9","Marvin and others (1974)","Location approximate."]
["Phonolite","Phonolite of Cripple Creek","212",-1.05211619790e+002,3.87575644202e+001,"Pikes Peak","Cripple Creek North","K/Ar","Sanidine",30.100000,"0.7","29.3","Marvin and others (1974)","Location approximate."]
["Tuff","Gribbles Park Tuff","216",-1.05578888889e+002,3.85247222225e+001,"Pikes Peak","Hall Gulch","K/Ar","Sanidine",35.700000,"1.4","34.8","Marvin and others (1974)","Sample probably contaminated with Precambrian detritus.  Location approximate."]
["Andesite","Andesite of Waugh Mountain","217",-1.05582782850e+002,3.85008329280e+001,"Pikes Peak","Hall Gulch","K/Ar","Whole-rock",19.400000,"1.2","18.9","Marvin and others (1974)","Location approximate."]
["Tuff","Gribbles Park Tuff","220",-1.05599873835e+002,3.82640945130e+001,"Canon City","Hillside","K/Ar","K-feldspar",34.500000,"1.1","33.6","Marvin and others (1974)","Location approximate."]
["Tuff","Round Mountain, Silver Cliff","223",-1.05427222223e+002,3.81437500000e+001,"Canon City","Westcliffe","K/Ar","Biotite",85.600000,"3.8","83.5","Marvin and others (1974)","Age too old; concentrate probably contaminated with older material.  Location approximate."]
["Trachyte","stock of Game Ridge","225",-1.05320833333e+002,3.81083333333e+001,"Canon City","Rosita","K/Ar","Whole-rock",34.100000,"0.9","33.2","Marvin and others (1974)","Age probably too old due to xenocrysts.  Location approximate."]
["Andesite","Andesite, east Flank of Sangre de Cristo Mountains","229",-1.05454166667e+002,3.79499999999e+001,"Blanca Peak","Beck Mountain","K/Ar","Feldspar-quartz",42.300000,"1.2","41.2","Marvin and others (1974)","Age probably too old."]
["Granite","Zapata Creek area","230",-1.05525000000e+002,3.76416666669e+001,"Blanca Peak","Zapata Ranch","K/Ar","Biotite",65.700000,"2.3","64.1","Marvin and others (1974)",null]
["Granite","Zapata Creek area","231",-1.05512500000e+002,3.76263888890e+001,"Blanca Peak","Zapata Ranch","K/Ar","Biotite",56.600000,"2.6","55.2","Marvin and others (1974)","Location approximate."]
["Latite","Zapata Creek area","232",-1.05541666667e+002,3.76166666666e+001,"Blanca Peak","Twin Peaks","K/Ar","Biotite-amphibole",51.400000,"4.2","50.1","Marvin and others (1974)",null]
["Granite","Blanca Peak pluton","233",-1.05553590939e+002,3.75518174921e+001,"Blanca Peak","Twin Peaks","K/Ar","Biotite",33.000000,"0.8","32.2","Marvin and others (1974)","Location approximate."]
["Quartz monzonite","Sill, west of Sheep Mountain","234",-1.05230929881e+002,3.76823841265e+001,"Blanca Peak","Little Sheep Mountain","K/Ar","Biotite",38.400000,"2","37.4","Marvin and others (1974)","Location approximate."]
["Vitric tuff","In Devil's Hole Formation","235",-1.05233333333e+002,3.79583333337e+001,"Blanca Peak","Bear Creek","K/Ar","Whole-rock, non-magnetic fraction",116.000000,"8","113","Marvin and others (1974)","Age questionable due to probable contamination with older material.  Location approximate."]
["Andesite","In Devil's Hole Formation","236",-1.05225000000e+002,3.79666666665e+001,"Blanca Peak","Bear Creek","K/Ar","Biotite (impure)",39.200000,"1.5","38.2","Marvin and others (1974)","Age probably too old.  Location approximate."]
["Porphyry","Pando Porphyry","4233",-1.06227777778e+002,3.92249999997e+001,"Leadville","Mount Sherman","K/Ar","Sericite",61.500000,"Not report","60","Marvin and others (1974)","Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","#1-3-1",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",22.500000,"Not report","21.9","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","#1-4-1",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",22.600000,"Not report","22","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","#1-5-1",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",20.400000,"Not report","19.9","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","#1-5-2",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",18.000000,"Not report","17.5","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","#1-6-1",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",21.600000,"Not report","21","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","#1-7-1",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",22.900000,"Not report","22.3","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","#1-8-1",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",21.100000,"Not report","20.6","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","10A",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",23.600000,"Not report","23","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","16A",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",24.600000,"Not report","24","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Basalt","Yarmony Mountain","16A",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",25.700000,"Not report","25","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Porphyry","Porphyry at Hahns Peak","1A",-1.06917222223e+002,4.08355555557e+001,"Walden","Hahns Peak","K/Ar","Sanidine",10.300000,"0.3","10","Marvin and others (1974)",null]
["Porphyry","Porphyry at Hahns Peak","1A",-1.06917222223e+002,4.08355555557e+001,"Walden","Hahns Peak","K/Ar","Sanidine",9.100000,"0.4","8.9","Marvin and others (1974)",null]
["Porphyry","Porphyry at Hahns Peak","1A",-1.06917222223e+002,4.08355555557e+001,"Walden","Hahns Peak","K/Ar","Sanidine",10.500000,"0.6","10.2","Marvin and others (1974)",null]
["Porphyry","Porphyry at Hahns Peak","1A",-1.06917222223e+002,4.08355555557e+001,"Walden","Hahns Peak","K/Ar","Sanidine",11.900000,"0.7","11.6","Marvin and others (1974)",null]
["Porphyry","Porphyry at Hahns Peak","1A",-1.06917222223e+002,4.08355555557e+001,"Walden","Hahns Peak","K/Ar","Sanidine",10.600000,"0.4","10.3","Marvin and others (1974)",null]
["Porphyry","Porphyry at Hahns Peak","1A",-1.06917222223e+002,4.08355555557e+001,"Walden","Hahns Peak","K/Ar","Sanidine",10.500000,"0.6","10.2","Marvin and others (1974)",null]
["Porphyry","Porphyry at Hahns Peak","1A",-1.06917222223e+002,4.08355555557e+001,"Walden","Hahns Peak","K/Ar","Sanidine",9.600000,"0.4","9.4","Marvin and others (1974)",null]
["Quartz andesite","Porphyry at Hahns Peak","1C",-1.06929166667e+002,4.08416666665e+001,"Walden","Hahns Peak","K/Ar","Biotite",11.000000,"0.4","10.7","Marvin and others (1974)",null]
["Quartz andesite","Porphyry at Hahns Peak","1C",-1.06929166667e+002,4.08416666665e+001,"Walden","Hahns Peak","K/Ar","Sanidine",11.800000,"0.4","11.5","Marvin and others (1974)",null]
["Quartz monzonite(?)","Caribou stock","458",-1.05581900000e+002,3.99777999999e+001,"Denver West","Nederland","FT","Zircon",62.600000,"6.3",null,"Marvin and others (1974)",null]
["Basalt","Yarmony Mountain","4A",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",24.900000,"Not report","24.3","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Rhyolite","Wall Mountain Tuff","5-70-1",-1.05579166667e+002,3.86166666666e+001,"Pikes Peak","Hall Gulch","K/Ar","Sanidine",35.600000,"0.7","34.7","Marvin and others (1974)","Location approximate."]
["Syenodiorite","Spanish Peaks radial dike swarm","641-c",-1.04998275925e+002,3.73253506117e+001,"Alamosa","Cucharas Pass","FT","Apatite",21.500000,"3","21.5 ± 3.0","Marvin and others (1974)","Age may be in error due to large number of crystal defects within apatite."]
["Rhyolite","Ash in Troublesome Formation","65G57",-1.06298611111e+002,4.00333333331e+001,"Steamboat Springs","Junction Butte","FT","Zircon",13.100000,"2.3","12.8","Marvin and others (1974)","Location approximate."]
["Basalt","Conejos Formation","66L-26",-1.06216666666e+002,3.71500000002e+001,"Antonito","Vicente Canyon","K/Ar","Whole-rock",27.500000,"0.8","26.8","Marvin and others (1974)",null]
["Basalt","Conejos Formation","66L-30",-1.06233333333e+002,3.71500000002e+001,"Antonito","Vicente Canyon","K/Ar","Whole-rock",24.900000,"0.8","24.3","Marvin and others (1974)",null]
["Basalt","Conejos Formation","66L-36",-1.06200000000e+002,3.72166666667e+001,"Antonito","Vicente Canyon","K/Ar","Whole-rock",4.700000,"0.26","4.6","Marvin and others (1974)",null]
["Basalt","Conejos Formation","66L-98",-1.06183333333e+002,3.73833333330e+001,"Antonito","Fulcher Gulch","K/Ar","Whole-rock",19.300000,"0.4","18.8","Marvin and others (1974)",null]
["Rhyolite","Wall Mountain Tuff","68-0-39",-1.05304166666e+002,3.89416666671e+001,"Pikes Peak","Lake George","K/Ar","Biotite",36.600000,"0.8","35.7","Marvin and others (1974)","Location approximate."]
["Rhyolite","Wall Mountain Tuff","68-0-39",-1.05304166666e+002,3.89416666671e+001,"Pikes Peak","Lake George","K/Ar","Sanidine",37.100000,"0.8","36.2","Marvin and others (1974)","Location approximate."]
["Tuff","Gribbles Park Tuff","68-0-40",-1.05747463846e+002,3.86425095736e+001,"Pikes Peak","Black Mountain","K/Ar","Biotite",34.500000,"0.7","33.6","Marvin and others (1974)","Location approximate."]
["Tuff","Gribbles Park Tuff","68-0-40",-1.05747486328e+002,3.86424916520e+001,"Pikes Peak","Black Mountain","K/Ar","Sanidine",34.600000,"0.8","33.7","Marvin and others (1974)","Location approximate."]
["Ash flow","Gribbles Park Tuff","68-0-42",-1.05550000000e+002,3.84833333336e+001,"Canon City","Echo","K/Ar","Sanidine",29.300000,"0.6","28.6","Marvin and others (1974)",null]
["Ash flow","Gribbles Park Tuff","68-0-42",-1.05550000000e+002,3.84833333336e+001,"Canon City","Echo","K/Ar","Sanidine",30.300000,"0.7","29.5","Marvin and others (1974)",null]
["Tuff","Tuff in conglomerate of Fear Creek","68-0-43",-1.05550000000e+002,3.84833333336e+001,"Canon City","Echo","K/Ar","Hornblende",29.500000,"0.9","28.8","Marvin and others (1974)",null]
["Tuff","Tuff in conglomerate of Fear Creek","68-0-43",-1.05550000000e+002,3.84833333336e+001,"Canon City","Echo","K/Ar","Biotite",28.400000,"0.6","27.7","Marvin and others (1974)",null]
["Tuff","Tuff in conglomerate of Fear Creek","68-0-43",-1.05550000000e+002,3.84833333336e+001,"Canon City","Echo","K/Ar","Sanidine",27.500000,"0.6","26.8","Marvin and others (1974)",null]
["Tuff","Tuff in conglomerate of Fear Creek","68-0-43",-1.05550000000e+002,3.84833333336e+001,"Canon City","Echo","K/Ar","Sanidine",28.500000,"0.6","27.8","Marvin and others (1974)",null]
["Rhyolite","Ash in Troublesome Formation","68G105",-1.06373888889e+002,4.00872222226e+001,"Steamboat Springs","Junction Butte","FT","Zircon",11.500000,"1.8","11.2","Marvin and others (1974)","Location approximate."]
["Basalt","Conejos Formation","68L-134I",-1.06166666667e+002,3.70499999996e+001,"Antonito","Fox Creek","K/Ar","Whole-rock",4.500000,"0.22","4.4","Marvin and others (1974)",null]
["Basalt","Conejos Formation","68L-16A",-1.06200000000e+002,3.71500000002e+001,"Antonito","Vicente Canyon","K/Ar","Whole-rock",20.300000,"0.6","19.8","Marvin and others (1974)",null]
["Rhyolite flow","Neversummer Range, west of Shadow Mountains reservoir","71G 103",-1.05887500000e+002,4.02389000001e+001,"Estes Park","Trail Mountain","FT","Zircon",25.500000,"2.4",null,"Marvin and others (1974)",null]
["Pumice","Devils Hole Formation","71-S-2",-1.05304166666e+002,3.80747222219e+001,"Canon City","Rosita","K/Ar","Biotite",32.900000,"0.9","32.1","Marvin and others (1974)","Location approximate."]
["Latite porphyry","Green Mountain sill","72N2",-1.06321388889e+002,3.98786111113e+001,"Vail","King Creek","FT","Zircon",29.900000,"2.4","29.9 ± 2.4","Marvin and others (1974)",null]
["Rhyolite","Plug on Porphyry Peak","72N6",-1.05937500000e+002,4.02791666664e+001,"Estes Park","Bowen Mountain","FT","Zircon",25.400000,"2.3","25.4 ± 2.3","Marvin and others (1974)",null]
["Dacite","East of Hahns Peak","7K",-1.06886111111e+002,4.08658333335e+001,"Walden","Hahns Peak","K/Ar","Sanidine",10.600000,"0.3","10.3","Marvin and others (1974)",null]
["Basalt","Yarmony Mountain","8A",-1.06641666667e+002,3.99083333330e+001,"Vail","McCoy","K/Ar","Whole-rock",23.600000,"Not report","23","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Audubon stock","Audubon stock, west","AOA",-1.05616700000e+002,4.00721999996e+001,"Estes Park","Ward","K/Ar","Biotite",71.700000,"2",null,"Marvin and others (1974)",null]
["Quartz latite","Dike, north of Fourmile Canyon","B1379",-1.05324317956e+002,4.00345653611e+001,"Estes Park","Boulder","K/Ar","Biotite",66.200000,"2.2",null,"Marvin and others (1974)","Dike"]
["Monzonite porphyry","Stock, south of Left Hand Creek","B1382",-1.05328300000e+002,4.00950000002e+001,"Estes Park","Boulder","K/Ar","Hornblende",46.600000,"1.00",null,"Marvin and others (1974)",null]
["Quartz latite","Dike, west of Boulder","B204",-1.05303600000e+002,4.00221999998e+001,"Estes Park","Boulder","K/Ar","Biotite",67.000000,"2.2",null,"Marvin and others (1974)","Dike"]
["Quartz latite","Dike, north of Left Hand Creek","B743",-1.05351900000e+002,4.01071999996e+001,"Estes Park","Boulder","K/Ar","Biotite",65.800000,"2.2",null,"Marvin and others (1974)","Dike"]
["Granodiorite","Whitehorn stock","CM-201",-1.05933888889e+002,3.86902777782e+001,"Pikes Peak","Cameron Mountain","K/Ar","Biotite",71.800000,"2.6","70","Marvin and others (1974)",null]
["Granodiorite","Missouri Creek stock","D-6",-1.06483333333e+002,3.93874999999e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",64.600000,"3","63","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Granodiorite","Missouri Creek stock","D-7",-1.06481944445e+002,3.93861111112e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",65.600000,"3","64","Marvin and others (1974)","Location approximate.  Age recalculated by Wallace (1993, 1995)."]
["Latite","Haystack stock","DK-2",-1.06188888889e+002,4.03274999996e+001,"Steamboat Springs","Parkview Mountain","FT","Zircon",28.400000,"3.8","27.7","Marvin and others (1974)","Location approximate."]
["Latite","Flagstaff Mountain sill","Flag 28-65",-1.05297200000e+002,4.00030999997e+001,"Estes Park","Boulder","K/Ar","Biotite",66.200000,"2.4",null,"Marvin and others (1974)",null]
["Latite","Northwest of Hahns Peak","KA1846",-1.07047222222e+002,4.08833333335e+001,"Craig","Shield Mountain","K/Ar","Biotite",7.800000,"0.4","7.6","Marvin and others (1974)","Location approximate."]
["Latite","Poison Creek stock area","Kit-8",-1.06240435249e+002,4.03216093198e+001,"Steamboat Springs","Parkview Mountain","FT","Zircon",23.400000,"1.8","22.8","Marvin and others (1974)","Location approximate."]
["Quartz monzonite","Hahns Peak stock","L-1030",-1.06975000000e+002,4.08416666665e+001,"Walden","Hahns Peak","K/Ar","Biotite",9.700000,"0.3","9.5","Marvin and others (1974)",null]
["Whitehorn stock","Whitehorn stock","L-1035",-1.05950000000e+002,3.86333333332e+001,"Pikes Peak","Cameron Mountain","K/Ar","Hornblende",71.200000,"2.1","69.4","Marvin and others (1974)","Location approximate."]
["Whitehorn stock","Whitehorn stock","L-1035",-1.05950000000e+002,3.86333333332e+001,"Pikes Peak","Cameron Mountain","K/Ar","Biotite",72.200000,"2.1","70.4","Marvin and others (1974)","Location approximate."]
["Syenite","Syenite of Cripple Creek","L-945",-1.05127777778e+002,3.87291666670e+001,"Pikes Peak","Cripple Creek South","K/Ar","Aegirine",34.300000,"1","33.4","Marvin and others (1974)","Location approximate."]
["Syenite","Syenite of Cripple Creek","L-945",-1.05127777778e+002,3.87291666670e+001,"Pikes Peak","Cripple Creek South","K/Ar","Aegirine",34.700000,"1.3","33.8","Marvin and others (1974)","Location approximate."]
["Rhyolite","Florissant Lake Beds","OHM-65-01",-1.05291666667e+002,3.89166666667e+001,"Pikes Peak","Lake George","K/Ar","Sanidine",35.000000,"0.8","34.1","Marvin and others (1974)","Location approximate."]
["Andesite","Thirtynine Mile upper andesite","OHM-65-02",-1.05281944444e+002,3.88902777777e+001,"Pikes Peak","Lake George","K/Ar","Plagioclase",30.300000,"1.5","29.5","Marvin and others (1974)","Location approximate."]
["Mafic latite","Ralston sill","R-14",-1.05239700000e+002,3.98241999999e+001,"Denver West","Golden","K/Ar","Whole-rock",63.500000,"2.5",null,"Marvin and others (1974)",null]
["Rhyolite","Silver Cliff rhyolite","R4226",-1.05450000000e+002,3.81333333337e+001,"Canon City","Westcliffe","Rb-Sr","Glass",39.000000,"13","40 ± 13","Marvin and others (1974)","Model age.  Location approximate."]
["Tonalite","Rito Alto stock","RA-3-70",-1.05743888889e+002,3.82244444443e+001,"Canon City","Electric Peak","FT","Sphene",31.800000,"2.3","31.8 ± 2.3","Marvin and others (1974)","Location approximate."]
["Tonalite","Rito Alto stock","RA-3-70",-1.05743888889e+002,3.82244444443e+001,"Canon City","Electric Peak","FT","Zircon",27.100000,"3.2","27.1 ± 3.2","Marvin and others (1974)","Location approximate."]
["Rhyolite","Rhyolite of Antrim Lode","SC-594",-1.05325000000e+002,3.81527777776e+001,"Canon City","Mount Tyndall","K/Ar","Sanidine",27.000000,"0.7","26.3","Marvin and others (1974)","Location approximate."]
["Rhyolite","Rhyolite of Antelope Butte","SC-595",-1.05297845522e+002,3.80582514286e+001,"Canon City","Rosita","K/Ar","Sanidine",28.000000,"0.8","27.3","Marvin and others (1974)","Location approximate."]
["Tuff","Badger Creek Tuff","SM-5-72",-1.05986666666e+002,3.88183333337e+001,"Pikes Peak","Castle Rock Gulch","FT","Zircon",31.800000,"3.5","31.8 ± 3.5","Marvin and others (1974)","Location approximate."]
["Mafic schlieren","Twin Lakes stock","TL-F-6-16",-1.06403055556e+002,3.90705555560e+001,"Leadville","Mount Elbert","FT","Sphene",39.200000,"4.2","39.2 ± 4.2","Marvin and others (1974)",null]
["Mafic schlieren","Twin Lakes stock","TL-F-6-16",-1.06403055556e+002,3.90705555560e+001,"Leadville","Mount Elbert","FT","Zircon",45.500000,"5","45.5","Marvin and others (1974)",null]
["Ash flow","south of Rosita","TRT-1-72",-1.05339721482e+002,3.80650971524e+001,"Canon City","Rosita","FT","Zircon",27.500000,"2.8","27.5 ± 2.8","Marvin and others (1974)","Location approximate."]
["Trachyandesite","Rawley Andesite","V-567",-1.06123611111e+002,3.84208333331e+001,"Saguache","Poncha Pass","K/Ar","Whole-rock",32.600000,"1.1","31.8","Marvin and others (1974)",null]
["Latite","Squirrel Gulch Latite (?)","V-998",-1.06100000000e+002,3.84552777778e+001,"Saguache","Poncha Pass","K/Ar","Biotite",34.100000,"1.3","33.2","Marvin and others (1974)",null]
["Latite","Squirrel Gulch Latite (?)","V-998",-1.06100000000e+002,3.84552777778e+001,"Saguache","Poncha Pass","K/Ar","Plagioclase",34.600000,"2.1","33.7","Marvin and others (1974)",null]
["Latite","Squirrel Gulch Latite (?)","V-999",-1.06118333333e+002,3.84394444446e+001,"Saguache","Poncha Pass","K/Ar","Plagioclase",35.100000,"1.6","34.2","Marvin and others (1974)",null]
["Monzonite","Empire stock",null,-1.05716700000e+002,3.97666999996e+001,"Denver West","Empire","K/Ar","Hornblende",54.600000,"Not report",null,"Marvin and others (1974)",null]
["Diorite-monzonite stock","Possibly Long Gulch stock",null,-1.05450000000e+002,4.00332999997e+001,"Estes Park","Gold Hill","K/Ar","Hornblende",45.100000,"Not report",null,"Marvin and others (1974)","No rock of this composition shown at this location on detailed map.  Possibly Long Gulch stock 1.5 mi NE."]
["Granodiorite","Jamestown Stock",null,-1.05378987446e+002,4.01160030151e+001,"Estes Park","Boulder","K/Ar","Biotite",55.900000,"1.9",null,"Marvin and others (1974)",null]
["Granodiorite","Jamestown Stock",null,-1.05379111636e+002,4.01160026086e+001,"Estes Park","Boulder","FT","Zircon",51.100000,"4.2",null,"Marvin and others (1974)",null]
["Basaltic andesite","Flattops area",null,-1.07175555556e+002,3.98786111113e+001,"Glenwood Springs","Trappers Lake","K/Ar","Whole-rock",12.700000,"0.5","12.4","Marvin and others (1974)","No sample number reported."]
["Hornblende quartz latite porphyry","Rustic Dike","D-1",-1.05621700000e+002,4.07310999999e+001,"Fort Collins","Rustic","K/Ar","Hornblende",56.000000,"1.1",null,"Marvin and others (1974); Bole (1971)",null]
["Rhyolite","Plug on Porphyry Peak","72N7",-1.05937500000e+002,4.02791999998e+001,"Estes Park","Bowen Mountain","FT","Zircon",24.900000,"2",null,"Marvin and others (1974); Braddock and Cole (1990)",null]
["Granodiorite","Mount Richtofen stock","305B",-1.05900000000e+002,4.04500000004e+001,"Estes Park","Mount Richthofen","K/Ar","Biotite",28.700000,"3",null,"Marvin and others (1974); Corbett (1968)",null]
["Quartz latite flow","Ash flow south of Cameron Pass, Neversummer Volcanics","307B",-1.05858300000e+002,4.04667000004e+001,"Estes Park","Fall River Pass","K/Ar","Biotite",28.700000,"3",null,"Marvin and others (1974); Corbett (1968)",null]
["Basalt","Flow in lowest part of Troublesome Formation","72G-42",-1.05943407480e+002,4.01459034419e+001,"Estes Park","Trail Mountain","K/Ar","Whole-rock",26.800000,"0.40",null,"Marvin and others (1974); Izett (1974)",null]
["Rhyolitic ash fall","Lowest part of Troublesome Formation","72G-52",-1.05952769970e+002,4.01435511455e+001,"Estes Park","Trail Mountain","FT","Zircon",22.700000,"2.3",null,"Marvin and others (1974); Izett (1974)",null]
["Latite","Plug intrudes basal Troublesome Formation",null,-1.05938300000e+002,4.02227999999e+001,"Estes Park","Trail Mountain","FT","Zircon",28.400000,"2.3",null,"Marvin and others (1974); Izett (1974)","Date originally reported as 27.6 Ma.  Recalculated gy Braddock and Cole (1990)."]
["Monzonite","Caribou stock","75CS69",-1.05579200000e+002,3.99828000002e+001,"Denver West","Nederland","K/Ar","Biotite",65.500000,"2.4",null,"Marvin and others (1989)",null]
["Quartz monzonite","Caribou stock","75CS78",-1.05587240318e+002,3.99772221603e+001,"Denver West","Nederland","K/Ar","Hornblende",68.200000,"4.1",null,"Marvin and others (1989)",null]
["Granodiorite","Montezuma stock","75CS84A",-1.05915300000e+002,3.96050000003e+001,"Denver West","Keystone","K/Ar","Biotite",37.900000,"1.4",null,"Marvin and others (1989)",null]
["Granodiorite","Empire stock","75CS88",-1.05669700000e+002,3.97602999996e+001,"Denver West","Empire","K/Ar","Biotite",61.600000,"2.2",null,"Marvin and others (1989)",null]
["Monzogranite","Intrusive rocks of Treasure Vault Lake","83P100",-1.06521388889e+002,3.94091666668e+001,"Leadville","Mount Jackson","K/Ar","Biotite",64.000000,"2.3","64","Marvin and others (1989)",null]
["Granitic gneiss","Metavolcanic gneiss","USGS(D)1028",-1.06632777778e+002,4.09872222220e+001,"Walden","Davis Peak","U-Pb","Zircon",1576.000000,"18","1576","Marvin and others (1989)","207Pb/206Pb age; considered too young as geologic relationships require an age of at least 1,800 Ma."]
["Quartz monzonite","Swan Mountain sill","USGS(D)75CS86",-1.06038888889e+002,3.95911111110e+001,"Vail","Frisco","K/Ar","Biotite",44.100000,"1.6","44.1","Marvin and others (1989)",null]
["Quartz diorite","Quartz Creek stock","USGS(D)BMG-1QC",-1.06754389438e+002,3.73945818308e+001,"Antonito","Wolf Creek Pass","FT","Zircon",24.300000,"2.8","24.3","Marvin and others (1989)","Core from Benson-Montin-Greer No. 1 Quartz Creek well."]
["Rhyolite porphyry intrusion","Pando Porphyry, Granite area","USGS(D)G-A-82",-1.06255277778e+002,3.90638888890e+001,"Leadville","Granite","K/Ar","Whole-rock",65.300000,"2.4","65.3","Marvin and others (1989)",null]
["Rhyolite porphyry intrusion","Rough and Tumbling stock","USGS(D)JH-9-82",-1.06108333333e+002,3.90361111113e+001,"Leadville","Jones Hill","K/Ar","Biotite",61.400000,"2.2","61.4","Marvin and others (1989)",null]
["Hornblende andesite","Ring andesite, Rosita","USGS(D)S69-404",-1.05375599711e+002,3.80826160157e+001,"Canon City","Aldrich Gulch","K/Ar","Biotite",27.400000,"0.8","27.4","Marvin and others (1989)","Biotite concentrate probably altered or impure as indicated by low K content."]
["Andesitic tuff","Badger Creek Tuff","USGS(D)SBNM-1",-1.05933333333e+002,3.88222222225e+001,"Pikes Peak","Castle Rock Gulch","K/Ar","Biotite",36.300000,"0.9","36.3","Marvin and others (1989)",null]
["Andesitic tuff","Badger Creek Tuff","USGS(D)SBNM-1",-1.05933333333e+002,3.88222222225e+001,"Pikes Peak","Castle Rock Gulch","K/Ar","Hornblende",37.400000,"0.7","37.4","Marvin and others (1989)",null]
["Diabasic diorite","Dioritic phase of gabbro of Elkhorn Mountain","USGS(D)SS1",-1.07043055555e+002,4.09902777775e+001,"Craig","Shield Mountain","U-Pb","Zircon",1781.000000,"20","1781","Marvin and others (1989)","207Pb/206Pb age; approximates time of emplacement of the pluton."]
["Rhyolite porphyry","Unnamed Rhyolite","USGS(D)V-866",-1.06069444444e+002,3.84930555551e+001,"Saguache","Poncha Pass","K/Ar","Whole-rock",69.700000,"2.4","69.7","Marvin and others (1989)","Poor location."]
["Quartz monzonite","Methodist Mountain","USGS(D)V-997",-1.06015000000e+002,3.84527777777e+001,"Saguache","Poncha Pass","K/Ar","Biotite",1290.000000,"50","1290","Marvin and others (1989)","Considered to be a minimum age."]
["Quartz latite","Intrusive breccia, East Lake Creek","W3127",-1.06575000000e+002,3.94577777780e+001,"Leadville","Mount Jackson","K/Ar","Biotite",62.200000,"1.7","62.2","Marvin and others (1989)",null]
["Biotite granodiorite","Rawah pluton","USGS(D)-KC438",-1.05939200000e+002,4.08152999997e+001,"Fort Collins","Glendevey","Rb-Sr","Whole-rock",1689.000000,"Not report",null,"McCallum and Hedge (1976)",null]
["Flow banded rhyolite","Rhyolite flow, east of Manhattan","USGS(D)-5-39A",-1.05539200000e+002,4.07255999999e+001,"Fort Collins","Rustic","FT","Zircon",33.300000,"6.7",null,"McCallum and Naeser (1977)",null]
["Quartz-rich dacite porphyry","Manhattan dike swarm","USGS(D)-5-43",-1.05566400000e+002,4.07225000000e+001,"Fort Collins","Rustic","FT","Zircon",57.200000,"6",null,"McCallum and Naeser (1977)",null]
["Quartz-rich dacite porphyry","Manhattan dike swarm","USGS(D)-5-44",-1.05570800000e+002,4.07221999997e+001,"Fort Collins","Rustic","FT","Zircon",58.700000,"5.8",null,"McCallum and Naeser (1977)",null]
["Porphyritic rhyodacite","Manhattan dike swarm","USGS(D)-73N1",-1.05518900000e+002,4.06931000001e+001,"Fort Collins","Rustic","FT","Zircon",57.900000,"5.2",null,"McCallum and Naeser (1977)",null]
["Dacite porphyry","Manhattan dike swarm","USGS(D)-73N2",-1.05596900000e+002,4.07149999996e+001,"Fort Collins","Rustic","FT","Zircon",60.200000,"4.9",null,"McCallum and Naeser (1977)",null]
["Porphyritic rhyodacite to quartz latite","Manhattan dike swarm","USGS(D)-73N3",-1.05590069105e+002,4.07167549196e+001,"Fort Collins","Rustic","FT","Zircon",56.400000,"5",null,"McCallum and Naeser (1977)",null]
["Sodic, quartz-rich dacite porphyry","Manhattan dike swarm","USGS(D)-73N4",-1.05581700000e+002,4.07263999999e+001,"Fort Collins","Rustic","FT","Zircon",54.000000,"5.8",null,"McCallum and Naeser (1977)",null]
["Porphyritic hornblende dacite","Manhattan dike swarm","USGS(D)-73N5",-1.05602502801e+002,4.07343761788e+001,"Fort Collins","Rustic","FT","Zircon",53.600000,"5.2",null,"McCallum and Naeser (1977)",null]
["Granodiorite","Jamestown stock","L-1031",-1.05400000000e+002,4.01166999996e+001,"Estes Park","Gold Hill","K/Ar","Hornblende",79.600000,"2.3",null,"McDowell (1971)",null]
["Granodiorite","Jamestown stock","L-1031",-1.05400000000e+002,4.01166999996e+001,"Estes Park","Gold Hill","K/Ar","Hornblende",73.600000,"2.2",null,"McDowell (1971)",null]
["Granodiorite","Lincoln Porphyry","L-1125",-1.06225687647e+002,3.93153355215e+001,"Leadville","Climax","K/Ar","Biotite",66.300000,"1.9","64.7","McDowell (1971)","Location and age recalculation from Wallace (1993, 1995)."]
["Quartz monzonite","Montezuma stock","L-1032",-1.05900000000e+002,3.96000000000e+001,"Denver West","Keystone","K/Ar","Biotite",39.600000,"1.2",null,"McDowell (1971); Marvin and others (1974)",null]
["Quartz monzonite","Eldora stock","L-1124",-1.05588243464e+002,3.99504798638e+001,"Denver West","Nederland","K/Ar","Biotite",60.600000,"1.8",null,"McDowell (1971); Marvin and others (1974)",null]
["Tuff","Wall Mountain Tuff","1",-1.06058888889e+002,3.86547222220e+001,"Gunnison","Poncha Springs NE","40Ar/39Ar","Sanidine",36.700000,"0.04","36.7","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Florissant Formation","3",-1.05295833334e+002,3.89175000001e+001,"Pikes Peak","Lake George","40Ar/39Ar","Sanidine",34.000000,"0.13","34.03","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Florissant Formation","4",-1.05295833334e+002,3.89175000001e+001,"Pikes Peak","Lake George","40Ar/39Ar","Sanidine",34.100000,"0.12","34.14","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Florissant Formation","5",-1.05295833334e+002,3.89175000001e+001,"Pikes Peak","Lake George","40Ar/39Ar","Sanidine",34.000000,"0.13","4.01","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Latite","Latite of Waugh Mountain","101",-1.05759444444e+002,3.85819444447e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Hornblende",31.600000,"0.27","31.61","McIntosh and Chapin (2004)","Plateau age."]
["Latite","Latite of Waugh Mountain","101",-1.05759444444e+002,3.85819444447e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Matrix",31.700000,"0.21","31.74","McIntosh and Chapin (2004)","Plateau age."]
["Latite","Latite of Waugh Mountain","102",-1.05760686661e+002,3.85839982408e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Matrix",32.400000,"0.69","32.44","McIntosh and Chapin (2004)","Plateau age."]
["Andesite","Andesite of Waugh Mountain","103",-1.05756944444e+002,3.85822222219e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Matrix",31.300000,"0.21","31.28","McIntosh and Chapin (2004)","Plateau age."]
["Andesite","Andesitic intrusion at Guffey","201",-1.05521666667e+002,3.87513888891e+001,"Pikes Peak","Thirtynine Mile Mountain","40Ar/39Ar","Hornblende",38.100000,"2.92","38.12","McIntosh and Chapin (2004)","Llocation not given in source paper.  Guffey townsite used as location in order to plot on map.  Plateau age; considered to be inaccurate or imprecise."]
["Andesite","Andesitic intrusion at Guffey","202",-1.05521666667e+002,3.87513888891e+001,"Pikes Peak","Thirtynine Mile Mountain","40Ar/39Ar","Hornblende",36.100000,"0.49","36.06","McIntosh and Chapin (2004)","Location not given in source paper.  Guffey townsite used as location in order to plot on map.  Plateau age."]
["Andesite","Andesitic intrusion at Guffey","203",-1.05521666667e+002,3.87513888891e+001,"Pikes Peak","Thirtynine Mile Mountain","40Ar/39Ar","Hornblende",36.000000,"0.69","35.97","McIntosh and Chapin (2004)","Location not given in source paper.  Guffey townsite used as location in order to plot on map.  Plateau age."]
["Andesite","Andesitic intrusion at Guffey","204",-1.05521666667e+002,3.87513888891e+001,"Pikes Peak","Thirtynine Mile Mountain","40Ar/39Ar","Hornblende",36.900000,"1.59","36.92","McIntosh and Chapin (2004)","Location not given in source paper.  Guffey townsite used as location in order to plot on map.  Plateau age."]
["Tuff","Wall Mountain Tuff","531",-1.05819722222e+002,3.86797222224e+001,"Pikes Peak","Gribbles Park","40Ar/39Ar","Sanidine",36.600000,"0.11","36.61","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Badger Creek Tuff","534",-1.05957500000e+002,3.86144444446e+001,"Pikes Peak","Salida East","40Ar/39Ar","Sanidine",33.800000,"0.1","33.8","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Tuff of Stirrup Ranch","536",-1.05548611111e+002,3.85844444448e+001,"Pikes Peak","Hall Gulch","40Ar/39Ar","Sanidine",36.500000,"0.16","36.5","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Gribbles Park Tuff","537",-1.05779166667e+002,3.86091666671e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",32.900000,"0.11","32.91","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","East Gulch Tuff","538",-1.05565555556e+002,3.85305555553e+001,"Pikes Peak","Hall Gulch","40Ar/39Ar","Sanidine",33.700000,"0.15","33.69","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Thorn Ranch Tuff","539",-1.05562222222e+002,3.85302777781e+001,"Pikes Peak","Hall Gulch","40Ar/39Ar","Sanidine",33.600000,"0.14","33.59","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Antero Formation","540",-1.05486388889e+002,3.85422222225e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Sanidine",33.900000,"0.1","33.87","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Gribbles Park Tuff","541",-1.06271388889e+002,3.81549999996e+001,"Saguache","Lake Mountain NE","40Ar/39Ar","Sanidine",32.800000,"0.12","32.85","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","695",-1.06196666666e+002,3.81280555553e+001,"Saguache","Klondike Mine","40Ar/39Ar","Sanidine",34.200000,"1.21","34.19","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age; considered to be inaccurate.  Table 2 of McIntosh and Chapin (2004) indicates sample was plagioclase which is consistent with the K/Ca reported in their Appendix 5."]
["Tuff","Bonanza Tuff (lower)","695",-1.06196666666e+002,3.81280555553e+001,"Saguache","Klondike Mine","40Ar/39Ar","Biotite",33.200000,"0.12","33.21","McIntosh and Chapin (2004)","Plateau age; considered to be inaccurate or imprecise."]
["Tuff","Bonanza Tuff (lower)","696",-1.06198611111e+002,3.81291666668e+001,"Saguache","Klondike Mine","40Ar/39Ar","Sanidine",33.200000,"0.16","33.23","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Bonanza Tuff (lower)","696",-1.06198611111e+002,3.81291666668e+001,"Saguache","Klondike Mine","40Ar/39Ar","Biotite",33.400000,"0.17","33.41","McIntosh and Chapin (2004)","Plateau age; considered to be inaccurate or imprecise.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","697",-1.06198611111e+002,3.81300000002e+001,"Saguache","Klondike Mine","40Ar/39Ar","Sanidine",32.900000,"0.1","32.9","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","697",-1.06198611111e+002,3.81300000002e+001,"Saguache","Klondike Mine","40Ar/39Ar","Biotite",33.300000,"0.13","33.3","McIntosh and Chapin (2004)","Plateau age; considered to be inaccurate or imprecise.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","699",-1.06199722223e+002,3.81308333335e+001,"Saguache","Klondike Mine","40Ar/39Ar","Sanidine",32.900000,"0.09","32.89","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","699",-1.06199722223e+002,3.81308333335e+001,"Saguache","Klondike Mine","40Ar/39Ar","Biotite",33.200000,"0.24","33.24","McIntosh and Chapin (2004)","Plateau age; considered to be inaccurate or imprecise.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","700",-1.06268611111e+002,3.81552777777e+001,"Saguache","Lake Mountain NE","40Ar/39Ar","Sanidine",33.000000,"0.11","33.01","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","700",-1.06268611111e+002,3.81552777777e+001,"Saguache","Lake Mountain NE","40Ar/39Ar","Biotite",44.200000,"7.18","44.16","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Tuff","Bonanza Tuff (lower)","701",-1.06269444445e+002,3.81547222224e+001,"Saguache","Lake Mountain NE","40Ar/39Ar","Sanidine",32.800000,"0.11","32.83","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Badger Creek Tuff","702",-1.05818055555e+002,3.85958333331e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.800000,"0.12","33.81","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Badger Creek Tuff","703",-1.05818055555e+002,3.85969444446e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.800000,"0.14","33.82","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Badger Creek Tuff","705",-1.05818055555e+002,3.85983333332e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.800000,"0.13","33.83","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Badger Creek Tuff","706",-1.05818611111e+002,3.85986111113e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.800000,"0.13","33.8","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Latite","Latite of Badger Creek","707",-1.05819444445e+002,3.85994444447e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.700000,"0.12","33.68","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Antero Formation","708",-1.05795833333e+002,3.85880555555e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.900000,"0.14","33.87","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Antero Formation","709",-1.05794722223e+002,3.85894444442e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",64.000000,"0.25","33.96","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Antero Formation","710",-1.05794444444e+002,3.85900000004e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.700000,"0.12","33.75","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Gribbles Park Tuff","711",-1.05770833334e+002,3.85952777778e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",32.900000,"0.14","32.94","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Gribbles Park Tuff","712",-1.05768333334e+002,3.86066666670e+001,"Pikes Peak","Jack Hall Mountain","40Ar/39Ar","Sanidine",33.000000,"0.14","32.98","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Fish Canyon Tuff","779",-1.05568611111e+002,3.85005555555e+001,"Pikes Peak","Hall Gulch","40Ar/39Ar","Sanidine",27.700000,"0.14","27.71","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Florissant Formation","782",-1.05297222222e+002,3.89166666667e+001,"Pikes Peak","Lake George","40Ar/39Ar","Sanidine",34.100000,"0.12","34.07","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Florissant Formation","786",-1.05266132074e+002,3.88687045413e+001,"Pikes Peak","Wrights Reservoir","40Ar/39Ar","Sanidine",34.000000,"0.12","33.98","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","East Gulch Tuff","789",-1.05820240208e+002,3.84442808267e+001,"Canon City","Howard","40Ar/39Ar","Sanidine",33.900000,"0.19","33.9","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age; considered to be inaccurate or imprecise."]
["Tuff","Fish Canyon Tuff","790",-1.05799585130e+002,3.84276677381e+001,"Canon City","Howard","40Ar/39Ar","Sanidine",27.900000,"0.11","27.93","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Fish Canyon Tuff","791",-1.05791388889e+002,3.84083333334e+001,"Canon City","Howard","40Ar/39Ar","Sanidine",27.800000,"0.15","27.79","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Carpenter Ridge Tuff","792",-1.05792777778e+002,3.84097222220e+001,"Canon City","Howard","40Ar/39Ar","Sanidine",27.400000,"0.12","27.38","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Thorn Ranch Tuff","1130",-1.06274444445e+002,3.83852777778e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.500000,"0.12","33.54","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Thorn Ranch Tuff","1131",-1.06262777778e+002,3.83894444447e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.600000,"0.1","33.63","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Bentonitic ash","Pitch-Pinnacle Forrmation","1132",-1.06260277777e+002,3.83908333334e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Plagioclase",35.100000,"0.58","35.13","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age; considered to be inaccurate or imprecise.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Vitrophyre","Thorn Ranch Tuff","1133",-1.06275833333e+002,3.83852777778e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.700000,"0.22","33.75","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Badger Creek Tuff clast in Pitch-Pinnacle Formation","1134",-1.06342777778e+002,3.83716666666e+001,"Saguache","Chester","40Ar/39Ar","Sanidine",33.900000,"0.21","33.85","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Badger Creek Tuff clast in Pitch-Pinnacle Formation","1135",-1.06355277778e+002,3.83788888889e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.900000,"0.21","33.93","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Andesite","Badger Creek Tuff clast in Pitch-Pinnacle Formation","1136",-1.06355277778e+002,3.83869444446e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Plagioclase",34.100000,"0.59","34.11","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age; considered to be inaccurate or imprecise.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Pumice","Pitch-Pinnacle Forrmation","1137",-1.06318888889e+002,3.83874999999e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.400000,"0.25","33.38","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Pumice","Pitch-Pinnacle Forrmation","1138",-1.06318888889e+002,3.83874999999e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.700000,"0.1","33.72","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Pumice","Pitch-Pinnacle Forrmation","1140",-1.06318888889e+002,3.83874999999e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.700000,"0.37","33.75","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Bentonitic ash","Pitch-Pinnacle Forrmation","1141",-1.06310277778e+002,3.83916666667e+001,"Saguache","Pahlone Peak","40Ar/39Ar","Sanidine",33.700000,"0.22","33.67","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (upper)","1143",-1.06287222223e+002,3.83552777781e+001,"Saguache","Chester","40Ar/39Ar","Sanidine",32.800000,"0.2","32.81","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (upper)","1144",-1.06284722223e+002,3.83547222219e+001,"Saguache","Chester","40Ar/39Ar","Sanidine",32.800000,"0.19","32.79","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","East Gulch Tuff","1146",-1.05601106485e+002,3.82682214101e+001,"Canon City","Hillside","40Ar/39Ar","Sanidine",33.700000,"0.12","33.72","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Gribbles Park Tuff","1147",-1.05591111112e+002,3.82694444449e+001,"Canon City","Hillside","40Ar/39Ar","Sanidine",33.000000,"0.2","32.95","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Thorn Ranch Tuff","1148",-1.05594166667e+002,3.82694444449e+001,"Canon City","Hillside","40Ar/39Ar","Sanidine",33.700000,"0.09","33.73","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Thorn Ranch Tuff","1149",-1.05593888889e+002,3.82691666668e+001,"Canon City","Hillside","40Ar/39Ar","Sanidine",33.500000,"0.2","33.49","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Sandstone","Antero Formation","1150",-1.05593184334e+002,3.82707232979e+001,"Canon City","Hillside","40Ar/39Ar","Sanidine",33.600000,"0.19","33.65","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Thorn Ranch Tuff","1151",-1.05717500000e+002,3.83355555552e+001,"Canon City","Cotopaxi","40Ar/39Ar","Sanidine",33.800000,"0.22","33.75","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Wall Mountain Tuff","1152",-1.05723333333e+002,3.83422222222e+001,"Canon City","Cotopaxi","40Ar/39Ar","Sanidine",36.800000,"0.21","36.78","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Thorn Ranch Tuff","1153",-1.05690296142e+002,3.83239559980e+001,"Canon City","Cotopaxi","40Ar/39Ar","Sanidine",33.600000,"0.12","33.6","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Gribbles Park Tuff","1154",-1.05688333333e+002,3.83230555554e+001,"Canon City","Cotopaxi","40Ar/39Ar","Sanidine",33.000000,"0.18","32.96","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Dacite","Dacite of Triad Ridge","1295",-1.06050555556e+002,3.88138888887e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Sanidine",36.100000,"0.1","36.14","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Tuff of Triad Ridge","1296",-1.06046388889e+002,3.88158333336e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Sanidine",36.200000,"0.32","36.22","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Tuff","Tuff of Triad Ridge","1297",-1.06050000000e+002,3.88175000003e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Biotite",37.300000,"0.18","37.34","McIntosh and Chapin (2004)","Plateau age."]
["Tuff","Tuff of Triad Ridge","1297",-1.06050000000e+002,3.88175000003e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Hornblende",37.300000,"0.39","37.32","McIntosh and Chapin (2004)","Plateau age."]
["Tuff","Tuff of Triad Ridge","1298",-1.06046388889e+002,3.88191666671e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Biotite",37.500000,"0.14","37.48","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Tuff of Triad Ridge","1299",-1.06042618049e+002,3.88200474703e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Biotite",37.600000,"0.15","37.62","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Rhyolite","Rhyolite of Ruby Mountain","1300",-1.06075555556e+002,3.87616666668e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Sanidine",30.100000,"0.08","30.08","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Upper tuff of Buffalo Peaks","1303",-1.06083333333e+002,3.89916666669e+001,"Gunnison","Marmot Peak","40Ar/39Ar","Hornblende",38.200000,"0.32","38.18","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Grizzly Peak Tuff","1304",-1.06616666666e+002,3.90797222222e+001,"Leadville","Independence Pass","40Ar/39Ar","Sanidine",34.300000,"0.09","34.27","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Grizzly Peak Tuff","1305",-1.06648611111e+002,3.90936111115e+001,"Leadville","New York Peak","40Ar/39Ar","Sanidine",34.400000,"0.11","34.36","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Tuff of Triad Ridge","1306",-1.05985774530e+002,3.88208180184e+001,"Pikes Peak","Castle Rock Gulch","40Ar/39Ar","Sanidine",257.000000,"65.4","257.49","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age; considered to be inaccurate or imprecise."]
["Tuff","Wall Mountain Tuff","1307",-1.06030555555e+002,3.87830555556e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Sanidine",36.700000,"0.1","36.66","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Rhyolite","Rhyolite of Bald Mountain","1308",-1.06031666667e+002,3.87813888889e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Anorthoclase",28.900000,"0.21","28.88","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Rhyolite","Rhyolite of Bald Mountain","1309",-1.06031388889e+002,3.87777777782e+001,"Gunnison","Buena Vista East","40Ar/39Ar","Sanidine",30.300000,"0.08","30.35","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Intracaldera tuff of Mount Aetna (Badger Creek Tuff)","1310",-1.06347222222e+002,3.86016666667e+001,"Gunnison","Garfield","40Ar/39Ar","Sanidine",34.300000,"0.4","34.34","McIntosh and Chapin (2004)","Badger Creek Tuff in Table 1 of McIntosh and Chapin (2004).  Laser-fusion weighted-mean age; considered to be inaccurate or imprecise."]
["Tuff","Intracaldera tuff of Mount Aetna (Badger Creek Tuff)","1311",-1.06349444444e+002,3.86050000002e+001,"Gunnison","Garfield","40Ar/39Ar","Sanidine",33.700000,"0.13","33.66","McIntosh and Chapin (2004)","Badger Creek Tuff in Appendix 1 of McIntosh and Chapin (2004).  Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Aetna stock","1312",-1.06341944445e+002,3.85949999997e+001,"Gunnison","Garfield","40Ar/39Ar","Hornblende",33.400000,"0.52","33.4","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Aetna stock","1313",-1.06326972357e+002,3.85735592686e+001,"Gunnison","Garfield","40Ar/39Ar","Biotite",34.300000,"0.29","34.28","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Aetna stock","1313",-1.06326967971e+002,3.85733208844e+001,"Gunnison","Garfield","40Ar/39Ar","Hornblende",36.400000,"0.73","36.42","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Quartz monzonite","Mount Princeton pluton","1319",-1.06282573225e+002,3.87847780712e+001,"Gunnison","Mount Yale","40Ar/39Ar","Biotite",34.500000,"0.3","34.51","McIntosh and Chapin (2004)","Near plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Princeton pluton","1319",-1.06282451406e+002,3.87847794085e+001,"Gunnison","Mount Yale","40Ar/39Ar","Hornblende",38.200000,"0.52","38.24","McIntosh and Chapin (2004)","Plateau age; considered to be inaccurate or imprecise.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (intracaldera)","1400",-1.06143333333e+002,3.83283333338e+001,"Saguache","Bonanza","40Ar/39Ar","Sanidine",32.900000,"0.13","32.92","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (lower)","1401",-1.06141666666e+002,3.83366666666e+001,"Saguache","Bonanza","40Ar/39Ar","Sanidine",33.200000,"0.1","33.17","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (intracaldera)","1402",-1.06127222223e+002,3.82080555558e+001,"Saguache","Bonanza","40Ar/39Ar","Sanidine",32.900000,"0.09","32.88","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.  Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Bonanza Tuff (intracaldera)","1404",-1.06136944444e+002,3.83116666662e+001,"Saguache","Bonanza","40Ar/39Ar","Biotite",33.300000,"0.25","33.25","McIntosh and Chapin (2004)","Plateau age; considered to be inaccurate or imprecise."]
["Quartz monzonite","Mount Princeton pluton","1405",-1.06289444445e+002,3.85991666666e+001,"Gunnison","Garfield","40Ar/39Ar","K-feldspar",31.700000,"0.27","31.67","McIntosh and Chapin (2004)","Plateau age; considered to be inaccurate or imprecise."]
["Quartz monzonite","Mount Princeton pluton","1405",-1.06289444445e+002,3.85991666666e+001,"Gunnison","Garfield","40Ar/39Ar","Biotite",34.200000,"0.13","34.21","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Aetna ring dike","1406",-1.06281020975e+002,3.86059161333e+001,"Gunnison","Garfield","40Ar/39Ar","K-feldspar",333.100000,"1.9","333.1","McIntosh and Chapin (2004)","Total gas age;  considered too old."]
["Quartz monzonite","Mount Aetna ring dike","1406",-1.06280717184e+002,3.86059194590e+001,"Gunnison","Garfield","40Ar/39Ar","Biotite",236.000000,"1.3","235.6","McIntosh and Chapin (2004)","Total gas age; considered too old."]
["Leucogranite","Mount Antero Granite","1407",-1.06271666667e+002,3.85997222219e+001,"Gunnison","Garfield","40Ar/39Ar","K-feldspar",28.600000,"0.53","28.65","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Leucogranite","Mount Antero Granite","1407",-1.06271666667e+002,3.85997222219e+001,"Gunnison","Garfield","40Ar/39Ar","Biotite (altered)",29.100000,"0.18","29.12","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Aetna ring dike","1408",-1.06354270111e+002,3.87044650374e+001,"Gunnison","Saint Elmo","40Ar/39Ar","K-feldspar",34.100000,"0.18","34.13","McIntosh and Chapin (2004)","Total gas age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Aetna ring dike","1408",-1.06354270111e+002,3.87044650374e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Hornblende",42.700000,"0.72","42.74","McIntosh and Chapin (2004)","otal gas age; considered to be inaccurate or imprecise."]
["Quartz monzonite","Mount Princeton pluton","1409",-1.06293333333e+002,3.87086111107e+001,"Gunnison","Saint Elmo","40Ar/39Ar","K-feldspar",31.700000,"0.3","31.69","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Quartz monzonite","Mount Princeton pluton","1409",-1.06293333333e+002,3.87086111107e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Biotite",34.400000,"0.16","34.12","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Princeton pluton","1409",-1.06293333333e+002,3.87086111107e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Hornblende",34.500000,"1.21","34.55","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Granite","Mount Antero Granite","1411",-1.06255000000e+002,3.86694444447e+001,"Gunnison","Saint Elmo","40Ar/39Ar","K-feldspar",26.800000,"0.23","26.77","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Granite","Mount Antero Granite","1411",-1.06255000000e+002,3.86694444447e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Biotite",29.600000,"0.11","29.64","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Granite","Mount Antero Granite","1411",-1.06255000000e+002,3.86694444447e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Muscovite",29.600000,"0.14","29.58","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Granite","Mount Antero Granite","1412",-1.06255555555e+002,3.86680555551e+001,"Gunnison","Saint Elmo","40Ar/39Ar","K-feldspar",27.800000,"0.24","27.77","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Granite","Mount Antero Granite","1412",-1.06255555555e+002,3.86680555551e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Biotite",29.600000,"0.12","29.6","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Granite","Mount Antero Granite","1412",-1.06255555555e+002,3.86680555551e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Muscovite",29.500000,"0.1","29.53","McIntosh and Chapin (2004)","Plateau age.  Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Princeton pluton","1413",-1.06272222222e+002,3.86866666666e+001,"Gunnison","Saint Elmo","40Ar/39Ar","K-feldspar",30.100000,"0.36","30.05","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Quartz monzonite","Mount Princeton pluton","1413",-1.06272222222e+002,3.86866666666e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Biotite",34.300000,"0.19","34.3","McIntosh and Chapin (2004)","Data in Appendix 6 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Quartz monzonite","Mount Princeton pluton","1413",-1.06272222222e+002,3.86866666666e+001,"Gunnison","Saint Elmo","40Ar/39Ar","Hornblende",38.200000,"2","38.23","McIntosh and Chapin (2004)","Total gas age; considered to be inaccurate or imprecise."]
["Tuff","Antero Formation","1414",-1.05857777777e+002,3.87130555556e+001,"Pikes Peak","Gribbles Park","40Ar/39Ar","Sanidine",33.700000,"0.05","33.73","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Basalt","Basalt of Herring Park","1415",-1.05853333333e+002,3.87055555553e+001,"Pikes Peak","Gribbles Park","40Ar/39Ar","Matrix",8.500000,"0.09","8.5","McIntosh and Chapin (2004)","Plateau age."]
["Tuff","Gribbles Park Tuff","1418",-1.05362222222e+002,3.81491666669e+001,"Canon City","Mount Tyndall","40Ar/39Ar","Sanidine",32.800000,"0.09","32.82","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Rhyolite","Rhyolite of Silver Cliff","1419",-1.05441666666e+002,3.81438888886e+001,"Canon City","Westcliffe","40Ar/39Ar","Sanidine",35.400000,"0.23","35.41","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Rhyolite","Rhyolite of Silver Cliff","1420",-1.05435000000e+002,3.81461111115e+001,"Canon City","Westcliffe","40Ar/39Ar","Sanidine",35.300000,"0.19","35.35","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age."]
["Rhyolite","Rhyolite of Silver Cliff","1421",-1.05436111111e+002,3.81477777773e+001,"Canon City","Westcliffe","40Ar/39Ar","Sanidine",35.400000,"0.16","35.41","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Latite","Pringle Latite","1423",-1.05351944444e+002,3.80947222221e+001,"Canon City","Rosita","40Ar/39Ar","Sanidine",32.000000,"0.56","31.99","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Tuff","Gribbles Park Tuff","1424",-1.05323611111e+002,3.80513888892e+001,"Canon City","Rosita","40Ar/39Ar","Sanidine",32.700000,"0.12","32.7","McIntosh and Chapin (2004)","Laser-fusion weighted-mean age.   Data in Appendix 5 and Table 2 (used herein) of McIntosh and Chapin (2004) differ."]
["Basaltic andesite","Andesite of Greenhorn Mountain","1860",-1.05014722222e+002,3.78813888886e+001,"Blanca Peak","San Isabel","40Ar/39Ar","Matrix",33.400000,"0.57","33.4","McIntosh and Chapin (2004)","Plateau age."]
["Dacite","Dacite flow related to State Line cinder cone","DM-98-14",-1.05231666666e+002,3.70380555552e+001,"Alamosa","Culebra Peak","40Ar/39Ar","Matrix",12.100000,"0.06","12.08","Miggins (2002)","Isochron age."]
["Rhyodacite","Picketwire rhyodacite","DM-98-2",-1.05024235171e+002,3.71500409284e+001,"Alamosa","Stonewall","40Ar/39Ar","Matrix",20.900000,"0.03","20.92","Miggins (2002)","Preferred age; isochron age is 20.93 ± 0.27."]
["Basalt","Devil's Park cinder cone","DM-98-22-7",-1.05229008828e+002,3.70297595100e+001,"Alamosa","Culebra Peak","40Ar/39Ar","Matrix",12.000000,"0.04","11.95","Miggins (2002)","Preferred age; isochron age is 11.90 ± 0.21."]
["Lamprophyre","Mafic sill next to dacitic intrusion at Picketwire","DM-98-29",-1.05017419407e+002,3.71565490332e+001,"Alamosa","Stonewall","40Ar/39Ar","Sanidine",22.300000,"0.13","22.32","Miggins (2002)","Preferred age; isochron age is 25.13 ± 1.52."]
["Lamprophyre","Dike west of Monument Lake","DM-98-31-2",-1.05050905492e+002,3.72130052534e+001,"Alamosa","Stonewall","40Ar/39Ar","Sanidine",27.300000,"0.23","27.3","Miggins (2002)","Preferred age; isochron age is 26.03 ± 0.41."]
["Lamprophyre","Dike south of Cuchara","DM-98-33-3",-1.05105254754e+002,3.73663470590e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Matrix",24.400000,"0.11","24.41","Miggins (2002)","Preferred age; isochron age is 23.59 ± 0.15."]
["Lamprophyre","Sill located north of North Lake Sill Sequence","DM-98-35",-1.05036666667e+002,3.72530555554e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Biotite",22.000000,"0.56","21.92","Miggins (2002)","Isochron age."]
["Lamprophyre","Sill located east of North Lake Sill Sequence","DM-98-36",-1.05028177705e+002,3.72397243501e+001,"Alamosa","Stonewall","40Ar/39Ar","Matrix",23.600000,"0.32","23.58","Miggins (2002)","Preferred age; isochron age is 22.81 ± 0.78."]
["Lamprophyre","Sill from North Lake sill sequence","DM-98-3-6-2",-1.05032777777e+002,3.72375000002e+001,"Alamosa","Stonewall","40Ar/39Ar","Phlogopite",22.700000,"0.05","22.71","Miggins (2002)","Plateau age."]
["Basalt","Sill located east of North Lake Sill Sequence","DM-98-37",-1.05036111111e+002,3.72538888888e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Matrix",23.500000,"0.63","23.46","Miggins (2002)","Isochron age."]
["Mafic sill","Near La Veta","DM-98-38",-1.05065833333e+002,3.75222222224e+001,"Blanca Peak","La Veta","40Ar/39Ar","Matrix",22.900000,"0.04","22.91","Miggins (2002)","Preferred age; isochron is 22.55 ± 0.16."]
["Mafic sill","Near La Veta","DM-98-39",-1.05090555556e+002,3.75300000000e+001,"Blanca Peak","La Veta","40Ar/39Ar","Sanidine",22.300000,"0.34","22.32","Miggins (2002)","Plateau age."]
["Lamprophyre","Sill east of Sulfur","DM-98-40-1",-1.05093888889e+002,3.74638888887e+001,"Alamosa","Cuchara","40Ar/39Ar","Sanidine",21.100000,"0.44","21.13","Miggins (2002)","Preferred age; isochron age is 19.16 ± 1.65."]
["Lamprophyre","Sill at Cucharas Pass","DM-98-43",-1.05061388888e+002,3.73280555556e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Matrix",21.200000,"0.04","21.18","Miggins (2002)","Preferred age; isochron age is 21.18 ± 0.11."]
["Lamprophyre","Sill north of North Lake sills","DM-98-44",-1.05044444445e+002,3.72575000004e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Matrix",23.300000,"0.06","23.26","Miggins (2002)","Preferred age; isochron age is 22.90 ± 0.16."]
["Lamprophyre","Sill north of North Lake sills","DM-98-44B",-1.05044444445e+002,3.72575000004e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Sanidine",21.000000,"0.21","20.98","Miggins (2002)","Plateau age."]
["Lamprophyre","Sill north of North Lake sills","DM-98-44B",-1.05044444445e+002,3.72575000004e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Phlogopite",20.800000,"0.07","20.83","Miggins (2002)","Plateau age."]
["Lamprophyre","Pugatoire River","DM-98-45",-1.05047078493e+002,3.70954856277e+001,"Alamosa","Torres","40Ar/39Ar","Matrix",21.900000,"0.03","21.92","Miggins (2002)","Preferred age; isochron age is 21.95 ± 0.12."]
["Lamprophyre","Sill at North Lake","DM-98-47",-1.05042222223e+002,3.72536111107e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Sanidine",21.900000,"0.97","21.92","Miggins (2002)","Preferred age; isochron age is 21.98 ± 0.16."]
["Dacite","South White Peak Dacite","DM-99-32",-1.05081944445e+002,3.73469444443e+001,"Alamosa","Cucharas Pass","FT","Apatite",16.800000,"2.3","16.8","Miggins (2002)",null]
["Lamprophyre","Sill north of North Lake sills","DM-99-59",-1.05047777778e+002,3.72661111113e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Phlogopite",21.200000,"0.34","21.18","Miggins (2002)","Preferred age; isochron age is 22.24 ± 0.23."]
["Hornblende porphyry","Dike east of Mount Maestas","DM-99-60",-1.05106040906e+002,3.75736516137e+001,"Blanca Peak","La Veta","40Ar/39Ar","Hornblende",33.000000,"5.2","32.95","Miggins (2002)","Isochron age."]
["Hornblende porphyry","Sill east of Mount Maestas","DM-99-61",-1.05117990785e+002,3.75729778803e+001,"Blanca Peak","La Veta","40Ar/39Ar","Hornblende",33.600000,"0.12","33.56","Miggins (2002)","Plateau age."]
["Lamprophyre","Tercio Valley sill","DM-99-65B",-1.05021111111e+002,3.70780555554e+001,"Alamosa","Torres","40Ar/39Ar","Sanidine",8.560000,"0.02","8.56","Miggins (2002)","Plateau age.  Sanidine may be secondary."]
["Lamprophyre","Tercio Valley sill","DM--99-66",-1.05016666667e+002,3.70658333338e+001,"Alamosa","Torres","FT","Apatite",22.300000,"2.7","22.3","Miggins (2002)",null]
["Lamprophyre","Tercio Valley sill","DM-99-67",-1.05008055555e+002,3.70569444447e+001,"Alamosa","Torres","FT","Apatite",20.900000,"3.3","20.9","Miggins (2002)",null]
["Lamprophyre","Tercio Valley sill","DM-99-68",-1.05007589394e+002,3.70558333836e+001,"Alamosa","Torres","FT","Apatite",23.700000,"2.7","23.7","Miggins (2002)",null]
["Lamprophyre","Tercio Valley sill","DM-99-68",-1.05007589394e+002,3.70558333836e+001,"Alamosa","Torres","40Ar/39Ar","Matrix",22.600000,"0.1","22.65","Miggins (2002)","Preferred age; isochron age is 22.47 ± 0.33."]
["Lamprophyre","Sill just south of San Francisco Pass","DM-99-71",-1.05106636186e+002,3.70092723012e+001,"Alamosa","Torres","40Ar/39Ar","Matrix",25.800000,"0.55","25.85","Miggins (2002)","Preferred age; isochron age is 26.29 ± 0.54."]
["Lamprophyre","South Valley","DM-99-73",-1.05030394852e+002,3.71234125085e+001,"Alamosa","Torres","40Ar/39Ar","Phlogopite",22.600000,"0.45","22.61","Miggins (2002)","Preferred age; isochron age is 21.86 ± 0.79."]
["Lamprophyre","Spanish Peaks radial dike swarm","DM-99-79",-1.05029679435e+002,3.74724608684e+001,"Alamosa","Cuchara","40Ar/39Ar","Hornblende",22.200000,"0.21","22.19","Miggins (2002)","Plateau age."]
["Rhyolite","Mount Maestas stock","P646-DM",-1.05169691156e+002,3.75863193010e+001,"Blanca Peak","La Veta Pass","40Ar/39Ar","Sanidine",25.200000,"0.06","25.17","Miggins (2002)","Total fusion age."]
["Basalt","Flatiron basalt in Santa Fe Group","B-S-2-DM",-1.05267215578e+002,3.70048086881e+001,"Alamosa","La Valley","40Ar/39Ar","Matrix",15.200000,"0.03","15.16","Miggins and others (2002)","Plateau age."]
["Basalt","Flatiron basalt in Santa Fe Group","B-S-4-DM",-1.05268055556e+002,3.70105555555e+001,"Alamosa","La Valley","40Ar/39Ar","Matrix",15.000000,"0.09","14.97","Miggins and others (2002)","Plateau age."]
["Basalt","Basalt flow related to Devil's Park cinder cone","DM-98-16",-1.05243888889e+002,3.70366666665e+001,"Alamosa","Culebra Peak","40Ar/39Ar","Matrix",11.800000,"0.06","11.8","Miggins and others (2002)","Isochron age."]
["Basalt","Devil's Park cinder cone","DM-98-22-2",-1.05229009544e+002,3.70299980201e+001,"Alamosa","Culebra Peak","40Ar/39Ar","Matrix",11.900000,"0.03","11.87","Miggins and others (2002)","Plateau age."]
["Basalt flow","Sanchez Reservoir area","DM-99-51",-1.05348333334e+002,3.70713888893e+001,"Alamosa","La Valley","40Ar/39Ar","Matrix",4.370000,"0.17","4.37","Miggins and others (2002)","Plateau age."]
["Basalt flow","Sanchez Reservoir area","DM-99-52A",-1.05340277778e+002,3.70647222223e+001,"Alamosa","La Valley","40Ar/39Ar","Matrix",10.700000,"0.1","10.74","Miggins and others (2002)","Plateau age."]
["Basalt flow","Sanchez Reservoir area","DM-99-52B",-1.05340277778e+002,3.70647222223e+001,"Alamosa","La Valley","40Ar/39Ar","Matrix",12.000000,"0.1","11.98","Miggins and others (2002)","Plateau age."]
["Basalt flow","Servilleta Basalt","DM-99-53",-1.05428055556e+002,3.72111111112e+001,"Alamosa","San Luis","40Ar/39Ar","Matrix",4.590000,"0.02","4.59","Miggins and others (2002)","Plateau age."]
["Basalt flow","Servilleta Basalt","DM-99-53A",-1.05437991593e+002,3.72623836185e+001,"Alamosa","Fort Garland SW","40Ar/39Ar","Matrix",4.750000,"0.1","4.75","Miggins and others (2002)","Isochron age."]
["Basalt flow","Servilleta Basalt","DM-99-54",-1.05376388888e+002,3.73202777781e+001,"Alamosa","Fort Garland SW","40Ar/39Ar","Matrix",4.550000,"0.15","4.55","Miggins and others (2002)","Plateau age."]
["Basalt","Basalt flow in Santa Fe Group","P80-23B-DM",-1.05271683795e+002,3.70248393470e+001,"Alamosa","La Valley","40Ar/39Ar","Matrix",15.100000,"0.03","15.11","Miggins and others (2002)","Plateau.  Sample  number is apparently misreported as P83-23B-DM in Table 1 of Miggins and others (2002)"]
["Vein material","Sweet Home mine","92SH01",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","K/Ar","Sericite",30.600000,"0.8","30.6","Misantoni and others (1998)","Location approximate; estimated from description."]
["Vein material","Sweet Home mine","92SH02",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","K/Ar","Sericite",27.600000,"0.7","27.6","Misantoni and others (1998)","Location approximate; estimated from description."]
["Vein material","Sweet Home mine","92SH03",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","K/Ar","Sericite",30.600000,"0.8","30.6","Misantoni and others (1998)",null]
["Granodiorite","Pando Porphyry","4233",-1.06227777778e+002,3.92249999997e+001,"Leadville","Mount Sherman","Rb-Sr","Whole-rock",98.000000,"11","100 ± 11","Moorbath and others (1967)",null]
["Granite","Twin Lakes stock","4534",-1.06415762180e+002,3.90703328874e+001,"Leadville","Mount Elbert(?)","Rb-Sr","Biotite",55.000000,"10","56 ± 10","Moorbath and others (1967)","Locations and recalculated ages by Fridrich and others (1991) using initial ration of 0.706."]
["Climax - orebody","Climax","4550",-1.06163499588e+002,3.93728115935e+001,"Leadville","Climax","Rb-Sr","Sericite",71.000000,"8","73 ± 8","Moorbath and others (1967)","Age too old based on more recent geochronology."]
["Feldspathic gneiss","Grottos pluton","4579",-1.06748789870e+002,3.91297203767e+001,"Leadville","Aspen","Rb-Sr","Whole-rock",1400.000000,"Not report","1520","Moorbath and others (1967)","Locations  and recalculated ages by Fridrich and others (1991) using initial ration of 0.706."]
["Feldspathic gneiss","Denny Creek pluton","4582",-1.06567304034e+002,3.91008931936e+001,"Leadville","Independence Pass","Rb-Sr","Whole-rock",1625.000000,"Not report","1670","Moorbath and others (1967).","Locations and recalculated ages by Fridrich and others (1991). Model ages."]
["Feldspathic gneiss","Metasedimentary gneiss","4580a",-1.06675360044e+002,3.91255561146e+001,"Leadville","New York Peak","Rb-Sr","Whole-rock",1371.000000,"35","1395 ± 35","Moorbath and others (1967)","Locations and recalculated ages by Fridrich and others (1991). Model ages."]
["Feldspathic gneiss","Metasedimentary gneiss","4580b",-1.06675360044e+002,3.91255561146e+001,"Leadville","New York Peak","Rb-Sr","Whole-rock",1650.000000,"Not report","1700","Moorbath and others (1967).","Locations and recalculated ages by Fridrich and others (1991). Model ages."]
["Feldspathic gneiss","Metasedimentary gneiss","4581a",-1.06649964076e+002,3.91264864479e+001,"Leadville","Thimble Rock","Rb-Sr","Whole-rock",1700.000000,"Not report","1750","Moorbath and others (1967)","Locations and recalculated ages by Fridrich and others (1991). Model ages."]
["Feldspathic gneiss","Metasedimentary gneiss","4581b",-1.06649964076e+002,3.91264864479e+001,"Leadville","Thimble Rock","Rb-Sr","Whole-rock",1890.000000,"Not report","1970","Moorbath and others (1967)","Locations and recalculated ages by Fridrich and others (1991). Model ages."]
["Gneiss","Drill core","9",-1.05773900000e+002,3.76651999999e+001,"Blanca Peak","Hooper West","K/Ar","Biotite",1276.000000,"65","1260","Muehlberger and others (1966)","Drill core sample.  Location and recalculated age in Shaw and others (2005)."]
["Pyroxene-hornblende trachydacite","Signal Butte","SB-8",-1.05224200000e+002,3.90721999996e+001,"Bailey","Signal Butte","FT","Zircon",42.200000,"2.1",null,"Naeser (unpub); sample collected by R.B. Colton","Plug rises 150 m above well developed erosion surface."]
["Quartz monzonite","Tincup porphyry sill","DF-1150",-1.06509444444e+002,3.86775000004e+001,"Gunnison","Fairview Peak","FT","Zircon",33.600000,"2.8","33.6 ± 2.8","Naeser and Cunningham (1976)",null]
["Rhyolite porphyry","Tomichi Creek stock","DF-1157",-1.06405442459e+002,3.84701268867e+001,"Saguache","Sargents","FT","Zircon",34.400000,"3.3","34.4 ± 3.3","Naeser and Cunningham (1976)",null]
["Rhyodacite","Tomichi Creek stock","DF-1159",-1.06405254799e+002,3.84711870552e+001,"Saguache","Sargents","FT","Zircon",29.600000,"2.7","28.7","Naeser and Cunningham (1976)","Age recalculated by Cunningham and others (1994)."]
["Kimberlite*","Schaffer no. 3 diatreme","Schaffer no. 3 pipe",-1.05509700000e+002,4.09947000002e+001,"Fort Collins","Diamond Peak","FT","Zircon",377.000000,"9",null,"Haggerty and others (1983)","Six zircon grains from xenoliths."]
["Granite","Henderson mine, East Knob porphyry","1, Table 4",-1.05833300000e+002,3.97666999996e+001,"Denver West","Berthoud Pass","FT","Zircon",28.500000,"2.2",null,"Naeser and others (1973); Geissman and others (1992)",null]
["Granite","Henderson mine, East Knob porphyry","2, Table 4",-1.05833300000e+002,3.97666999996e+001,"Denver West","Berthoud Pass","FT","Zircon",27.200000,"2.6",null,"Naeser and others (1973); Geissman and others (1992)","This and the following 42 samples are from Henderson mine about 1 km below the valley bottom and in the Red Mountain area above it.  Except for 6 samples, locations are generalized."]
["Rhyolite","Red Mountain-Henderson","70-169",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","FT","Zircon",27.600000,"2.9",null,"Naeser and others (1973); Marvin and others (1974)",null]
["Rhyolite","Red Mountain-Henderson","72-123",-1.05827800000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","FT","Zircon",27.600000,"2.9",null,"Naeser and others (1973); Marvin and others (1974)",null]
["Rhyolite","Red Mountain-Henderson","72-125",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","FT","Zircon",27.600000,"2.1",null,"Naeser and others (1973); Marvin and others (1974)",null]
["Rhyolite","Red Mountain-Henderson","72-126",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","FT","Zircon",26.900000,"2.7",null,"Naeser and others (1973); Marvin and others (1974)",null]
["Rhyolite","Red Mountain-Henderson","72-143",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","FT","Zircon",25.100000,"2.7",null,"Naeser and others (1973); Marvin and others (1974)",null]
["Rhyolite","Red Mountain-Henderson","72-144",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","FT","Zircon",22.800000,"2.3",null,"Naeser and others (1973); Marvin and others (1974)",null]
["Troublesome Formation","Volcanic ash bed","9",-1.06379166667e+002,4.00883333332e+001,"Steamboat Springs","Kremmling","FT","Zircon",11.500000,"0.9","11.5","Naeser and others (1990)",null]
["Troublesome Formation","Volcanic ash bed","9",-1.06379166667e+002,4.00883333332e+001,"Steamboat Springs","Kremmling","FT","Glass",8.600000,"0.7","8.6","Naeser and others (1990)",null]
["Troublesome Formation","Volcanic ash bed","10",-1.06296107963e+002,4.00314967107e+001,"Steamboat Springs","Junction Butte","FT","Zircon",13.500000,"1.1","13.5","Naeser and others (1990)",null]
["Troublesome Formation","Volcanic ash bed","10",-1.06296235580e+002,4.00316859847e+001,"Steamboat Springs","Junction Butte","FT","Zircon",13.300000,"0.6","13.3","Naeser and others (1990)",null]
["Troublesome Formation","Volcanic ash bed","10",-1.06296231971e+002,4.00314953239e+001,"Steamboat Springs","Junction Butte","FT","Glass",10.500000,"0.8","10.5","Naeser and others (1990)",null]
["Granite","Cross Creek pluton","87N1",-1.06382222222e+002,3.95311111115e+001,"Vail","Minturn","FT","Apatite",29.700000,"4.9","29.7","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","87N2",-1.06382500000e+002,3.95305555553e+001,"Vail","Minturn","FT","Apatite",25.500000,"5.7","25.5","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","87N3",-1.06380277778e+002,3.95305555553e+001,"Vail","Minturn","FT","Apatite",43.500000,"14","43.5","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","87N4",-1.06380555555e+002,3.95300000000e+001,"Vail","Minturn","FT","Apatite",39.600000,"11","39.6","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","87N4",-1.06380555555e+002,3.95300000000e+001,"Vail","Minturn","FT","Zircon",500.000000,"96","500","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","87N6",-1.06391111111e+002,3.95325000001e+001,"Vail","Minturn","FT","Apatite",32.300000,"4.9","32.3","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Ore","Ore from Gilman","Gil 1",-1.06383888889e+002,3.95338888888e+001,"Vail","Minturn","FT","Apatite",34.500000,"4.4","34.5","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 11",-1.06390833333e+002,3.95172222222e+001,"Vail","Minturn","FT","Apatite",41.500000,"11","41.5","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 11",-1.06390833333e+002,3.95172222222e+001,"Vail","Minturn","FT","Zircon",771.000000,"170","771","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 12",-1.06391666666e+002,3.95227777777e+001,"Vail","Minturn","FT","Apatite",39.800000,"18","39.8","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 12",-1.06391666666e+002,3.95227777777e+001,"Vail","Minturn","FT","Zircon",904.000000,"25","904","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 13",-1.06388055556e+002,3.95277777780e+001,"Vail","Minturn","FT","Apatite",58.000000,"21","58","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 14",-1.06400000000e+002,3.95311111115e+001,"Vail","Minturn","FT","Apatite",40.100000,"24","40.1","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 15",-1.06400523526e+002,3.95373780029e+001,"Vail","Minturn","FT","Apatite",35.300000,"15","35.3","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 16",-1.06400000000e+002,3.95486111115e+001,"Vail","Minturn","FT","Zircon",54.900000,"6.2","54.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 17",-1.06389444444e+002,3.95286111114e+001,"Vail","Minturn","FT","Zircon",52.500000,"5","52.5","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 18",-1.06389166666e+002,3.95227777777e+001,"Vail","Minturn","FT","Zircon",46.600000,"5.8","46.6","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 19",-1.06385554716e+002,3.95140037105e+001,"Vail","Minturn","FT","Apatite",44.200000,"10","44.2","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 19",-1.06385554716e+002,3.95140037105e+001,"Vail","Minturn","FT","Zircon",877.000000,"20","877","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 2",-1.06396666667e+002,3.95361111108e+001,"Vail","Minturn","FT","Apatite",28.700000,"22","8.7","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 2",-1.06396666667e+002,3.95361111108e+001,"Vail","Minturn","FT","Zircon",45.900000,"4.3","45.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 20",-1.06383888889e+002,3.95097222218e+001,"Vail","Minturn","FT","Apatite",50.800000,"24","50.8","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 21",-1.06380000000e+002,3.95319444449e+001,"Vail","Minturn","FT","Apatite",38.900000,"15","38.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 21",-1.06380000000e+002,3.95319444449e+001,"Vail","Minturn","FT","Zircon",542.000000,"95","542","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 22",-1.06384722222e+002,3.95311111115e+001,"Vail","Minturn","FT","Zircon",550.000000,"71","550","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 23",-1.06386666667e+002,3.95311111115e+001,"Vail","Minturn","FT","Apatite",32.900000,"4.5","32.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 23",-1.06386666667e+002,3.95311111115e+001,"Vail","Minturn","FT","Zircon",562.000000,"84","562","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 24",-1.06392222223e+002,3.95316666668e+001,"Vail","Minturn","FT","Zircon",213.000000,"32","213","Naeser and others (1990)","Zircons from this sample had two age populations.  Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 24",-1.06392222223e+002,3.95316666668e+001,"Vail","Minturn","FT","Zircon",994.000000,"150","994","Naeser and others (1990)","Zircons from this sample had two age populations.  Location from Wallace (1993, 1995)."]
["Arkose","Minturn Formation","Gil 25",-1.06396203241e+002,3.95556719010e+001,"Vail","Minturn","FT","Zircon",231.000000,"31","231","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 3",-1.06397777778e+002,3.95458333333e+001,"Vail","Minturn","FT","Apatite",63.000000,"40","63","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 3",-1.06397777778e+002,3.95458333333e+001,"Vail","Minturn","FT","Zircon",45.200000,"5.1","45.2","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 4",-1.06382777777e+002,3.95180555556e+001,"Vail","Minturn","FT","Apatite",69.000000,"34","69","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 4",-1.06382777777e+002,3.95180555556e+001,"Vail","Minturn","FT","Zircon",53.000000,"7.9","53","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 40",-1.06390000000e+002,3.95388888891e+001,"Vail","Minturn","FT","Zircon",53.400000,"6","53.4","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 41",-1.06380000000e+002,3.95466666666e+001,"Vail","Minturn","FT","Zircon",48.000000,"5.6","48","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 42",-1.06380000000e+002,3.95466666666e+001,"Vail","Minturn","FT","Zircon",58.100000,"6.8","58.1","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 43",-1.06372222223e+002,3.95411111111e+001,"Vail","Red Cliff","FT","Zircon",44.500000,"5.2","44.5","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 44",-1.06372222223e+002,3.95411111111e+001,"Vail","Red Cliff","FT","Zircon",49.700000,"5.6","49.7","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 45",-1.06363888889e+002,3.95347222222e+001,"Vail","Red Cliff","FT","Zircon",48.200000,"7","48.2","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 46",-1.06365277777e+002,3.95358333336e+001,"Vail","Red Cliff","FT","Zircon",45.900000,"5.8","45.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 47",-1.06375000000e+002,3.95291666666e+001,"Vail","Red Cliff","FT","Zircon",55.200000,"6.6","55.2","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 48",-1.06375833333e+002,3.95422222226e+001,"Vail","Minturn","FT","Zircon",42.900000,"4.8","42.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 49",-1.06375833333e+002,3.95422222226e+001,"Vail","Minturn","FT","Zircon",56.400000,"8.4","56.4","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 5",-1.06379722222e+002,3.95338888888e+001,"Vail","Minturn","FT","Apatite",38.200000,"10","38.2","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 5",-1.06379722222e+002,3.95338888888e+001,"Vail","Minturn","FT","Zircon",486.000000,"64","486","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 50",-1.06378888889e+002,3.95327777773e+001,"Vail","Minturn","FT","Zircon",40.400000,"4.6","40.4","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 6",-1.06381666667e+002,3.95316666668e+001,"Vail","Minturn","FT","Apatite",48.300000,"11","48.3","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 6",-1.06381666667e+002,3.95316666668e+001,"Vail","Minturn","FT","Zircon",766.000000,"180","766","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 7",-1.06381111112e+002,3.95327777773e+001,"Vail","Minturn","FT","Apatite",29.900000,"18","29.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","Gil 7",-1.06381111112e+002,3.95327777773e+001,"Vail","Minturn","FT","Zircon",671.000000,"170","671","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 8",-1.06360555555e+002,3.95175000003e+001,"Vail","Red Cliff","FT","Apatite",41.100000,"32","41.1","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 8",-1.06360555555e+002,3.95175000003e+001,"Vail","Red Cliff","FT","Zircon",60.100000,"7.8","60.1","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Quartz latite","Pando Porphyry","Gil 9",-1.06378611111e+002,3.95111111114e+001,"Vail","Minturn","FT","Zircon",58.900000,"7","58.9","Naeser and others (1990)","Location from Wallace (1993, 1995)."]
["Diorite","Plug at Red Cliff","Gil 10",-1.06380109999e+002,3.95076157551e+001,"Vail","Minturn","FT","Apatite",46.700000,"19","46.7","Naeser and others (1990)","Age recalculated by Wallace (1993, 1995)."]
["Diorite","Plug at Red Cliff","Gil 10",-1.06380109999e+002,3.95076157551e+001,"Vail","Minturn","FT","Zircon",758.000000,"14","758","Naeser and others (1990)","Age recalculated by Wallace (1993, 1995)."]
["Arkosic sandstone","Minturn Formation","87GR11",-1.06210833334e+002,3.95497222221e+001,"Vail","Vail East","FT","Apatite",26.500000,"4.3","26.5","Naeser and others (2002)",null]
["Arkosic sandstone","Minturn Formation","87GR-4",-1.06269722223e+002,3.96288888892e+001,"Vail","Vail East","FT","Apatite",17.700000,"6.2","17.7","Naeser and others (2002)","Central age (Galbraith and Laslett, 1993)."]
["Granite","Cross Creek pluton","GR-7",-1.06282500000e+002,3.96511111113e+001,"Vail","Vail East","FT","Apatite",24.000000,"6","24","Naeser and others (2002)","Track length measured.  Central age (Galbraith and Laslett, 1993)."]
["Pyroxene-plagioclase hornblende granofels","Pluton of Officers Gulch","GR-F-1",-1.06113055555e+002,3.95749999996e+001,"Vail","Frisco","FT","Apatite",7.500000,"1.6","7.5","Naeser and others (2002)","Track lengths measured."]
["Gneiss","Gore Range","GR-MP-1",-1.06327460327e+002,3.98281316172e+001,"Vail","Mount Powell","FT","Apatite",4.800000,"2.6","4.8","Naeser and others (2002)",null]
["Biotite quartz diorite","Gore Range","GR-MP-2",-1.06345833333e+002,3.98125000001e+001,"Vail","Mount Powell","FT","Apatite",20.400000,"6.6","20.4","Naeser and others (2002)","Track length measured."]
["Granite","Cross Creek pluton","GR-PP-1",-1.06421388889e+002,3.98288888886e+001,"Vail","Piney Peak","FT","Apatite",31.200000,"8.7","31.2","Naeser and others (2002)","Track length measured.  Central age (Galbraith and Laslett, 1993)."]
["Migmatitic biotite granite","Gore Range","GR-PP-2",-1.06403888889e+002,3.98024999996e+001,"Vail","Piney Peak","FT","Apatite",37.000000,"4.3","37","Naeser and others (2002)",null]
["Pyroxene-hornblende-quartz-plagioclase granofels","Copper Mountain area","GR-VP-1",-1.06139166667e+002,3.95311111115e+001,"Vail","Vail Pass","FT","Apatite",6.400000,"2","6.4","Naeser and others (2002)","Track lengths measured."]
["Gneiss","Gore Range","GR-VP-10",-1.06142500000e+002,3.96161111113e+001,"Vail","Vail Pass","FT","Apatite",19.400000,"5.1","19.4","Naeser and others (2002)","Track lengths measured."]
["Gneiss","Gore Range","GR-VP-11",-1.06141944444e+002,3.96180555553e+001,"Vail","Vail Pass","FT","Apatite",19.200000,"6.7","19.2","Naeser and others (2002)","Track lengths measured."]
["Gneiss","Gore Range","GR-VP-12",-1.06135000000e+002,3.96213888888e+001,"Vail","Vail Pass","FT","Apatite",11.000000,"2.8","11","Naeser and others (2002)","Track lengths measured."]
["Granite","Gore Range","GR-VP-13",-1.06195555556e+002,3.95566666663e+001,"Vail","Vail Pass","FT","Apatite",30.800000,"5","30.8","Naeser and others (2002)","Track lengths measured."]
["Tonalite","Gore Range","GR-VP-14",-1.06196944444e+002,3.95516666669e+001,"Vail","Vail Pass","FT","Apatite",32.600000,"4.6","32.6","Naeser and others (2002)","Track lengths measured."]
["Tonalite","Gore Range","GR-VP-8A",-1.06198888889e+002,3.95399999996e+001,"Vail","Vail Pass","FT","Apatite",25.500000,"4.9","25.5","Naeser and others (2002)",null]
["Granofels","Copper Mountain","GR-VP-9",-1.06163055556e+002,3.95022222223e+001,"Vail","Vail Pass","FT","Apatite",25.400000,"5.5","25.4","Naeser and others (2002)",null]
["Mafic inclusion","Gore Range","GR-WL-1",-1.06218055555e+002,3.96916666669e+001,"Vail","Willow Lakes","FT","Apatite",15.900000,"2.2","15.9","Naeser and others (2002)","Track lengths measured."]
["Monzogranite","Cross Creek pluton","GR-WL-10",-1.06219444445e+002,3.96252777776e+001,"Vail","Willow Lakes","FT","Apatite",21.000000,"2.5","21","Naeser and others (2002)","Track length measured."]
["Tonalite","Cross Creek pluton","GR-WL-11",-1.06244166667e+002,3.96288888892e+001,"Vail","Willow Lakes","FT","Apatite",23.200000,"4.1","23.2","Naeser and others (2002)","Track length measured.  Central age (Galbraith and Laslett, 1993)."]
["Tonalite","Cross Creek pluton","GR-WL-12",-1.06242500000e+002,3.96513888885e+001,"Vail","Willow Lakes","FT","Apatite",28.900000,"3.1","28.9","Naeser and others (2002)","Track lengths measured."]
["Tonalite","Cross Creek pluton","GR-WL-13",-1.06245277778e+002,3.96430555557e+001,"Vail","Willow Lakes","FT","Apatite",32.300000,"5.1","32.3","Naeser and others (2002)","Track length measured."]
["Migmatite","Gore Range","GR-WL-2",-1.06215000000e+002,3.96952777776e+001,"Vail","Willow Lakes","FT","Apatite",13.500000,"2.2","13.5","Naeser and others (2002)","Track lengths measured."]
["Granite","Cross Creek pluton","GR-WL-3",-1.06211388889e+002,3.96941666670e+001,"Vail","Willow Lakes","FT","Apatite",16.800000,"3.4","16.8","Naeser and others (2002)","Track lengths measured."]
["Biotitic migmatite","Gore Range","GR-WL-4",-1.06207500000e+002,3.96936111108e+001,"Vail","Willow Lakes","FT","Apatite",11.900000,"1.5","11.9","Naeser and others (2002)","Track lengths measured."]
["Granitic gneiss","Gore Range","GR-WL-5",-1.06134444445e+002,3.96313888893e+001,"Vail","Willow Lakes","FT","Apatite",8.800000,"2.6","8.8","Naeser and others (2002)","Track lengths measured."]
["Migmatite","Gore Range","GR-WL-6",-1.06149166667e+002,3.96319444446e+001,"Vail","Willow Lakes","FT","Apatite",10.900000,"2.4","10.9","Naeser and others (2002)","Track lengths measured."]
["Granite","Cross Creek pluton","GR-WL-7",-1.06143055556e+002,3.96302777778e+001,"Vail","Willow Lakes","FT","Apatite",6.700000,"1.5","6.7","Naeser and others (2002)","Track lengths measured."]
["Migmatitic granite","Gore Range","GR-WL-8",-1.06201944445e+002,3.96916666669e+001,"Vail","Willow Lakes","FT","Apatite",11.600000,"3","11.6","Naeser and others (2002)","Track lengths measured.  Central age (Galbraith and Laslett, 1993)."]
["Migmatitic biotite granite","Gore Range","GR-WL-9",-1.06197777778e+002,3.96908333335e+001,"Vail","Willow Lakes","FT","Apatite",9.900000,"3.2","9.9","Naeser and others (2002)","Track lengths measured.  Central age (Galbraith and Laslett, 1993)."]
["Silicic tuff","Blue River Valley","K98-9-21A",-1.06204444445e+002,3.97902777780e+001,"Vail","Squaw Creek","40Ar/39Ar","Sanidine",26.900000,"0.07","26.88","Naeser and others (2002)","Laser fusion technique."]
["Silicic welded tuff","Blue River Valley","K98-9-21B",-1.06204444445e+002,3.97899999999e+001,"Vail","Squaw Creek","40Ar/39Ar","Sanidine",26.900000,"0.07","26.9","Naeser and others (2002)","Laser fusion technique."]
["Trachyandesite","Volcanic rocks of the Green Mountain area","K98-9-21C",-1.06280833334e+002,3.98266666666e+001,"Vail","Mount Powell","40Ar/39Ar","Sanidine",23.600000,"0.06","23.61","Naeser and others (2002)","Laser fusion technique."]
["Trachyandesite","Volcanic rocks of the Green Mountain area","K98-9-21D",-1.06281111111e+002,3.98261111113e+001,"Vail","Mount Powell","40Ar/39Ar","Sanidine",23.600000,"0.06","23.62","Naeser and others (2002)","Laser fusion technique."]
["Trachyandesite","Volcanic rocks of the Green Mountain area","K98-9-21E",-1.06282777778e+002,3.98261111113e+001,"Vail","Mount Powell","40Ar/39Ar","Sanidine",23.700000,"0.06","23.66","Naeser and others (2002)","Laser fusion technique."]
["Trachyte","Green Mountain sills","K98-9-21F",-1.06327500000e+002,3.98786111113e+001,"Vail","King Creek","40Ar/39Ar","Sanidine",31.500000,"0.08","31.51","Naeser and others (2002)","Laser fusion technique.  Apparent typographical error, Naeser and others (2002) cite sample number K98-9-8F in text (p.45) butr data and location tables indicate the sample is K98-9-21F."]
["Granite","Cross Creek pluton","MP-97-284",-1.06340277778e+002,3.97600000001e+001,"Vail","Mount Powell","FT","Apatite",24.400000,"2.5","24.4","Naeser and others (2002)","Track lengths measured."]
["Biotite-muscovite gneiss","Cross Creek pluton","MP-97-285",-1.06340555555e+002,3.97566666666e+001,"Vail","Mount Powell","FT","Apatite",236.000000,"104","236","Naeser and others (2002)","Track lengths measured.  Central age (Galbraith and Laslett, 1993)."]
["Biotite granite gneiss","Cross Creek pluton","MP-97-286",-1.06340833333e+002,3.97555555552e+001,"Vail","Mount Powell","FT","Apatite",24.700000,"4.5","24.7","Naeser and others (2002)","Track lengths measured."]
["Monzogranite","Cross Creek pluton","MP-97-287",-1.06335833333e+002,3.97541666665e+001,"Vail","Mount Powell","FT","Apatite",22.400000,"2.2","22.4","Naeser and others (2002)","Track lengths measured."]
["Metagabbro","Gore Range","MP-97-288",-1.06318333333e+002,3.97572222219e+001,"Vail","Mount Powell","FT","Apatite",21.400000,"2.6","21.4","Naeser and others (2002)","Track lengths measured."]
["Granite","Cross Creek pluton","MP-97-289",-1.06289166667e+002,3.97688888892e+001,"Vail","Mount Powell","FT","Apatite",14.100000,"1.9","14.1","Naeser and others (2002)","Track lengths measured."]
["Biotite-muscovite granite","Cross Creek pluton","MP-97-290",-1.06276944444e+002,3.97841666662e+001,"Vail","Mount Powell","FT","Apatite",12.800000,"3.5","12.8","Naeser and others (2002)","Track lengths measured."]
["Granite","Windy Point pluton of the Pikes Peak batholith","PPG-14",-1.05044166667e+002,3.88408333331e+001,"Pikes Peak","Pikes Peak","FT","Zircon",1045.000000,"130","1045","Naeser and others (2002)",null]
["Granite","Windy Point pluton of the Pikes Peak batholith","PPG-14",-1.05044166667e+002,3.88408333331e+001,"Pikes Peak","Pikes Peak","FT","Apatite",458.000000,"58","458","Naeser and others (2002)","Track lengths measured."]
["Granite","Cross Creek pluton","SJ86-100",-1.06339722223e+002,3.96713888887e+001,"Vail","Vail East","FT","Apatite",22.900000,"3.8","22.9","Naeser and others (2002)","Track length measured."]
["Arkosic sandstone","Minturn Formation","SJ86-101",-1.06340088104e+002,3.96702611532e+001,"Vail","Vail East","FT","Apatite",30.200000,"3.7","30.2","Naeser and others (2002)",null]
["Granite","Cross Creek pluton","SJ86-105",-1.06341580934e+002,3.96821154622e+001,"Vail","Vail East","FT","Apatite",22.700000,"11","22.7","Naeser and others (2002)","Central age (Galbraith and Laslett, 1993)."]
["Arkosic sandstone","Minturn Formation","SJ86-109",-1.06223888889e+002,3.95338888888e+001,"Vail","Vail Pass","FT","Apatite",24.200000,"4.3","24.2","Naeser and others (2002)",null]
["Granodiorite","Ute Peak area","UP-1",-1.06116944445e+002,3.98322222222e+001,"Vail","Ute Peak","FT","Apatite",27.500000,"5.7","27.5","Naeser and others (2002)","Track lengths measured."]
["Granodiorite","Ute Peak area","UP-1",-1.06116944445e+002,3.98322222222e+001,"Vail","Ute Peak","FT","Zircon",1310.000000,"410","1310","Naeser and others (2002)",null]
["Granodiorite gneiss","Ute Peak area","UP-2",-1.06113818064e+002,3.98302969131e+001,"Vail","Ute Peak","FT","Apatite",21.000000,"4.5","21","Naeser and others (2002)","Track lengths measured."]
["Schist","Ute Peak area","UP-3",-1.06055772762e+002,3.98227707478e+001,"Vail","Ute Peak","FT","Apatite",35.900000,"4.7","35.9","Naeser and others (2002)","Track lengths measured."]
["Andesitic cobble","South Table Mountain andesite","70-0-10",-1.05162500000e+002,3.97528000001e+001,"Denver West","Golden","K/Ar","Biotite",65.800000,"1.4",null,"Obradovich and Cobban (1975); Obradovich (2002)","50 m below trachybasalts on South Table Mountain and 21 m above K-T boundary."]
["Granite","Granite of Treasure Mountain","348",-1.07118888889e+002,3.90544444446e+001,"Carbondale","Snowmass Mountain","K/Ar","Biotite",12.800000,"0.6","12.5","Obradovich and others (1969)","Age recalculated by Wallace (1993, 1995)."]
["Granodiorite","Snowmass pluton","386",-1.07040555556e+002,3.91175000004e+001,"Carbondale","Snowmass Mountain","K/Ar","Biotite",35.000000,"1.4","34.1","Obradovich and others (1969)",null]
["Granodiorite","Snowmass Creek sill","389",-1.07018888889e+002,3.91852777775e+001,"Carbondale","Capitol Peak","K/Ar","Biotite",32.000000,"1.1","31.2","Obradovich and others (1969)","Age recalculated by Wallace (1993, 1995)."]
["Granodiorite","Paradise stock","390",-1.07057777778e+002,3.89916666669e+001,"Paonia","Oh-Be-Joyful","K/Ar","Biotite",29.800000,"1.1","29","Obradovich and others (1969)",null]
["Soda granite porphyry","Crystal pluton","391",-1.07121388889e+002,3.90516666664e+001,"Montrose","Snowmass Mountain","K/Ar","Biotite",12.600000,"0.6","12.3","Obradovich and others (1969)",null]
["Granodiorite porphyry","Crested Butte laccolith","472",-1.06943333334e+002,3.88888888890e+001,"Gunnison","Gothic","K/Ar","Biotite",29.900000,"1","29.1± 1.0","Obradovich and others (1969)",null]
["Aplite","Pando Porphyry","1045",-1.06800555555e+002,3.91055555560e+001,"Leadville","Hayden Peak","K/Ar","Biotite",71.800000,"2","70.0 ± 2.3","Obradovich and others (1969)",null]
["Aplite","Pando Porphyry","1045",-1.06800555555e+002,3.91055555560e+001,"Leadville","Hayden Peak","K/Ar","Biotite",69.100000,"2","67.4 ± 2.2","Obradovich and others (1969)",null]
["Quartz-muscovite porphyry","Little Annie sill (?)","HNMP",-1.06825000000e+002,3.91186111110e+001,"Leadville","Aspen","K/Ar","Muscovite",74.000000,"2.2","72.2","Obradovich and others (1969)",null]
["Granodiorite porphyry","Lincoln Creek stock","NY-5",-1.06641388889e+002,3.90888888885e+001,"Leadville","New York Peak","K/Ar","Biotite",34.800000,"1.1","33.9 ± 1.1","Obradovich and others (1969)","Age recalculated by Wallace (1993, 1995)."]
["Quartz monzonite porphyry","Twin Lakes stock","TL",-1.06472851557e+002,3.90687698586e+001,"Leadville","Mount Elbert","K/Ar","Biotite",42.700000,"1.2","41.7","Obradovich and others (1969)","Age recalculated by Wallace (1993, 1995)."]
["Quartz monzonite porphyry","Twin Lakes stock","TL",-1.06472729261e+002,3.90687714036e+001,"Leadville","Mount Elbert","Rb-Sr","Biotite",48.700000,"4.5","49.7","Obradovich and others (1969)",null]
["Granodiorite","Whiterock pluton","WR-2",-1.06837777777e+002,3.90097222222e+001,"Leadville","Hayden Peak","K/Ar","Biotite",34.800000,"1","33.9","Obradovich and others (1969)","Age recalculated by Wallace (1993, 1995)."]
["Biotite syenite","Alkalic stocks in northwest part of Powderhorn district","2G3200",-1.07127500000e+002,3.83591666669e+001,"Montrose","Gateview","K/Ar","Biotite",1397.000000,"40","1390","Olson and others (1977)",null]
["Quartz syenite","Gem Park Complex","52-B-53",-1.05350000000e+002,3.82500000000e+001,"Canon City","Curley Peak","K/Ar","Biotite",513.000000,"25","504","Olson and others (1977)",null]
["Quartz syenite","Gem Park Complex","63-B-20",-1.05366666667e+002,3.82583333338e+001,"Canon City","Curley Peak","K/Ar","Biotite",528.000000,"13","519","Olson and others (1977)",null]
["Quartz syenite","Gem Park Complex","63-B-20",-1.05366666667e+002,3.82583333338e+001,"Canon City","Curley Peak","K/Ar","Hornblende",543.000000,"16","534","Olson and others (1977)",null]
["Syenite","Gem Park Complex","63-B-23",-1.05367500000e+002,3.82405555557e+001,"Canon City","Mount Tyndall","K/Ar","Whole-rock",494.000000,"24","485","Olson and others (1977)",null]
["Syenite","Gem Park Complex","63-B-24",-1.05336666666e+002,3.82794444445e+001,"Canon City","Curley Peak","K/Ar","Whole-rock",569.000000,"28","560","Olson and others (1977)",null]
["Syenite","Gem Park Complex","63-B-24b",-1.05333333334e+002,3.82666666666e+001,"Canon City","Curley Peak","K/Ar","Whole-rock",435.000000,"22","427","Olson and others (1977)",null]
["Mafic syenite","Alkalic stocks in northwest part of Powderhorn district","C9803",-1.07140555556e+002,3.83958333336e+001,"Montrose","Carpenter Ridge","K/Ar","Biotite",1388.000000,"40","1380","Olson and others (1977)",null]
["Biotite-calcite syenite","Alkalic stocks in northwest part of Powderhorn district","G3730N",-1.07138888889e+002,3.83452777776e+001,"Montrose","Gateview","K/Ar","Biotite",1338.000000,"36","1330","Olson and others (1977)",null]
["Melasyenite","Alkalic complex at Powderhorn district","IH-11",-1.07033333334e+002,3.82305555552e+001,"Montrose","Rudolph Hill","K/Ar","Phlogopite",577.000000,"9","568","Olson and others (1977)",null]
["Melasyenite","Powderhorn district","IH-11",-1.07033333334e+002,3.82305555552e+001,"Montrose","Rudolph Hill","Rb-Sr","Phlogopite",567.000000,"10","579 ± 10","Olson and others (1977)","Isochron based on 5 mineral-whole-rock samples.  (Sample 3 of 5)."]
["Pegmatite","Alkalic complex at Iron Hill","IH-1-2",-1.07022777778e+002,3.82544444441e+001,"Montrose","Powderhorn","K/Ar","Biotite",577.000000,"9","568","Olson and others (1977)",null]
["Pegmatite","Powderhorn district","IH-1-2",-1.07022777778e+002,3.82544444441e+001,"Montrose","Powderhorn","Rb-Sr","Biotite",567.000000,"10","579 ± 10","Olson and others (1977)","Isochron based on 5 mineral-whole-rock samples.  (Sample 2 of 5)."]
["Carbonatite","Alkalic complex at Iron Hill","IH-18",-1.07066666667e+002,3.82422222224e+001,"Montrose","Rudolph Hill","K/Ar","Biotite",582.000000,"14","573","Olson and others (1977)",null]
["Diabase","Alkalic complex at Iron Hill","IH-21",-1.07056111111e+002,3.82686111115e+001,"Montrose","Powderhorn","K/Ar","Plagioclase",772.000000,"15","762","Olson and others (1977)",null]
["Carbonatite","Alkalic complex at Iron Hill","IH-2-2d",-1.07016666667e+002,3.82500000000e+001,"Montrose","Powderhorn/Rudolph Hill","K/Ar","Vermiculite (?)",583.000000,"9","574","Olson and others (1977)",null]
["Carbonatite","Alkalic complex at Iron Hill","IH-23-2a",-1.07054444444e+002,3.82416666662e+001,"Montrose","Rudolph Hill","K/Ar","Vermiculite (?)",562.000000,"9","553","Olson and others (1977)",null]
["Pegmatite","Alkalic complex at Iron Hill","IH-3-3",-1.07023888889e+002,3.82594444443e+001,"Montrose","Powderhorn","K/Ar","Biotite",583.000000,"9","574","Olson and others (1977)",null]
["Nepheline syenite","Alkalic complex at Iron Hill","IH-4",-1.07016666667e+002,3.82583333338e+001,"Montrose","Powderhorn","K/Ar","Biotite",552.000000,"8","543","Olson and others (1977)","May be reset by cross-cutting late-phase diabase dike."]
["Nepheline syenite","Powderhorn district","IH-4",-1.07016666667e+002,3.82583333338e+001,"Montrose","Powderhorn","Rb-Sr","Whole-rock",567.000000,"10","579 ± 10","Olson and others (1977)","Isochron based on 5 mineral-whole-rock samples.  (Sample 4 of 5)."]
["Nepheline syenite","Powderhorn district","IH-4",-1.07016666667e+002,3.82583333338e+001,"Montrose","Powderhorn","Rb-Sr","Biotite",567.000000,"10","579 ± 10","Olson and others (1977)","Isochron based on 5 mineral-whole-rock samples.  (Sample 5 of 5)."]
["Carbonatite","Alkalic complex at Iron Hill","J256",-1.07067222222e+002,3.82433333330e+001,"Montrose","Rudolph Hill","K/Ar","Muscovite",570.000000,"10","561","Olson and others (1977)",null]
["Pyroxenite","Alkalic complex at Iron Hill","J365N",-1.07028611111e+002,3.82430555558e+001,"Montrose","Rudolph Hill","K/Ar","Biotite",576.000000,"10","567","Olson and others (1977)",null]
["Pyroxenite","Powderhorn district","J365N",-1.07028611111e+002,3.82430555558e+001,"Montrose","Rudolph Hill","Rb-Sr","Biotite",567.000000,"10","579 ± 10","Olson and others (1977)","Isochron based on 5 mineral-whole-rock samples.  (Sample 1 of 5)."]
["Augite-biotite-hornblende syenite","Alkalic stocks in northwest part of Powderhorn district","P7406",-1.07092500000e+002,3.83216666668e+001,"Montrose","Powderhorn","K/Ar","Biotite",1397.000000,"40","1,390","Olson and others (1977)",null]
["Ijolite","Alkalic complex at Iron Hill","P8649",-1.07014722222e+002,3.82547222222e+001,"Montrose","Powderhorn","FT","Apatite",55.000000,"12","55 ± 12","Olson and others (1977)","Annealing date due to regional uplift."]
["Ijolite","Alkalic complex at Iron Hill","P8649",-1.07014722222e+002,3.82547222222e+001,"Montrose","Powderhorn","FT","Sphene",550.000000,"54","550 ± 54","Olson and others (1977)",null]
["Ijolite","Alkalic complex at Iron Hill","P-9-901",-1.07011666667e+002,3.82536111107e+001,"Montrose","Powderhorn","K/Ar","Aegirine",741.000000,"23","731","Olson and others (1977)","Spurious date; probable excess radiogenic argon incorporated during crystallization."]
["Biotite-hornblende syenite","McClure Mountain alkaline complex","WM-12-71",-1.05460833333e+002,3.83663888892e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples.  (Sample 3 of 8)."]
["Biotite-hornblende syenite","McClure Mountain alkaline complex","WM-12-71",-1.05460833333e+002,3.83663888892e+001,"Canon City","Iron Mountain","Rb-Sr","Biotite",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples. (Sample 4 of 8)."]
["Syenite","Red syenite dikes in and near the McClure Mountain and Gem Park C","WM-14-71",-1.05478611111e+002,3.83491666664e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",484.000000,"10","495 ± 10","Olson and others (1977)","Isochron based on 4 samples.  (Sample 2 of 4)."]
["Syenite","Red syenite dikes in and near the McClure Mountain and Gem Park C","WM-20-71",-1.05500555555e+002,3.82347222220e+001,"Canon City","Beckwith Mountain","Rb-Sr","Whole-rock",484.000000,"10","495 ± 10","Olson and others (1977)","Isochron based on 4 samples. (Sample 3 of 4)."]
["Biotite-hornblende syenite","McClure Mountain alkaline complex","WM-21-71",-1.05474722222e+002,3.83680555559e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples.  (Sample 5 of 8)."]
["Biotite-hornblende syenite","McClure Mountain alkaline complex","WM-21-71",-1.05474722222e+002,3.83680555559e+001,"Canon City","Iron Mountain","Rb-Sr","Biotite",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples.  (Sample 6 of 8)."]
["Syenite","Red syenite dikes in and near the McClure Mountain and Gem Park C","WM-2-71",-1.05272500000e+002,3.82725000003e+001,"Canon City","Hillside","Rb-Sr","Whole-rock",484.000000,"10","495 ± 10","Olson and others (1977)","Isochron based on 4 samples.  (Sample 1 of 4)."]
["Nepheline syenite","McClure Mountain alkaline complex","WM-4-71",-1.05487222222e+002,3.83238888888e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples.  (Sample 7 of 8)."]
["Nepheline syenite","McClure Mountain alkaline complex","WM-4-71",-1.05487222222e+002,3.83238888888e+001,"Canon City","Iron Mountain","Rb-Sr","Biotite",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples.  (Sample 8 of 8)."]
["Hornblende syenite","McClure Mountain alkaline complex","WM-62-114",-1.05483800658e+002,3.83020249628e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",518.000000,"11","509","Olson and others (1977)",null]
["Mafic nepheline-bearing rock","McClure Mountain alkaline complex","WM-62-115",-1.05483803033e+002,3.83023826394e+001,"Canon City","Iron Mountain","K/Ar","Biotite",516.000000,"17","507","Olson and others (1977)",null]
["Mafic nepheline-bearing rock","McClure Mountain alkaline complex","WM-62-115",-1.05483333333e+002,3.82999999999e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",541.000000,"15","532","Olson and others (1977)",null]
["Hornblende-biotite syenite","McClure Mountain alkaline complex","WM-62-140",-1.05433333333e+002,3.83333333331e+001,"Canon City","Iron Mountain","K/Ar","Biotite",519.000000,"13","510","Olson and others (1977)",null]
["Hornblende-biotite syenite","McClure Mountain alkaline complex","WM-62-140",-1.05433333333e+002,3.83333333331e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",532.000000,"14","523","Olson and others (1977)",null]
["Hornblende-biotite syenite","McClure Mountain alkaline complex","WM-62-143",-1.05483333333e+002,3.83666666664e+001,"Canon City","Iron Mountain","FT","Apatite",293.000000,"62","293 ± 62","Olson and others (1977)","Annealing date due to regional uplift."]
["Hornblende-biotite syenite","McClure Mountain alkaline complex","WM-62-143",-1.05483333333e+002,3.83666666664e+001,"Canon City","Iron Mountain","FT","Sphene",506.000000,"43","506 ± 43","Olson and others (1977)",null]
["Hornblende-biotite syenite","McClure Mountain alkaline complex","WM-62-143",-1.05483333333e+002,3.83666666664e+001,"Canon City","Iron Mountain","K/Ar","Biotite",515.000000,"13","506","Olson and others (1977)",null]
["Hornblende-biotite syenite","McClure Mountain alkaline complex","WM-62-143",-1.05483333333e+002,3.83666666664e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",525.000000,"11","516","Olson and others (1977)",null]
["Syenite","Red syenite dikes in and near the McClure Mountain and Gem Park C","WM-63-169",-1.05450000000e+002,3.83166666665e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",484.000000,"10","495 ± 10","Olson and others (1977)","Isochron based on 4 samples.  (Sample 4 of 4)."]
["Fenite (altered)","Gem Park Complex","WM-63-707",-1.05544444444e+002,3.82672222219e+001,"Canon City","Hillside","K/Ar","Vermiculite",330.000000,"46","323","Olson and others (1977)",null]
["Fenite","Gem Park Complex","WM-63-723",-1.05541666667e+002,3.82666666666e+001,"Canon City","Hillside","K/Ar","Riebeckite",560.000000,"30","551","Olson and others (1977)",null]
["Mafic nepheline-bearing rock","McClure Mountain alkaline complex","WM-66-116c",-1.05483333333e+002,3.83333333331e+001,"Canon City","Iron Mountain","K/Ar","Biotite",519.000000,"13","510","Olson and others (1977)",null]
["Mafic nepheline-bearing rock","McClure Mountain alkaline complex","WM-66-116c",-1.05483333333e+002,3.83333333331e+001,"Canon City","Iron Mountain","K/Ar","Pyroxene",545.000000,"17","536","Olson and others (1977)",null]
["Mafic nepheline-bearing rock","McClure Mountain alkaline complex","WM-66-116c",-1.05483333333e+002,3.83333333331e+001,"Canon City","Iron Mountain","K/Ar","Nepheline",488.000000,"12","479","Olson and others (1977)",null]
["Altered mafic rock","Gem Park Complex","WM-67-1029a",-1.05552777778e+002,3.82597222224e+001,"Canon City","Hillside","K/Ar","Vermiculite",222.000000,"7","217","Olson and others (1977)",null]
["Fenite (altered)","Gem Park Complex","WM-67-728",-1.05544444444e+002,3.82672222219e+001,"Canon City","Hillside","K/Ar","Vermiculite",447.000000,"22","439","Olson and others (1977)",null]
["Biotite-hornblende syenite","McClure Mountain alkaline complex","WM-8-71",-1.05435277777e+002,3.83311111111e+001,"Canon City","Iron Mountain","Rb-Sr","Whole-rock",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples.  (Sample 1 of 8)."]
["Biotite-hornblende syenite","McClure Mountain alkaline complex","WM-8-71",-1.05435277777e+002,3.83311111111e+001,"Canon City","Iron Mountain","Rb-Sr","Biotite",510.000000,"10","521 ± 10","Olson and others (1977)","Isochron based on 8 whole-rock and mineral samples.  (Sample 2 of 8)."]
["Rhyolite/trachydacite","Tincup area, west","Dustin Gulch",-1.06479731025e+002,3.87498506177e+001,"Gunnison","Cumberland Pass","K/Ar","Hornblende",76.300000,"1.7","76.3","Ouimette and others (1991); Ouimette (1995)","location approximate."]
["Rhyolite","Napolean Sill on Gold Hill (?)","Gold Hill",-1.06475663188e+002,3.87232169692e+001,"Gunnison","Cumberland Pass","K/Ar","Feldspar",38.800000,"0.9","38.8","Ouimette and others (1991); Ouimette (1995)",null]
["Trachydacite","Tincup porphyry sill","Hillerton",-1.06476666666e+002,3.87641666670e+001,"Gunnison","Tincup","K/Ar","Biotite",41.400000,"0.9","41.4","Ouimette and others (1991); Ouimette (1995)","Location provided by M. Ouimette (written communication to A. Wilson, USGS, 2004)."]
["Granodiorite","Tincup porphyry sill","Seeton Mine",-1.06490833334e+002,3.87808333336e+001,"Gunnison","Tincup","K/Ar","Biotite",39.700000,"0.9","39.7","Ouimette and others (1991); Ouimette (1995)","Location provided by M. Ouimette (written communication to A. Wilson, USGS, 2004)."]
["Biotite-quartz-plagioclase porphyry","Dike, west of Audubon",null,-1.05611400000e+002,4.01442000001e+001,"Estes Park","Allens Park","FT","Zircon",52.600000,"5.6",null,"Pearson and U.S. Bureau of Mines (1980)",null]
["Granodiorite","Lincoln Porphyry","C-10",-1.06236775771e+002,3.93408984166e+001,"Leadville","Climax","K/Ar","Biotite",65.600000,"Not report","64","Pearson and others (1962)","Location and age recalculation from Wallace (1993, 1995)."]
["Granodiorite","Pando Porphyry","C-12",-1.06257296681e+002,3.92986522831e+001,"Leadville","Leadville North","K/Ar","Biotite",71.800000,"Not report","70","Pearson and others (1962)","Location and age recalculation from Wallace (1993, 1995)."]
["Granodiorite","Johnson Gulch Porphyry","C-21",-1.06262372354e+002,3.92634767184e+001,"Leadville","Leadville North","K/Ar","Biotite",42.100000,"Not report","41","Pearson and others (1962)","Pearson and others (1962) suggest date is too young due to Ar loss.  Recalculated age and location from Wallace (1993, 1995)."]
["Granodiorite","Pando Porphyry (?)","C-7",-1.06483333333e+002,3.93886111114e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",71.800000,"Not report","70","Pearson and others (1962)","Location and recalculated age by Wallace (1993, 1995)."]
["Paragneiss","Turquoise Lake area","C-1",-1.06437500000e+002,3.92833333333e+001,"Leadville","Homestake Reservoir","K/Ar","Biotite",1249.000000,"62","1240","Pearson and others (1966)","Location from Wallace (1993, 1995)."]
["Hornblendite","Homestake area","C-15",-1.06450000000e+002,3.93999999996e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",1249.000000,"62","1240","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Hornblendite","Homestake area","C-15",-1.06450000000e+002,3.93999999996e+001,"Leadville","Mount of the Holy Cross","K/Ar","Hornblende",2018.000000,"10","2020","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Paragneiss","Homestake area","C-16",-1.06395833333e+002,3.94333333329e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",1259.000000,"63","1250","Pearson and others (1966)","Location from Wallace (1993, 1995)."]
["Metalamprophyre","Homestake area","C-17",-1.06395526886e+002,3.93738518690e+001,"Leadville","Pando","K/Ar","Biotite",1328.000000,"66","1320","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Pegmatite","Homestake area","C-18",-1.06333333334e+002,3.93833333330e+001,"Leadville","Pando","K/Ar","Muscovite",1338.000000,"67","1330","Pearson and others (1966)","Location from Wallace (1993, 1995)."]
["Pegmatite","Homestake area","C-19",-1.06317194492e+002,3.93915618481e+001,"Leadville","Pando","K/Ar","Muscovite",1368.000000,"68","1360","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Pegmatite","Homestake area","C-19",-1.06317194492e+002,3.93915618481e+001,"Leadville","Pando","Rb-Sr","Muscovite",1366.000000,"70","1320 ± 70","Pearson and others (1966)",null]
["Granite","St. Kevin Granite","C-2",-1.06445591331e+002,3.92586742398e+001,"Leadville","Homestake Reservoir","K/Ar","Biotite",1209.000000,"60","1200","Pearson and others (1966)","Location and age recalculation from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-20",-1.06400113097e+002,3.93308416140e+001,"Leadville","Homestake Reservoir","K/Ar","Biotite",1209.000000,"60","1200","Pearson and others (1966)","Location and age recalculation from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-20",-1.06400113097e+002,3.93308416140e+001,"Leadville","Homestake Reservoir","Rb-Sr","Biotite",1304.000000,"60","1,260 ± 60","Pearson and others (1966)","Model age.  Location from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-20",-1.06400113097e+002,3.93308416140e+001,"Leadville","Homestake Reservoir","Rb-Sr","Muscovite",1335.000000,"60","1290 ± 60","Pearson and others (1966)","Location from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-20",-1.06400113097e+002,3.93308416140e+001,"Leadville","Homestake Reservoir","K/Ar","Muscovite",1358.000000,"68","1350","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-20",-1.06400113097e+002,3.93308416140e+001,"Leadville","Homestake Reservoir","Rb-Sr","K-feldspar",1480.000000,"130","1430 ± 130","Pearson and others (1966)","Model age.  Location from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-20",-1.06400113097e+002,3.93308416140e+001,"Leadville","Homestake Reservoir","Rb-Sr","Whole-rock",1436.000000,"72","1390","Pearson and others (1966)","Isochron based on 7 samples. (Sample 1 of 7).  Age recalculated by Wallace (1993, 1995)."]
["Granite","Granite of Holy Cross City","C-22",-1.06487564037e+002,3.94193182948e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",1184.000000,"59","1175","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Migmatite","Homestake area","C-23",-1.06478811706e+002,3.94215763476e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",1209.000000,"60","1200","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Migmatite","Homestake area","C-23",-1.06478811706e+002,3.94215763476e+001,"Leadville","Mount of the Holy Cross","K/Ar","Muscovite",1298.000000,"65","1290","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Mylonite","Homestake area","C-24",-1.06478493134e+002,3.94182884128e+001,"Leadville","Mount of the Holy Cross","K/Ar","Whole-rock",332.000000,"16","325","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-25",-1.06425000000e+002,3.93138888892e+001,"Leadville","Homestake Reservoir","K/Ar","Biotite",1309.000000,"65","1300","Pearson and others (1966)","Location and age recalculation from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-3",-1.06475399385e+002,3.92520295225e+001,"Leadville","Homestake Reservoir","K/Ar","Biotite",1239.000000,"62","1230","Pearson and others (1966)","Location and age recalculation from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-3",-1.06475118760e+002,3.92520848075e+001,"Leadville","Homestake Reservoir","Rb-Sr","Biotite",1294.000000,"60","1250 ± 60","Pearson and others (1966)","Model age.  Location from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-3",-1.06475276771e+002,3.92520310766e+001,"Leadville","Homestake Reservoir","Rb-Sr","K-feldspar",1356.000000,"130","1310 ± 130","Pearson and others (1966)","Model age.  Location from Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","C-3",-1.06475365986e+002,3.92521770374e+001,"Leadville","Homestake Reservoir","Rb-Sr","Whole-rock",1436.000000,"72","1390","Pearson and others (1966)","Isochron based on 7 samples. (Sample 6 of 7).  Age recalculated by Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","C-4",-1.06421964114e+002,3.95434130679e+001,"Vail","Minturn","K/Ar","Biotite",1338.000000,"67","1330","Pearson and others (1966)","Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton","C-5",-1.06425000000e+002,3.95427777778e+001,"Vail","Minturn","K/Ar","Biotite",1442.000000,"72","1440","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Migmatite","Red Cliff area","C-6",-1.06377777778e+002,3.95055555558e+001,"Vail","Minturn","K/Ar","Biotite",1368.000000,"68","1360","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Granodiorite","Missouri Creek granodiorite","C-7",-1.06481167180e+002,3.93837670338e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",70.800000,"3","69","Pearson and others (1966)","Age recalculated by Wallace (1993, 1995)."]
["Paragneiss","Homestake area","C-8",-1.06495833333e+002,3.93916666668e+001,"Leadville","Mount of the Holy Cross","K/Ar","Biotite",92.300000,"5","90","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Paragneiss","Homestake area","C-9",-1.06309204570e+002,3.93679464790e+001,"Leadville","Pando","K/Ar","Biotite",1358.000000,"68","1350","Pearson and others (1966)","Location and recalculated age by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","D-1418",-1.06425000000e+002,3.93138888892e+001,"Leadville","Homestake Reservoir","Rb-Sr","Whole-rock",1436.000000,"72","1390","Pearson and others (1966)","Isochron based on 7 samples. (Sample 3 of 7).  Age recalculated by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","D-1419",-1.06416666667e+002,3.93277777776e+001,"Leadville","Homestake Reservoir","Rb-Sr","Whole-rock",1436.000000,"72","1390","Pearson and others (1966)","Isochron based on 7 samples. (Sample 2 of 7).  Age recalculated by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","D-1773",-1.06489662859e+002,3.92593956696e+001,"Leadville","Homestake Reservoir","Rb-Sr","Whole-rock",1436.000000,"72","1390","Pearson and others (1966)","Isochron based on 7 samples. (Sample 5 of 7).  Age recalculated by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","E-2208",-1.06445468704e+002,3.92586757624e+001,"Leadville","Homestake Reservoir","Rb-Sr","Whole-rock",1436.000000,"72","1390","Pearson and others (1966)","Isochron based on 7 samples. (Sample 4 of 7).  Age recalculated by Wallace (1993, 1995)."]
["Granite","St. Kevin Granite","E-2209",-1.06428582452e+002,3.92528600779e+001,"Leadville","Homestake Reservoir","Rb-Sr","Whole-rock",1436.000000,"72","1390","Pearson and others (1966)","Isochron based on 7 samples. (Sample 7 of 7).  Age recalculated by Wallace (1993, 1995)."]
["Pyroxene hornblendite","Mafic enclave in Black Hills laccolith","SP119",-1.04998732142e+002,3.76519288387e+001,"Blanca Peak","Farisita","40Ar/39Ar","Hornblende",36.600000,"0.12","36.6","Penn (1994)","Plateau age.  Considered to have equilibrated in host magma and to date the laccolith."]
["Alkali-feldspar syenite","Radial dike associated with Spanish Peaks intrusive center","SP67",-1.05028952905e+002,3.74703580017e+001,"Alamosa","Cuchara","40Ar/39Ar","Hornblende",21.900000,"0.13","21.9","Penn (1994)","Plateau age.  Location approximate."]
["Monzonite","Radial dike associated with Spanish Peaks intrusive center","SP95",-1.05050000000e+002,3.73400000001e+001,"Alamosa","Cucharas Pass","40Ar/39Ar","Hornblende",23.300000,"0.04","23.3","Penn (1994)","Plateau age."]
["Biotite quartz diorite","West of Horsetooth Reservoir","5-4-6R",-1.05246700000e+002,4.05616999999e+001,"Fort Collins","Horsetooth Reservoir","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)",null]
["Amphibolite","Buckhorn Canyon","0C188Hb",-1.05305000000e+002,4.05650000000e+001,"Fort Collins","Buckhorn Mountain","K/Ar","Hornblende",1546.000000,"50",null,"Peterman and others (1968)",null]
["Quartz monzonite","Log Cabin batholith","1-0-1R",-1.05200000000e+002,4.07617000003e+001,"Fort Collins","Livermore","Rb-Sr","Whole-rock",1390.000000,"30",null,"Peterman and others (1968)","Isochron based on 6 samples."]
["Biotite quartz monzonite","Boulder Creek granodiorite","14-A-12R",-1.05396700000e+002,4.04083000001e+001,"Estes Park","Glen Haven","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Approximate fit to Boulder Creek isochron."]
["Biotite granodiorite","Boulder Creek granodiorite","14-A-20R",-1.05415000000e+002,4.04049999999e+001,"Estes Park","Glen Haven","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Approximate fit to Boulder Creek isochron."]
["Hornblende-biotite granite","Sherman Granite","3-0-8B",-1.05208300000e+002,4.07499999996e+001,"Fort Collins","Livermore/ LaPorte","K/Ar","Biotite",1263.000000,"40",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Hornblende-biotite granite","Sherman Granite","3-0-8Hb",-1.05208300000e+002,4.07499999996e+001,"Fort Collins","Livermore/ LaPorte","K/Ar","Hornblende",1351.000000,"40",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Hornblende-biotite granite","Sherman Granite","3-0-8R",-1.05208300000e+002,4.07499999996e+001,"Fort Collins","Livermore/ LaPorte","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Biotite-hornblende granite","Sherman Granite","31-42aR",-1.05498300000e+002,4.09200000003e+001,"Fort Collins","Cherokee Park","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron."]
["Biotite quartz diorite","West of Horsetooth Reservoir","5-4-1R",-1.05198300000e+002,4.05667000002e+001,"Fort Collins","Horsetooth Reservoir","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Small concordant body."]
["Biotite quartz diorite","West of Horsetooth Reservoir","5-4-2R",-1.05196700000e+002,4.05500000002e+001,"Fort Collins","Horsetooth Reservoir","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Small concordant body."]
["Biotite quartz diorite","West of Horsetooth Reservoir","5-4-3R",-1.05196700000e+002,4.05500000002e+001,"Fort Collins","Horsetooth Reservoir","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Small concordant body."]
["Pegmatite","West of Horsetooth Reservoir","5-5-8Mi",-1.05173300000e+002,4.05399999997e+001,"Fort Collins","Horsetooth Reservoir","Rb-Sr","Microcline",1664.000000,"40",null,"Peterman and others (1968)",null]
["Retrograde muscovite after sillimanite","Stove Prairie","6-2-49Mu",-1.05361700000e+002,4.06183000000e+001,"Fort Collins","Buckhorn Mountain","Rb-Sr","Muscovite",1390.000000,"50",null,"Peterman and others (1968)",null]
["Retrograde muscovite after sillimanite","Stove Prairie","6-2-49Mu",-1.05361700000e+002,4.06183000000e+001,"Fort Collins","Buckhorn Mountain","K/Ar","Muscovite",1388.000000,"40",null,"Peterman and others (1968)",null]
["Biotite quartz diorite","West of Horsetooth Reservoir","6-3-21R",-1.05286700000e+002,4.05766999998e+001,"Fort Collins","Buckhorn Mountain","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Small concordant body."]
["Biotite quartz diorite","West of Horsetooth Reservoir","6-3-32R",-1.05293300000e+002,4.05749999997e+001,"Fort Collins","Buckhorn Mountain","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Small concordant body."]
["Pegmatite","Buckhorn Canyon","6-4-98cM",-1.05330000000e+002,4.05717000004e+001,"Fort Collins","Buckhorn Mountain","Rb-Sr","Microcline",1458.000000,"40",null,"Peterman and others (1968)","Mineral isochron."]
["Pegmatite","Buckhorn Canyon","6-4-98cMu",-1.05330000000e+002,4.05717000004e+001,"Fort Collins","Buckhorn Mountain","Rb-Sr","Muscovite",1458.000000,"40",null,"Peterman and others (1968)","Mineral isochron."]
["Pegmatite","Buckhorn Canyon","6-4-98cT",-1.05330000000e+002,4.05717000004e+001,"Fort Collins","Buckhorn Mountain","Rb-Sr","Tourmaline",1458.000000,"40",null,"Peterman and others (1968)","Mineral isochron."]
["Biotite-hornblende granite","Sherman Granite","81-46R",-1.05374400000e+002,4.09167000001e+001,"Fort Collins","Virginia Dale","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Quartz monzonite","Log Cabin batholith","C-211R",-1.05296700000e+002,4.07283000003e+001,"Fort Collins","Poudre Park","Rb-Sr","Whole-rock",1390.000000,"30",null,"Peterman and others (1968)","Isochron based on 6 samples."]
["Hornblende-biotite quartz monzonite","Sherman Granite","C-235.1R",-1.05243300000e+002,4.07682999996e+001,"Fort Collins","Livermore","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals from Sherman Granite."]
["Quartz monzonite","Log Cabin batholith","C-239R",-1.05230000000e+002,4.07633000003e+001,"Fort Collins","Livermore","Rb-Sr","Whole-rock",1390.000000,"30",null,"Peterman and others (1968)","Isochron based on 6 samples."]
["Biotite quartz monzonite","Sherman Granite","C-28.1R",-1.05293300000e+002,4.07133000004e+001,"Fort Collins","Poudre Park","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron."]
["Biotite-quartz monzonite","Mount Olympus pluton","D1192R",-1.05438300000e+002,4.03917000002e+001,"Estes Park","Glen Haven","Rb-Sr","Whole-rock",1419.000000,"20",null,"Peterman and others (1968)","Isochron, 3 samples."]
["Quartz Monzonite","Longs Peak -St. Vrain pluton","D1196R",-1.05343300000e+002,4.02582999996e+001,"Estes Park","Pinewood Lake","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Quartz monzonite","Longs Peak -St. Vrain pluton","D1198R",-1.05320000000e+002,4.02383000003e+001,"Estes Park","Lyons","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Quartz monzonite","Longs Peak -St. Vrain pluton","D1199R",-1.05305000000e+002,4.03132999997e+001,"Estes Park","Pinewood Lake","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Granite","Longs Peak -St. Vrain pluton","D1200R",-1.05290000000e+002,4.02483000000e+001,"Estes Park","Lyons","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Granite","Longs Peak -St. Vrain pluton","D1206R",-1.05435000000e+002,4.01749999998e+001,"Estes Park","Raymond","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Quartz monzonite","Longs Peak -St. Vrain pluton","D1208R",-1.05353300000e+002,4.01783000000e+001,"Estes Park","Lyons","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Quartz monzonite","Longs Peak -St. Vrain pluton","D1209R",-1.05355000000e+002,4.01833000002e+001,"Estes Park","Lyons","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Granite","Longs Peak -St. Vrain pluton","D1210R",-1.05340000000e+002,4.02033000003e+001,"Estes Park","Lyons","Rb-Sr","Whole-rock",1419.000000,"30",null,"Peterman and others (1968)","Isochron, 8 samples."]
["Quartz monzonite","Log Cabin batholith","E-30-1M",-1.05385000000e+002,4.08700000004e+001,"Fort Collins","Haystack Gulch","Rb-Sr","Microcline",1380.000000,"40",null,"Peterman and others (1968)","Isochron based on 6 samples.  Muscovite-microcline-whole rock isochron."]
["Quartz monzonite","Log Cabin batholith","E-30-1Mu",-1.05385000000e+002,4.08700000004e+001,"Fort Collins","Haystack Gulch","Rb-Sr","Muscovite",1380.000000,"40",null,"Peterman and others (1968)","Isochron based on 6 samples.  Muscovite-microcline-whole rock isochron."]
["Quartz monzonite","Log Cabin batholith","E-30-1R",-1.05385000000e+002,4.08700000004e+001,"Fort Collins","Haystack Gulch","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","Isochron based on 6 samples."]
["Quartz monzonite","Log Cabin batholith","E-30-1R",-1.05385000000e+002,4.08700000004e+001,"Fort Collins","Haystack Gulch","Rb-Sr","Whole-rock",1380.000000,"40",null,"Peterman and others (1968)","Isochron based on 6 samples.  Muscovite-microcline-whole rock isochron."]
["Porphyritic biotite quartz monzonite","Sherman Granite","E-33-4B",-1.05471700000e+002,4.09982999998e+001,"Fort Collins","Cherokee Park","Rb-Sr","Biotite",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Porphyritic biotite quartz monzonite","Sherman Granite","E-33-4M",-1.05471700000e+002,4.09982999998e+001,"Fort Collins","Cherokee Park","Rb-Sr","Microcline",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Porphyritic biotite quartz monzonite","Sherman Granite","E-33-4R",-1.05471700000e+002,4.09982999998e+001,"Fort Collins","Cherokee Park","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Biotite-quartz monzonite","Mount Olympus pluton","GH-40R",-1.05478300000e+002,4.03783000003e+001,"Estes Park","Glen Haven","Rb-Sr","Whole-rock",1419.000000,"20",null,"Peterman and others (1968)","Isochron, 3 samples."]
["Quartz-biotite-hornblende gneiss","Near Golden","HP-13R",-1.05258300000e+002,3.97417000001e+001,"Denver West","Evergreen","Rb-Sr","Whole-rock",1728.000000,"30",null,"Peterman and others (1968)","Isochron from 7 samples."]
["Biotite quartz monzonite","Boulder Creek granodiorite","HP-14R",-1.05401700000e+002,3.98700000004e+001,"Denver West","Blackhawk","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Isochron based on 4 samples.  Rock-mineral isochron for this sample."]
["Biotite quartz monzonite","Boulder Creek granodiorite","HP-14R",-1.05401700000e+002,3.98700000004e+001,"Denver West","Blackhawk","Rb-Sr","Microcline",1312.000000,"70",null,"Peterman and others (1968)","Isochron based on 4 samples.  Rock-mineral isochron."]
["Biotite quartz monzonite","Boulder Creek granodiorite","HP-14R",-1.05401700000e+002,3.98700000004e+001,"Denver West","Blackhawk","Rb-Sr","Plagioclase",1312.000000,"70",null,"Peterman and others (1968)","Isochron based on 4 samples.  Rock-mineral isochron for this sample."]
["Biotite granodiorite","Boulder Creek granodiorite","HP-15R",-1.05450000000e+002,3.99867000001e+001,"Denver West","Tungsten","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Isochron based on 4 samples."]
["Biotite granodiorite","Boulder Creek granodiorite","HP-16R",-1.05431700000e+002,3.99933000004e+001,"Denver West","Tungsten","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Isochron based on 4 samples."]
["Hornblende-biotite granodiorite","Boulder Creek granodiorite","HP-17R",-1.05381700000e+002,4.00050000001e+001,"Estes Park","Gold Hill","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Isochron, 4 samples."]
["Biotite quartz monzonite","Boulder Creek granodiorite","HP-18R",-1.05330000000e+002,4.00116999996e+001,"Estes Park","Boulder","Rb-Sr","Whole-rock",1664.000000,"40",null,"Peterman and others (1968)","Isochron based on 4 samples."]
["Sillimanite-biotite-quartz gneiss","Near Morrison","HP-5R",-1.05205000000e+002,3.96533000000e+001,"Denver West","Morrison","Rb-Sr","Whole-rock",1728.000000,"30",null,"Peterman and others (1968)","Isochron from 7 samples."]
["Muscovite-biotite-quartz-feldspar gneiss","Near Idaho Springs","HP-7R",-1.05440000000e+002,3.97450000003e+001,"Denver West","Squaw Pass","Rb-Sr","Whole-rock",1728.000000,"30",null,"Peterman and others (1968)","Isochron from 7 samples."]
["Amphibolite","Lower Thompson Canyon","NFR-128Hb",-1.05243300000e+002,4.04182999997e+001,"Estes Park","Masonville","K/Ar","Hornblende",1516.000000,"50",null,"Peterman and others (1968)",null]
["Biotite quartz monzonite","Mount Olympus pluton","PAP-1R",-1.05488300000e+002,4.03733000001e+001,"Estes Park","Panorama Peak","Rb-Sr","Whole-rock",1419.000000,"20",null,"Peterman and others (1968)","Isochron, 3 samples."]
["Quartz monzonite","Log Cabin batholith","W-2-18R",-1.05196700000e+002,4.07716999999e+001,"Fort Collins","Livermore","Rb-Sr","Whole-rock",1390.000000,"30",null,"Peterman and others (1968)","Isochron based on 6 samples."]
["Quartz monzonite","Log Cabin batholith","W-2-20R",-1.05198300000e+002,4.07666999996e+001,"Fort Collins","Livermore","Rb-Sr","Whole-rock",1390.000000,"30",null,"Peterman and others (1968)","Isochron based on 6 samples."]
["Hornblende-biotite quartz monzonite","Sherman Granite","W-2-7R",-1.05203300000e+002,4.07767000001e+001,"Fort Collins","Livermore","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals."]
["Hornblende-biotite quartz monzonite","Sherman Granite","W-5-15R",-1.05223300000e+002,4.07467000004e+001,"Fort Collins","Laporte","Rb-Sr","Whole-rock",1380.000000,"30",null,"Peterman and others (1968)","10 point isochron for 8 rocks and 2 minerals.  U-Pb date on Sherman Granite just north of 41 is 1412¦ Ma from concordia diagram based on 15 samples from drill core (Aleinikoff, 1983)."]
["Monzogranite","Rawah pluton","C87-100",-1.05650833333e+002,4.05883333337e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1695.000000,"20","1695","Plymate and others (2005)","Concordia, upper intercept; composite of 9 fractions from 3 samples.  Upper intercept of four fractions of only this sample yields age of 1724 ± 17 Ma."]
["Monzogranite, melanocratic","Rawah pluton","C87-87A",-1.05725833333e+002,4.05811111114e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1673.000000,"6","1673","Plymate and others (2005)","Concordia, upper intercept; composite of 3 fractions from 2 samples.  207Pb/206Pb ages of two fractions from only this sample are 1655 and 1660 Ma."]
["Granodiorite","Rawah pluton","C88-231A",-1.05663611111e+002,4.06116666664e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1691.000000,"9","1691","Plymate and others (2005)","Concordia, upper intercept; composite of 6 fractions from 2 samples.  Upper intercept of 3 fractions of only this sample yields age of 1689 ± 3 Ma."]
["Monzogranite","Tectonized Granite pluton, near Comanche Reservoir","C89-266",-1.05662500000e+002,4.06175000000e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1695.000000,"20","1695","Plymate and others (2005)","Concordia, upper intercept; composite of 9 fractions from 3 samples.  Upper intercept of three fractions of only this sample yields age of 1693 ± 5 Ma."]
["Monzogranite, melanocratic","Tectonized Granite pluton, near Comanche Reservoir","C89-335",-1.05721388889e+002,4.06108333330e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1673.000000,"6","1673","Plymate and others (2005)","Concordia, upper intercept; composite of 3 fractions from 2 samples.  207Pb/206Pb age of one fraction from only this sample is 1654 Ma."]
["Monzogranite","St. Vrain pluton","C90-421",-1.05673055556e+002,4.05419444445e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1393.000000,"25","1393","Plymate and others (2005)","Concordia, upper intercept; composite of 4 fractions from 2 samples.  Upper intercept of 2 fractions of only this sample yields age of 1406 ± 2 Ma."]
["Tonalite","Near Crown Point","C92-556",-1.05708333333e+002,4.06197222221e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1702.000000,"6","1702","Plymate and others (2005)","Concordia, upper intercept; three data points."]
["Monzogranite","Rawah pluton","C92-561",-1.05673611111e+002,4.05741666663e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1695.000000,"20","1695","Plymate and others (2005)","Concordia, upper intercept; composite of 9 fractions from 3 samples.  207Pb/206Pb ages of two fractions from only this sample are 1638 and 1656 Ma."]
["Granodiorite","Rawah pluton","C94-768",-1.05648611111e+002,4.06136111113e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1691.000000,"9","1691","Plymate and others (2005)","Concordia, upper intercept; composite of 6 fractions from 2 samples.  Upper intercept of 3 fractions of only this sample yields age of 1706 ± 6 Ma."]
["Felsic gneiss","Tectonized Granite pluton, near Comanche Reservoir","C94-775",-1.05627222222e+002,4.05955555560e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1764.000000,"12","1764","Plymate and others (2005)","Concordia, upper intercept; three data points."]
["Monzogranite","St. Vrain pluton","C95-781",-1.05716388889e+002,4.05841666668e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1393.000000,"25","1393","Plymate and others (2005)","Concordia, upper intercept; composite of 4 fractions from 2 samples.  Upper intercept of 2 fractions of only this sample yields age of 1404 ± 4 Ma."]
["Monzogranite","St. Vrain pluton","C96-801C",-1.05643055555e+002,4.06130555560e+001,"Fort Collins","Comanche Peak","U-Pb","Zircon",1276.000000,"1.8","1276","Plymate and others (2005)","207Pb/206Pb age of single analysis."]
["Quartz monzonite","Rawah pluton","82-17",-1.05800000000e+002,4.06832999998e+001,"Fort Collins","Boston Peak","U-Pb","Zircon",1720.000000,"8",null,"Premo and Van Schmus (1989)",null]
["Granodiorite","Boulder Creek batholith","83-01",-1.05315000000e+002,4.00332999997e+001,"Estes Park","Boulder","U-Pb","Zircon",1714.000000,"6",null,"Premo and Van Schmus (1989)",null]
["Granite","Mount Antero granite","No sample number",-1.06239722222e+002,3.85924999996e+001,"Gunnison","Maysville","K/Ar","Biotite",31.600000,"1.1","30.8","Pulfrey (1971)","Location approximate.  Mineral concentrate was 85 percent biotite, 10 percent muscovite, and 5 percent groundmass and accessory minerals."]
["Phonotephrite","Cripple Creek intrusive complex","CC40a",-1.05129828507e+002,3.87360227330e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","K-feldspar",31.100000,"0.11","31.15","Rampe and others (2005)","Plateau age.  Location approximate."]
["Phonotephrite","Cripple Creek intrusive complex","CC40b",-1.05129848731e+002,3.87360385296e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Matrix",31.200000,"0.1","31.17","Rampe and others (2005)","Integrated plateau age.  Location approximate."]
["Lamprophyre","Cripple Creek intrusive complex; Pinto dike","CC57",-1.05133282624e+002,3.87372381218e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Phlogopite",30.400000,"0.21","30.41","Rampe and others (2005)","Weighted mean plateau age.  Location approximate."]
["Tephriphonolite","Cripple Creek intrusive complex","CC58",-1.05132494102e+002,3.87367871100e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Hornblende",31.100000,"0.04","31.12","Rampe and others (2005)","Plateau age.  Location approximate."]
["Foid syenitoid","Cripple Creek intrusive complex; xenolith in Cresson Pipe","CC70",-1.05143178673e+002,3.87277849036e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","K-feldspar",29.000000,"0.08","28.95","Rampe and others (2005)","Final step in spectrum interpreted to indicate emplacement age of Cresson Pipe.  Location approximate."]
["Foid syenitoid","Cripple Creek intrusive complex; xenolith in Cresson Pipe","CC70b",-1.05143168381e+002,3.87277966947e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","K-feldspar",28.400000,"0.21","28.38","Rampe and others (2005)","Weighted mean spectrum age interpreted to indicate emplacement age of Cresson Pipe.  Location approximate."]
["Phonotephrite","Cripple Creek intrusive complex, Isabella dike","CC73",-1.05132195490e+002,3.87363033458e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Aegerine",32.200000,"1","27.8","Rampe and others (2005)","Flat part of spectrum; probably aegerine. Location approximate."]
["Phonolite","Cripple Creek intrusive complex","CC74",-1.05131944445e+002,3.87358333331e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","K-feldspar",31.600000,"0.32","31.59","Rampe and others (2005)","Four-point isochron age.  Location approximate."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",523.400000,"2.9","523.4","Renne (1995)","Location approximate.  Mean total-fusion age."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",523.100000,"2.6","523.1","Renne and others (1998)","Location approximate.  Date calculated using GA-1550 as the primary standard."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",525.100000,"2.3","525.1","Renne and others (1998)","Location approximate.  Date calculated using GHC-305 as the primary standard."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",510.100000,"9","510.1","Rex and others (1993)","Location approximate.  Integrated age."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",516.700000,"9.1","516.7","Rex and others (1993)","Location approximate.  Integrated age."]
["Altered wallrock","The Patch","125",-1.05517500000e+002,3.97925000000e+001,"Denver West","Central City","K/Ar","Sericite",57.500000,"1.2",null,"Rice and others (1982)",null]
["Altered wallrock","The Patch","125A",-1.05525000000e+002,3.97925000000e+001,"Denver West","Central City","K/Ar","Sericite",53.800000,"1.1",null,"Rice and others (1982)",null]
["Unnamed","The Patch","125A",-1.05525000000e+002,3.97925000000e+001,"Denver West","Central City","K/Ar","Sericite",53.700000,"1.1",null,"Rice and others (1982)",null]
["Hornblende quartz monzonite","Apex stock","150",-1.05569032625e+002,3.98613237488e+001,"Denver West","Central City","K/Ar","Hornblende",79.300000,"3.1",null,"Rice and others (1982)",null]
["Hornblende quartz monzonite","Apex stock","150",-1.05569032625e+002,3.98613237488e+001,"Denver West","Central City","K/Ar","Hornblende",76.700000,"3.1",null,"Rice and others (1982)",null]
["Altered wallrock","Dump of Anchor mine","157",-1.05509400000e+002,3.97808000003e+001,"Denver West","Central City","K/Ar","Sericite",59.600000,"1.6",null,"Rice and others (1982)",null]
["Altered wallrock","Dump of Elkhorn mine","159",-1.05504400000e+002,3.97835999998e+001,"Denver West","Central City","K/Ar","Sericite",54.900000,"1.3",null,"Rice and others (1982)",null]
["breccia matrix in Proterozoic rock","Gold Cup pipe","246A",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",118.000000,"3",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["breccia matrix in Proterozoic rock","Gold Cup pipe","246B",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",120.000000,"2",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["breccia matrix in Proterozoic rock","Gold Cup pipe","246C",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",96.000000,"2",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["Altered wallrock","Upper Eureka Gulch","247",-1.05547500000e+002,3.97992000004e+001,"Denver West","Central City","K/Ar","Sericite",305.000000,"6",null,"Rice and others (1982)",null]
["Altered wallrock","Dump of East Notaway mine","256",-1.05501900000e+002,3.97878000001e+001,"Denver West","Central City","K/Ar","Sericite",52.700000,"1.2",null,"Rice and others (1982)",null]
["Altered wallrock","Dump of Alcan mine","270",-1.05521400000e+002,3.97613999999e+001,"Denver West","Central City","K/Ar","Sericite",58.400000,"1.2",null,"Rice and others (1982)",null]
["Altered wallrock","Upper Gibson Gulch","276",-1.05516400000e+002,3.97647000000e+001,"Denver West","Central City","K/Ar","Sericite",55.900000,"1.5",null,"Rice and others (1982)",null]
["Syenite","Dike, south of Idaho Springs","293C",-1.05511700000e+002,3.97408000000e+001,"Denver West","Idaho Springs","K/Ar","Whole-rock",65.200000,"1.4",null,"Rice and others (1982)","2-5 mm size fraction."]
["Syenite","Dike, south of Idaho Springs","293C",-1.05511700000e+002,3.97408000000e+001,"Denver West","Idaho Springs","K/Ar","Whole-rock",61.600000,"1.3",null,"Rice and others (1982)","1-2 mm size fraction."]
["Biotite quartz latite","Dike on Chicago Creek","297",-1.05581700000e+002,3.97139000002e+001,"Denver West","Idaho Springs","K/Ar","Biotite",61.200000,"1.3",null,"Rice and others (1982)",null]
["Biotite quartz latite","Dike on Chicago Creek","297",-1.05581700000e+002,3.97139000002e+001,"Denver West","Idaho Springs","K/Ar","Biotite",58.400000,"1.2",null,"Rice and others (1982)",null]
["Biotite quartz latite","Dike on Chicago Creek","297",-1.05581700000e+002,3.97139000002e+001,"Denver West","Idaho Springs","K/Ar","Biotite",57.600000,"1.2",null,"Rice and others (1982)",null]
["Biotite granodiorite","Stock on Fall River","298",-1.05566700000e+002,3.97750000000e+001,"Denver West","Central City","K/Ar","Biotite",57.600000,"1.2",null,"Rice and others (1982)",null]
["Biotite granodiorite","Stock on Fall River","298",-1.05566700000e+002,3.97750000000e+001,"Denver West","Central City","K/Ar","Biotite",57.000000,"1.2",null,"Rice and others (1982)",null]
["Altered wallrock","Dump of Saratoga mine","302",-1.05508300000e+002,3.97810999997e+001,"Denver West","Central City","K/Ar","Sericite",56.900000,"2.1",null,"Rice and others (1982)",null]
["Bostonite","Dike on Bellevue Mountain","78",-1.05542800000e+002,3.97656000002e+001,"Denver West","Central City","K/Ar","Whole-rock",62.600000,"1.3",null,"Rice and others (1982)","1-2 mm size fraction."]
["Bostonite","Dike on Bellevue Mountain","78",-1.05542800000e+002,3.97656000002e+001,"Denver West","Central City","K/Ar","Whole-rock",63.300000,"2.2",null,"Rice and others (1982)","2-5 mm size fraction."]
["Matrix of breccia","Gold Cup Pipe, brecciated Proterozoic rock","88A",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",162.000000,"3",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["Fragments of pegmatitic muscovite in breccia","Gold Cup Pipe, brecciated Proterozoic rock","88B",-1.05517275856e+002,3.98139823445e+001,"Denver West","Central City","K/Ar","Muscovite",1360.000000,"30",null,"Rice and others (1982)","Regional mica age."]
["Fragments of pegmatitic muscovite in breccia","Gold Cup Pipe","88C",-1.05517275856e+002,3.98139823445e+001,"Denver West","Central City","K/Ar","Muscovite",1350.000000,"30",null,"Rice and others (1982)","Regional mica age."]
["Matrix of breccia","Gold Cup Pipe, brecciated Proterozoic rock","88F",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",124.000000,"3",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["Matrix of breccia","Gold Cup Pipe, brecciated Proterozoic rock","88F",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",114.000000,"3",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["Matrix of breccia","Gold Cup Pipe, brecciated Proterozoic rock","88H",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",138.000000,"3",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["Matrix of breccia","Gold Cup Pipe, brecciated Proterozoic rock","88H",-1.05517200000e+002,3.98138999999e+001,"Denver West","Central City","K/Ar","Sericite",132.000000,"3",null,"Rice and others (1982)","Small admixtures of mica from brecciated Proterozoic rock."]
["Syenite","Elkhorn stock","91",-1.05498900000e+002,3.97714000004e+001,"Denver West","Blackhawk","K/Ar","Whole-rock",84.300000,"2.2",null,"Rice and others (1982)","2-5 mm size fraction."]
["Syenite","Elkhorn stock","91",-1.05498900000e+002,3.97714000004e+001,"Denver West","Blackhawk","K/Ar","Whole-rock",77.500000,"2.4",null,"Rice and others (1982)","1-2 mm size fraction."]
["Altered wallrock","Bobtail Hill","E31",-1.05495800000e+002,3.97971999999e+001,"Denver West","Blackhawk","K/Ar","Sericite",76.000000,"2",null,"Rice and others (1982)",null]
["Altered wallrock","Carroll mine","K13",-1.05525800000e+002,3.98056000004e+001,"Denver West","Central City","K/Ar","Sericite",78.000000,"2.00",null,"Rice and others (1982)",null]
["Altered wallrock","Dump of Winabago mine","K19",-1.05521900000e+002,3.98056000004e+001,"Denver West","Central City","K/Ar","Sericite",340.000000,"7",null,"Rice and others (1982)",null]
["Altered wallrock","Dump of Clay Co. mine","Y37",-1.05487800000e+002,3.97881000004e+001,"Denver West","Blackhawk","K/Ar","Sericite",54.400000,"1.3",null,"Rice and others (1982)",null]
["Vein material","Sweet Home Mine","A",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","U-Pb","Apatite",24.800000,"0.5","24.8","Romer and Lueders (2006)","206Pb/204Pb vs. 238U/204Pb isochron age.  MSWD = 1.0."]
["Vein material","Sweet Home Mine","H",-1.06115277778e+002,3.93124999997e+001,"Leadville","Alma","U-Pb","Huebnerite",25.700000,"0.3","25.7","Romer and Lueders (2006)","Weighted average of three 206Pb/238U ages from same crystal."]
["Tonalitic gneiss","Twin Peaks pluton","CO92-1",-1.05535226847e+002,3.75705033732e+001,"Blanca Peak","Twin Peaks","U-Pb","Zircon",1732.000000,"3.7","1732.10","Sabin (1994)","Concordia, upper intercept."]
["Gabbroic gneiss","Gabbro of Little Bear","CO92-28",-1.05502750000e+002,3.75698611107e+001,"Blanca Peak","Twin Peaks","U-Pb","Zircon",1728.000000,"2.3","1728","Sabin (1994)","Concordia, upper intercept."]
["Mixed gneiss","Medano Creek","CO92-3",-1.05468666666e+002,3.78205555557e+001,"Blanca Peak","Twin Peaks","U-Pb","Zircon",1696.000000,"2.4","1695.50","Sabin (1994)","Concordia, upper intercept."]
["Hornblende gneiss","LaVeta Pass","CO92-35",-1.05343513535e+002,3.74914196605e+001,"Alamosa","Trinchera Ranch","U-Pb","Zircon",1675.000000,"168","1675","Sabin (1994)","Concordia, upper intercept."]
["Quartz diorite gneiss","Zapata Creek pluton","CO93-3",-1.05522777777e+002,3.76081944442e+001,"Blanca Peak","Twin Peaks","U-Pb","Zircon",1749.000000,"3.8","1749.10","Sabin (1994)","Concordia, upper intercept."]
["Dioritic gneiss","Blanca Peak pluton","CO93-6",-1.05541111111e+002,3.76218055554e+001,"Blanca Peak","Twin Peaks","U-Pb","Zircon",1745.000000,"24","1745","Sabin (1994)","Concordia, upper intercept."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","K/Ar","Hornblende",520.000000,"1.7","520.4","Samson and Alexander (1987)","Location approximate."]
["Andesite","Lowest outcrop in South Park formation","323",-1.05916900000e+002,3.92547000000e+001,"Bailey","Como","K/Ar","Whole-rock",57.400000,"2.6",null,"Sawatsky (1967); Bryant and others (1981)",null]
["Granite","Climax porphyritic granite","G-MO146",-1.06166331489e+002,3.93686726348e+001,"Leadville","Climax","K/Ar","Muscovite",30.300000,"1","29.5","Schassberger (1972)","Age recalculated by and location from Wallace (1993, 1995)."]
["Mineralized granite","Urad mine","No. 3",-1.05825000000e+002,3.97555999996e+001,"Denver West","Berthoud Pass","K/Ar","Sericite",26.700000,"0.90",null,"Schassberger (1972)",null]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","U-Pb","Zircon",524.000000,"0.74","523.98","Schoene and Bowring (2006)","Location approximate.  Date is a weighted mean 207Pb/235U age based on ten analyses of chemically abraded zircons."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","U-Pb","Baddeleyite",522.000000,"1.03","522.41","Schoene and Bowring (2006)","Location approximate.  Date is a weighted mean 207Pb/235U age based on analyses of four fractions.  Open isotopic system behavior is evident; doubtful that this is a crystallization age."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","U-Pb","Titanite",523.000000,"1.27","523.26","Schoene and Bowring (2006)","Location approximate.  Date is a weighted mean 207Pb/235U age based on analyses of eight fractions."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","U-Pb","Apatite",523.000000,"2","523.51","Schoene and Bowring (2006)","Location approximate.  Date is a weighted mean 207Pb/235U age based on analyses of six fractions."]
["Quartzo feldspathic schist","North of Moose Mountain shear zone","CL1-96",-1.05242200000e+002,4.03719000003e+001,"Estes Park","Carter Lake Reservoir","U-Pb","Zircon (detrital)",1800.000000,"Not report",null,"Selverstone and others (2000)","1758 to ~3450; peak at 1800. SHRIMP data, 51 determinations."]
["Quartzo feldspathic schist","South of Moose Mountain shear zone","BT150LY",-1.05323600000e+002,4.02457999998e+001,"Estes Park","Lyons","U-Pb","Zircon (detrital)",1825.000000,"Not report",null,"Selverstone and others (2000)","Peak at 1825; none>2650.  SHRIMP data, 47 determinations."]
["Rhyolite","Dike associated with Mount Aetna cauldron","63-B-88",-1.06377192363e+002,3.87749741804e+001,"Gunnison","Tincup","FT","Zircon",33.400000,"1.4","33.4","Shannon (1988)","Intrusive tuff dike."]
["Rhyolite","Mount Aetna cauldron","63-B-88",-1.06377192363e+002,3.87749741804e+001,"Gunnison","Tincup","FT","Apatite",33.700000,"3.4","33.7","Shannon (1988)",null]
["Granite","North Fork intrusion","84-280",-1.06241551188e+002,3.85928711696e+001,"Gunnison","Garfield","FT","Zircon",20.000000,"2.7","20","Shannon (1988)",null]
["Granite","North Fork intrusion","84-280",-1.06241551188e+002,3.85928711696e+001,"Gunnison","Garfield","FT","Apatite",19.700000,"2.7","19.7","Shannon (1988)",null]
["Granite","North Fork intrusion","84-280",-1.06241551188e+002,3.85928711696e+001,"Gunnison","Garfield","FT","Monazite",6.200000,"0.6","6.2","Shannon (1988)",null]
["Rhyodacite","Intracauldron Badger Creek Tuff","84-282",-1.06344722222e+002,3.86122222225e+001,"Gunnison","Garfield","FT","Sphene",35.400000,"3.5","35.4","Shannon (1988)",null]
["Rhyodacite","Intracauldron Badger Creek Tuff","84-282",-1.06344722222e+002,3.86122222225e+001,"Gunnison","Garfield","FT","Allanite",35.900000,"4.6","35.9","Shannon (1988)",null]
["Rhyodacite","Intracauldron Badger Creek Tuff","84-282",-1.06344722222e+002,3.86122222225e+001,"Gunnison","Garfield","FT","Zircon",31.200000,"2.2","31.2","Shannon (1988)",null]
["Rhyodacite","Intracauldron Badger Creek Tuff","84-282",-1.06344722222e+002,3.86122222225e+001,"Gunnison","Garfield","FT","Apatite",28.200000,"2.6","28.2","Shannon (1988)",null]
["Granodiorite","Mount Aetna resurgent intrusion","84-290",-1.06332500000e+002,3.86036111107e+001,"Gunnison","Garfield","FT","Sphene",35.500000,"3.7","35.5","Shannon (1988)",null]
["Granodiorite","Mount Aetna resurgent intrusion","84-290",-1.06332500000e+002,3.86036111107e+001,"Gunnison","Garfield","FT","Allanite",32.900000,"4.6","32.9","Shannon (1988)",null]
["Granodiorite","Mount Aetna resurgent intrusion","84-290",-1.06332500000e+002,3.86036111107e+001,"Gunnison","Garfield","FT","Zircon",30.400000,"2.1","30.4","Shannon (1988)",null]
["Granodiorite","Mount Aetna resurgent intrusion","84-290",-1.06332500000e+002,3.86036111107e+001,"Gunnison","Garfield","FT","Apatite",29.800000,"2.5","29.8","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","84-295",-1.06431666667e+002,3.87066666667e+001,"Gunnison","Cumberland Pass","FT","Sphene",41.200000,"3.1","41.2","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","84-295",-1.06431666667e+002,3.87066666667e+001,"Gunnison","Cumberland Pass","FT","Allanite",38.800000,"3.9","38.8","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","84-295",-1.06431666667e+002,3.87066666667e+001,"Gunnison","Cumberland Pass","FT","Zircon",32.700000,"2.6","32.7","Shannon (1988)",null]
["Granite","California intrusion","84-299",-1.06203746872e+002,3.86486531014e+001,"Gunnison","Mount Antero","FT","Zircon",29.300000,"2.8","29.3","Shannon (1988)",null]
["Granite","Mount Antero intrusion","84-300",-1.06223247931e+002,3.86491629325e+001,"Gunnison","Garfield","FT","Zircon",28.200000,"3","28.2","Shannon (1988)",null]
["Granite","Mount Antero intrusion","84-300",-1.06223097968e+002,3.86492837177e+001,"Gunnison","Garfield","FT","Apatite",14.800000,"2","14.8","Shannon (1988)",null]
["Granite","Mount Antero granite","84-300",-1.06222945977e+002,3.86492853068e+001,"Gunnison","Garfield","FT","Monazite",6.600000,"0.8","6.6","Shannon (1988)",null]
["Rhyolite","Basal vitrophyre of the Wall Mountain Tuff","85-127",-1.05983324145e+002,3.88418324745e+001,"Pikes Peak","Castle Rock Gulch","FT","Zircon",37.300000,"3.7","37.3","Shannon (1988)",null]
["Rhyolite","Wall Mountain Tuff","85-127a",-1.05983322833e+002,3.88417371139e+001,"Pikes Peak","Castle Rock Gulch","FT","Sphene",42.000000,"6.1","42","Shannon (1988)","Devitrified welded flow."]
["Rhyolite","Wall Mountain Tuff","85-127a",-1.05983446075e+002,3.88418314474e+001,"Pikes Peak","Castle Rock Gulch","FT","Allanite",34.700000,"2.3","34.7","Shannon (1988)",null]
["Rhyolite","Wall Mountain Tuff","85-127a",-1.05983324145e+002,3.88418324745e+001,"Pikes Peak","Castle Rock Gulch","FT","Zircon",36.500000,"3.4","36.5","Shannon (1988)","Devitrified welded flow."]
["Rhyodacite","Tuff of Triad Ridge","85-128",-1.05986111111e+002,3.88216666663e+001,"Pikes Peak","Castle Rock Gulch","FT","Zircon",34.100000,"3.7","34.1","Shannon (1988)","Previously thought to be Outflow of Badger Creek Tuff."]
["Rhyodacite","Tuff of Triad Ridge","85-128",-1.05986111111e+002,3.88216666663e+001,"Pikes Peak","Castle Rock Gulch","FT","Apatite",33.600000,"5.1","33.6","Shannon (1988)",null]
["Rhyodacite","Mount Aetna ring dike","85-42c",-1.06258441452e+002,3.87815752743e+001,"Gunnison","Mount Yale","FT","Sphene",35.900000,"3.6","35.9","Shannon (1988)",null]
["Rhyodacite","Mount Aetna ring dike","85-42c",-1.06258441452e+002,3.87815752743e+001,"Gunnison","Mount Yale","FT","Allanite",33.800000,"3.4","33.8","Shannon (1988)",null]
["Rhyodacite","Mount Aetna ring dike","85-42c",-1.06258441452e+002,3.87815752743e+001,"Gunnison","Mount Yale","FT","Zircon",34.600000,"3.3","34.6","Shannon (1988)",null]
["Rhyodacite","Mount Aetna ring dike","85-42c",-1.06258441452e+002,3.87815752743e+001,"Gunnison","Mount Yale","FT","Apatite",23.800000,"2.8","23.8","Shannon (1988)",null]
["Rhyodacite","Intrusive tuff dike associated with Mount Aetna cauldron","85-53",-1.06375277778e+002,3.87255555554e+001,"Gunnison","Tincup","FT","Sphene",34.000000,"3.3","34","Shannon (1988)",null]
["Rhyodacite","Intrusive tuff dike associated with Mount Aetna cauldron","85-53",-1.06375277778e+002,3.87255555554e+001,"Gunnison","Tincup","FT","Allanite",37.200000,"2.9","37.2","Shannon (1988)",null]
["Rhyodacite","Dike associated with Mount Aetna cauldron","85-53",-1.06375277778e+002,3.87255555554e+001,"Gunnison","Tincup","FT","Zircon",34.200000,"3.4","34.2","Shannon (1988)","Intrusive tuff dike."]
["Rhyodacite","Intrusive tuff dike associated with Mount Aetna cauldron","85-53",-1.06375277778e+002,3.87255555554e+001,"Gunnison","Tincup","FT","Apatite",37.000000,"2.4","37","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","85-70",-1.06397222222e+002,3.85875000002e+001,"Gunnison","Garfield","FT","Sphene",39.400000,"3.2","39.4","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","85-70",-1.06397222222e+002,3.85875000002e+001,"Gunnison","Garfield","FT","Allanite",35.900000,"4.1","35.9","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","85-70",-1.06397222222e+002,3.85875000002e+001,"Gunnison","Garfield","FT","Zircon",34.200000,"2.9","34.2","Shannon (1988)",null]
["Rhyolite","Browns Creek plug","BCP7",-1.06274722222e+002,3.86400000002e+001,"Gunnison","Saint Elmo","FT","Zircon",22.100000,"1.1","22.1","Shannon (1988)","Location approximate.  Interpreted by Shannon (1988) to be an uplift-cooling age related to Rio Grande rift tectonism."]
["Granodiorite","Mount Princeton pluton","TMPM-CCQ",-1.06240243077e+002,3.87148414968e+001,"Gunnison","Mount Antero","FT","Sphene",27.600000,"2.5","27.6","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","TMPM-CCQ",-1.06240243077e+002,3.87148414968e+001,"Gunnison","Mount Antero","FT","Allanite",30.300000,"3","30.3","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","TMPM-CCQ",-1.06240243077e+002,3.87148414968e+001,"Gunnison","Mount Antero","FT","Zircon",29.400000,"2.8","29.4","Shannon (1988)",null]
["Granodiorite","Mount Princeton pluton","TMPM-CCQ",-1.06240243077e+002,3.87148414968e+001,"Gunnison","Mount Antero","FT","Apatite",21.000000,"3.6","21","Shannon (1988)",null]
["Amphibolite","Big Thompson Canyon","BTCBT12D-a",-1.05281137766e+002,4.04213642821e+001,"Estes Park","Drake","40Ar/39Ar","Hornblende",1523.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age. High Magesium hornblende.  High titanium biotite."]
["Amphibolite","Big Thompson Canyon","BTCBT12D-a",-1.05281137766e+002,4.04213642821e+001,"Estes Park","Drake","40Ar/39Ar","Biotite",1370.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age. High magnesium hornblende.  High titanium biotite."]
["Micaceous schist","Carter Lake","BTCR30409-1a",-1.05242200000e+002,4.03719000003e+001,"Estes Park","Carter Lake Reservoir","40Ar/39Ar","Muscovite",1395.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age."]
["Quartzo-feldspathic schist","Carter Lake","BTCR30409-1b",-1.05242200000e+002,4.03719000003e+001,"Estes Park","Carter Lake Reservoir","40Ar/39Ar","Biotite",1341.000000,"2",null,"Shaw and others (1999)","Total gas age.  Concave upward spectrum.  Meaningless age."]
["Micaeous schist","Big Thompson Canyon","BTCR30409-2c",-1.05224700000e+002,4.04219000002e+001,"Estes Park","Masonville","40Ar/39Ar","Phengite",1389.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age."]
["Trondhjemite","Palisade Mountain pluton","BTCR30409-3a",-1.05228600000e+002,4.04353000000e+001,"Estes Park","Masonville","40Ar/39Ar","Biotite",1401.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age."]
["Trondhjemite","Palisade Mountain pluton","BTCR30409-3a",-1.05228600000e+002,4.04353000000e+001,"Estes Park","Masonville","40Ar/39Ar","Microcline",1179.000000,"1",null,"Shaw and others (1999)","Total gas age.  Continuous loss pattern.  Meaningless age."]
["Amphibolite","Big Thompson Canyon","BTCR30409-3b",-1.05228600000e+002,4.04353000000e+001,"Estes Park","Masonville","40Ar/39Ar","Actinolite",1494.000000,"2",null,"Shaw and others (1999)","Total gas age.  Erratic spectrum with continuous loss.. Meaningless age.  Actinolite cores"]
["Amphibolite","Big Thompson Canyon","BTCR30409-3c",-1.05228600000e+002,4.04353000000e+001,"Estes Park","Masonville","40Ar/39Ar","Actinolite",1413.000000,"2",null,"Shaw and others (1999)","Total gas age.  Maximum age 1500 Ma. 5-10% actinolite cores"]
["Amphibolite","Big Thompson Canyon","BTCR30409-4a",-1.05243600000e+002,4.04182999997e+001,"Estes Park","Masonville","40Ar/39Ar","Hornblende",1479.000000,"2",null,"Shaw and others (1999)","Total gas age.  Continuous loss pattern. Maximum age 1525 Ma. High potassium hornblende."]
["Micaceous schist","Big Thompson Canyon","BTCR30409-4b",-1.05243600000e+002,4.04182999997e+001,"Estes Park","Masonville","40Ar/39Ar","Biotite",1385.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age. Metamict biotite."]
["Micaceous schist","Big Thompson Canyon","BTCR30409-4b",-1.05243600000e+002,4.04182999997e+001,"Estes Park","Masonville","40Ar/39Ar","Muscovite",1382.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age. Metamict biotite."]
["Quartz-feldspar schist","Big Thompson Canyon","BTCR30409-6a",-1.05358100000e+002,4.04194000000e+001,"Estes Park","Drake","40Ar/39Ar","Muscovite",1349.000000,"1",null,"Shaw and others (1999)","Preferred/Plateau age. High iron biotite."]
["Quartz-feldspar schist","Big Thompson Canyon","BTCR30409-6a",-1.05358100000e+002,4.04194000000e+001,"Estes Park","Drake","40Ar/39Ar","Biotite",1282.000000,"1",null,"Shaw and others (1999)","Preferred/Plateau age. High iron biotite."]
["Micaceous schist","Big Thompson Canyon","BTCR30409-6b",-1.05360300000e+002,4.04194000000e+001,"Estes Park","Drake","40Ar/39Ar","Muscovite",1368.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age."]
["Micaceous schist","Big Thompson Canyon","BTCR30409-6b",-1.05360300000e+002,4.04194000000e+001,"Estes Park","Drake","40Ar/39Ar","Biotite",1343.000000,"1",null,"Shaw and others (1999)","Preferred/Plateau age."]
["Micaceous schist","Big Thompson Canyon","BTCR30409-5a",-1.05311400000e+002,4.04302999998e+001,"Estes Park","Drake","40Ar/39Ar","Muscovite",1386.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age. Low iron biotite."]
["Micaceous schist","Big Thompson Canyon","BTCR30409-5a",-1.05311400000e+002,4.04302999998e+001,"Estes Park","Drake","40Ar/39Ar","Biotite",1370.000000,"2",null,"Shaw and others (1999)","Preferred/Plateau age. Low iron biotite."]
["Amphibolite gneiss","Texas Creek area","7520-4",-1.05531260419e+002,3.84314351042e+001,"Canon City","Echo","40Ar/39Ar","Hornblende",1392.000000,"3","1392","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-2",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1355.000000,"5","1355","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-3a",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1342.000000,"6","1342","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-4a",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1357.000000,"8","1357","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-4b",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1369.000000,"7","1369","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-4c",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1365.000000,"7","1365","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-5b",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Biotite",1234.000000,"4","1234","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-6",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1344.000000,"7","1344","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-6",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Biotite",1402.000000,"4","1402","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-7b",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1356.000000,"10","1356","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-7c",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1338.000000,"4","1338","Siddoway and others (2000)","Weighted mean plateau age.  Location approximate."]
["Amphibolite gneiss","Hardscabble Creek area","KEK-7c",-1.05116388889e+002,3.81313888888e+001,"Canon City","Wetmore","40Ar/39Ar","Biotite",1282.000000,"4","1282","Siddoway and others (2000)","Total gas date.  Location approximate."]
["Granodiorite porphyry","Lincoln Porphyry","25T56",-1.06114374688e+002,3.93503060696e+001,"Leadville","Alma","Rb-Sr","Whole-rock",67.000000,"Not report","67","Simmons and Hedge (1978)",null]
["Porphyry","Evans Gulch Porphyry","31T55",-1.06250000000e+002,3.92500000000e+001,"Leadville","Leadville North","Rb-Sr","Whole-rock",64.000000,"Not report","64","Simmons and Hedge (1978)",null]
["Quartz monzonite","Lyons quarry sill","75C88",-1.05296100000e+002,4.02014000000e+001,"Estes Park","Lyons","Rb-Sr","Whole-rock",64.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Hornblende-pyroxene monzonite","Empire stock","75CS67",-1.05719551197e+002,3.97632143048e+001,"Denver West","Empire","Rb-Sr","Whole-rock",65.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Caribou stock","75CS69",-1.05579200000e+002,3.99828000002e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Pyroxenite","Caribou stock","75CS70a",-1.05579400000e+002,3.99824999998e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Hornblendite","Caribou stock","75CS72a",-1.05586100000e+002,3.99782999996e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz syenite","East of Burnt Mountain","75CS73",-1.05448025124e+002,4.00758710375e+001,"Estes Park","Gold Hill","Rb-Sr","Whole-rock",51.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Leucocratic monzonite","Bostonite, near Lawson","75CS76",-1.05633300000e+002,3.97602999996e+001,"Denver West","Empire","Rb-Sr","Whole-rock",65.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz syenite","Apex stock","75CS77a",-1.05550000000e+002,3.98749999997e+001,"Denver West","Central City/ Nederland","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz-bearing monzonite","Eldora stock","75CS78",-1.05590112557e+002,3.99480394411e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",59.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Hornblende Latite","Dike south of Nederland","75-CS79",-1.05516700000e+002,3.99558000002e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",58.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz syenite","Stock on Fall River","75CS80",-1.05576627510e+002,3.97819141739e+001,"Denver West","Central City","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz monzonite","Swan Mountain sill","75CS86",-1.06038888889e+002,3.95911111110e+001,"Vail","Breckenridge","Rb-Sr","Whole-rock",44.000000,"Not report","44","Simmons and Hedge (1978)",null]
["Granodiorite","Empire stock","75CS88",-1.05669700000e+002,3.97602999996e+001,"Denver West","Empire","Rb-Sr","Whole-rock",65.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Leucocratic monzonite","Audubon-Albion stock","76CS100",-1.05591100000e+002,4.00767000002e+001,"Estes Park","Ward","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Bostonite","Wood Dike","76CS101",-1.05592851954e+002,3.98408095451e+001,"Denver West","Central City","Rb-Sr","Whole-rock",58.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz-bearing monzonite","Eldora stock","76CS102",-1.05586015910e+002,3.99493064482e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",59.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz-bearing monzonite","Eldora stock","76CS103",-1.05613962419e+002,3.99506170302e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",59.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Table Mountain lava flow","76CS89",-1.05224700000e+002,3.97796999999e+001,"Denver West","Golden","Rb-Sr","Whole-rock",64.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Table Mountain basalt lava flow","76CS90",-1.05223100000e+002,3.97780999999e+001,"Denver West","Golden","Rb-Sr","Whole-rock",64.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Table Mountain basalt lava flow","76CS91",-1.05222200000e+002,3.97769000003e+001,"Denver West","Golden","Rb-Sr","Whole-rock",64.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Pyroxenite","Empire stock","76CS92",-1.05713900000e+002,3.97600000001e+001,"Denver West","Empire","Rb-Sr","Whole-rock",65.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Ralston dike","76CS93",-1.05242200000e+002,3.98275000000e+001,"Denver West","Golden","Rb-Sr","Whole-rock",64.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Valmont dike","76CS94",-1.05190300000e+002,4.00347000004e+001,"Estes Park","Niwot","Rb-Sr","Whole-rock",64.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Audubon-Albion stock","76CS96",-1.05614700000e+002,4.00707999998e+001,"Estes Park","Ward","Rb-Sr","Whole-rock",66.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Porphyritic monzonite","Audubon-Albion stock","76CS97",-1.05613100000e+002,4.00530999996e+001,"Estes Park","Ward","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz-bearing monzonite","Audubon-Albion stock","76CS98",-1.05596700000e+002,4.00896999996e+001,"Estes Park","Ward","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz-bearing monzonite","Audubon-Albion stock","76CS99",-1.05602500000e+002,4.00793999997e+001,"Estes Park","Ward","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Porphyry","Johnson Gulch Porphyry","90T53",-1.06221745771e+002,3.92395367686e+001,"Leadville","Climax","Rb-Sr","Whole-rock",67.000000,"Not report","67","Simmons and Hedge (1978)",null]
["Leucocratic monzonite","Boulder Creek pluton","BC-3",-1.05406953535e+002,4.00580869291e+001,"Estes Park","Gold Hill","Rb-Sr","Whole-rock",51.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz-bearing monzonite","Caribou stock","HMN-1",-1.05590600000e+002,3.99964000003e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Hornblende latite","Dike north of Eldora","HMN-10",-1.05561100000e+002,3.99521999998e+001,"Denver West","Nederalnd","Rb-Sr","Whole-rock",58.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz-bearing monzonite","Eldora stock","Hmn-13",-1.05585300000e+002,3.99500000000e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",59.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Mafic monzonite","Caribou stock","HMN-2",-1.05602500000e+002,3.99875000001e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",58.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Hornblendite","Caribou stock","HMN-3",-1.05602500000e+002,3.99878000004e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",58.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Biotite latite","Dike south of Nederland","HMN-8",-1.05506100000e+002,3.99577999998e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",58.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Quartz syenite","Apex stock","HMN-9",-1.05548100000e+002,3.98957999999e+001,"Denver West","Nederland","Rb-Sr","Whole-rock",60.000000,"Not report",null,"Simmons and Hedge (1978)",null]
["Kimberlite","Estes Park diatreme","Estes Park diatreme",-1.05520016943e+002,4.03307656024e+001,"Estes Park","Longs Peak","Rb-Sr","Phlogopite",386.000000,"9",null,"Smith (1979)","Isochron."]
["Volcanic ash","Browns Park Formation","2",-1.06916111111e+002,4.08897222224e+001,"Walden","Elkhorn Mountain","FT","Zircon",9.000000,"2.1","9.0 ± 2.1","Snyder (1980a)","Browns Park Formation."]
["Volcanic ash","Browns Park Formation","16",-1.07042777778e+002,4.07575000000e+001,"Craig","Meaden Peak","FT","Zircon",9.200000,"1.7","9.2 ± 1.7","Snyder (1980a)","Browns Park Formation."]
["Volcanic ash","Browns Park Formation","16",-1.07042777778e+002,4.07575000000e+001,"Craig","Meaden Peak","FT","Zircon",11.500000,"1.8","11.5 ± 1.8","Snyder (1980a)","Browns Park Formation."]
["Volcanic ash","Browns Park Formation","16",-1.07042777778e+002,4.07575000000e+001,"Craig","Meaden Peak","FT","Zircon",15.400000,"2.6","15.8 ± 2.6","Snyder (1980a)","Browns Park Formation."]
["Trachyandesite","Flow of North Park","4",-1.06642222222e+002,4.04252777782e+001,"Steamboat Springs","Mount Werner","FT","Zircon",17.000000,"1.5","17.0 ± 1.5","Snyder (1980b)","Analytical data not reported."]
["Tuff","Browns Park Formation","7A",-1.06733055555e+002,4.03738888887e+001,"Steamboat Springs","Mount Werner","FT","Zircon",20.200000,"1.9","20.2 ± 1.9","Snyder (1980b)","Analytical data not reported."]
["Quartz monzonite","Mount Ethel pluton","520",-1.06780400000e+002,4.06485000000e+001,"Walden","Rocky Peak","Rb-Sr","Whole-rock",1439.000000,"50","1470 ± 50","Snyder and Hedge (1978)","Isochron based on 7 samples.  (Sample 1 of 7)."]
["Granite","Mount Ethel pluton","521",-1.06748200000e+002,4.06130999996e+001,"Walden","Floyd Peak","Rb-Sr","Whole-rock",1439.000000,"50","1470 ± 50","Snyder and Hedge (1978)","Isochron based on 7 samples.  (Sample 2 of 7)."]
["Granite","Mount Ethel pluton","522",-1.06732200000e+002,4.05231000003e+001,"Walden","Mount Ethel","Rb-Sr","Whole-rock",1439.000000,"50","1470 ± 50","Snyder and Hedge (1978)","Isochron based on 7 samples.  (Sample 3 of 7)."]
["Quartz monzonite","Mount Ethel pluton","523",-1.06687800000e+002,4.05042999998e+001,"Walden","Mount Ethel","Rb-Sr","Whole-rock",1439.000000,"50","1470 ± 50","Snyder and Hedge (1978)","Isochron based on 7 samples.  (Sample 4 of 7)."]
["Quartz monzonite","Mount Ethel pluton","525",-1.06769500000e+002,4.05742999998e+001,"Walden","Floyd Peak","Rb-Sr","Whole-rock",1439.000000,"50","1470 ± 50","Snyder and Hedge (1978)","Isochron based on 7 samples.  (Sample 5 of 7)."]
["Quartz monzonite","Mount Ethel pluton","526",-1.06733200000e+002,4.06411999999e+001,"Walden","Buffalo Pass","Rb-Sr","Whole-rock",1439.000000,"50","1470 ± 50","Snyder and Hedge (1978)","Isochron based on 7 samples.  (Sample 6 of 7)."]
["Quartz monzonite","Mount Ethel pluton","527",-1.06750900000e+002,4.06292999999e+001,"Walden","Rocky Peak","Rb-Sr","Whole-rock",1439.000000,"50","1470 ± 50","Snyder and Hedge (1978)","Isochron based on 7 samples.  (Sample 7 of 7)."]
["Quartz monzonite","Buffalo Pass pluton","544",-1.06701400000e+002,4.06550000002e+001,"Walden","Buffalo Pass","Rb-Sr","Whole-rock",1762.000000,"100","1800 ± 100","Snyder and Hedge (1978)","Isochron based on 5 samples.  (Sample 1 of 5)."]
["Quartz monzonite gneiss","Buffalo Pass pluton","550",-1.06654200000e+002,4.06099999997e+001,"Walden","Buffalo Pass","Rb-Sr","Whole-rock",1762.000000,"100","1800 ± 100","Snyder and Hedge (1978)","Isochron based on 5 samples.  (Sample 2 of 5)."]
["Quartz monzonite gneiss","Buffalo Pass pluton","553",-1.06670000000e+002,4.04800000002e+001,"Walden","Buffalo Pass","Rb-Sr","Whole-rock",1762.000000,"100","1800 ± 100","Snyder and Hedge (1978)","Isochron based on 5 samples.  (Sample 3 of 5)."]
["Quartz monzonite","Buffalo Pass pluton","554",-1.06709500000e+002,4.05314999999e+001,"Walden","Buffalo Pass","Rb-Sr","Whole-rock",1762.000000,"100","1800 ± 100","Snyder and Hedge (1978)","Isochron based on 5 samples.  (Sample 4 of 5)."]
["Quartz monzonite","Buffalo Pass pluton","555",-1.06716100000e+002,4.05249999998e+001,"Walden","Buffalo Pass","Rb-Sr","Whole-rock",1762.000000,"100","1800 ± 100","Snyder and Hedge (1978)","Isochron based on 5 samples.  (Sample 5 of 5)."]
["Feldspathic-biotite gneiss","Gneiss intruded by Buffalo Pass pluton","593",-1.06606500000e+002,4.07495000000e+001,"Walden","Teal Lake","Rb-Sr","Whole-rock",1654.000000,"100","1690 ± 100","Snyder and Hedge (1978)","Isochron based on 3 samples.  (Sample 1 of 3)."]
["Feldspathic-biotite gneiss","Gneiss intruded by Buffalo Pass pluton","616",-1.06662500000e+002,4.05332000001e+001,"Walden","Buffalo Pass","Rb-Sr","Whole-rock",1654.000000,"100","1690 ± 100","Snyder and Hedge (1978)","Isochron based on 3 samples.  (Sample 2 of 3)."]
["Feldspathic-biotite gneiss","Gneiss intruded by Buffalo Pass pluton","631",-1.06605387333e+002,4.07498734659e+001,"Walden","Pitchpine Mountain","Rb-Sr","Whole-rock",1654.000000,"100","1690 ± 100","Snyder and Hedge (1978)","Isochron based on 3 samples.  (Sample 3 of 3)."]
["Syenite","McClure Mountain alkaline complex","MMhb-1",-1.05483333333e+002,3.83499999997e+001,"Canon City","Iron Mountain","40Ar/39Ar","Hornblende",523.200000,"0.9","523.2","Spell and McDougall (2003)","Location approximate.  Date calculated using GA-1550 as the primary standard."]
["Mafic hornblende-bearing biotite quartz monzonite","Boulder Creek granodiorite","58GP1",-1.05392500000e+002,4.00699999998e+001,"Estes Park","Gold Hill","U-Pb","Zircon",1725.000000,"66",null,"Stern and others (1971)","Concordia based on 6 samples."]
["Hornblende-bearing leuco-quartz monzonite gneiss","Boulder Creek granodiorite","63GP15",-1.05366100000e+002,4.00886000002e+001,"Estes Park","Boulder","U-Pb","Zircon",1725.000000,"66",null,"Stern and others (1971)","Concordia based on 6 samples."]
["Hornblende-bearing biotite quartz diorite","Boulder Creek granodiorite","63GP40",-1.05393900000e+002,4.00392000001e+001,"Estes Park","Gold Hill","U-Pb","Zircon",1725.000000,"66",null,"Stern and others (1971)","Concordia based on 6 samples."]
["Muscovite-biotite granite","Dike intruding quartz diorite of Boulder Creek batholith","63GP-41",-1.05393900000e+002,4.00699999998e+001,"Estes Park","Gold Hill","U-Pb","Zircon",1415.000000,"66",null,"Stern and others (1971)",null]
["Biotite granodiorite gneiss","Boulder Creek pluton","63GP99",-1.05503300000e+002,4.00003000002e+001,"Estes Park","Ward","U-Pb","Zircon",1725.000000,"Not report",null,"Stern and others (1971)","Concordia based on 6 samples."]
["Leuco-quartz monzonite gneiss","Boulder Creek pluton","GP509",-1.05344200000e+002,3.99363999999e+001,"Denver West","Eldorado Springs","U-Pb","Zircon",1725.000000,"Not report",null,"Stern and others (1971)","One of 6 samples forming chord with upper intercept at 1725 Ma."]
["Amphibolite inclusion in Boulder Creek","Boulder Creek pluton","GP721",-1.05365172409e+002,3.99498566067e+001,"Denver West","Eldorado Springs","U-Pb","Zircon",1725.000000,"Not report",null,"Stern and others (1971)","One of 6 samples forming chord with upper intercept at 1725 Ma."]
["Tuff","Fish Canyon Tuff","BC5793",-1.07271388889e+002,3.84502777776e+001,"Montrose","Sapinero","K/Ar","Biotite",27.500000,"2.7","26.8","Steven and others (1967)","Location approximate."]
["Quartz latite","Fisher Quartz Latite, Fisher Mountain flow","Ds10",-1.06943055555e+002,3.76847222226e+001,"Del Norte","Spar City","K/Ar","Sanidine",28.000000,"0.8","27.3","Steven and others (1967)",null]
["Quartz latite","Fisher Quartz Latite, Fisher Mountain flow","Ds10",-1.06943055555e+002,3.76847222226e+001,"Del Norte","Spar City","K/Ar","Biotite",27.000000,"0.8","26.3","Steven and others (1967)",null]
["Quartz latite","Fisher Quartz Latite, Fisher Mountain flow","Ds10",-1.06943055555e+002,3.76847222226e+001,"Del Norte","Spar City","K/Ar","Hornblende",26.600000,"1.8","25.9","Steven and others (1967)",null]
["Quartz latite","Fisher Quartz Latite, Fisher Mountain flow","Ds10",-1.06943055555e+002,3.76847222226e+001,"Del Norte","Spar City","K/Ar","Plagioclase",26.600000,"1.8","25.9","Steven and others (1967)",null]
["Unnamed","Fish Canyon Tuff","Ds28",-1.06659722222e+002,3.78105555552e+001,"Del Norte","Pool Table Mountain","K/Ar","Biotite",28.400000,"0.8","27.7","Steven and others (1967)",null]
["Unnamed","Fish Canyon Tuff","Ds28",-1.06659722222e+002,3.78105555552e+001,"Del Norte","Pool Table Mountain","K/Ar","Sanidine",28.500000,"0.8","27.8","Steven and others (1967)",null]
["Unnamed","Fish Canyon Tuff","Ds28",-1.06659722222e+002,3.78105555552e+001,"Del Norte","Pool Table Mountain","K/Ar","Hornblende",27.200000,"1.9","26.5","Steven and others (1967)",null]
["Unnamed","Fish Canyon Tuff","Ds28",-1.06659722222e+002,3.78105555552e+001,"Del Norte","Pool Table Mountain","K/Ar","Plagioclase",28.100000,"1.9","27.4","Steven and others (1967)",null]
["Quartz latite","Summitville area","Ds29c",-1.06599444444e+002,3.74125000002e+001,"Antonito","Summitville","K/Ar","Biotite",20.800000,"0.8","20.3","Steven and others (1967)","Location from Marvin and others (1974)."]
["Quartz latite","Summitville area","Ds29c",-1.06599444444e+002,3.74125000002e+001,"Antonito","Summitville","K/Ar","Sanidine",19.700000,"0.8","19.2","Steven and others (1967)","Location from Marvin and others (1974)."]
["Quartz latite","Summitville area","Ds29c",-1.06599444444e+002,3.74125000002e+001,"Antonito","Summitville","K/Ar","Hornblende",20.800000,"0.8","20.3","Steven and others (1967)","Location from Marvin and others (1974)."]
["Quartz latite","Summitville area","Ds29c",-1.06599444444e+002,3.74125000002e+001,"Antonito","Summitville","K/Ar","Plagioclase",21.400000,"0.8","20.9","Steven and others (1967)","Location from Marvin and others (1974)."]
["Unnamed","La Garita Quartz Latite","S292",-1.06837500000e+002,3.79127777779e+001,"Del Norte","Halfmoon Pass","K/Ar","Sanidine",28.600000,"0.8","27.9","Steven and others (1967)",null]
["Quartz latite","La Garita Quartz Latite","S318",-1.06888333333e+002,3.79516666667e+001,"Del Norte","San Luis Peak","K/Ar","Sanidine",28.400000,"0.8","27.7","Steven and others (1967)",null]
["Quartz latite","Fisher Quartz Latite, Fisher Mountain flow","S332",-1.06950000000e+002,3.76786111109e+001,"Del Norte","Spar City","K/Ar","Sanidine",27.200000,"1","26.5","Steven and others (1967)",null]
["Quartz latite","Fisher Quartz Latite, Copper Mountain flow","S333",-1.06904166667e+002,3.76999999997e+001,"Del Norte","Spar City","K/Ar","Sanidine",27.500000,"1.4","26.8","Steven and others (1967)",null]
["Biotite gabbro","Spanish Peaks area","855-432",-1.05030837383e+002,3.72374374596e+001,"Alamosa","Stonewall","K/Ar","Biotite",24.000000,"1","23.4","Stormer (1972)","Location approximate."]
["Syenodiorite lamprophyre","Spanish Peaks area","CSP-17",-1.05058243262e+002,3.73483466888e+001,"Alamosa","Cucharas Pass","K/Ar","Plagioclase",26.400000,"0.8","25.7","Stormer (1972)",null]
["Rhyolite tuff breccia","Possibly derived from Red Mountain center","No. 2, Table 1",-1.05777541708e+002,3.99178324983e+001,"Denver West","Fraser","K/Ar","Sanidine",29.800000,"3",null,"Taylor and others (1968)",null]
["Rhyolite","Red Mountain plug","No. 3, Table 1",-1.05841700000e+002,3.97666999996e+001,"Denver West","Berthoud Pass","K/Ar","Sanidine",27.700000,"3",null,"Taylor and others (1968)",null]
["Rhyolite","Rabbit Ears Volcanics","1",-1.06208055556e+002,4.01208333331e+001,"Steamboat Springs","Parshall","K/Ar","Sanidine",33.900000,"3","33","Taylor and others (1968); Izett (1966)","Location approximate; good to 1/4 section."]
["Porphyry","Sacramento porphyry","CSU-1",-1.06208333334e+002,3.92624999998e+001,"Leadville","Climax","FT","Zircon",43.900000,"4.3","43.9","Thompson and Arehart (1990)",null]
["Porphyry","Johnson Gulch Porphyry","CSU-10",-1.06227670528e+002,3.92360853236e+001,"Leadville","Mount Sherman","FT","Zircon",31.600000,"5.2","31.6","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-11",-1.06227668866e+002,3.92359899766e+001,"Leadville","Mount Sherman","FT","Zircon",28.800000,"4.2","28.8","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-3",-1.06225000000e+002,3.92249999997e+001,"Leadville","Mount Sherman","FT","Zircon",30.300000,"5","30.3","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-4",-1.06225000000e+002,3.92249999997e+001,"Leadville","Mount Sherman","FT","Zircon",32.000000,"5","32","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-5",-1.06225000000e+002,3.92249999997e+001,"Leadville","Mount Sherman","FT","Zircon",34.000000,"5.4","34","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-6",-1.06225000000e+002,3.92249999997e+001,"Leadville","Mount Sherman","FT","Zircon",33.800000,"6.4","33.8","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-7",-1.06225000000e+002,3.92249999997e+001,"Leadville","Mount Sherman","FT","Zircon",32.000000,"5.4","32","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-8",-1.06225000000e+002,3.92249999997e+001,"Leadville","Mount Sherman","FT","Zircon",38.300000,"6","38.3","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","CSU-9",-1.06225000000e+002,3.92249999997e+001,"Leadville","Mount Sherman","FT","Zircon",37.700000,"5.6","37.7","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","FT-4",-1.06226931387e+002,3.92374306923e+001,"Leadville","Mount Sherman","FT","Apatite",24.600000,"12","24.6","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","FT-4",-1.06227052327e+002,3.92373340538e+001,"Leadville","Mount Sherman","FT","Zircon",35.500000,"4.5","35.5","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Porphyry","Johnson Gulch Porphyry","FT-6",-1.06227052327e+002,3.92373340538e+001,"Leadville","Mount Sherman","FT","Zircon",34.000000,"3.9","34","Thompson and Arehart (1990)","Location from Wallace (1993, 1995)."]
["Granodiorite porphyry","Lincoln Porphyry","T-2",-1.06273200000e+002,3.93482999997e+001,"Leadville","Leadville North","FT","Zircon",38.200000,"3.5","38.2","Thompson and Arehart (1990)",null]
["Basalt","Block of Servilleta Formation in landslide debris at San Pedro Me","77LRG107",-1.05500833333e+002,3.69991666664e+001,"Alamosa","Costilla","K/Ar","Whole-rock",4.300000,"0.8","4.3","Thompson and Machette (1989)","Block of Servilleta Formation in landslide debris at San Pedro Mesa."]
["Quartz monzonite","Stock of South Piñon Hills","KA 71-52",-1.05797500000e+002,3.70730555552e+001,"Alamosa","Kiowa Hill","K/Ar","Biotite",29.200000,"0.6","29.2","Thompson and Machette (1989)",null]
["Quartz monzonite","Stock of South Piñon Hills","KA 71-52",-1.05797500000e+002,3.70730555552e+001,"Alamosa","Kiowa Hill","K/Ar","Biotite",28.900000,"0.6","28.9","Thompson and Machette (1989)",null]
["Dacite","Stock in Fairy Hills","SP-11-2",-1.05740000000e+002,3.72022222221e+001,"Alamosa","Mesita Reservoir","K/Ar","Biotite",29.100000,"1.8","29.1","Thompson and Machette (1989)",null]
["Dacite","Stock in Fairy Hills","SP-11-2",-1.05740000000e+002,3.72022222221e+001,"Alamosa","Mesita Reservoir","FT","Sphene",30.900000,"2.4","30.9","Thompson and Machette (1989)",null]
["Dacite","Stock in Fairy Hills","SP-11-2",-1.05740000000e+002,3.72022222221e+001,"Alamosa","Mesita Reservoir","FT","Zircon",28.400000,"1.5","28.4","Thompson and Machette (1989)",null]
["Dacite","Dike in Fairy Hills","SP-11-8",-1.05743565050e+002,3.72078886047e+001,"Alamosa","Mesita Reservoir","K/Ar","Hornblende",28.900000,"1.5","28.9","Thompson and Machette (1989)",null]
["Dacite","Dike in Fairy Hills","SP-11-8",-1.05743714123e+002,3.72078876694e+001,"Alamosa","Mesita Reservoir","K/Ar","Biotite",26.000000,"2.7","26","Thompson and Machette (1989)",null]
["Dacite","Dike in Fairy Hills","SP-11-8",-1.05743865538e+002,3.72081252173e+001,"Alamosa","Mesita Reservoir","FT","Zircon",25.600000,"1.5","25.6","Thompson and Machette (1989)",null]
["Dacite","Dike in Fairy Hills","SP-11-8",-1.05743716463e+002,3.72081261535e+001,"Alamosa","Mesita Reservoir","FT","Sphene",25.300000,"3.2","25.3","Thompson and Machette (1989)",null]
["Quartz-alunite replacement vein","Fairy Hills","SP-231",-1.05757500000e+002,3.71844444441e+001,"Alamosa","Manassa NE","K/Ar","Alunite",25.100000,"1","25.1","Thompson and Machette (1989)",null]
["Basalt","Flow at South Piñon Hills","T84089",-1.05817777778e+002,3.70374999999e+001,"Alamosa","Kiowa Hill","K/Ar","Whole-rock",25.700000,"1.8","25.7","Thompson and Machette (1989)",null]
["Basalt","Flow at Flat Top","T84098",-1.05797777778e+002,3.71905555558e+001,"Alamosa","Manassa NE","K/Ar","Whole-rock",26.400000,"1.2","26.4","Thompson and Machette (1989)",null]
["Andesite","Flow at Flat Top","T84150",-1.05816944445e+002,3.72052777776e+001,"Alamosa","Manassa NE","K/Ar","Whole-rock",26.100000,"1.2","26.1","Thompson and Machette (1989)",null]
["Basalt","Flow at Piñon Hills","T84163",-1.05823055556e+002,3.71399999997e+001,"Alamosa","Manassa NE","K/Ar","Whole-rock",26.000000,"1.1","26","Thompson and Machette (1989)",null]
["Quartz monzonite","Mount Aetna stock","7435",-1.06326613214e+002,3.85734893706e+001,"Gunnison","Garfield","K/Ar","Hornblende",37.200000,"1.7","37.2","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Aetna stock","7435",-1.06326765038e+002,3.85734876493e+001,"Gunnison","Garfield","K/Ar","Biotite",36.000000,"1.1","36","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Aetna stock","7435",-1.06326919055e+002,3.85736051205e+001,"Gunnison","Garfield","40Ar/39Ar","Hornblende",36.100000,"0.3","36.1","Toulmin and Hammarstrom (1990)","Plateau age."]
["Quartz monzonite","Mount Aetna stock","7435",-1.06327220511e+002,3.85734824845e+001,"Gunnison","Garfield","40Ar/39Ar","Biotite",34.000000,"0.3","34","Toulmin and Hammarstrom (1990)","Plateau age."]
["Quartz monzonite","Mount Princeton pluton","7438",-1.06241881997e+002,3.87145914619e+001,"Gunnison","Mount Antero","40Ar/39Ar","Hornblende",36.300000,"0.3","36.3","Toulmin and Hammarstrom (1990)","Preferred age based on high-temperature steps in Ar-release spectrum; no distinct plateau."]
["Quartz monzonite","Mount Princeton pluton","7438",-1.06241881997e+002,3.87145914619e+001,"Gunnison","Mount Antero","40Ar/39Ar","Orthoclase",29.000000,"Not report","29","Toulmin and Hammarstrom (1990)","Approximate cooling age."]
["Quartz monzonite","Mount Princeton pluton","7438",-1.06241881997e+002,3.87145914619e+001,"Gunnison","Mount Antero","K/Ar","Biotite",36.600000,"1.1","36.6","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Princeton pluton","7438",-1.06241881997e+002,3.87145914619e+001,"Gunnison","Mount Antero","K/Ar","Hornblende",34.800000,"1.7","34.8","Toulmin and Hammarstrom (1990)",null]
["Quartz diorite","Monarch Pass","7457",-1.06250055500e+002,3.85716006109e+001,"Gunnison","Maysville","K/Ar","Hornblende",115.000000,"6","115","Toulmin and Hammarstrom (1990)",null]
["Quartz diorite","Monarch Pass","7457",-1.06250055500e+002,3.85716006109e+001,"Gunnison","Maysville","K/Ar","Biotite",46.300000,"1.4","46.3","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Princeton pluton","7569",-1.06402277778e+002,3.86325277781e+001,"Gunnison","Cumberland Pass","40Ar/39Ar","Hornblende",37.100000,"0.3","37.1","Toulmin and Hammarstrom (1990)","Preferred age based on high-temperature steps in Ar-release spectrum; no distinct plateau."]
["Quartz monzonite","Mount Princeton pluton","7569",-1.06402277778e+002,3.86325277781e+001,"Gunnison","Cumberland Pass","40Ar/39Ar","Biotite",34.400000,"0.3","34.4","Toulmin and Hammarstrom (1990)","Total gas age."]
["Quartz monzonite","Mount Princeton pluton","7569",-1.06402277778e+002,3.86325277781e+001,"Gunnison","Cumberland Pass","K/Ar","Hornblende",41.100000,"1.2","41.1","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Princeton pluton","7569",-1.06402277778e+002,3.86325277781e+001,"Gunnison","Cumberland Pass","K/Ar","Biotite",34.800000,"0.8","34.8","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Princeton pluton","7570",-1.06396944445e+002,3.86282500000e+001,"Gunnison","Cumberland Pass","40Ar/39Ar","Hornblende",36.400000,"Not report","36.4","Toulmin and Hammarstrom (1990)","Total gas age."]
["Quartz monzonite","Mount Princeton pluton","7570",-1.06396944445e+002,3.86282500000e+001,"Gunnison","Cumberland Pass","40Ar/39Ar","Biotite",34.500000,"0.3","34.5","Toulmin and Hammarstrom (1990)","Total gas age."]
["Quartz monzonite","Mount Princeton pluton","7570",-1.06396944445e+002,3.86282500000e+001,"Gunnison","Cumberland Pass","40Ar/39Ar","Orthoclase",34.000000,"Not report","34","Toulmin and Hammarstrom (1990)","Approximate cooling age."]
["Quartz monzonite","Mount Princeton pluton","7570",-1.06396944445e+002,3.86282500000e+001,"Gunnison","Cumberland Pass","K/Ar","Hornblende",36.900000,"1.1","36.9","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Princeton pluton","7570",-1.06396944445e+002,3.86282500000e+001,"Gunnison","Cumberland Pass","K/Ar","Biotite",34.500000,"0.8","34.5","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Princeton pluton","7574",-1.06266775157e+002,3.88069503297e+001,"Gunnison","Mount Yale","40Ar/39Ar","Hornblende",35.400000,"0.3","35.4","Toulmin and Hammarstrom (1990)","Preferred age based on high-temperature steps in Ar-release spectrum; no distinct plateau."]
["Quartz monzonite","Mount Princeton pluton","7574",-1.06266895326e+002,3.88068536553e+001,"Gunnison","Mount Yale","40Ar/39Ar","Biotite",34.600000,"0.3","34.6","Toulmin and Hammarstrom (1990)","Plateau age."]
["Quartz monzonite","Mount Princeton pluton","7574",-1.06266651611e+002,3.88068562984e+001,"Gunnison","Mount Yale","40Ar/39Ar","Orthoclase",32.000000,"Not report","32","Toulmin and Hammarstrom (1990)","Approximate cooling age."]
["Ash-flow tuff","Sewanee Peak Volcanics","7723",-1.06321750000e+002,3.85916944445e+001,"Gunnison","Garfield","K/Ar","Biotite",33.900000,"Not report","33.9","Toulmin and Hammarstrom (1990)",null]
["Ash-flow tuff","Sewanee Peak Volcanics","7723",-1.06321750000e+002,3.85916944445e+001,"Gunnison","Garfield","40Ar/39Ar","Hornblende",35.700000,"0.3","35.7","Toulmin and Hammarstrom (1990)","Preferred age based on high-temperature steps in Ar-release spectrum; no distinct plateau."]
["Ash-flow tuff","Sewanee Peak Volcanics","7723",-1.06321750000e+002,3.85916944445e+001,"Gunnison","Garfield","40Ar/39Ar","Biotite",33.600000,"0.3","33.6","Toulmin and Hammarstrom (1990)","Total gas age."]
["Granite","Hoffman Park Granite","7788",-1.06314611111e+002,3.85778611108e+001,"Gunnison","Garfield","K/Ar","Biotite",33.200000,"0.7","33.2","Toulmin and Hammarstrom (1990)",null]
["Quartz monzonite","Mount Princeton pluton","64B76",-1.06337143275e+002,3.87663845777e+001,"Gunnison","Mount Yale","K/Ar","Biotite",34.900000,"1","34.9","Toulmin and Hammarstrom (1990)","Location not given in text; provided by P. Toulmin, 2007, written communication."]
["Quartz monzonite","Mount Princeton pluton","64B76",-1.06337143275e+002,3.87663845777e+001,"Gunnison","Mount Yale","K/Ar","Hornblende",41.100000,"0.9","41.1","Toulmin and Hammarstrom (1990)","Location not given in text; provided by P. Toulmin, 2007, written communication."]
["Granite","Cross Creek pluton",null,-1.06501388889e+002,3.95166666669e+001,"Vail","Grouse Mountain","Rb-Sr","Whole-rock",1658.000000,"Not report","1710","Tweto and Lovering (1977)","Isochron based on 6 samples.  Location from Wallace (1993, 1995)."]
["Quartz latite","Mount Champion area","MM-01",-1.06546490558e+002,3.91232101368e+001,"Leadville","Independence Pass","K/Ar","Biotite",65.400000,"2.4","65.4","Van Loenen and others (1989)","Location from Wallace (1993, 1995)."]
["Unnamed","Halfmoon Creek stock","MM-12",-1.06502685142e+002,3.91377240559e+001,"Leadville","Mount Massive","K/Ar","Biotite",44.300000,"1.6","44.3","Van Loenen and others (1989)","Location from Wallace (1993, 1995).  Intensely altered."]
["Quartz latite","West of Leadville","MM-35",-1.06493434839e+002,3.92080671814e+001,"Leadville","Mount Massive","K/Ar","Biotite",63.900000,"2.3","63.9","Van Loenen and others (1989)","Location from Wallace (1993, 1995)."]
["Unnamed","Halfmoon Creek stock","MM-90",-1.06503888889e+002,3.91366666663e+001,"Leadville","Mount Massive","K/Ar","Biotite",54.400000,"2","54.4","Van Loenen and others (1989)","Location from Wallace (1993, 1995).  Intensely altered."]
["Granite","Pluton of Wilson Park","BR-1",-1.05310277778e+002,3.85838888886e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1686.000000,"50","1722 ± 50","Vera and Van Schmus (1974)","Average of 4 model ages (initial 87Sr/86Sr=0.705) of highly radiogenic samples.  (Sample 1 of 4)  Fourth sample on Canon City 1:100,000 quadrangle."]
["Quartz monzonite","Crampton Mountain pluton","BR-10",-1.05307777778e+002,3.85563888890e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 5 of 8)  Other samples on Canon City 1:100,000 quadrangle."]
["Pegmatite","Intrudes pluton of Wilson Park","BR-13",-1.05308333333e+002,3.85624999999e+001,"Pikes Peak","Rice Mountain","Rb-Sr","K-feldspar",1538.000000,"Not report","1571","Vera and Van Schmus (1974)","Model age; initial 87Sr/86Sr=0.705."]
["Pegmatite","Intrudes pluton of Wilson Park","BR-13",-1.05308333333e+002,3.85624999999e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Muscovite",1481.000000,"Not report","1513","Vera and Van Schmus (1974)","Model age; initial 87Sr/86Sr=0.705."]
["Quartz monzonite","Pluton of Wilson Park","BR-14A",-1.05305000000e+002,3.85841666667e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 6 of 8)  Other samples on Canon City 1:100,000 quadrangle."]
["Quartz monzonite","Crampton Mountain pluton","BR-14A",-1.05305000000e+002,3.85841666667e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Plagioclase, K-feldspar, muscovite, whol",1400.000000,"50","1430 ± 50","Vera and Van Schmus (1974)","Mineral whole rock isochron \"normalized\" with similar isochron from sample BR-19A (on Canon City 1:100,000 quadrangle).  Approximate time of metamorphism."]
["Granite","Crampton Mountain pluton","BR-15",-1.05299722222e+002,3.85819444447e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1686.000000,"50","1722 ± 50","Vera and Van Schmus (1974)","Average of 4 model ages (initial 87Sr/86Sr=0.705) of highly radiogenic samples.  (Sample 3 of 4)  Fourth sample on Canon City 1:100,000 quadrangle."]
["Quartz monzonite","Crampton Mountain pluton","BR-17",-1.05328888889e+002,3.84883333330e+001,"Canon City","Royal Gorge","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 1 of 8)  Other samples on Pikes Peak 1:100,000 quadrangle.  Location approximate."]
["Granite","Crampton Mountain pluton","BR-18",-1.05328888889e+002,3.84883333330e+001,"Canon City","Royal Gorge","Rb-Sr","Whole-rock",1686.000000,"50","1722 ± 50","Vera and Van Schmus (1974)","Average of 4 model ages (initial 87Sr/86Sr=0.705) of highly radiogenic samples.  (Sample 4  of 4).  Other samples on Pikes Peak 1:100,000 quadrangle.  Locations approximate."]
["Quartz monzonite","Crampton Mountain pluton","BR-19A",-1.05309722222e+002,3.84963888886e+001,"Canon City","Royal Gorge","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 2 of 8)  Other samples on Pikes Peak 1:100,000 quadrangle.  Location approximate."]
["Quartz monzonite","Crampton Mountain pluton","BR-19A",-1.05309722222e+002,3.84963888886e+001,"Canon City","Royal Gorge","Rb-Sr","Plagioclase, K-feldspar, muscovite, whol",1400.000000,"50","1430 ± 50","Vera and Van Schmus (1974)","Mineral/whole-rock isochron \"normalized\" with similar isochron from sample BR-14A (on Pikes Peak 1:100,000 quadrangle). Approximate time of metamorphism.  Location approximate."]
["Quartz monzonite","Pluton of Wilson Park","BR-19B",-1.05309722222e+002,3.84963888886e+001,"Canon City","Royal Gorge","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 3 of 8)  Other samples on Pikes Peak 1:100,000 quadrangle.  Location approximate."]
["Granite","Pluton of Wilson Park","BR-2",-1.05310277778e+002,3.85838888886e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1686.000000,"50","1722 ± 50","Vera and Van Schmus (1974)","Average of 4 model ages (initial 87Sr/86Sr=0.705) of highly radiogenic samples.  (Sample 2 of 4)  Fourth sample on Canon City 1:100,000 quadrangle."]
["Quartz monzonite","Crampton Mountain pluton","BR-21",-1.05299444444e+002,3.85550000004e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 7 of 8)  Other samples on Canon City 1:100,000 quadrangle."]
["Quartz monzonite","Crampton Mountain pluton","BR-22",-1.05302777778e+002,3.85577777777e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 8 of 8)  Other samples on Canon City 1:100,000 quadrangle."]
["Pegmatite","Intrudes pluton of Wilson Park","BR-3",-1.05310277778e+002,3.85838888886e+001,"Pikes Peak","Rice Mountain","Rb-Sr","K-feldspar",1590.000000,"Not report","1624","Vera and Van Schmus (1974)","Model age; initial 87Sr/86Sr=0.705."]
["Pegmatite","Intrudes pluton of Wilson Park","BR-3",-1.05310277778e+002,3.85838888886e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Muscovite",1363.000000,"Not report","1392","Vera and Van Schmus (1974)","Model age; initial 87Sr/86Sr=0.705."]
["Pegmatite","Intrudes Wilson Park quartzite","BR-5",-1.05297222222e+002,3.85705555555e+001,"Pikes Peak","Rice Mountain","Rb-Sr","K-feldspar",1514.000000,"Not report","1547","Vera and Van Schmus (1974)","Model age; initial 87Sr/86Sr=0.705."]
["Pegmatite","Intrudes Wilson Park quartzite","BR-5",-1.05297222222e+002,3.85705555555e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Muscovite",1374.000000,"Not report","1404","Vera and Van Schmus (1974)","Model age; initial 87Sr/86Sr=0.705."]
["Quartz monzonite","Crampton Mountain pluton","BR-8",-1.05302777778e+002,3.85580555558e+001,"Pikes Peak","Rice Mountain","Rb-Sr","Whole-rock",1743.000000,"66","1781 ± 66","Vera and Van Schmus (1974)","Isochron based on 8 samples.  (Sample 4 of 8)  Other samples on Canon City 1:100,000 quadrangle."]
["Biotite rhyolite porphyry","Climax","1619-600",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","FT","Zircon",26.100000,"1.2","26.1 ± 1.2","Wallace (1993), (1995)",null]
["Granite","Climax","1650-525",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","FT","Zircon",18.200000,"0.9","18.2","Wallace (1993), (1995)",null]
["Altered rhyolite porphyry","Climax \"Central Mass\"","1683-623",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","FT","Zircon",23.300000,"1.1","23.3 ± 1.1","Wallace (1993), (1995)",null]
["Rhyolite","Ash in Troublesome Formation","65G57",-1.06298611111e+002,4.00333333331e+001,"Steamboat Springs","Junction Butte","FT","Zircon",12.800000,"2.3","13","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","66-281",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","K/Ar","Biotite",30.800000,"2","30.8","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","66-282",-1.06145833333e+002,3.93750000002e+001,"Leadville","Copper Mountain","K/Ar","Biotite",29.800000,"2","29.8","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","66-283",-1.06141666666e+002,3.93777777775e+001,"Leadville","Copper Mountain","K/Ar","Biotite",51.300000,"5","51.3","Wallace (1993), (1995)",null]
["Porphyry","Elk Mountain porphyry","67-1",-1.06169252800e+002,3.94576461964e+001,"Leadville","Copper Mountain","K/Ar","Biotite",37.600000,"1.6","37.6","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","67-2",-1.06173008364e+002,3.94578786873e+001,"Leadville","Copper Mountain","K/Ar","Biotite",41.000000,"2.1","41","Wallace (1993), (1995)",null]
["Rhyolite porphyry","Climax, late rhyolite porphyry","76-15",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","FT","Zircon",25.500000,"1.2","25.5 ± 1.2","Wallace (1993), (1995)",null]
["Rhyolite porphyry","Climax, rhyolite porphyry","77-821",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","FT","Zircon",33.200000,"2.1","33.2","Wallace (1993), (1995)",null]
["Monzogranite","Treasure Vault stock","83P100",-1.06521388889e+002,3.94091666668e+001,"Leadville","Mount Jackson","FT","Apatite",52.000000,"15.7","52","Wallace (1993), (1995)",null]
["Monzogranite","Treasure Vault stock","83P100",-1.06521388889e+002,3.94091666668e+001,"Leadville","Mount Jackson","FT","Zircon",69.400000,"7.2","69.4","Wallace (1993), (1995)",null]
["Porphyry","Elk Mountain porphyry","87N12",-1.06213623321e+002,3.94015249108e+001,"Leadville","Copper Mountain","FT","Apatite",41.900000,"9.5","41.9","Wallace (1993), (1995)",null]
["Porphyry","Elk Mountain porphyry","87N12",-1.06213623321e+002,3.94015249108e+001,"Leadville","Copper Mountain","FT","Zircon",50.900000,"5.2","50.9","Wallace (1993), (1995)",null]
["Porphyry","Quail Porphyry","87N13",-1.06203748317e+002,3.94189366405e+001,"Leadville","Copper Mountain","FT","Apatite",41.600000,"10.4","41.6","Wallace (1993), (1995)",null]
["Porphyry","Quail Porphyry","87N13",-1.06203748317e+002,3.94189366405e+001,"Leadville","Copper Mountain","FT","Zircon",44.400000,"5.3","44.4","Wallace (1993), (1995)",null]
["Porphyry","Quail Porphyry","87N14",-1.06204026032e+002,3.94181032945e+001,"Leadville","Copper Mountain","FT","Zircon",40.400000,"4.5","40.4","Wallace (1993), (1995)",null]
["Porphyry","Quail Porphyry","87N14",-1.06204026032e+002,3.94181032945e+001,"Leadville","Copper Mountain","FT","Apatite",46.100000,"8.2","46.1","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","87N15",-1.06190277777e+002,3.94230555552e+001,"Leadville","Copper Mountain","FT","Zircon",40.100000,"3.9","40.1","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","87N15",-1.06190277777e+002,3.94230555552e+001,"Leadville","Copper Mountain","FT","Apatite",48.600000,"6.6","48.6","Wallace (1993), (1995)",null]
["Porphyry","Elk Mountain porphyry","87N16",-1.06197680161e+002,3.94190533986e+001,"Leadville","Copper Mountain","FT","Zircon",37.600000,"3.7","37.6","Wallace (1993), (1995)",null]
["Porphyry","Elk Mountain porphyry","87N16",-1.06197680161e+002,3.94190533986e+001,"Leadville","Copper Mountain","FT","Apatite",51.500000,"12.3","51.5","Wallace (1993), (1995)",null]
["Quartz latite","Stock of Tucker Mountain","90N1",-1.06169722222e+002,3.94549999998e+001,"Leadville","Copper Mountain","FT","Zircon",38.300000,"4.4","38.3","Wallace (1993), (1995)",null]
["Quartz monzonite","Stock of Tucker Mountain","90N2",-1.06168682562e+002,3.94591328036e+001,"Leadville","Copper Mountain","FT","Apatite",36.700000,"3.8","36.7","Wallace (1993), (1995)",null]
["Quartz monzonite","Stock of Tucker Mountain","90N2",-1.06168682562e+002,3.94591328036e+001,"Leadville","Copper Mountain","FT","Zircon",41.800000,"3","41.8","Wallace (1993), (1995)",null]
["Rhyolite porphyry","Stock of Tucker Mountain","90N3",-1.06171536039e+002,3.94510615898e+001,"Leadville","Copper Mountain","FT","Zircon",39.500000,"4.5","39.5","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","90N4",-1.06192796608e+002,3.94340069206e+001,"Leadville","Copper Mountain","FT","Apatite",36.700000,"3.9","36.7","Wallace (1993), (1995)",null]
["Granodiorite porphyry","Lincoln Porphyry","90N4",-1.06192796608e+002,3.94340069206e+001,"Leadville","Copper Mountain","FT","Zircon",41.500000,"3.7","41.5","Wallace (1993), (1995)",null]
["Porphyry","Quail Porphyry","90N5",-1.06202081644e+002,3.94189367178e+001,"Leadville","Copper Mountain","FT","Apatite",45.300000,"8.3","45.3","Wallace (1993), (1995)",null]
["Porphyry","Quail Porphyry","90N5",-1.06202081644e+002,3.94189367178e+001,"Leadville","Copper Mountain","FT","Zircon",51.000000,"5.1","51","Wallace (1993), (1995)",null]
["Granite","Precambrian granite at Climax mine","B-230",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","K/Ar","Biotite",74.900000,"2.3","74.9","Wallace (1993), (1995)",null]
["Granite","Precambrian granite at Climax mine","B-232",-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","K/Ar","Biotite",96.400000,"2.9","96.4","Wallace (1993), (1995)",null]
["Porphyry","Johnson Gulch Porphyry","FT-10",-1.06224954360e+002,3.92306831483e+001,"Leadville","Mount Sherman","FT","Apatite",43.100000,"7.6","43.1","Wallace (1993), (1995)",null]
["Porphyry","Johnson Gulch Porphyry","FT-10",-1.06224705866e+002,3.92304950335e+001,"Leadville","Mount Sherman","FT","Zircon",43.100000,"4.3","43.1","Wallace (1993), (1995)",null]
["Quartz monzonite","Mount Bellview quartz monzonite","MB-4",-1.07018611111e+002,3.90163888892e+001,"Carbondale","Snowmass Mountain","K/Ar","Biotite (?)",24.200000,"1.4","24.2","Wallace (1993), (1995)",null]
["Quartz latite","Pando Porphyry","MM-54",-1.06528611111e+002,3.91611111114e+001,"Leadville","Mount Champion","K/Ar","Biotite",399.000000,"15","399","Wallace (1993), (1995)","Too old; excess radiogenic argon or Proterozoic xenocrysts."]
["Granite","Cross Creek pluton","W3122",-1.06533333333e+002,3.94833333337e+001,"Leadville","Mount Jackson","FT","Apatite",55.900000,"20","55.9","Wallace (1993), (1995)",null]
["Diorite","West Cross Creek diorite","W3123",-1.06537500000e+002,3.94277777773e+001,"Leadville","Mount Jackson","FT","Apatite",51.100000,"11","51.1","Wallace (1993), (1995)",null]
["Migmatite","Holy Cross area","W3124",-1.06562500000e+002,3.94597222219e+001,"Leadville","Mount Jackson","FT","Apatite",65.900000,"23","65.9","Wallace (1993), (1995)",null]
["Unnamed","Fulford stock","W3125",-1.06616666666e+002,3.95305555553e+001,"Vail","Fulford","FT","Apatite",43.100000,"10","43.1","Wallace (1993), (1995)",null]
["Porphyry","Johnson Gulch Porphyry",null,-1.06237500000e+002,3.92333333334e+001,"Leadville","Mount Sherman","K/Ar","Sericite",39.600000,"1.7","39.6","Wallace (1993), (1995)",null]
["Latite","Timberline Lake breccia",null,-1.06477777778e+002,3.92916666670e+001,"Leadville","Homestake Reservoir","K/Ar","Sericite",35.900000,"1.2","35.9","Wallace (1993), (1995)",null]
["Monzogranite","Treasure Vault stock",null,-1.06166666667e+002,3.92999999999e+001,"Leadville","Climax","K/Ar","Biotite (?)",1430.000000,"45","1430","Wallace (1993), (1995)",null]
["Porphyry","Turquoise Lake Porphyry",null,-1.06402882435e+002,3.92778930376e+001,"Leadville","Homestake Reservoir","K/Ar","Sericite",35.600000,"1.4","35.6","Wallace (1993), (1995)",null]
["Quartz monzonite","Buckskin Gulch stock",null,-1.06125555556e+002,3.93166666665e+001,"Leadville","Climax","K/Ar","Biotite",71.400000,"2.4","71.4","Wallace (1993), (1995)",null]
["Trachyte","Green Mountain trachyte dike",null,-1.06326859301e+002,3.98668361153e+001,"Vail","Mount Powell","FT","Zircon",29.900000,"2.4","29.9","Wallace (1993), (1995)",null]
["Granite","Henry Mountain pluton","A38G-II",-1.06636882004e+002,3.84649117057e+001,"Saguache","Doyleville","Rb-Sr","Plagioclase, K-feldspar, muscovite, whol",1248.000000,"30","1275 ± 30","Wetherill and Bickford (1965)","Whole-rock/mineral isochron.  Location approximate."]
["Granite","Henry Mountain pluton","A38G-II",-1.06636882004e+002,3.84649117057e+001,"Saguache","Doyleville","Rb-Sr","Whole-rock",1615.000000,"35","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 4 of 13)  Other samples on Gunnison, Montrose, Leadville, and Vail 1:100,000 quadrangles.  Location approximate."]
["Pegmatite wall rock","Brown Derby area","CO-1",-1.06660833333e+002,3.85497222220e+001,"Gunnison","Parlin","Rb-Sr","Whole-rock",1365.000000,"Not report","1395","Wetherill and Bickford (1965)","Model age."]
["Pegmatite wall rock","Brown Derby area","CO-1",-1.06660833333e+002,3.85497222220e+001,"Gunnison","Parlin","Rb-Sr","Muscovite",1224.000000,"Not report","1250","Wetherill and Bickford (1965)","Model age."]
["Pegmatite","Brown Derby area","CO-16",-1.06627777777e+002,3.85827777781e+001,"Gunnison","Parlin","Rb-Sr","Muscovite",1386.000000,"Not report","1416","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Pegmatite","Brown Derby area","CO-16",-1.06627777777e+002,3.85827777781e+001,"Gunnison","Parlin","Rb-Sr","Biotite",1434.000000,"Not report","1465","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Pegmatite","Brown Derby area","CO-16",-1.06627777777e+002,3.85827777781e+001,"Gunnison","Parlin","Rb-Sr","Biotite (replicate)",1404.000000,"Not report","1434","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Pegmatite","Brown Derby area","CO-16",-1.06627777777e+002,3.85827777781e+001,"Gunnison","Parlin","Rb-Sr","Biotite (replicate)",1413.000000,"Not report","1444","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Pegmatite","Brown Derby area","CO-16",-1.06627777777e+002,3.85827777781e+001,"Gunnison","Parlin","Rb-Sr","K-feldspar",1403.000000,"Not report","1433","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Pegmatite","Brown Derby area","CO-2",-1.06662500000e+002,3.85525000002e+001,"Gunnison","Parlin","Rb-Sr","Biotite",1337.000000,"Not report","1366","Wetherill and Bickford (1965)","Model age."]
["Pegmatite","Brown Derby area","CO-2",-1.06662500000e+002,3.85525000002e+001,"Gunnison","Parlin","Rb-Sr","K-feldspar",1407.000000,"Not report","1437","Wetherill and Bickford (1965)","Model age."]
["Granite","Henry Mountain pluton","CO-20",-1.06650367608e+002,3.85409413613e+001,"Gunnison","Parlin","Rb-Sr","Apatite, plagioclase, muscovite, biotite",1360.000000,"20","1384 ± 20","Wetherill and Bickford (1965)","Mineral isochron."]
["Granite","Henry Mountain pluton","CO-20",-1.06650367608e+002,3.85409413613e+001,"Gunnison","Parlin","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 1 of 13).  Other samples on Saguache, Montrose, Leadville, and Vail 1:100,000 quadrangles."]
["Granitic gneiss","Red Cliff area","CO-36",-1.06377777778e+002,3.95055555558e+001,"Vail","Red Cliff","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 13 of 13).  Other samples on Gunnison, Saguache, Montrose, and Leadville 1:100,000 quadrangles.  Location from Wallace (1993, 1995)."]
["Granite","Cross Creek pluton dike","CO-37",-1.06370833333e+002,3.94916666665e+001,"Leadville","Pando","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 12 of 13).  Other samples on Gunnison, Saguache, Montrose, and Vail 1:100,000 quadrangles.  Location from Wallace (1993, 1995)."]
["Granite","Big Union pluton","CO-38",-1.06284722223e+002,3.90833333329e+001,"Leadville","Granite","Rb-Sr","Whole-rock",1420.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 11 of 13).  Other samples on Gunnison, Saguache, Montrose, and Vail 1:100,000 quadrangles.  Location from Wallace (1993, 1995)."]
["Granite","Denny Creek pluton (?)","CO-42",-1.06573377714e+002,3.91125635364e+001,"Leadville","Independence Pass","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 10 of 13).  Other samples on Gunnison, Saguache, Montrose, and Vail 1:100,000 quadrangles.  Location and recalcultated age from Fridrich and others (1991)."]
["Granodiorite","Monarch Pass","CO-55",-1.06351944444e+002,3.84497222223e+001,"Saguache","Pahlone Peak","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 5 of 13).  Other samples on Gunnison, Montrose, Leadville, and Vail 1:100,000 quadrangles.  Location approximate."]
["Granite","Near Sargents","CO-58",-1.06494444444e+002,3.84024999997e+001,"Saguache","Sargents","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 6 of 13).  Other samples on Gunnison, Montrose, Leadville, and Vail 1:100,000 quadrangles.  Location approximate."]
["Granite","Henry Mountain pluton","CO-59",-1.06636944445e+002,3.84647222222e+001,"Saguache","Houston Gulch","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples.( Sample 8 of 13).  Other samples on Gunnison, Montrose, Leadville, and Vail 1:100,000 quadrangles.  Location approximate."]
["Pegmatite","Near Doyleville","CO-6",-1.06671388889e+002,3.85747222224e+001,"Gunnison","Parlin","Rb-Sr","Biotite",1009.000000,"Not report","1031","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Granite","Roosevelt pluton","CO-61",-1.06537329892e+002,3.85873969577e+001,"Gunnison","Pitkin","Rb-Sr","Whole-rock",1600.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Minimum age.  Isochron based on 13 samples. (Sample 3 of 13).  Other samples on Saguache, Montrose, Leadville, and Vail 1:100,000 quadrangles."]
["Granite","Granite of Taylor River","CO-64",-1.06768888889e+002,3.87261111107e+001,"Gunnison","Almont","Rb-Sr","Plagioclase, K-feldspar, muscovite, whol",1380.000000,"19","1397 ± 35","Wetherill and Bickford (1965)","Mineral-whole rock isochron.  Recalculated date in DeWitt and others (2002).  Location approximate."]
["Granite","Granite of Taylor River","CO-64",-1.06768888889e+002,3.87261111107e+001,"Gunnison","Almont","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 2 of 13).  Location approximate.  Other samples on Saguache, Montrose, Leadville, and Vail 1:100,000 quadrangles."]
["Granodiorite","South Beaver Creek pluton","CO-73",-1.07028611111e+002,3.84955555553e+001,"Montrose","Big Mesa","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 9 of 13).  Other samples on Gunnison, Saguache, Leadville, and Vail 1:100,000 quadrangles.  Location approximate; estimated from Montrose 1:250,000 scale geologic map."]
["Granite","Quartz Monzonite of Cochetopa Creek","CO-74",-1.06765555555e+002,3.83305555558e+001,"Saguache","Sawtooth Mountain","Rb-Sr","Whole-rock, biotite",1327.000000,"25","1356 ± 25","Wetherill and Bickford (1965)","Whole-rock/mineral isochron."]
["Granite","Quartz Monzonite of Cochetopa Creek","CO-74",-1.06765555555e+002,3.83305555558e+001,"Saguache","Sawtooth Mountain","Rb-Sr","Whole-rock",1615.000000,"19","1650 ± 35","Wetherill and Bickford (1965)","Isochron based on 13 samples. (Sample 7 of 13).  Other samples on Gunnison, Montrose, Leadville, and Vail 1:100,000 quadrangles."]
["Pegmatite","Brown Derby area","CO-9",-1.06660000000e+002,3.85747222224e+001,"Gunnison","Parlin","Rb-Sr","Muscovite",1355.000000,"Not report","1384","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Pegmatite","Brown Derby area","CO-9",-1.06660000000e+002,3.85747222224e+001,"Gunnison","Parlin","Rb-Sr","K-feldspar",1361.000000,"Not report","1390","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Pegmatite","Brown Derby area","CO-9",-1.06660000000e+002,3.85747222224e+001,"Gunnison","Parlin","Rb-Sr","Biotite",1105.000000,"Not report","1129","Wetherill and Bickford (1965)","Model age.  Location approximate."]
["Altered rhyolite porphyry","Climax, late barren stage sericite",null,-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","K/Ar","Sericite",25.300000,"0.3","25.3","White and others (1981)","Location from Wallace (1993, 1995)."]
["Altered granite","Climax, upper orebody",null,-1.06163409831e+002,3.93729555345e+001,"Leadville","Climax","K/Ar","Sericite",30.600000,"0.4","29.8","White and others (1981)","Location from Wallace (1993, 1995)."]
["Whitehorn stock","Whitehorn stock","79",-1.05920051261e+002,3.86236866134e+001,"Pikes Peak","Salida East","K/Ar","Biotite",70.800000,"2.1","70.4","Young (1972)","Location very approximate.  Age recalculated by Chualaowanich (1996)."]
["Whitehorn stock","Whitehorn stock","80",-1.05920052784e+002,3.86238058203e+001,"Pikes Peak","Salida East","K/Ar","Hornblende",70.000000,"2.1","69.4","Young (1972)","Location very approximate.  Age recalculated by Chualaowanich (1996)."]
["Granite","Sherman Granite","CR-48",-1.05236900000e+002,4.09918999997e+001,"Fort Collins","Table Mountain","Rb-Sr","Whole-rock",1400.000000,"20",null,"Zielinski and others (1981)","Isochron defined by 6 samples from drill core."]
["trachyandesite","Spanish Peaks radial dike swarm","45-C-7",-1.04949000739e+002,3.73232375755e+001,"Trinidad","Herlick Canyon","FT","Apatite",27.000000,"4.8","27.3 ± 4.8","Smith (1975)","Approximate location."]
["trachyandesite","Spanish Peaks radial dike swarm","609-C-14",-1.04942855732e+002,3.73592878262e+001,"Trinidad","Herlick Canyon","FT","Apatite",23.200000,"Not report","23.2","Smith (1975)","Location approximate."]
["latite","Spanish Peaks radial dike swarm","657-C-46",-1.04987968923e+002,3.73379737268e+001,"Trinidad","Herlick Canyon","FT","Apatite",22.500000,"Not report","22.5","Smith (1975)","Location approximate."]
["Quartz Monzonite","West Spanish Peak stock","WSP-1",-1.04988566521e+002,3.73762537656e+001,"Trinidad","Spanish Peaks","FT","Apatite",23.000000,"2","23.0","Smith (1975)","location approximate."]
["Granodiorite","East Spanish Peak stock","ESP-1",-1.04917507163e+002,3.73946729726e+001,"Trinidad","Spanish Peaks","FT","Apatite",19.800000,"1.2","19.8","Smith (1975)","location approximate."]
["Granodiorite","East Spanish Peak stock",null,-1.04923610000e+002,3.73971700004e+001,"Trinidad","Spanish Peaks","K/Ar","biotite",21.700000,"1","21.7","Stormer (1972)","Location approximate."]
["Biotite-pyrite-quartz vein","Cripple Creek deposit","37K122",-1.05160300000e+002,3.87530600003e+001,"Pikes Peak","Cripple Creek North","40Ar/39Ar","Biotite",29.900000,"0.1","29.9","Kelley and others (1998)","Plateau age."]
["Tephriphonolite","Cripple Creek deposit","530N2",-1.05131900000e+002,3.87367799999e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Biotite",32.300000,"0.1","32.3","Kelley and others (1998)","Plateau age."]
["Altered phonolite","Cripple Creek deposit","CC001A",-1.05133900000e+002,3.87361099996e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Sanidine-adularia",28.800000,"0.1","28.8","Kelley and others (1998)","Isochron age."]
["Altered phonolite","Cripple Creek deposit","CC001B",-1.05133900000e+002,3.87361099996e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Adularia",28.200000,"0.1","28.2","Kelley and others (1998)","Isochron age."]
["Adularia-biotite-pyrite vein","Cripple Creek deposit","CC003",-1.05142500000e+002,3.87205500000e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Adularia",31.300000,"0.1","31.3","Kelley and others (1998)","Plateau age."]
["Phonolite","Cripple Creek deposit","CC004",-1.05131900000e+002,3.87352800000e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Sanidine",31.800000,"0.2","31.8","Kelley and others (1998)","Weighted mean age."]
["Phonotephrite","Cripple Creek deposit","CC005",-1.05133100000e+002,3.87355499999e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Whole-rock",29.100000,"0.2","29.1","Kelley and others (1998)","Isochron age; preferred age is 28.7 Ma based on mimimum age in spectrum and regarded as maximum possible age for sample."]
["Trachyandesite","Cripple Creek deposit","CC007",-1.05124658629e+002,3.87187144433e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Whole-rock",31.600000,"0.2","31.6","Kelley and others (1998)","Weighted mean age; regarded as maximum possible age."]
["Phonolite","Cripple Creek deposit","CC009",-1.05128623209e+002,3.87342171012e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Sanidine",31.600000,"0.2","31.6","Kelley and others (1998)","Weighted mean age; regarded as maximum possible age."]
["Tephriphonolite","Cripple Creek deposit","CC010S",-1.05127000000e+002,3.87266699997e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Sanidine",32.500000,"0.1","32.5","Kelley and others (1998)","Plateau age."]
["Adularia-quartz vein","Cripple Creek deposit","CC2",-1.05133500000e+002,3.87361800001e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Adularia",29.600000,"0.1","29.6","Kelley and others (1998)","Plateau age."]
["Phonolite","Cripple Creek deposit","CCPH1",-1.05038620815e+002,3.87696895420e+001,"Pikes Peak","Pikes Peak","40Ar/39Ar","Sanidine",30.900000,"0.1","30.9","Kelley and others (1998)","Plateau age."]
["Breccia matrix with gold and pyrite","Cripple Creek deposit","CRESA-4",-1.05127500000e+002,3.87271100002e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Adularia",29.800000,"0.1","29.8","Kelley and others (1998)","Plateau age."]
["Granite","Garrel Peak pluton","081297-1",-1.05760000000e+002,3.84899999997e+001,"Canon City","Howard","40Ar/39Ar","Hornblende",1536.000000,"3","1536","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","0817-1",-1.05528421896e+002,3.84476542169e+001,"Canon City","Echo","40Ar/39Ar","Biotite",1305.000000,"5","1330","Shaw and others (2005)","Total gas age.  Continuously climbing spectrum.  Meaningless age.  Decay constant of Kwon and others (2002). Conflicting locations."]
["Granite","Buffalo Pass pluton","97PARK10h",-1.06720000000e+002,4.05300000000e+001,"Walden","Buffalo Pass","40Ar/39Ar","Hornblende",1551.000000,"6","1570","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Maximum age is 1605 Ma.  Used decay constant of Kwon and others (2002)."]
["Granite","Buffalo Pass pluton","97PARK11",-1.06710000000e+002,4.05300000000e+001,"Walden","Buffalo Pass","40Ar/39Ar","Hornblende",1593.000000,"4","1598","Shaw and others (2005)","Total gas age.  Erractic spectrum.  Meaningless age.  Maximum age is 1620 Ma.  Used decay constant of Kwon and others (2002)."]
["Granite","Buffalo Pass pluton","97PARK11",-1.06710000000e+002,4.05300000000e+001,"Walden","Buffalo Pass","40Ar/39Ar","Biotite",1400.000000,"9","1456","Shaw and others (2005)","Total gas age. Erractic spectrum.  Meaningless age. Maximum age is 1620 Ma.  Decay constant of Kwon and others (2002)."]
["Granite","Mount Ethel pluton","97PARK12C",-1.06686991143e+002,4.05866981117e+001,"Walden","Buffalo Pass","40Ar/39Ar","Hornblende",1421.000000,"4","1449","Shaw and others (2005)","Total gas age.  Continually declining spectrum.  Meaningless age.  Maximum age is 1460 Ma.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Metasedimentary gneiss","97PARK2B",-1.06690000000e+002,4.03800000004e+001,"Steamboat Springs","Mount Werner","40Ar/39Ar","Biotite",1423.000000,"2","1423","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Metasedimentary gneiss","97PARK2B",-1.06690000000e+002,4.03800000004e+001,"Steamboat Springs","Mount Werner","40Ar/39Ar","Hornblende",1711.000000,"6","1707","Shaw and others (2005)","Total gas age.  Erractic spectrum.  Meaningless age.  Maximum age is 1730 Ma.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Metasedimentary gneiss","97PARK-6",-1.06782750550e+002,4.03693302478e+001,"Steamboat Springs","Blacktail Mountain","40Ar/39Ar","Hornblende",1688.000000,"5","1713","Shaw and others (2005)","Total gas age.  Erractic spectrum.  Meaningless age.  Maximum age is 1740 Ma.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Metasedimentary gneiss","97PARK-6",-1.06782750550e+002,4.03693302478e+001,"Steamboat Springs","Blacktail Mountain","40Ar/39Ar","Biotite",1454.000000,"3","1454","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Metasedimentary gneiss","97PARK-9B",-1.06807280159e+002,4.03880036131e+001,"Steamboat Springs","Steamboat Springs","40Ar/39Ar","Biotite",1333.000000,"11","1377","Shaw and others (2005)","Total gas age.  Erractic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","C97HS-3",-1.06321512681e+002,3.94263007848e+001,"Leadville","Pando","40Ar/39Ar","Muscovite",1401.000000,"1","1401","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","C97HS-4H",-1.06321512681e+002,3.94263007848e+001,"Leadville","Pando","40Ar/39Ar","Actinolite",1427.000000,"5","1512","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age. Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","C99HS-1",-1.06321512681e+002,3.94263007848e+001,"Leadville","Pando","40Ar/39Ar","Hornblende",1488.000000,"6","1544","Shaw and others (2005)","Total gas age.  Concave upward spectrum.  Meaningless age. Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","C99HS-1",-1.06321512681e+002,3.94263007848e+001,"Leadville","Pando","40Ar/39Ar","Biotite",1395.000000,"2","1395","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","C99HS-16",-1.06361511757e+002,3.94863003157e+001,"Leadville","Pando","40Ar/39Ar","Muscovite",1256.000000,"18","1312","Shaw and others (2005)","Total gas age.  Continuous loss pattern. Maximum age 1370 Ma.  Meaningless age. Decay constant of Kwon and others (2002)."]
["Granite","Crampton Mountain pluton","CD-1",-1.05390000000e+002,3.85200000004e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1370.000000,"4","1380","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Crampton Mountain pluton","CD-2",-1.05430000000e+002,3.85599999997e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Muscovite",1389.000000,"1","1389","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Fourmile pluton","CD-4",-1.05429654821e+002,3.85959336048e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1342.000000,"2","1342","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Fourmile pluton","CD-4",-1.05429654821e+002,3.85959336048e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Muscovite",1345.000000,"3","1364","Shaw and others (2005)","Near Plateau.  Used decay constant of Kwon and others (2002)."]
["Granite","Fourmile pluton","CD-5a",-1.05440000000e+002,3.86200000001e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Muscovite",1373.000000,"2","1373","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Fourmile pluton","CD-5a",-1.05440000000e+002,3.86200000001e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1360.000000,"2","1360","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Metasediments (?)","CD-7",-1.05580000000e+002,3.87800000002e+001,"Pikes Peak","Thirtynine Mile Mountain","40Ar/39Ar","Biotite",1310.000000,"3","1320","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","COO HS-11",-1.06341512421e+002,3.94663005521e+001,"Leadville","Pando","40Ar/39Ar","Biotite",1391.000000,"13","1391","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","COO HS-11",-1.06341512421e+002,3.94663005521e+001,"Leadville","Pando","40Ar/39Ar","Hornblende",1580.000000,"7","1403","Shaw and others (2005)","Total gas age.  Lowest age at highest retention temperature.  Meaninlgess age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","COOHS-12",-1.06380533988e+002,3.95095406037e+001,"Vail","Minturn","40Ar/39Ar","Biotite",1388.000000,"3","1388","Shaw and others (2005)","Near Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","COO HS-3",-1.06461503832e+002,3.93562990842e+001,"Leadville","Homestake Reservoir","40Ar/39Ar","Hornblende",1321.000000,"14","1413","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Mafic metavolcanic rocks","Central Park Range","FM-00-04",-1.06793733470e+002,4.08187056189e+001,"Walden","Farwell Mountain","40Ar/39Ar","Biotite",1399.000000,"4","1440","Shaw and others (2005)","Total gas age.  Continually declining age.  Maximum age 1460 Ma.  Used decay constant of Kwon and others (2002)."]
["Mafic metavolcanic rocks","Central Park Range","FM-00-04",-1.06793997882e+002,4.08188984408e+001,"Walden","Farwell Mountain","40Ar/39Ar","Muscovite",1483.000000,"9","1494","Shaw and others (2005)","Total gas age.  Continually declining age.  Maximum age 1540 Ma.  Used decay constant of Kwon and others (2002)."]
["Metasedimetary rocks","West side of Rabbit Ears Pass","K98 PK 27A",-1.06893921668e+002,4.07716760411e+001,"Walden","Hahns Peak","40Ar/39Ar","Muscovite",1497.000000,"4","1512","Shaw and others (2005)","Total gas age.  Constantly declining spectrum.  Maximum age 1560 Ma.  Used decay constant of Kwon and others (2002)."]
["Metasedimetary rocks","West side of Rabbit Ears Pass","K98 PK 27A",-1.06893996059e+002,4.07717302072e+001,"Walden","Hahns Peak","40Ar/39Ar","Biotite",1465.000000,"2","1465","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Mixed metavolcanic and metasedimentary rocks","Salida area","K98-SAL-2",-1.06000000000e+002,3.86299999997e+001,"Gunnison","Nathrop","40Ar/39Ar","Muscovite",1365.000000,"3","1371","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Mixed metavolcanic and metasedimentary rocks","Salida area","K98-SAL-2",-1.06000000000e+002,3.86299999997e+001,"Gunnison","Nathrop","40Ar/39Ar","Biotite",1335.000000,"4","1347","Shaw and others (2005)","Total gas age.  Continuously climbing sprectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Mixed metavolcanic and metasedimentary rocks","Salida area","K98-SAL-3",-1.06000000000e+002,3.86299999997e+001,"Gunnison","Nathrop","40Ar/39Ar","Hornblende",1452.000000,"11","1452","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-3b",-1.05130000000e+002,3.81300000002e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Hornblende",1395.000000,"3","1382","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-2",-1.05120000000e+002,3.81300000002e+001,"Canon City","Wetmore","40Ar/39Ar","Hornblende",1432.000000,"6","1385","Shaw and others (2005)","Total gas age.  Concave upward spectrum.  Meaningless age.  Actinolitic.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-3a",-1.05130000000e+002,3.81300000002e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Hornblende",1358.000000,"3","1358","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-4a",-1.05150000000e+002,3.81300000002e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Hornblende",1376.000000,"4","1376","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-4b",-1.05150000000e+002,3.81300000002e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Hornblende",1392.000000,"3","1385","Shaw and others (2005)","Total gas age.  Continually declining spectrum.  Meaningless age.  Actinolitic.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-4c",-1.05150000000e+002,3.81300000002e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Hornblende",1381.000000,"3","1381","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-5b",-1.05150000000e+002,3.81300000002e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Biotite",1253.000000,"2","1252","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-6",-1.05210000000e+002,3.81399999998e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Actinolite",1361.000000,"3","1361","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-6",-1.05210000000e+002,3.81399999998e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Biotite",1422.000000,"1","1422","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-7b",-1.05210000000e+002,3.81399999998e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Hornblende",1375.000000,"4","1375","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-7c",-1.05210000000e+002,3.81399999998e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Biotite",1314.000000,"2","1405","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Unnamed","Hardscrabble Creek area","KEK-7c",-1.05210000000e+002,3.81399999998e+001,"Canon City","Hardscrabble Mountain","40Ar/39Ar","Hornblende",1357.000000,"2","1357","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","KHS99-1",-1.06360000000e+002,3.94800000001e+001,"Leadville","Pando","40Ar/39Ar","Biotite",1411.000000,"3","1411","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","KHS99-1",-1.06360000000e+002,3.94800000001e+001,"Leadville","Pando","40Ar/39Ar","Hornblende",1505.000000,"9","1565","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","KHS99-2",-1.06360000000e+002,3.94800000001e+001,"Leadville","Pando","40Ar/39Ar","Biotite",1385.000000,"2","1385","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","KHS99-2",-1.06360000000e+002,3.94800000001e+001,"Leadville","Pando","40Ar/39Ar","Actinolite",1618.000000,"33","1649","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","KHS99-3",-1.06461503832e+002,3.93562990842e+001,"Leadville","Pando","40Ar/39Ar","Biotite",1389.000000,"3","1405","Shaw and others (2005)","Total gas age.  Continuous loss pattern.  Maximum age 1440 Ma. Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Mixed metsedimentary and metavolcanic rock","Pearl area","KK99-PK-65",-1.06562150651e+002,4.09270355395e+001,"Walden","Pearl","40Ar/39Ar","Actinolite",1602.000000,"23","1,612","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Texas Creek area","KOO BR 20",-1.05528421896e+002,3.84476542169e+001,"Canon City","Echo","40Ar/39Ar","Muscovite",1298.000000,"6","1295","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Texas Creek area","KOO BR-21",-1.05528421896e+002,3.84476542169e+001,"Canon City","Echo","40Ar/39Ar","Hornblende",1475.000000,"8","1479","Shaw and others (2005)","Total gas age.  Continuously climbing spectrum.  Maximum age. 1585 Ma.  Meaningless age.  Decay constant of Kwon and others (2002)."]
["Unnamed","Wilson Park area","KOO BR-10-5",-1.05310000000e+002,3.85599999997e+001,"Pikes Peak","Rice Mountain","40Ar/39Ar","Muscovite",1164.000000,"17","1275","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Maximum age 1410 Ma.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Pluton of Wilson Park","KOO BR 21",-1.05300000000e+002,3.85799999999e+001,"Pikes Peak","Rice Mountain","40Ar/39Ar","Biotite",1307.000000,"4","1320","Shaw and others (2005)","Total gas age.  Continuously climbing spectrum.  Maximum age 1360 Ma.  Meaningless age.  Decay constant of Kwon and others (2002)."]
["Mafic metavolcanic","Farwell Mountain","KOO FM-1",-1.06865859714e+002,4.08214362520e+001,"Walden","Farwell Mountain","40Ar/39Ar","Hornblende",1482.000000,"6","1510","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Constantly declining spectra.  Maximum age 1705 Ma.  Used decay constant of Kwon and others (2002)."]
["Mafic metavolcanic","Farwell Mountain","KOO FM-1",-1.06865859714e+002,4.08214362520e+001,"Walden","Farwell Mountain","40Ar/39Ar","Biotite",1247.000000,"11","1314","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Constantly declining spectra.  Used decay constant of Kwon and others (2002)."]
["Mafic metavolcanic","Farwell Mountain","KOO FM-2",-1.06865655568e+002,4.08215179689e+001,"Walden","Farwell Mountain","40Ar/39Ar","Actinolite",1583.000000,"4","1572","Shaw and others (2005)","Total gas age.  Erratic spectrum,  Constantly declining spectra.  Maximum age 1630 Ma.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Texas Creek area","KOO-BR-1",-1.05528421896e+002,3.84476542169e+001,"Canon City","Echo","40Ar/39Ar","Muscovite",1380.000000,"2","1380","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Mafic metavolcanic rocks","Farwell Mountain","KOO-FM-3",-1.06794127435e+002,4.08188964263e+001,"Walden","Farwell Mountain","40Ar/39Ar","Hornblende",1553.000000,"2","1553","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","KOO-HS-10",-1.06380000000e+002,3.94600000000e+001,"Leadville","Mount of the Holy Cross","40Ar/39Ar","Muscovite",1378.000000,"2","1380","Shaw and others (2005)","Total gas age.  Continuous loss pattern.  Maximum age 1402 Ma  Used decay constant of Kwon and others (2002)."]
["Unnamed","Homestake shear zone","KOO-HS-2",-1.06360000000e+002,3.94800000001e+001,"Leadville","Pando","40Ar/39Ar","Actinolite",1622.000000,"27","1676","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Gore Range","KTM-99-2",-1.06170000000e+002,3.96000000000e+001,"Vail","Vail Pass","40Ar/39Ar","Biotite",1369.000000,"5","1395","Shaw and others (2005)","Total gas age.  Ages declines with increasing temperature.  Meaningless age.  Decay constant of Kwon and others (2002)."]
["Unnamed","Gore Range","KTM-99-7",-1.06170000000e+002,3.96000000000e+001,"Vail","Vail Pass","40Ar/39Ar","Biotite",1281.000000,"7","1338","Shaw and others (2005)","Total gas age.  Concave upward spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Metasedimentary rocks","Lester Peak","LMOO-15",-1.06893994486e+002,4.07716748459e+001,"Walden","Hahns Peak","40Ar/39Ar","Pyroxene",1761.000000,"3","1671","Shaw and others (2005)","Total gas age.  Constantly declining spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Hayden Pass","SC97-1",-1.05870000000e+002,3.82799999998e+001,"Canon City","Coaldale","40Ar/39Ar","Biotite",1378.000000,"3","1378","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","McCoy Gulch pluton","SC97-10A",-1.05578770767e+002,3.84078600067e+001,"Canon City","Echo","40Ar/39Ar","Muscovite",1370.000000,"2","1370","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","SC97-11A",-1.05530000000e+002,3.84300000003e+001,"Canon City","Echo","40Ar/39Ar","Muscovite",1370.000000,"3","1376","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","SC97-11B",-1.05530000000e+002,3.84300000003e+001,"Canon City","Echo","40Ar/39Ar","Hornblende",1265.000000,"3","1361","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","SC97-11C",-1.05530000000e+002,3.84300000003e+001,"Canon City","Echo","40Ar/39Ar","Hornblende",1457.000000,"2","1457","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","SC97-11C",-1.05530000000e+002,3.84300000003e+001,"Canon City","Echo","40Ar/39Ar","Biotite",1404.000000,"1","1404","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","SC97-11D",-1.05530000000e+002,3.84300000003e+001,"Canon City","Echo","40Ar/39Ar","Hornblende",1418.000000,"4","1476","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","SC97-11E",-1.05530000000e+002,3.84300000003e+001,"Canon City","Echo","40Ar/39Ar","Muscovite",1367.000000,"2","1367","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Texas Creek area","SC97-11F",-1.05530000000e+002,3.84300000003e+001,"Canon City","Echo","40Ar/39Ar","Muscovite",1319.000000,"4","1329","Shaw and others (2005)","Total gas age.  Continuously climbing spectrum.  Maximum age 1365 Ma.  Used decay constant of Kwon and others (2002)."]
["Granite","Garrel Peak pluton","SC97-12",-1.05680000000e+002,3.83699999999e+001,"Canon City","Cotopaxi","40Ar/39Ar","Hornblende",1514.000000,"6","1487","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Granite","Garrel Peak pluton","SC97-12",-1.05680000000e+002,3.83699999999e+001,"Canon City","Cotopaxi","40Ar/39Ar","Biotite",1302.000000,"2","1301","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Metavolcanic rocks","Salida area","SC97-13E",-1.05960000000e+002,3.85200000004e+001,"Pikes Peak","Salida East","40Ar/39Ar","Hornblende",1432.000000,"3","1432","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Henry Mountain pluton (?)","SC97-14B",-1.06010000000e+002,3.86499999998e+001,"Gunnison","Nathrop","40Ar/39Ar","Hornblende",1440.000000,"4","1440","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Mafic metavolcanic rocks (?)","Dubois greenstone","SC97-17A",-1.07095318198e+002,3.83509625576e+001,"Montrose","Powderhorn","40Ar/39Ar","Actinolite",1695.000000,"15","1695","Shaw and others (2005)","Total gas age.  Erratic spectrum. Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Mafic metavolcanic rocks (?)","Dubois greenstone","SC97-17B",-1.07095318198e+002,3.83509625576e+001,"Montrose","Powderhorn","40Ar/39Ar","Actinolite",1666.000000,"2","1666","Shaw and others (2005)","Total gas age.  Erratic spectrum. Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Tonalite","South Beaver Creek pluton","SC97-18",-1.07020000000e+002,3.85000000002e+001,"Paonia","McIntosh Mountain","40Ar/39Ar","Hornblende",1700.000000,"3","1700","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Two fractions at 1700 ma Used decay constant of Kwon and others (2002)."]
["Tonalite","South Beaver Creek pluton","SC97-18",-1.07020000000e+002,3.85000000002e+001,"Paonia","McIntosh Mountain","40Ar/39Ar","Biotite",1081.000000,"1","1081","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Two fractions at 1700 ma.  Used decay constant of Kwon and others (2002)."]
["Granite","Quartz Monzonite of Cochetopa Creek","SC97-19",-1.06770000000e+002,3.83299999996e+001,"Saguache","Sawtooth Mountain","40Ar/39Ar","Biotite",1377.000000,"5","1389","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Constantly declining spectra.  Two fractions at 1700 ma.  Decay constant of Kwon and others (2002)."]
["Gneiss","Hayden Pass","SC97-2",-1.05870000000e+002,3.82799999998e+001,"Canon City","Coaldale","40Ar/39Ar","Hornblende",1445.000000,"9","1447","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Maximum age. 1520 Ma.   Used decay constant of Kwon and others (2002)."]
["Gneiss","Hayden Pass","SC97-3",-1.05870000000e+002,3.82799999998e+001,"Canon City","Coaldale","40Ar/39Ar","Biotite",1344.000000,"5","1360","Shaw and others (2005)","Total gas age.  Continuously climbing spectrum.  Maximum age 1395 Ma.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Hayden Pass","SC97-4",-1.05870000000e+002,3.82799999998e+001,"Canon City","Coaldale","40Ar/39Ar","Biotite",1398.000000,"5","1398","Shaw and others (2005)","Total gas age.  Continuously climbing spectrum.  Maximum age 1460 Ma.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Hayden Pass","SC97-5A",-1.05890000000e+002,3.82900000003e+001,"Canon City","Bushnell Peak","40Ar/39Ar","Hornblende",1454.000000,"4","1454","Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Unknown","SC97-6A",-1.06110000000e+002,3.84500000004e+001,"Saguache","Poncha Pass","40Ar/39Ar","Hornblende",1668.000000,"2","1668","Shaw and others (2005)","Total gas age.  Erratic spectrum and declining spectrum.aningless age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Unknown","SC97-6B",-1.06110000000e+002,3.84500000004e+001,"Saguache","Poncha Pass","40Ar/39Ar","Muscovite",1369.000000,"2","1369","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Poncha Pass","SC97-7A",-1.06090000000e+002,3.84899999997e+001,"Saguache","Poncha Pass","40Ar/39Ar","Hornblende",1514.000000,"7","1514","Shaw and others (2005)","Total gas age.  Constantly declining spectrum. Meaninless age.  Used decay constant of Kwon and others (2002)."]
["Unnamed","Salida area","SC97-8A",-1.05980000000e+002,3.86299999997e+001,"Pikes Peak","Cameron Mountain","40Ar/39Ar","Muscovite",1360.000000,"9","1350","Shaw and others (2005)","Total gas age.  Concave upward spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Unnamed","Salida area","SC97-8B",-1.05980000000e+002,3.86299999997e+001,"Pikes Peak","Cameron Mountain","40Ar/39Ar","Biotite",832.000000,"1","832","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Metavolcanics rocks","Salida area","SC97-9",-1.05990000000e+002,3.85900000004e+001,"Pikes Peak","Salida East","40Ar/39Ar","Actinolite",1345.000000,"11","1453","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Granite","Fourmile pluton","T-IL-10b",-1.05448487839e+002,3.86211980301e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1361.000000,"2","1361","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Crampton Mountain pluton","T-IL-1b",-1.05440000000e+002,3.85599999997e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1331.000000,"4","1349","Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaninless age.  Used decay constant of Kwon and others (2002)."]
["Granite","Crampton Mountain pluton","T-IL-3b",-1.05430000000e+002,3.85599999997e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1355.000000,"2","1355","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Crampton Mountain pluton","T-IL-4b",-1.05430000000e+002,3.85599999997e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1346.000000,"2","1346","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","Crampton Mountain pluton","T-IL-5b",-1.05420000000e+002,3.85599999997e+001,"Pikes Peak","Gribble Mountain","40Ar/39Ar","Biotite",1384.000000,"2","1384","Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Quartz monzonite","St. Vrain pluton","BL-2",-1.05582891393e+002,4.00981589759e+001,"Denver West","Ward","40Ar/39Ar","K-feldspar",72.000000,"3",null,"Lester (1992)","Approximate location."]
["Quartz monzonite","St. Vrain pluton","LI-2",-1.05572585107e+002,4.00988228194e+001,"Denver West","Ward","40Ar/39Ar","Orthoclase",73.000000,"3",null,"Lester (1992)","Approximate location."]
["Quartz monzonite","St. Vrain pluton","LI-3",-1.05562793927e+002,4.01019541040e+001,"Denver West","Ward","40Ar/39Ar","Microcline",110.000000,"3",null,"Lester (1992)","Approximate location."]
["Quartz monzonite","St. Vrain pluton","BL-17",-1.05552848122e+002,4.01064791175e+001,"Denver West","Ward","40Ar/39Ar","Microcline",125.000000,"3",null,"Lester (1992)","Approximate location."]
["Lamprophyre dike","Carlton Tunnel, Cripple Creek",null,-1.05142171152e+002,3.87164690259e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","not given",33.700000,"0.4",null,"Jensen (2003)","Laser fusion? on unknown mineral."]
["Glomeroporphyritic phonolite","Altman Pit, Cripple Creek",null,-1.05140534129e+002,3.87275874584e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Biotite",32.700000,"0.7",null,"Helms (2000)","Laser Fusion."]
["N-2 dike in Altman Pit","Altman Pit, Cripple Creek",null,-1.05132920629e+002,3.87366214746e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","not given",31.900000,"1.7",null,"Jensen (2003)","Laser fusion? on unknown mineral."]
["Biotite in vein","Vindicator Mine, Cripple Creek",null,-1.05128052601e+002,3.87275625526e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Biotite",33.000000,"0.4",null,"Jensen (2003)","Laser Fusion."]
["Bull Cliffs Phonolite","Cripple Creek, east",null,-1.05126521967e+002,3.87351636206e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Sanidind",33.200000,"0.1",null,"Helms (2000)","Laser Fusion."]
["Bull Cliffs phonolite","Cripple Creek, east",null,-1.05125747670e+002,3.87333598090e+001,"Pikes Peak","Cripple Creek South","40Ar/39Ar","Hornblende",32.000000,"0.5",null,"Helms (2000)","Laser Fusion."]
["Kimberlite","George Creek Kimberlite dike",null,-1.05702672000e+002,4.08918860002e+001,"Fort Collins","Eaton Reservoir","Rb-Sr","Whole-rock",600.000000,"Not report",null,"Carlson and Marsh (1986)","Approximate age of weathered material."]
["Kimberlite","Chicken Park Kimberlite",null,-1.05538225000e+002,4.08642329999e+001,"Fort Collins","Diamond Peak","U-Pb","Perovskite",614.000000,"2",null,"Heaman and others (2003)","Weighted average of four size fractions."]
["Minette","Dike east of Walsenburg","SP70",-1.04622120000e+002,3.76902679998e+001,"Trinidad","Cucharas Reservoir","40Ar/39Ar","Biotite",14.300000,"0.1","14.3","Penn and Lindsey (2009)","Partial plateau."]
["Camptonite","East-trending parallel swarm, south of Spanish Peaks","SP37",-1.04928629000e+002,3.72614649997e+001,"Trinidad","Herlick Canyon","40Ar/39Ar","Biotite",26.600000,"0.12","26.6","Penn and Lindsey (2009)","Plateau age."]
["Hornblende monzonite","Bradford Mesa","SP51",-1.04730029000e+002,3.77300000003e+001,"Trinidad","Maria Reservoir","40Ar/39Ar","Biotite",21.500000,"0.05","21.5","Penn and Lindsey (2009)","Aproximate location. Plateau age."]
["Quartz Monzonite","West Spanish Peak stock","SP33",-1.04982662000e+002,3.73798610002e+001,"Trinidad","Spanish Peaks","40Ar/39Ar","Biotite",24.600000,"0.13","24.6","Penn and Lindsey (2009)","Partial plateau."]
["East Spanish Peak stock","East Spanish Peak stock","SP134",-1.04920005000e+002,3.73903239996e+001,"Trinidad","Spanish Peaks","40Ar/39Ar","Biotite",23.900000,"0.08","23.9","Penn and Lindsey (2009)","Plateau age."]
["Monzonite","Huerfano Butte","SP34-HB",-1.04826823000e+002,3.77538279997e+001,"Trinidad","Walsenburg North","40Ar/39Ar","Biotite",25.200000,"0.2","25.2","Penn and Lindsey (2009)","Partial plateau."]
["Alkali basalt","Huerfano Butte","SP34-TS",-1.04826823000e+002,3.77538279997e+001,"Trinidad","Walsenburg North","40Ar/39Ar","Biotite",25.200000,"0.25","25.2","Penn and Lindsey (2009)","Partial plateau."]
["Minette","Walsenburg","SP131",-1.04789634000e+002,3.76360069996e+001,"Trinidad","Walsenburg North","40Ar/39Ar","Biotite",21.300000,"0.25","21.3","Penn and Lindsey (2009)","Plateau age."]
["Syenite porphyry","Spanish Peaks radial dike swarm","SP73",-1.04876829000e+002,3.75005040001e+001,"Trinidad","Ritter Arroyo","40Ar/39Ar","Hornblende",22.800000,"0.13","22.8","Penn and Lindsey (2009)","Plateau age."]
["Lamproite","Lamproite body near Granby","6LT56",-1.05955116000e+002,4.01886660003e+001,"Estes Park","Trail Mountain","K/Ar","Phlogopite",33.000000,"0.08","33","Thompson and others (1997)",null]
["Quartz porphyry","Pando Porphyry","AS-12",-1.06823005218e+002,3.91402785657e+001,"Leadville","Aspen","FT","Zircon",50.000000,"7.2","50","Bryant and others (1990)",null]
["Granite","Twin Lakes pluton","73-N8",-1.06507760730e+002,3.90682211237e+001,"Leadville","Independence Pass","FT","Zircon",44.200000,"4",null,"Shannon (1988)",null]
["Granite","Twin Lakes pluton","73-N8",-1.06507760730e+002,3.90682211237e+001,"Leadville","Independence Pass","FT","Sphene",45.900000,"3.9",null,"Shannon (1988)",null]
["Quartzite","Idaho Springs area","KIS0012",-1.05347710904e+002,3.98699276594e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Muscovite",1347.000000,"2",null,"Shaw and others (2005)","Total gas age.  Erractic spectrum.  Meaningless age.  Maximum age is 1620 Ma.  Decay constant of Kwon and others (2002)."]
["Gneiss","Sherman Mountain","KIS004",-1.05748568135e+002,3.97325688899e+001,"Denver West","Georgetown","40Ar/39Ar","Hornblende",1396.000000,"10",null,"Shaw and others (2005)","Near Plateau.  Used decay constant of Kwon and others (2002)."]
["Gneiss","Sherman Mountain","KIS004",-1.05748752866e+002,3.97325676985e+001,"Denver West","Georgetown","40Ar/39Ar","Biotite",1325.000000,"1",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granodiorite (?)","Twin Spruce pluton","KIS012",-1.05379958666e+002,3.98544206953e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Biotite",1280.000000,"4",null,"Shaw and others (2005)","Near Plateau.    Used decay constant of Kwon and others (2002)."]
["Unknown","At Sherman Granite contact","CB-97-2",-1.05340000000e+002,4.09300000000e+001,"Fort Collins","Virginia Dale","40Ar/39Ar","Hornblende",1520.000000,"Not report",null,"Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Unknown","Northern Front Range","CB-97-2",-1.05340000000e+002,4.09300000000e+001,"Fort Collins","Virginia Dale","40Ar/39Ar","Biotite",1429.000000,"Not report",null,"Shaw and others (2005)","Total gas age.  Concave upward spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Unknown","Northern Front Range","CB-97-3",-1.05340000000e+002,4.09300000000e+001,"Fort Collins","Virginia Dale","40Ar/39Ar","Hornblende",1540.000000,"Not report",null,"Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99-CP-02A",-1.05764344583e+002,4.03787718681e+001,"Estes Park","Fall River Pass","40Ar/39Ar","Biotite",1281.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99-CP-02B",-1.05760966913e+002,4.03750518605e+001,"Estes Park","Fall River Pass","40Ar/39Ar","Musovite",1273.000000,"2",null,"Shaw and others (2005)","Total gas age.  Concave downward spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99-CP-02B",-1.05760966913e+002,4.03750518605e+001,"Estes Park","Fall River Pass","40Ar/39Ar","Biotite",1246.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99FF-01",-1.05716680303e+002,4.03454094856e+001,"Estes Park","McHenry's Peak","40Ar/39Ar","Biotite",1222.000000,"2",null,"Shaw and others (2005)","Total gas age.  Concave downward spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99SV-02",-1.05500000000e+002,4.01400000000e+001,"Estes Park","Allens Park","40Ar/39Ar","Biotite",1190.000000,"2",null,"Shaw and others (2005)","Total gas age.  Concave upward spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99SV-05",-1.05340000000e+002,4.01800000000e+001,"Estes Park","Lyons","40Ar/39Ar","Muscovite",1343.000000,"2",null,"Shaw and others (2005)","Total gas age.  Concave upward spectrum.  Meaningless age.   Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99SV-05",-1.05340000000e+002,4.01800000000e+001,"Estes Park","Lyons","40Ar/39Ar","Biotite",1264.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99SV-06",-1.05380000000e+002,4.01700000000e+001,"Estes Park","Raymond","40Ar/39Ar","Muscovite",1304.000000,"2",null,"Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99SV-06",-1.05380000000e+002,4.01700000000e+001,"Estes Park","Raymond","40Ar/39Ar","Biotite",1142.000000,"2",null,"Shaw and others (2005)","Total gas age.  Continuously climbing spectrum.  Meaningless age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99TS-01",-1.05543048748e+002,4.03013893953e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1298.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99TS-02",-1.05530000000e+002,4.03000000000e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1267.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99CP-01",-1.05700000000e+002,4.04400000000e+001,"Estes Park","Fall River Pass","40Ar/39Ar","Muscovite",1370.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99LP-02",-1.05620000000e+002,4.02600000000e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1236.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99LP-03",-1.05620000000e+002,4.02600000000e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1236.000000,"1",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99LP-04",-1.05610000000e+002,4.02800000000e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1222.000000,"5",null,"Shaw and others (2005)","Near plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99LP-05",-1.05590000000e+002,4.02700000000e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1188.000000,"2",null,"Shaw and others (2005)","Total gas age.  Erratic spectrum.  Meaninless age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99LP-07",-1.05600000000e+002,4.02600000000e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1226.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granite","St. Vrain pluton","99LP-01",-1.05620073692e+002,4.02604473958e+001,"Estes Park","Longs Peak","40Ar/39Ar","Biotite",1228.000000,"2",null,"Shaw and others (2005)","Plateau age.  Used decay constant of Kwon and others (2002)."]
["Granodiorite (?)","Boulder Creek pluton","ISSZR30416-2",-1.05344527594e+002,3.99389655091e+001,"Denver West","Raymond","40Ar/39Ar","Hornblende",1444.000000,"2",null,"Shaw and others (1999)","Near plateau."]
["Granodiorite (?)","Boulder Creek pluton","ISSZR30416-3",-1.05336827689e+002,4.00047592210e+001,"Denver West","Panorama Peak","40Ar/39Ar","Biotite",1360.000000,"5",null,"Shaw and others (1999)","Near plateau."]
["Granodiorite (?)","Boulder Creek pluton","ISSZR30416-2",-1.05344528683e+002,3.99391826540e+001,"Denver West","Raymond","40Ar/39Ar","Biotite",1360.000000,"5",null,"Shaw and others (1999)","Near plateau."]
["Gneiss","Idaho Springs area","ISSZR30416-4a",-1.05398621977e+002,3.98384182304e+001,"Denver West","Black Hawk","40Ar/39Ar","Biotite",1267.000000,"Not report",null,"Shaw and others (1999)","Total gas age.  Maximum age 1290 Ma."]
["Mafic metavolcanic rocks","Coal Creek Canyon","ISSZR30416-1a",-1.05284354757e+002,3.98603945765e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Hornblende",1535.000000,"Not report",null,"Shaw and others (1999)","Total gas age.  Maximum age 1520 Ma."]
["Mafic metavolcanic rocks","Coal Creek Canyon","ISSZR30326-3",-1.05294689017e+002,3.98451406549e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Hornblende",1570.000000,"Not report",null,"Shaw and others (1999)","Total gas age. Continuously climbing spectrum.  Maximum age 1560 Ma."]
["Metapelite","Coal Creek Canyon","ISSZR30326-6",-1.05287334235e+002,3.98267250002e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Muscovite",1377.000000,"2",null,"Shaw and others (1999)","Plateau age."]
["Mafic metavolcanic rocks","Golden Gate Canyon","ISSZR0706-6",-1.05260125579e+002,3.97705137014e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Hornblende",1570.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum"]
["Mafic metavolcanic rocks","Squaw Pass","ISSZR0706-1",-1.05421969349e+002,3.96724903618e+001,"Denver West","Squaw Pass","40Ar/39Ar","Hornblende",1418.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum"]
["Granite","Mount Evans pluton","ISSZR0706-2",-1.05607970948e+002,3.96207811891e+001,"Denver West","Idaho Springs","40Ar/39Ar","Biotite",1283.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum"]
["Granite","Mount Evans pluton","ISSZR0706-3",-1.05603815339e+002,3.96298985152e+001,"Denver West","Idaho Springs","40Ar/39Ar","Hornblende",1400.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum"]
["Granite","Mount Evans pluton","ISSZR0706-4",-1.05601515684e+002,3.96433590525e+001,"Denver West","Idaho Springs","40Ar/39Ar","Hornblende",1390.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum"]
["Metapelite","Coal Creek Canyon","ISSZR30326-6",-1.05287334235e+002,3.98267250002e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Biotite",1370.000000,"4",null,"Shaw and others (1999)","Near plateau."]
["Metapelite","Coal Creek Canyon","ISSZR30326-6",-1.05398621977e+002,3.98384182304e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Biotite",1380.000000,"2",null,"Shaw and others (1999)","Near plateau age."]
["Gneiss","Idaho Springs area","ISSZR30416-4a",-1.05511700000e+002,3.97408000000e+001,"Denver West","Black Hawk","40Ar/39Ar","Microcline",1366.000000,"Not report",null,"Shaw and others (1999)","Total gas age.  Maximum age 1226 Ma."]
["Granite","Mount Evans pluton","ISSZR0706-3",-1.05603480524e+002,3.96300301525e+001,"Denver West","Idaho Springs","40Ar/39Ar","Biotite",1288.000000,"2",null,"Shaw and others (1999)","Near plateau."]
["Granite","Mount Evans pluton","ISSZR0706-3",-1.05603416604e+002,3.96300996739e+001,"Denver West","Idaho Springs","40Ar/39Ar","Microcline",1140.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum."]
["Granite","Mount Evans pluton","ISSZR0706-4",-1.05601517935e+002,3.96436188351e+001,"Denver West","Idaho Springs","40Ar/39Ar","Hornblende",1410.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum."]
["Mafic metavolcanic rocks","Golden Gate Canyon","ISSZR0706-6",-1.05260125579e+002,3.97705137014e+001,"Denver West","Ralston Buttes","40Ar/39Ar","Hornblende",1571.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum."]
["Mafic metavolcanic rocks",null,"ISSZR0706-4",-1.05601516810e+002,3.96434889438e+001,"Denver West","Idaho Springs","40Ar/39Ar","Biotite",1298.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum."]
["Granite","Mount Evans pluton","ISSZR0706-4",-1.05601533765e+002,3.96435467368e+001,"Denver West","Idaho Springs","40Ar/39Ar","Microcline",1134.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum."]
["Mafic metavolcanic rocks","Idaho Springs area","ISSZR0706-5",-1.05446216945e+002,3.96942005600e+001,"Denver West","Idaho Springs","40Ar/39Ar","Hornblende",1442.000000,"Not report",null,"Shaw and others (1999)","Maximum age.  No spectrum."]
["Granite","Henry Mountain pluton",null,-1.06650367608e+002,3.85409413613e+001,"Gunnison","Parlin","U-Pb","Zircon",1540.000000,"140",null,"Aldrich and others (1958)","207/206 age."]
["Granite","Henry Mountain pluton",null,-1.06650367608e+002,3.85409413613e+001,"Gunnison","Parlin","Rb-Sr","Biotite",1300.000000,"Not report","1310","Aldrich and others (1958)",null]
["Granite","Pikes Peak pluton",null,-1.05043161654e+002,3.88398338396e+001,"Pikes Peak","Pikes Peak","Rb-Sr","Biotite",1000.000000,"Not report","1020","Aldrich and others (1958)",null]
["Granite","Pikes Peak pluton",null,-1.05043161654e+002,3.88398338396e+001,"Pikes Peak","Pikes Peak","U-Pb","Zircon",980.000000,"Not report",null,"Aldrich and others (1958)","207/206 age."]
["Basalt flow","Servilleta Basalt","FS44",-1.05402344620e+002,3.72727686904e+001,"Alamosa","Fort Garland SW","40Ar/39Ar","Whole-rock",4.550000,"0.15",null,"Miggins (2002)","Total gas age.  Sample number from Kirkham and Heimsoth (2002)."]
["Basalt flow","Servilleta Basalt","FS98",-1.05437492156e+002,3.72629056231e+001,"Alamosa","Fort Garland SW","40Ar/39Ar","Whole-rock",4.590000,"0.02",null,"Miggins (2002)","Total gas age.  Sample number from Kirkham and Heimsoth (2002)."]
["Basalt flow","Servilleta Basalt","FG1B",-1.05399118832e+002,3.73943414702e+001,"Alamosa","Fort Garland","40Ar/39Ar","Whole-rock",3.660000,"0.01",null,"Wallace (1997)","Total gas age."]
["Andesite","Martinez Hill","LV51",-1.05331941004e+002,3.71071242637e+001,"Alamosa","La Valley","40Ar/39Ar","Hornblende",12.840000,"0.18",null,"Peters (2004)","Plateau age.  Reported in Kirkham and others (2004)"]
["Andesite",null,"LV255",-1.05350825991e+002,3.70189678227e+001,"Alamosa","La Valley","40Ar/39Ar","Whole-rock",10.800000,"0.06",null,"Peters (2004)","Total gas age.  Reported in Kirkham and others (2004)"]
["Andesite",null,"LV396",-1.05365858837e+002,3.70058533995e+001,"Alamosa","La Valley","40Ar/39Ar","Hornblende",12.000000,"0.1",null,"Peters (2004)","Plateau age.  Reported in Kirkham and others (2004)"]
["Andesite",null,"LV334",-1.05256702532e+002,3.70274210907e+001,"Alamosa","La Valley","40Ar/39Ar","Whole-rock",14.800000,"0.09",null,"Peters (2004)","Total gas age.  Reported in Kirkham and others (2004)"]
["Andesite",null,"CP504A",-1.05232941864e+002,3.70353149139e+001,"Alamosa","Culebra Peak","40Ar/39Ar","Whole-rock",12.200000,"0.1",null,"Kirkham and others (2005)","Total gas age."]
["Basalt",null,"CP106",-1.05205479529e+002,3.70175119443e+001,"Alamosa","Culebra Peak","40Ar/39Ar","Whole-rock",12.020000,"0.07",null,"Kirkham and others (2005)","Total gas age."]
["Dacite",null,"CP46",-1.05137131320e+002,3.70470335120e+001,"Alamosa","Culebra Peak","40Ar/39Ar","Biotite",15.230000,"0.05",null,"Kirkham and others (2005)","Minimum age."]
["Andesite","Reinecker Ridge Volcanics","JP300",-1.05916645105e+002,3.92546892381e+001,"Bailey","Como","40Ar/39Ar","Hornblende",67.000000,"0.25",null,"Widmann and others (2005)","Unreported age type."]
["Quartz monzonite porphyry","Bald Mountain sill","CO197",-1.05894376245e+002,3.93248255606e+001,"Bailey","Como","40Ar/39Ar","Biotite",43.000000,"0.26",null,"Widmann and others (2005)","Unreported age type."]
["Rhyolite clast","Lower Conglomerate of South Park Formation","JK365",-1.05906206800e+002,3.92549185389e+001,"Bailey","Como","40Ar/39Ar","Biotite",64.000000,"0.11",null,"Widmann and others (2005)","Unreported age type."]
["Rhyolite tuff",null,"E309P",-1.05981294112e+002,3.91636511688e+001,"Bailey","Fairplay East","40Ar/39Ar","Plagioclase",32.900000,"1",null,"Kirkham and others (2006)","Mean age for 30% of gas released.  Total gas age 39.2 Ma."]
["Andesite clast","Reinecker Ridge Volcanics","JK119",-1.05905391061e+002,3.92051246656e+001,"Bailey","Fairplay East","40Ar/39Ar","Hornblende",68.800000,"0.8",null,"Kirkham and others (2006)","Complex continually declining high temperature spectrum.   Meaningless age."]
["Intermediate intrusive clast in conglomerate","Upper Conglomerate of the South Park Formation","JK099",-1.05879257827e+002,3.91356706506e+001,"Bailey","Fairplay East","40Ar/39Ar","Biotite",66.600000,"0.4",null,"Kirkham and others (2006)","Plateau age.  Cooling age"]
["Andesite clast in conglomerate","Upper Conglomerate of the South Park Formation","JK083",-1.05892572497e+002,3.91804500419e+001,"Bailey","Fairplay East","40Ar/39Ar","Biotite",66.400000,"0.4",null,"Kirkham and others (2006)","Plateau age."]
["Dacite tuff","Tuff of Triad Ridge","K0447bi",-1.05985001710e+002,3.88193241087e+001,"Pikes Peak","Castle Rock Gulch","40Ar/39Ar","Biotite",37.200000,"0.11",null,"Wallace and Keller (2003)","Plateau age."]
["Dacite tuff","Tuff of Triad Ridge","K0447hb",-1.05985065164e+002,3.88193235736e+001,"Pikes Peak","Castle Rock Gulch","40Ar/39Ar","Hornblende",38.000000,"0.3",null,"Wallace and Keller (2003)","Plateau age."]
["Granite",null,"94SPRO7",-1.05746900000e+002,3.94683000000e+001,"Bailey","Mount Logan","FT","Apatite",71.500000,"6.9","71.5","Kelley and Chapin (2004)","Laramide annealing  zone(?)."]
["Granite",null,"94SPR08",-1.05678300000e+002,3.94619000000e+001,"Bailey","Mount Logan","FT","Apatite",57.600000,"4.1","57.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"96SPR44",-1.05630800000e+002,3.94956000000e+001,"Bailey","Mount Logan","FT","Apatite",135.000000,"12.7","134.7","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granitic gneiss",null,"96SPR48",-1.05692800000e+002,3.94828000000e+001,"Bailey","Mount Logan","FT","Apatite",66.000000,"4.5","66","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"00BenTy01",-1.05590800000e+002,3.94361000000e+001,"Bailey","Shawnee","FT","Apatite",78.900000,"5.6","78.9","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"00BenTy03",-1.05656100000e+002,3.94133000000e+001,"Bailey","Mount Logan","FT","Apatite",104.000000,"7.6","104.5","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Quartz monzonite",null,"00BenTy04",-1.05680300000e+002,3.94156000000e+001,"Bailey","Mount Logan","FT","Apatite",116.000000,"8.4","115.9","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss",null,"00BenTy05",-1.05640600000e+002,3.94156000000e+001,"Bailey","Mount Logan","FT","Apatite",55.100000,"11.2","55.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"94SPR10",-1.05518600000e+002,3.94144000000e+001,"Bailey","Shawnee","FT","Apatite",60.500000,"6.8","60.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"94SPR11",-1.05445300000e+002,3.93833000000e+001,"Bailey","Bailey","FT","Apatite",116.000000,"9.3","115.7","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Diorite",null,"94SPR12",-1.05472200000e+002,3.94061000000e+001,"Bailey","Bailey","FT","Apatite",59.600000,"7.7","59.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"94SPR13",-1.05466400000e+002,3.94239000000e+001,"Bailey","Bailey","FT","Apatite",117.000000,"12.8","117.1","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss",null,"96SPR38",-1.05125600000e+002,3.94264000000e+001,"Bailey","Platte Canyon","FT","Apatite",69.200000,"11.8","69.2","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"94SPR14",-1.05240600000e+002,3.94689000000e+001,"Bailey","Platte Canyon","FT","Apatite",65.900000,"5.7","65.9","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"94SPR15",-1.05226400000e+002,3.94389000000e+001,"Bailey","Platte Canyon","FT","Apatite",114.000000,"7.6","114.1","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Amphibolite",null,"94SPR16",-1.05164200000e+002,3.94108000000e+001,"Bailey","Platte Canyon","FT","Apatite",51.000000,"5.6","51","Kelley and Chapin (2004)","Laramide annealing zone."]
["Sandstone dike float",null,"97SPR37",-1.05118600000e+002,3.94336000000e+001,"Bailey","Kassler","FT","Apatite",69.500000,"5.3","69.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"96SPR39",-1.05121900000e+002,3.94283000000e+001,"Bailey","Kassler","FT","Apatite",70.600000,"5.2","70.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"96SPR40",-1.05121100000e+002,3.94256000000e+001,"Bailey","Kassler","FT","Apatite",70.800000,"9.3","70.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"96SPR42",-1.05118100000e+002,3.94286000000e+001,"Bailey","Kassler","FT","Apatite",74.200000,"4.8","74.2","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granodiorite",null,"94SPR17",-1.05107500000e+002,3.94853000000e+001,"Bailey","Kassler","FT","Apatite",194.000000,"12.7","194.4","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss",null,"94SPR19",-1.05123600000e+002,3.94389000000e+001,"Bailey","Kassler","FT","Apatite",47.100000,"6.4","47.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94SPR20",-1.05121700000e+002,3.94461000000e+001,"Bailey","Kassler","FT","Apatite",65.200000,"4.5","65.2","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"94SRP21",-1.05129400000e+002,3.94775000000e+001,"Bailey","Platte Canyon","FT","Apatite",64.400000,"4.1","64.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"95SPR22",-1.05473100000e+002,3.94133000000e+001,"Bailey","Bailey","FT","Apatite",123.000000,"10.1","122.8","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granite",null,"95SPR23B",-1.05471900000e+002,3.94189000000e+001,"Bailey","Bailey","FT","Apatite",152.000000,"16.1","151.9","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granite",null,"95SPR24",-1.05546400000e+002,3.93692000000e+001,"Bailey","Topaz Mountain","FT","Apatite",156.000000,"11","155.8","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granodiorite",null,"95SPR25",-1.05542800000e+002,3.93683000000e+001,"Bailey","Topaz Mountain","FT","Apatite",131.000000,"9.4","130.9","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granitic gneiss",null,"95SPR26",-1.05530600000e+002,3.93936000000e+001,"Bailey","Shawnee","FT","Apatite",150.000000,"8.4","149.9","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granitic gneiss",null,"95SPR27",-1.05520600000e+002,3.93972000000e+001,"Bailey","Shawnee","FT","Apatite",120.000000,"10.7","119.6","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granite",null,"95SPR29",-1.05118100000e+002,3.94497000000e+001,"Bailey","Kassler","FT","Apatite",112.000000,"7.7","111.9","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granitic gneiss",null,"95SPR30",-1.05118600000e+002,3.94506000000e+001,"Bailey","Kassler","FT","Apatite",119.000000,"8.8","118.9","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granite",null,"95SPR31",-1.05146100000e+002,3.94769000000e+001,"Bailey","Platte Canyon","FT","Apatite",76.800000,"6","76.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"95SPR32",-1.05140600000e+002,3.94750000000e+001,"Bailey","Platte Canyon","FT","Apatite",79.800000,"5.8","79.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"95SPR33",-1.05134400000e+002,3.94719000000e+001,"Bailey","Platte Canyon","FT","Apatite",66.100000,"6.2","66.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"95SPR34",-1.05126900000e+002,3.94794000000e+001,"Bailey","Platte Canyon","FT","Apatite",93.400000,"8.8","93.4","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss and schist",null,"95SPR35",-1.05119200000e+002,3.94833000000e+001,"Bailey","Kassler","FT","Apatite",120.000000,"12.2","119.6","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Monzonite",null,"94TAR01",-1.05627200000e+002,3.92225000000e+001,"Bailey","Eagle Rock","FT","Apatite",74.900000,"9.3","74.9","Kelley and Chapin (2004)","Laramide annealing zone."]
["Monzonite",null,"94TAR02",-1.05604200000e+002,3.92358000000e+001,"Bailey","Farnum Peak","FT","Apatite",78.400000,"4.9","78.4","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Pyroxene amphibolite",null,"501",-1.05905800000e+002,3.94594000000e+001,"Bailey","Boreas Pass","FT","Apatite",79.000000,"38","79","Bryant and Naeser (1980)","Laramide annealing zone."]
["Muscovite-biotite monzogranite",null,"A-1",-1.05758900000e+002,3.94136000000e+001,"Bailey","Jefferson","FT","Apatite",49.800000,"4","49.8","Bryant and Naeser (1980)","Laramide annealing zone."]
["Muscovite-biotite monzogranite",null,"A-2",-1.05758300000e+002,3.93228000000e+001,"Bailey","Milligan Lakes","FT","Apatite",148.000000,"19","148","Bryant and Naeser (1980)","Laramide partial annealing zone."]
["Muscovite-biotite monzogranite",null,"A-3",-1.05752800000e+002,3.93069000000e+001,"Bailey","Milligan Lakes","FT","Apatite",124.000000,"18","124","Bryant and Naeser (1980)","Laramide partial annealing zone."]
["Muscovite-biotite monzogranite",null,"A-4",-1.05708300000e+002,3.92972000000e+001,"Bailey","Observatory Rock","FT","Apatite",130.000000,"25","130","Bryant and Naeser (1980)","Laramide partial annealing zone."]
["Muscovite-biotite monzogranite",null,"A-5",-1.05768100000e+002,3.93092000000e+001,"Bailey","Milligan Lakes","FT","Apatite",245.000000,"30","245","Bryant and Naeser (1980)","Laramide (and/or Late Paleozoic) partial annealing zone."]
["Biotite-muscovite monzogranite",null,"A-7",-1.05797800000e+002,3.91861000000e+001,"Bailey","Elkhorn","FT","Apatite",473.000000,"100","473","Bryant and Naeser (1980)","Laramide partial annealing zone."]
["Muscovite-biotite granite",null,"A-9",-1.05718100000e+002,3.90914000000e+001,"Bailey","Sulphur Mountain","FT","Apatite",352.000000,"18","352","Bryant and Naeser (1980)","Laramide partial annealing zone."]
["Porphyritic biotite granodiorite","Bald Mountain sill","233",-1.05936700000e+002,3.93603000000e+001,"Bailey","Como","FT","Apatite",41.100000,"10","41.1","Bryant and others (1981)","South end of sill."]
["Porphyritic biotite granodiorite","Bald Mountain sill","233",-1.05936700000e+002,3.93603000000e+001,"Bailey","Como","FT","Sphene",39.900000,"2","39.9","Bryant and others (1981)","South end of sill."]
["Porphyritic hornblende-biotite monzogranite","Bald Mountain sill","503",-1.05926900000e+002,3.93444000000e+001,"Bailey","Como","FT","Apatite",40.600000,"5.8","40.6","Bryant and others (1981)","South end of sill."]
["Porphyritic Hornblende-biotite trachydacite","Sill in Benton Group","328",-1.05834400000e+002,3.94219000000e+001,"Bailey","Jefferson","FT","Apatite",56.400000,"7.4","56.4","Bryant and others (1981)","2% rock fragments and impurties.  Has many defects.  Age only approximate."]
["Dacite flow breccia","Underlies Wall Mountain Tuff","430a",-1.05898600000e+002,3.90133000000e+001,"Bailey","Garo","FT","Apatite",42.800000,"5.1","42.8","Bryant and others (1981)",null]
["Hornblende-biotite-plagioclase-quartz crystal tuff","South Park Formation","W-1-75",-1.05808600000e+002,3.92303000000e+001,"Bailey","Elkhorn","FT","Apatite",66.500000,"11.6","66.5","Bryant and others (1981)","About 1600 m above base."]
["Hornblende-biotite-plagioclase-quartz crystal tuff","Link Springs Tuff Member of the South Park Formation","150",-1.05825600000e+002,3.92575000000e+001,"Bailey","Milligan Lakes","FT","Apatite",66.400000,"12","66.4","Bryant and others (1981)",null]
["Dacite flow","South Park formation","325",-1.05852800000e+002,3.92975000000e+001,"Bailey","Milligan Lakes","FT","Apatite",63.300000,"8.5","63.3","Bryant and others (1981)","About 160 m above base."]
["Pyroxene-hornblende trachydacite",null,"SB-1",-1.05222200000e+002,3.90583000000e+001,"Bailey","Signal Butte","FT","Sphene",43.300000,"3.9","43.3","Marvin and others (1974) [#208]","Plug rises 150 m above well developed erosion surface."]
["Tuffaceous sands","Antero Formation","1315",-1.05717700000e+002,3.91258000000e+001,"Bailey","Eagle Rock","40Ar/39Ar","Sanidine",33.800000,"0.12","33.76","McIntosh and Chapin (2004)","Samples #65 and 66 (sample nos. 1315 and 1318) and six others from the Antero Fomation give a rounded age of 33.9 (McIntosh and Chapin, 2004)."]
["Pumaceous sandstone","Antero Formation","1318",-1.05685800000e+002,3.91002000000e+001,"Bailey","Sulfur Mountain","40Ar/39Ar","Sanidine",33.800000,"0.09","33.78","McIntosh and Chapin (2004)","Samples #65 and 66 (sample nos. 1315 and 1318) and six others from the Antero Fomation give a rounded age of 33.9 (McIntosh and Chapin, 2004)."]
["Fayalite-quartz syenite","Pikes Peak batholith","B65D",-1.05173100000e+002,3.91914000000e+001,"Bailey","Westcreek","U-Pb","Zircon",1086.000000,"2.5","1085.6","Smith and others (1999)",null]
["Quartz-fayalite syenite","Pikes Peak batholith",null,-1.05173100000e+002,3.91914000000e+001,"Bailey","Westcreek","U-Pb","Zircon",1093.000000,"20","1093","Schaerer and Allegre (1982)","Based on 12 fragments of a single grain."]
["Granite","Silver Plume Granite","LP-4",-1.05901400000e+002,3.97244000000e+001,"Denver West","Loveland Pass","FT","Apatite",19.000000,"7.9","19","Naeser and others (2002)","Annealing age."]
["Amphibolite",null,"LP-2",-1.05893900000e+002,3.97253000000e+001,"Denver West","Loveland Pass","FT","Apatite",19.500000,"3.3","19.5","Naeser and others (2002)","Annealing age."]
["Granite","Silver Plume Granite","GP-2",-1.05843900000e+002,3.97231000000e+001,"Denver West","Grays Peak","FT","Apatite",21.700000,"4.5","21.7","Naeser and others (2002)","Annealing age."]
["Granite","Silver Plume Granite","GP-7",-1.05792500000e+002,3.97175000000e+001,"Denver West","Grays Peak","FT","Apatite",21.800000,"5.8","21.8","Naeser and others (2002)","Annealing age."]
["Granite","Silver Plume Granite","GP-3",-1.05850600000e+002,3.97039000000e+001,"Denver West","Grays Peak","FT","Apatite",23.400000,"6.2","23.4","Naeser and others (2002)","Annealing age."]
["Granite","Silver Plume Granite","GP-1",-1.05830600000e+002,3.97111000000e+001,"Denver West","Grays Peak","FT","Apatite",25.900000,"6.3","25.9","Naeser and others (2002)","Annealing age."]
["Amphibolite",null,"LP-7",-1.05911100000e+002,3.97181000000e+001,"Denver West","Loveland Pass","FT","Apatite",32.300000,"5.8","32.3","Naeser and others (2002)","Annealing age."]
["Granite","Silver Plume Granite","GP-6",-1.05828900000e+002,3.97183000000e+001,"Denver West","Grays Peak","FT","Apatite",34.300000,"5.5","34.3","Naeser and others (2002)","Tertiary partial annealing (?}."]
["Granite","Silver Plume Granite","GP-4",-1.05821900000e+002,3.97186000000e+001,"Denver West","Grays Peak","FT","Apatite",43.400000,"14.3","43.4","Naeser and others (2002)","Tertiary partial annealing."]
["Granite","Silver Plume Granite","GP-5",-1.05826400000e+002,3.97206000000e+001,"Denver West","Grays Peak","FT","Apatite",48.300000,"6.8","48.3","Naeser and others (2002)","Tertiary partial annealing."]
["Gneiss",null,"00GP02",-1.05811100000e+002,3.96358000000e+001,"Denver West","Grays Peak","FT","Apatite",43.000000,"3.7","43","Kelley and Chapin (2004)","Annealing age."]
["Biotite-quartz-feldspar gneiss",null,"MS-1",-1.05932800000e+002,3.95017000000e+001,"Denver West","Keystone","FT","Apatite",45.100000,"5.9","45.1","Bryant and Naeser (1980)","Annealing age."]
["Biotite monzogranite gneiss",null,"334",-1.05430600000e+002,3.96128000000e+001,"Denver West","Meridian Hill","FT","Apatite",68.500000,"5","68.5","Bryant and Naeser (1980); Naeser and others (2002)","Laramide annealing zone."]
["Hornblende-biotite granodiorite gneiss",null,"337",-1.05521900000e+002,3.96364000000e+001,"Denver West","Idaho Springs","FT","Apatite",66.500000,"4","66.5","Bryant and Naeser (1980); Naeser and others (2002)","Laramide annealing zone."]
["Granodiorite gneiss",null,"338",-1.05550300000e+002,3.96339000000e+001,"Denver West","Idaho Springs","FT","Apatite",57.800000,"8.7","57.8","Bryant and Naeser (1980); Naeser and others (2002)","Laramide annealing zone."]
["Granodiorite gneiss",null,"345",-1.05630600000e+002,3.95800000000e+001,"Denver West","Mount Evans","FT","Apatite",90.200000,"12.7","90.2","Bryant and Naeser (1980); Naeser and others (2002)","Laramide partial annealing zone."]
["Biotite monzogranite gneiss",null,"341",-1.05641700000e+002,3.95711000000e+001,"Denver West","Mount Evans","FT","Apatite",134.000000,"7","134","Bryant and Naeser (1980); Naeser and others (2002)","Laramide partial annealing zone."]
["Gneiss",null,"94CC02",-1.05436100000e+002,3.97464000000e+001,"Denver West","Squaw Pass","FT","Apatite",47.700000,"6.5","47.7","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94CC04",-1.05406400000e+002,3.97431000000e+001,"Denver West","Squaw Pass","FT","Apatite",52.400000,"5.8","52.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"95CC12",-1.05367200000e+002,3.97344000000e+001,"Denver West","Evergreen","FT","Apatite",53.300000,"3.9","53.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"96COCO1",-1.05270600000e+002,3.98789000000e+001,"Denver West","Eldorado Springs","FT","Apatite",58.100000,"7.1","58.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Metarhyolite",null,"96COCO2",-1.05273100000e+002,3.98794000000e+001,"Denver West","Eldorado Springs","FT","Apatite",50.800000,"5.2","50.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"97VBO1",-1.05258600000e+002,3.98039000000e+001,"Denver West","Ralston  Buttes","FT","Apatite",59.300000,"4.9","59.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"97VB02",-1.05258300000e+002,3.98019000000e+001,"Denver West","Ralston Buttes","FT","Apatite",48.800000,"6.9","48.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"97VB03",-1.05284400000e+002,3.98219000000e+001,"Denver West","Ralston Buttes","FT","Apatite",63.100000,"7.1","63.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"97VB04",-1.05290600000e+002,3.98147000000e+001,"Denver West","Ralston Buttes","FT","Apatite",67.300000,"4.8","67.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"97VB05",-1.05328300000e+002,3.98333000000e+001,"Denver West","Ralston Buttes","FT","Apatite",52.800000,"5.9","52.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"97VB06",-1.05354400000e+002,3.98472000000e+001,"Denver West","Ralston Buttes","FT","Apatite",52.600000,"4.1","52.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Monzonite",null,"97VB07",-1.05401100000e+002,3.98261000000e+001,"Denver West","Blackhawk","FT","Apatite",67.800000,"4.6","67.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Monzonite",null,"97VB08",-1.05397200000e+002,3.98272000000e+001,"Denver West","Blackhawk","FT","Apatite",74.700000,"5.2","74.7","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"95CC09",-1.05358600000e+002,3.97519000000e+001,"Denver West","Ralston Buttes","FT","Apatite",54.000000,"4.3","54","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94CC03",-1.05438100000e+002,3.97461000000e+001,"Denver West","Squaw Pass","FT","Apatite",55.600000,"5.9","55.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"95CC10",-1.05361100000e+002,3.97481000000e+001,"Denver West","Evergreen","FT","Apatite",57.200000,"6","57.2","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"95CC07",-1.05293300000e+002,3.97422000000e+001,"Denver West","Evergreen","FT","Apatite",59.700000,"4","59.7","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic lens in amphibolite",null,"95GGC01",-1.05355300000e+002,3.97853000000e+001,"Denver West","Ralston Buttes","FT","Apatite",60.100000,"4.1","60.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"95GGC02",-1.05330000000e+002,3.97844000000e+001,"Denver West","Ralston Buttes","FT","Apatite",62.500000,"4.2","62.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Phyllite/schist",null,"96GGC03",-1.05242200000e+002,3.97847000000e+001,"Denver West","Golden","FT","Apatite",143.000000,"10.2","142.8","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granitic gneiss",null,"95CC08",-1.05284700000e+002,3.97386000000e+001,"Denver West","Evergreen","FT","Apatite",61.000000,"4.9","61","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94CC05",-1.05327800000e+002,3.97414000000e+001,"Denver West","Evergreen","FT","Apatite",62.300000,"4.6","62.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"95GG02",-1.05330000000e+002,3.97844000000e+001,"Denver West","Ralston Buttes","FT","Apatite",62.500000,"4.2","62.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"95CC11",-1.05367200000e+002,3.97436000000e+001,"Denver West","Evergreen","FT","Apatite",66.800000,"5.8","66.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"96CC13",-1.05281100000e+002,3.97464000000e+001,"Denver West","Evergreen","FT","Apatite",61.800000,"4.5","61.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"96CC14",-1.05282200000e+002,3.97453000000e+001,"Denver West","Evergreen","FT","Apatite",56.000000,"3.8","56","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"96CC15",-1.05282200000e+002,3.97431000000e+001,"Denver West","Evergreen","FT","Apatite",63.100000,"5.8","63.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"96CC16",-1.05282800000e+002,3.97428000000e+001,"Denver West","Evergreen","FT","Apatite",59.400000,"4.8","59.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Migmatitic gneiss",null,"94CC01",-1.05250300000e+002,3.97475000000e+001,"Denver West","Evergreen","FT","Apatite",98.900000,"7","98.9","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss",null,"92GO02",-1.05238900000e+002,3.97494000000e+001,"Denver West","Morrison","FT","Apatite",101.000000,"5.6","100.8","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granitic gneiss",null,"96CC06",-1.05236900000e+002,3.97542000000e+001,"Denver West","Golden","FT","Apatite",116.000000,"19.4","115.7","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss",null,"92GO01",-1.05241900000e+002,3.97539000000e+001,"Denver West","Golden","FT","Apatite",150.000000,"19","149.7","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss",null,"92GO03",-1.05243900000e+002,3.97472000000e+001,"Denver West","Morrison","FT","Apatite",196.000000,"13.2","196","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Gneiss",null,"92GO04",-1.05241400000e+002,3.97439000000e+001,"Denver West","Morrison","FT","Apatite",263.000000,"17.6","263","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granite and biotite schist",null,"99DC04",-1.05160000000e+002,3.95461000000e+001,"Denver West","Indian Hills","FT","Apatite",233.000000,"13.3","233.1","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granite",null,"99DC05",-1.05168900000e+002,3.95442000000e+001,"Denver West","Indian Hills","FT","Apatite",135.000000,"15.6","135","Kelley and Chapin (2004)","Laramide partial annealing zone."]
["Granitic gneiss",null,"96SPR45",-1.05660000000e+002,3.95158000000e+001,"Denver West","Mount Evans","FT","Apatite",71.700000,"5","71.7","Kelley and Chapin (2004)","Laramide annealing zone."]
["Biotite Gneiss",null,"96SPR47B",-1.05683300000e+002,3.95019000000e+001,"Denver West","Mount Evans","FT","Apatite",58.500000,"4.1","58.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Pegmatite",null,"FT-01",-1.05266700000e+002,3.98333000000e+001,"Denver West","Ralston Buttes","FT","Apatite",63.900000,"9","63.9","Marvin and Dobson (1979)","Laramide annealing zone."]
["Gneiss",null,"FT-02",-1.05262500000e+002,3.97667000000e+001,"Denver West","Ralston Buttes","FT","Apatite",109.000000,"12","109","Marvin and Dobson (1979)","Laramide partial annealing zone."]
["Quartzite","Quartzite of Coal Creek","84-CA-4",-1.05330300000e+002,3.98903000000e+001,"Denver West","Eldorado Springs","U-Pb","Zircon (detrital)",0.000000,"Not report","1800-1880","Aleinikoff, Reed, and Wooden (1993)","U-Pb zircon ranges from 1800-1880 Ma.  Estimated provenance ages.  Probable multiple lead loss in three fractions of 1800-1880 Ma zircon."]
["Quartzite","Quartzite of Coal Creek","84-CA-4",-1.05330300000e+002,3.98903000000e+001,"Denver West","Eldorado Springs","207Pb/206Pb","Zircon",1786.000000,"Not report","1786","Aleinikoff, Reed, and Wooden (1993)","Rounded pale pink zircons."]
["Quartzite","Quartzite of Coal Creek","84-CA-4",-1.05330300000e+002,3.98903000000e+001,"Denver West","Eldorado Springs","207Pb/206Pb","Zircon",1724.000000,"Not report","1724","Aleinikoff, Reed, and Wooden (1993)","Euhedral pale pink zircons."]
["Quartzite","Quartzite of Coal Creek","84-CA-4",-1.05330300000e+002,3.98903000000e+001,"Denver West","Eldorado Springs","207Pb/206Pb","Zircon",1536.000000,"Not report","1536","Aleinikoff, Reed, and Wooden (1993)","Dark magnetic zircons."]
["Quartz monzonite","Boulder Creek quartz monzonite","83-02",-1.05349400000e+002,3.99433000000e+001,"Denver West","Eldorado Springs","U-Pb","Zircon",1672.000000,"8","1672","Premo and Van Schmus (1989)","Upper intercept on concordia diagram."]
["Quartz monzonite","Boulder Creek quartz monzonite","83-03",-1.05346700000e+002,3.99400000000e+001,"Denver West","Eldorado Springs","U-Pb","Zircon",1670.000000,"4","1670","Premo and Van Schmus (1989)","Upper intercept on concordia diagram."]
["Quartz monzonite","Boulder Creek quartz monzonite","83-02",-1.05349400000e+002,3.99433000000e+001,"Denver West","Eldorado Springs","U-Pb","Zircon",1713.000000,"10","1713","Premo and Fanning (2000)","SHRIMP age.  Upper intercept on concordia diagram."]
["Quartz monzonite","Boulder Creek quartz monzonite","83-03",-1.05346700000e+002,3.99400000000e+001,"Denver West","Eldorado Springs","U-Pb","Zircon",1721.000000,"15","1721","Premo and Fanning (2000)","SHRIMP age.  Upper intercept on concordia diagram.  This sample from the Henderson mine area."]
["Monzogranite","Mount Evans pluton","A509182",-1.05625000000e+002,3.96081000000e+001,"Denver West","Mount Evans","U-Pb","Zircon",1442.000000,"1.1","1442","Aleinikoff, Reed, and DeWitt (1993)",null]
["Granite","Granite of Rosalie Peak","A509181",-1.05630300000e+002,3.95725000000e+001,"Denver West","Mount Evans","U-Pb","Zircon",1448.000000,"9","1448","Aleinikoff, Reed, and DeWitt (1993)",null]
["Mafic inclusion in Mt. Evans batholith",null,"R0706-4",-1.05608100000e+002,3.96053000000e+001,"Denver West","Harris Park","40Ar/39Ar","Hornblende",1390.000000,"3","1390","Shaw and others (1999)","Location, rock type, and some comments are from an unpublished compilation by J.C. Reed, Jr.; hornblende megacryst"]
["Mafic inclusion in Mt. Evans batholith",null,"R0706-4",-1.05608100000e+002,3.96053000000e+001,"Denver West","Harris Park","40Ar/39Ar","Hornblende",1410.000000,"3","1410","Shaw and others (1999)","Location, rock type, and some comments are from an unpublished compilation by J.C. Reed, Jr."]
["Mafic inclusion in Mt. Evans batholith",null,"R0706-4",-1.05608100000e+002,3.96053000000e+001,"Denver West","Harris Park","40Ar/39Ar","Biotite",1298.000000,"1.5","1298","Shaw and others (1999)","Location, rock type, and some comments are from an unpublished compilation by J.C. Reed, Jr."]
["Amphibolite layer",null,"R0706-1",-1.05424400000e+002,3.96900000000e+001,"Denver West","Squaw Pass","40Ar/39Ar","Hornblende",1418.000000,"3","1418","Shaw and others (1999)","Location, rock type, and some comments are from an unpublished compilation by J.C. Reed, Jr."]
["Amphibolite lens",null,"R0706-5",-1.05413300000e+002,3.97403000000e+001,"Denver West","Squaw Pass","40Ar/39Ar","Hornblende",1442.000000,"2","1442","Shaw and others (1999)","Location, rock type, and some comments are from an unpublished compilation by J.C. Reed, Jr."]
["Feldspar-quartz-biotite-muscovite pegmatite",null,"22500",-1.05485000000e+002,3.99508000000e+001,"Denver West","Tungsten","40Ar/39Ar","Biotite",1220.000000,"Not report","1220","Berger (1975)","Regional cooling age; coarse biotite."]
["Amphibolite included in pegmatite",null,"9400",-1.05516100000e+002,3.99556000000e+001,"Denver West","Nederland","40Ar/39Ar","Hornblende",1405.000000,"Not report","1405","Berger (1975)","Regional cooling age."]
["Kimberlite","Green Mountain diatreme","Green Mountain diatreme",-1.05301100000e+002,3.99892000000e+001,"Denver West","Eldorado Springs","Sm-Nd","Whole-rock, minerals",572.000000,"49","572","Lester and others (2001)","Isochron age."]
["Kimberlite","Green Mountain diatreme","Green Mountain diatreme",-1.05301100000e+002,3.99892000000e+001,"Denver West","Eldorado Springs","FT","Sphene",367.000000,"15","367","Larson and Amini (1981)","Emplacement age."]
["Kimberlite","Green Mountain diatreme","Green Mountain diatreme",-1.05301100000e+002,3.99892000000e+001,"Denver West","Eldorado Springs","FT","Apatite",77.100000,"5","77.1","Larson and Amini (1981)","Laramide partial (?) annealing zone."]
["Quartz monzonite","Eldora stock","EC-1",-1.05591700000e+002,3.99500000000e+001,"Denver West","Nederland","FT","Sphene",67.100000,"7.5","67.1","Marvin and others (1974) [#64]",null]
["Quartz monzonite","Eldora stock","EC-1",-1.05591700000e+002,3.99500000000e+001,"Denver West","Nederland","FT","Apatite",73.000000,"7","73","Marvin and others (1974) [#64]",null]
["Biotite-hornblende quartz monzonite","Eldora stock","E-1",-1.05587800000e+002,3.99517000000e+001,"Denver West","Nederland","FT","Apatite",58.600000,"9.4","58.6","Cunningham and others (1994)",null]
["Monzonite","Empire stock",null,-1.05719200000e+002,3.97628000000e+001,"Denver West","Empire","FT","Sphene",67.800000,"4.5","67.8","Marvin and others (1974) [#78]",null]
["Hornblende-pyroxene monzonite","Empire stock","EM-1",-1.05722200000e+002,3.97633000000e+001,"Denver West","Empire","FT","Sphene",66.000000,"6.2","66","Cunningham and others (1994), p. 3, 7, 19.",null]
["Hornblende-pyroxene monzonite","Empire stock","EM-1",-1.05722200000e+002,3.97633000000e+001,"Denver West","Empire","FT","Apatite",37.400000,"2.8","37.4","Cunningham and others (1994)",null]
["Hornblende-biotite quartz monzonite","Apex stock","A-1",-1.05555000000e+002,3.98675000000e+001,"Denver West","Central City","FT","Apatite",71.300000,"18","71.3","Cunningham and others (1994)",null]
["Hornblende-biotite quartz monzonite",null,"A-2",-1.05555000000e+002,3.98675000000e+001,"Denver West","Central City","FT","Apatite",66.800000,"7.5","66.8","Cunningham and others (1994)","Dike intruding A-1."]
["Trachybasalt",null,null,-1.05224200000e+002,3.97614000000e+001,"Denver West","Golden","40Ar/39Ar","Whole-rock",63.900000,"1.2","63.94","Obradovich (2002); unpub. report from New Mexico geochronologic research lab. to",null]
["Rhyolite tuff","Green Mountain Conglomerate",null,-1.05184400000e+002,3.97092000000e+001,"Denver West","Morrison","40Ar/39Ar","Sanidine",63.900000,"0.28","63.94","Obradovich (2002)",null]
["Granite porphyry","Red Mountain porphyry","8",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",29.900000,"0.3","29.9","Geissman and others (1992)","Distrubed spectrum, preferred age."]
["Lamprophyre",null,"9",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Biotite",29.800000,"0.1","29.81","Geissman and others (1992)","Distrubed spectrum, preferred age."]
["Rhyolite dike",null,"10",-1.05833300000e+002,3.97583000000e+001,"Denver West","Berthoud Pass","40Ar/39Ar","Orthoclase",29.400000,"0.2","29.4","Geissman and others (1992)","Distrubed spectrum, excess argon."]
["Mafic inclusion","Boulder Creek Granodiorite","ISSZR30416-3",-1.05360600000e+002,4.00044000000e+001,"Estes Park","Boulder","40Ar/39Ar","Hornblende",1430.000000,"8","1429","Shaw and others (1999)",null]
["Granodiorite",null,null,-1.05364700000e+002,4.01150000000e+001,"Estes Park","Boulder","FT","Apatite",52.900000,"8","52.9","Marvin and others (1974) [#67]","Pluton."]
["Monzonite porphyry",null,"B1382",-1.05328300000e+002,4.00950000000e+001,"Estes Park","Boulder","FT","Sphene",50.600000,"7.1","50.6","Marvin and others (1974) [#69]","Stock."]
["Mafic monzonite","Valmont dike","76CS94",-1.05190300000e+002,4.00347000000e+001,"Estes Park","Niwot","Rb-Sr","Whole-rock",64.000000,"Not report","64","Simmons and Hedge (1978)",null]
["Granodiorite","Jamestown stock","JS-3",-1.05391700000e+002,4.01111000000e+001,"Estes Park","Gold Hill","FT","Apatite",47.100000,"5.8","47.1","Cunningham and others (1994)",null]
["Bostonite","Bald Mountain stock","Bos 1",-1.05452500000e+002,4.00383000000e+001,"Estes Park","Gold Hill","40Ar/39Ar","Orthoclase",48.200000,"0.29","48.19","Kane (1988); Kane and others (1988)","Plateau age."]
["Granitic gneiss",null,"96BT01",-1.05488100000e+002,4.03736000000e+001,"Estes Park","Panorama Peak","FT","Apatite",48.700000,"6.8","48.7","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"96BT02",-1.05468600000e+002,4.03814000000e+001,"Estes Park","Glen Haven","FT","Apatite",57.900000,"6.7","57.9","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"96BT03",-1.05318600000e+002,4.04297000000e+001,"Estes Park","Drake","FT","Apatite",55.300000,"9.8","55.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"96BT04",-1.05232200000e+002,4.04225000000e+001,"Estes Park","Masonville","FT","Apatite",45.400000,"3.4","45.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite porphyry",null,"96BT05",-1.05231700000e+002,4.04306000000e+001,"Estes Park","Masonville","FT","Apatite",64.800000,"8.4","64.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Muscovite-biotite granite",null,"96BT06",-1.05354700000e+002,4.04225000000e+001,"Estes Park","Drake","FT","Apatite",62.500000,"4.7","62.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite porphyry",null,"96SV01",-1.05306400000e+002,4.02047000000e+001,"Estes Park","Lyons","FT","Apatite",47.500000,"5.2","47.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99SV02",-1.05502200000e+002,4.01414000000e+001,"Estes Park","Allens Park","FT","Apatite",57.600000,"4.7","57.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Sandstone","Fountain Formation","99SV03",-1.05276100000e+002,4.02153000000e+001,"Estes Park","Lyons","FT","Apatite",49.500000,"3.4","49.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99SV05",-1.05341700000e+002,4.01822000000e+001,"Estes Park","Lyons","FT","Apatite",53.100000,"5.8","53.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99SV06",-1.05379700000e+002,4.01714000000e+001,"Estes Park","Raymond","FT","Apatite",54.600000,"4.5","54.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99SV07",-1.05447800000e+002,4.01681000000e+001,"Estes Park","Raymond","FT","Apatite",60.200000,"9.3","60.2","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99SV08",-1.05463100000e+002,4.01692000000e+001,"Estes Park","Raymond","FT","Apatite",46.900000,"5.9","46.9","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"99TS01",-1.05522500000e+002,4.02928000000e+001,"Estes Park","Longs Peak","FT","Apatite",50.900000,"4.2","50.9","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"99TS02",-1.05531700000e+002,4.02953000000e+001,"Estes Park","Longs Peak","FT","Apatite",54.100000,"4.2","54.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99LP01",-1.05615000000e+002,4.02547000000e+001,"Estes Park","Longs Peak","FT","Apatite",51.700000,"4.3","51.7","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99LP02",-1.05618900000e+002,4.02550000000e+001,"Estes Park","Longs Peak","FT","Apatite",55.100000,"4.2","55.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99LP03",-1.05621700000e+002,4.02603000000e+001,"Estes Park","Longs Peak","FT","Apatite",45.100000,"8.5","45.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99LP04",-1.05605300000e+002,4.02747000000e+001,"Estes Park","Longs Peak","FT","Apatite",53.300000,"5.4","53.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99LP05",-1.05586400000e+002,4.02717000000e+001,"Estes Park","Longs Peak","FT","Apatite",49.200000,"5.1","49.2","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"99LP06",-1.05554700000e+002,4.02714000000e+001,"Estes Park","Longs Peak","FT","Apatite",47.300000,"4.2","47.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Pegmatite in schist",null,"99CP01",-1.05700300000e+002,4.04339000000e+001,"Estes Park","Trail Ridge","FT","Apatite",57.600000,"3.4","57.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Mica schist",null,"99CP02b",-1.05725600000e+002,4.04339000000e+001,"Estes Park","Trail Ridge","FT","Apatite",54.500000,"3.7","54.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granodiorite in granite pluton",null,"99FF01",-1.05666700000e+002,4.03478000000e+001,"Estes Park","McHenrys Peak","FT","Apatite",51.100000,"5.2","51.1","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"00IP02",-1.05673900000e+002,4.01381000000e+001,"Estes Park","Isolation Peak","FT","Apatite",41.000000,"5.4","41","Kelley and Chapin (2004)","Laramide (?) annealing zone."]
["Granitic gneiss",null,"00IP03",-1.05672200000e+002,4.01408000000e+001,"Estes Park","Isolation Peak","FT","Apatite",67.400000,"6","67.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"00IP04",-1.05668900000e+002,4.01328000000e+001,"Estes Park","Isolation Peak","FT","Apatite",58.800000,"4.3","58.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"00IP05",-1.05671900000e+002,4.01256000000e+001,"Estes Park","Isolation Peak","FT","Apatite",53.000000,"4.3","53","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite Gneiss",null,"96BCO1",-1.05301600000e+002,4.00130000000e+001,"Estes Park","Boulder","FT","Apatite",62.300000,"3.8","62.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Clinopyroxene latite porphyry","Sill in Benton Shale",null,-1.05902500000e+002,4.00488000000e+001,"Estes Park","Granby","FT","Apatite",66.000000,"4.2","66","Schroeder (1995)","Cooling age."]
["Porphyritic rhyodacite",null,"USGS(D)-73N1",-1.05518900000e+002,4.06931000000e+001,"Fort Collins","Rustic","FT","Apatite",47.500000,"5","47.5","McCallum and Naeser (1977)","Dike."]
["Porphyritic rhyodacite to quartz latite",null,"USGS(D)-73N3",-1.05589400000e+002,4.07172000000e+001,"Fort Collins","Rustic","FT","Apatite",58.000000,"5","58","McCallum and Naeser (1977)","Dike."]
["Sodic, quartz-rich dacite porphyry",null,"USGS(D)-73N4",-1.05581700000e+002,4.07264000000e+001,"Fort Collins","Rustic","FT","Apatite",58.000000,"9","58","McCallum and Naeser (1977)","Dike."]
["Porphyritic hornblende dacite",null,"USGS(D)-73N5",-1.05603100000e+002,4.07350000000e+001,"Fort Collins","Rustic","FT","Apatite",56.600000,"6","56.6","McCallum and Naeser (1977)","Dike."]
["Rhyolite breccia",null,"USGS(D)-73N6",-1.05538900000e+002,4.07242000000e+001,"Fort Collins","Rustic","FT","Apatite",36.000000,"4","36","McCallum and Naeser (1977)","Pipe."]
["Granite",null,"00LIV02",-1.05373600000e+002,4.07386000000e+001,"Fort Collins","Poudre Park","FT","Apatite",54.000000,"5.7","54","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"00LIV03",-1.05301700000e+002,4.08319000000e+001,"Fort Collins","Livermore Mountain","FT","Apatite",72.300000,"7.1","72.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granitic gneiss",null,"00LIV04",-1.05312200000e+002,4.08361000000e+001,"Fort Collins","Livermore Mountain","FT","Apatite",50.000000,"5.1","50","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite",null,"00LIV05",-1.05274700000e+002,4.09278000000e+001,"Fort Collins","Virginia Dale","FT","Apatite",51.000000,"5.3","51","Kelley and Chapin (2004)","Laramide annealing zone."]
["Biotite schist",null,"00LIV06",-1.05338900000e+002,4.09294000000e+001,"Fort Collins","Virginia Dale","FT","Apatite",81.200000,"4.6","81.2","Kelley and Chapin (2004)","Laramide annealing or partial annealing zone."]
["Schist",null,"94PR01",-1.05214700000e+002,4.06647000000e+001,"Fort Collins","Laporte","FT","Apatite",56.400000,"3.9","56.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"94PR02",-1.05248600000e+002,4.06994000000e+001,"Fort Collins","Laporte","FT","Apatite",75.800000,"4.6","75.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94PR03",-1.05255300000e+002,4.06919000000e+001,"Fort Collins","Poudre Park","FT","Apatite",57.600000,"3.9","57.6","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist/gneiss",null,"94PR04",-1.05295000000e+002,4.06883000000e+001,"Fort Collins","Poudre Park","FT","Apatite",70.500000,"5","70.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94PR05",-1.05324700000e+002,4.06897000000e+001,"Fort Collins","Poudre Park","FT","Apatite",68.700000,"5.1","68.7","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"94PR06",-1.05370600000e+002,4.06917000000e+001,"Fort Collins","Poudre Park","FT","Apatite",74.400000,"4.6","74.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Schist",null,"94PR07",-1.05428900000e+002,4.06769000000e+001,"Fort Collins","Big Narrows","FT","Apatite",61.900000,"5.1","61.9","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94PR08",-1.05437200000e+002,4.06961000000e+001,"Fort Collins","Big Narrows","FT","Apatite",63.400000,"4.9","63.4","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granite breccia",null,"94PR09",-1.05428600000e+002,4.06892000000e+001,"Fort Collins","Big Narrows","FT","Apatite",44.400000,"5.2","44.4","Kelley and Chapin (2004)","Tertiary partial annealing (?)."]
["Granodiorite",null,"94PR10",-1.05591400000e+002,4.06981000000e+001,"Fort Collins","Rustic","FT","Apatite",52.500000,"3.7","52.5","Kelley and Chapin (2004)","Laramide annealing zone."]
["Granodiorite",null,"94PR11",-1.05772500000e+002,4.06844000000e+001,"Fort Collins","Boston Peak","FT","Apatite",47.100000,"7.1","47.1","Kelley and Chapin (2004)","Tertiary partial annealing (?)."]
["Granodiorite",null,"94PR12",-1.05805600000e+002,4.06328000000e+001,"Fort Collins","Boston Peak","FT","Apatite",57.300000,"4.9","57.3","Kelley and Chapin (2004)","Laramide annealing zone."]
["Gneiss",null,"94PR13",-1.05761600000e+002,4.05561000000e+001,"Fort Collins","Chambers Lake","FT","Apatite",47.800000,"4.7","47.8","Kelley and Chapin (2004)","Laramide annealing zone."]
["Rhyolite",null,null,-1.05478821457e+002,3.76608639032e+001,"Blanca Peak","Mosca Pass","FT","Zircon",26.500000,"1","26.5","Bruce and Johnson (1991)","Location approximate.  One of many mapped felsic dikes."]
["Granite","Browns Pass pluton",null,-1.06432392088e+002,3.88793999125e+001,"Gunnison","Winfield","U-Pb","Zircon",1438.000000,"Not report","1438","Leader and Jones (2008)","Location inferred."]
["Latite","Latite of Waugh Mountain","WML-4-59",-1.05743954443e+002,3.86031776537e+001,"Pikes Peak","Waugh Mountain","K/Ar","Biotite",33.800000,"1","33.8","Campbell (1994)","Location inferred."]
["Andesite","Andesite of Waugh Mountain","WMA-1-51",-1.05653164023e+002,3.85982286393e+001,"Pikes Peak","Waugh Mountain","K/Ar","Hornblende",31.000000,"1.3","31","Campbell (1994)",null]
["Rhyolite","Gribbles Park Tuff","GPT-4-25",-1.05600465102e+002,3.82638423796e+001,"Canon City","Hillside","K/Ar","Biotite",33.600000,"0.9","33.6","Campbell (1994)",null]
["Andesite",null,"04-CO-GD1",-1.05835209877e+002,4.04705054416e+001,"Estes Park","Fall River Pass","40Ar/39Ar","Hornblende",28.500000,"0.15","28.53","Knox (2005)","Plateau age."]
["Andesite",null,"04-CO-GD3",-1.05841662919e+002,4.04673551084e+001,"Estes Park","Fall River Pass","40Ar/39Ar","Hornblende",28.900000,"0.04","28.85","Knox (2005)","Plateau age."]
["Rhyolite welded tuff",null,"04-CO-GD3",-1.05849844369e+002,4.04598056625e+001,"Estes Park","Fall River Pass","40Ar/39Ar","Sanidine",28.000000,"0.03","28.02","Knox (2005)","Isochron age."]
["Trachybasalt",null,"04-CO-IM3a",-1.05863951649e+002,4.05007218243e+001,"Fort Collins","Chambers Lake","40Ar/39Ar","Matrix",28.500000,"0.15","28.52","Knox (2005)","Isochron age."]
["Trachybasalt",null,"05-CO-JWR3",-1.05875165601e+002,4.05573081277e+001,"Fort Collins","Chambers Lake","40Ar/39Ar","Matrix",29.600000,"0.22","29.58","Knox (2005)","Isochron age."]
["Rhyolite welded tuff",null,"04-CO-RL1",-1.05997329183e+002,4.04997880382e+001,"Fort Collins","Clark Peak","40Ar/39Ar","Sanidine",28.700000,"0.03","28.74","Knox (2005)","Isochron age."]
["Rhyolite welded tuff",null,"EEL-1",-1.05776291779e+002,3.99190441931e+001,"Denver West","Fraser","40Ar/39Ar","Sanidine",27.100000,"0.06","27.09","Knox (2005)","Isochron age."]
["Rhyolite welded tuff",null,"CP05-97",-1.05990118003e+002,4.05235481968e+001,"Fort Collins","Clark Peak","40Ar/39Ar","Sanidine",28.500000,"0.02","28.52","Knox (2005)","Isochron age."]
["Rhyolite welded tuff",null,"CP05-100",-1.05986008462e+002,4.05052604880e+001,"Fort Collins","Clark Peak","40Ar/39Ar","Sanidine",28.500000,"0.08","28.46","Knox (2005)","Isochron age."]
["Rhyolite welded tuff",null,"DM05-183",-1.05810261422e+002,4.07605168876e+001,"Fort Collins","Deadman","40Ar/39Ar","Sanidine",27.700000,"0.04","27.65","Knox (2005)","Isochron age."]