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[100,null,4031,"Qu","BR003","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Black River","Sedimentary",null]
[100,null,4031,"Qu","BT004","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Bettles","Sedimentary",null]
[100,null,4031,"Qu","BV003","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Beaver","Sedimentary",null]
[100,null,4031,"Qu","CH003","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Chandalar","Sedimentary",null]
[100,null,4031,"Qu","CI006","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Circle","Sedimentary",null]
[100,null,4031,"Qu","CO003","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Coleen","Sedimentary",null]
[100,null,4031,"Qu","CS003","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Christian","Sedimentary",null]
[100,null,4031,"Qu","CY006","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Charley River","Sedimentary",null]
[100,null,4031,"Qu","FY004","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Fort Yukon","Sedimentary",null]
[100,null,4031,"Qu","LG005","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Livengood","Sedimentary",null]
[100,null,4031,"Qu","TN009","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Tanana","Sedimentary",null]
[100,null,4031,"Qu","WI005","Unconsolidated and poorly consolidated sediments, undivided","Surficial material deposited by water, wind, freeze-thaw cycles, and glaciers","Quaternary",null,null,"Wiseman","Sedimentary",null]
[640,null,4037,"Ts","BV003","Clasitc sedimentary rocks","Mudstone, coal, sandstone, and conglomerate deposited in lacustrine and fluvial environments","Tertiary","In the southern and western part of the map area:  Paleocene, Eocene, Oligocene and Miocene pollen have been recovered from several sites (Weber and others, 1994, Chapman and others, 1982, unpublished oil industry data, written commun., 2002).",null,"Beaver","Sedimentary",null]
[640,null,4037,"Ts","CI006","Clasitc sedimentary rocks","Mudstone, coal, sandstone, and conglomerate deposited in lacustrine and fluvial environments","Tertiary","In the southern and western part of the map area:  Paleocene, Eocene, Oligocene and Miocene pollen have been recovered from several sites (Weber and others, 1994, Chapman and others, 1982, unpublished oil industry data, written commun., 2002).",null,"Circle","Sedimentary",null]
[640,null,4037,"Ts","CO003","Clasitc sedimentary rocks","Mudstone, coal, sandstone, and conglomerate deposited in lacustrine and fluvial environments","Tertiary","In the southern and western part of the map area:  Paleocene, Eocene, Oligocene and Miocene pollen have been recovered from several sites (Weber and others, 1994, Chapman and others, 1982, unpublished oil industry data, written commun., 2002).",null,"Coleen","Sedimentary",null]
[640,null,4037,"Ts","LG005","Clasitc sedimentary rocks","Mudstone, coal, sandstone, and conglomerate deposited in lacustrine and fluvial environments","Tertiary","In the southern and western part of the map area:  Paleocene, Eocene, Oligocene and Miocene pollen have been recovered from several sites (Weber and others, 1994, Chapman and others, 1982, unpublished oil industry data, written commun., 2002).",null,"Livengood","Sedimentary",null]
[640,null,4037,"Ts","TN009","Clasitc sedimentary rocks","Mudstone, coal, sandstone, and conglomerate deposited in lacustrine and fluvial environments","Tertiary","In the southern and western part of the map area:  Paleocene, Eocene, Oligocene and Miocene pollen have been recovered from several sites (Weber and others, 1994, Chapman and others, 1982, unpublished oil industry data, written commun., 2002).",null,"Tanana","Sedimentary",null]
[1056,null,4030,"Tb","BR003","Basalt flows and rare cinder cones","Vesicular, massive olivine basalt flows that range from 20 to 300 m thick","Tertiary",null,"40Ar/39Ar ages range from 15.7+/-0.1 to 14.4+/-0.1 Ma (Kunk and others, 1994).","Black River","Igneous",null]
[1056,null,4030,"Tb","CH003","Basalt flows and rare cinder cones","Vesicular, massive olivine basalt flows that range from 20 to 300 m thick","Tertiary",null,"40Ar/39Ar ages range from 15.7+/-0.1 to 14.4+/-0.1 Ma (Kunk and others, 1994).","Chandalar","Igneous",null]
[1056,null,4030,"Tb","CO003","Basalt flows and rare cinder cones","Vesicular, massive olivine basalt flows that range from 20 to 300 m thick","Tertiary",null,"40Ar/39Ar ages range from 15.7+/-0.1 to 14.4+/-0.1 Ma (Kunk and others, 1994).","Coleen","Igneous",null]
[1103,null,4038,"Tv","BT004","Volcanic rocks","Locally thick packages that include basalt, andesite, dacite, and rhyolite flows and domes","Tertiary",null,"West side of the Ruby geanticline:  Hornblende and biotite K/Ar ages from exposures near the bottom of the sequence yielded ages of 59.5 +/- 1.7 and 59.6 +/- 1.8 Ma respectively (Patton and Miller, 1973); a flow in an uncertain position in the sequence y","Bettles","Igneous",null]
[1103,null,4038,"Tv","BV003","Volcanic rocks","Locally thick packages that include basalt, andesite, dacite, and rhyolite flows and domes","Tertiary",null,"West side of the Ruby geanticline:  Hornblende and biotite K/Ar ages from exposures near the bottom of the sequence yielded ages of 59.5 +/- 1.7 and 59.6 +/- 1.8 Ma respectively (Patton and Miller, 1973); a flow in an uncertain position in the sequence y","Beaver","Igneous",null]
[1103,null,4038,"Tv","LG005","Volcanic rocks","Locally thick packages that include basalt, andesite, dacite, and rhyolite flows and domes","Tertiary",null,"West side of the Ruby geanticline:  Hornblende and biotite K/Ar ages from exposures near the bottom of the sequence yielded ages of 59.5 +/- 1.7 and 59.6 +/- 1.8 Ma respectively (Patton and Miller, 1973); a flow in an uncertain position in the sequence y","Livengood","Igneous",null]
[1103,null,4038,"Tv","TN009","Volcanic rocks","Locally thick packages that include basalt, andesite, dacite, and rhyolite flows and domes","Tertiary",null,"West side of the Ruby geanticline:  Hornblende and biotite K/Ar ages from exposures near the bottom of the sequence yielded ages of 59.5 +/- 1.7 and 59.6 +/- 1.8 Ma respectively (Patton and Miller, 1973); a flow in an uncertain position in the sequence y","Tanana","Igneous",null]
[1320,null,4032,"Tg","CI006","Granitic rocks","Quartz monzonite, biotite granite, and alaskite","Tertiary",null,"The pluton on the Yukon River yielded a U-Pb zircon age of 60.5 +/- 0.2 Ma; the Manley pluton, on the southern boundary of the map area in the Tanana quadrangle, yielded a U-Pb zircon age of 60.9 +/- 1.0 Ma (A.B.Till, unpub. data).   40Ar/39Ar ages have","Circle","Igneous",null]
[1320,null,4032,"Tg","CY006","Granitic rocks","Quartz monzonite, biotite granite, and alaskite","Tertiary",null,"The pluton on the Yukon River yielded a U-Pb zircon age of 60.5 +/- 0.2 Ma; the Manley pluton, on the southern boundary of the map area in the Tanana quadrangle, yielded a U-Pb zircon age of 60.9 +/- 1.0 Ma (A.B.Till, unpub. data).   40Ar/39Ar ages have","Charley River","Igneous",null]
[1320,null,4032,"Tg","LG005","Granitic rocks","Quartz monzonite, biotite granite, and alaskite","Tertiary",null,"The pluton on the Yukon River yielded a U-Pb zircon age of 60.5 +/- 0.2 Ma; the Manley pluton, on the southern boundary of the map area in the Tanana quadrangle, yielded a U-Pb zircon age of 60.9 +/- 1.0 Ma (A.B.Till, unpub. data).   40Ar/39Ar ages have","Livengood","Igneous",null]
[1320,null,4032,"Tg","TN009","Granitic rocks","Quartz monzonite, biotite granite, and alaskite","Tertiary",null,"The pluton on the Yukon River yielded a U-Pb zircon age of 60.5 +/- 0.2 Ma; the Manley pluton, on the southern boundary of the map area in the Tanana quadrangle, yielded a U-Pb zircon age of 60.9 +/- 1.0 Ma (A.B.Till, unpub. data).   40Ar/39Ar ages have","Tanana","Igneous",null]
[1510,null,4033,"TKs","CY006","Sedimentary rocks","Sandstone, mudstone, thin coal seems, and conglomerate exposed in the Takonduk and Rampart areas.","Tertiary and Cretaceous","Late Cretaceous, Paleocene, and Eocene pollen have been recovered from exposures within and immediately south of the map area (Miyaoka, 1990), and from shallow core holes (unpublished oil industry data, written commun., 2002).\rIn the western Rampart area",null,"Charley River","Sedimentary",null]
[1510,null,4033,"TKs","TN009","Sedimentary rocks","Sandstone, mudstone, thin coal seems, and conglomerate exposed in the Takonduk and Rampart areas.","Tertiary and Cretaceous","Late Cretaceous, Paleocene, and Eocene pollen have been recovered from exposures within and immediately south of the map area (Miyaoka, 1990), and from shallow core holes (unpublished oil industry data, written commun., 2002).\rIn the western Rampart area",null,"Tanana","Sedimentary",null]
[2030,null,4014,"Kkyu","BT004","Sedimentary rocks of the Yukon-Koyukuk basin, undivided","Marine volcanic-clast conglomerate, graywacke, sandstone, mudstone, shale, calcareous sandstone, siltstone and shale, and minor non-marine sandstone and shale.","Cretaceous","Mollusks from the marine part of the unit are Albian; rare plant fossils from the non-marine part of the section range from late Early Cretaceous to Late Cretaceous in age (Patton and others, in press).",null,"Bettles","Sedimentary",null]
[2030,null,4014,"Kkyu","CH003","Sedimentary rocks of the Yukon-Koyukuk basin, undivided","Marine volcanic-clast conglomerate, graywacke, sandstone, mudstone, shale, calcareous sandstone, siltstone and shale, and minor non-marine sandstone and shale.","Cretaceous","Mollusks from the marine part of the unit are Albian; rare plant fossils from the non-marine part of the section range from late Early Cretaceous to Late Cretaceous in age (Patton and others, in press).",null,"Chandalar","Sedimentary",null]
[2030,null,4014,"Kkyu","TN009","Sedimentary rocks of the Yukon-Koyukuk basin, undivided","Marine volcanic-clast conglomerate, graywacke, sandstone, mudstone, shale, calcareous sandstone, siltstone and shale, and minor non-marine sandstone and shale.","Cretaceous","Mollusks from the marine part of the unit are Albian; rare plant fossils from the non-marine part of the section range from late Early Cretaceous to Late Cretaceous in age (Patton and others, in press).",null,"Tanana","Sedimentary",null]
[2030,null,4014,"Kkyu","WI005","Sedimentary rocks of the Yukon-Koyukuk basin, undivided","Marine volcanic-clast conglomerate, graywacke, sandstone, mudstone, shale, calcareous sandstone, siltstone and shale, and minor non-marine sandstone and shale.","Cretaceous","Mollusks from the marine part of the unit are Albian; rare plant fossils from the non-marine part of the section range from late Early Cretaceous to Late Cretaceous in age (Patton and others, in press).",null,"Wiseman","Sedimentary",null]
[2122,null,4013,"Kku","BR003","Sedimentary rocks of the Kandik basin, undivided","Carbonaceous shale, siltstone, quartz arenite, argillite, graywacke, sandstone, and conglomerate; parts of the section are rich in volcanic clasts.","Cretaceous","Early Cretaceous (Valanginian and Berriasian) megafossils have been identified. Although correlations have been made between units in the Kandik basin and units in the Manley basin that contain Albian fossils (Dover, 1994), no unequivocally Albian strata",null,"Black River","Sedimentary",null]
[2122,null,4013,"Kku","CY006","Sedimentary rocks of the Kandik basin, undivided","Carbonaceous shale, siltstone, quartz arenite, argillite, graywacke, sandstone, and conglomerate; parts of the section are rich in volcanic clasts.","Cretaceous","Early Cretaceous (Valanginian and Berriasian) megafossils have been identified. Although correlations have been made between units in the Kandik basin and units in the Manley basin that contain Albian fossils (Dover, 1994), no unequivocally Albian strata",null,"Charley River","Sedimentary",null]
[2492,null,4010,"Kg","BT004","Granitic rocks","Small plugs to large, batholithic plutons","Cretaceous",null,"Ruby geanticline plutons are generally evolved and yield U-Pb zircon and K/Ar ages of 112-90 Ma (Patton and others, 1994). In the Manley basin and western Yukon-Tanana Upland, plutons are slightly younger; they have yielded K/Ar and 40Ar/39Ar ages that r","Bettles","Igneous",null]
[2492,null,4010,"Kg","BV003","Granitic rocks","Small plugs to large, batholithic plutons","Cretaceous",null,"Ruby geanticline plutons are generally evolved and yield U-Pb zircon and K/Ar ages of 112-90 Ma (Patton and others, 1994). In the Manley basin and western Yukon-Tanana Upland, plutons are slightly younger; they have yielded K/Ar and 40Ar/39Ar ages that r","Beaver","Igneous",null]
[2492,null,4010,"Kg","CH003","Granitic rocks","Small plugs to large, batholithic plutons","Cretaceous",null,"Ruby geanticline plutons are generally evolved and yield U-Pb zircon and K/Ar ages of 112-90 Ma (Patton and others, 1994). In the Manley basin and western Yukon-Tanana Upland, plutons are slightly younger; they have yielded K/Ar and 40Ar/39Ar ages that r","Chandalar","Igneous",null]
[2492,null,4010,"Kg","CI006","Granitic rocks","Small plugs to large, batholithic plutons","Cretaceous",null,"Ruby geanticline plutons are generally evolved and yield U-Pb zircon and K/Ar ages of 112-90 Ma (Patton and others, 1994). In the Manley basin and western Yukon-Tanana Upland, plutons are slightly younger; they have yielded K/Ar and 40Ar/39Ar ages that r","Circle","Igneous",null]
[2492,null,4010,"Kg","CY006","Granitic rocks","Small plugs to large, batholithic plutons","Cretaceous",null,"Ruby geanticline plutons are generally evolved and yield U-Pb zircon and K/Ar ages of 112-90 Ma (Patton and others, 1994). In the Manley basin and western Yukon-Tanana Upland, plutons are slightly younger; they have yielded K/Ar and 40Ar/39Ar ages that r","Charley River","Igneous",null]
[2492,null,4010,"Kg","LG005","Granitic rocks","Small plugs to large, batholithic plutons","Cretaceous",null,"Ruby geanticline plutons are generally evolved and yield U-Pb zircon and K/Ar ages of 112-90 Ma (Patton and others, 1994). In the Manley basin and western Yukon-Tanana Upland, plutons are slightly younger; they have yielded K/Ar and 40Ar/39Ar ages that r","Livengood","Igneous",null]
[2492,null,4010,"Kg","TN009","Granitic rocks","Small plugs to large, batholithic plutons","Cretaceous",null,"Ruby geanticline plutons are generally evolved and yield U-Pb zircon and K/Ar ages of 112-90 Ma (Patton and others, 1994). In the Manley basin and western Yukon-Tanana Upland, plutons are slightly younger; they have yielded K/Ar and 40Ar/39Ar ages that r","Tanana","Igneous",null]
[2810,null,4017,"KJu","BR003","Sedimentary rocks, undifferentiated","Scattered occurrences of shale, argillite and quartzite up to 300m thick.","Cretaceous? and Jurassic?","Bivalves of Jurassic or Cretaceous age reported from one exposure in the Coleen quadrangle (Brosgé and Reiser, 1969).",null,"Black River","Sedimentary",null]
[2810,null,4017,"KJu","CO003","Sedimentary rocks, undifferentiated","Scattered occurrences of shale, argillite and quartzite up to 300m thick.","Cretaceous? and Jurassic?","Bivalves of Jurassic or Cretaceous age reported from one exposure in the Coleen quadrangle (Brosgé and Reiser, 1969).",null,"Coleen","Sedimentary",null]
[2860,null,4016,"Mzmv","CI006","Fine-graned sedimentary rocks and tuff","Slate, shale, siltstone, argillite, tuff, and minor quartzite and conglomerate","Cretaceous? and Jurassic?",null,null,"Circle","Sedimentary",null]
[2860,null,4016,"Mzmv","LG005","Fine-graned sedimentary rocks and tuff","Slate, shale, siltstone, argillite, tuff, and minor quartzite and conglomerate","Cretaceous? and Jurassic?",null,null,"Livengood","Sedimentary",null]
[2861,null,4011,"KJg","CY006","Glenn Shale, upper part","Carbonaceous shale that contains minor thin (up to 5m) beds of fine-grained sandstone","Late Cretaceous and Jurassic?","Early Cretaceous megafossils have been collected from several localities within the unit (Miyaoka, 1990).",null,"Charley River","Sedimentary",null]
[3270,null,4007,"JMsu","CO003","Strangle Woman Creek sequence of Brosge' and Reiser (1969), undivided","Rock types include very fine grained to conglomeratic sandstone; gray limestone and dolostone; dark gray, very fine grained, thin-bedded limestone and black chert; and coarse-grained, conglomeratic, quartz sandstone that contain minor potassium feldspar","Jurassic to Mississippian","Early Jurassic (Hettangian) ammonites (Brosgé and Reiser (1969).  Unit also contains Permian or Carboniferous brachiopods and corals and Late Mississippian corals (Brosgé and Reiser, 1969), as well as tightly dated Carboniferous conodonts.  Conodont faun",null,"Coleen","Sedimentary",null]
[3280,null,4006,"JMpu","CO003","Younger strata of the Porcupine River sequence of Brosge' and Reiser (1969), undivided","Main rock types are ferruginous, very fine grained sandstone; gray to black pyritic siltstone and silty shale; laminated, red and green chert; silty, shaly, and cherty limestone; coarse-grained to conglomeratic, locally feldspathic sandstone, mafic flows","Jurassic to Mississippian","Carboniferous, Permian, and Jurassic megafauna are reported (Brosgé and Reiser, 1969).",null,"Coleen","Sedimentary",null]
[4730,null,4012,"KJmu","CI006","Sedimentary rocks of the Manley basin, undivided","Quartzite, shale, siltstone, graywacke, polymictic conglomerate","Cretaceous and Jurassic","Older parts of the unit contain marine megafauna of Jurassic and Early Cretaceous (including Albian) age and the Minto unit has yielded plant fossils of Late Cretaceous(?) age (Weber and others, 1994).",null,"Circle","Sedimentary",null]
[4730,null,4012,"KJmu","LG005","Sedimentary rocks of the Manley basin, undivided","Quartzite, shale, siltstone, graywacke, polymictic conglomerate","Cretaceous and Jurassic","Older parts of the unit contain marine megafauna of Jurassic and Early Cretaceous (including Albian) age and the Minto unit has yielded plant fossils of Late Cretaceous(?) age (Weber and others, 1994).",null,"Livengood","Sedimentary",null]
[4730,null,4012,"KJmu","TN009","Sedimentary rocks of the Manley basin, undivided","Quartzite, shale, siltstone, graywacke, polymictic conglomerate","Cretaceous and Jurassic","Older parts of the unit contain marine megafauna of Jurassic and Early Cretaceous (including Albian) age and the Minto unit has yielded plant fossils of Late Cretaceous(?) age (Weber and others, 1994).",null,"Tanana","Sedimentary",null]
[5012,null,4035,"TrPs","LG005","Sedimentary rocks","Argillite, siltstone, sandstone, shale, chert, limestone, conglomerate, and limestone debris flows.  The unit is structurally imbricated with the sedimentary rocks of the Manley basin (KJmu).","Triassic? to early Permian","Conodonts, foraminifera, and megafossils yielded Permian and less definite late Paleozoic ages (Weber and others, 1994); Triassic Radiolaria were also recovered (Weber and others,1992).",null,"Livengood","Sedimentary",null]
[5012,null,4035,"TrPs","TN009","Sedimentary rocks","Argillite, siltstone, sandstone, shale, chert, limestone, conglomerate, and limestone debris flows.  The unit is structurally imbricated with the sedimentary rocks of the Manley basin (KJmu).","Triassic? to early Permian","Conodonts, foraminifera, and megafossils yielded Permian and less definite late Paleozoic ages (Weber and others, 1994); Triassic Radiolaria were also recovered (Weber and others,1992).",null,"Tanana","Sedimentary",null]
[5035,null,4034,"TrPgt","CI006","Glenn Shale, lower part, and Tahkandit Limestone, undivided","Thin-bedded fossiliferous limestone, calcareous shale and rare thin oil shale of the lower part of the Glenn Shale, and massive bioclastic limestone, glauconitic sandstone, and minor chert pebble conglomerate of the Tahkandit Limestone","Triassic and Permian","In the central Yukon-Tanana province, exposures of this unit are lithologically similar to the lower part of the Glenn Shale and have yielded Permian to Triassic conodonts (Weber and others, 1994).  In the southern part of the Porcupine province, the low",null,"Circle","Sedimentary",null]
[5035,null,4034,"TrPgt","CY006","Glenn Shale, lower part, and Tahkandit Limestone, undivided","Thin-bedded fossiliferous limestone, calcareous shale and rare thin oil shale of the lower part of the Glenn Shale, and massive bioclastic limestone, glauconitic sandstone, and minor chert pebble conglomerate of the Tahkandit Limestone","Triassic and Permian","In the central Yukon-Tanana province, exposures of this unit are lithologically similar to the lower part of the Glenn Shale and have yielded Permian to Triassic conodonts (Weber and others, 1994).  In the southern part of the Porcupine province, the low",null,"Charley River","Sedimentary",null]
[5035,null,4034,"TrPgt","LG005","Glenn Shale, lower part, and Tahkandit Limestone, undivided","Thin-bedded fossiliferous limestone, calcareous shale and rare thin oil shale of the lower part of the Glenn Shale, and massive bioclastic limestone, glauconitic sandstone, and minor chert pebble conglomerate of the Tahkandit Limestone","Triassic and Permian","In the central Yukon-Tanana province, exposures of this unit are lithologically similar to the lower part of the Glenn Shale and have yielded Permian to Triassic conodonts (Weber and others, 1994).  In the southern part of the Porcupine province, the low",null,"Livengood","Sedimentary",null]
[5036,null,4018,"PCta","CY006","Sedimentary rocks of the Tatonduk area","Limestone, argillite, shale, chert, quartz arenite and conglomerate exposed in the southern part of the Porcupine province.","Permian to Cambrian",null,null,"Charley River","Sedimentary",null]
[5133,null,4005,"JDat","BT004","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Bettles","Igneous",null]
[5133,null,4005,"JDat","BV003","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Beaver","Igneous",null]
[5133,null,4005,"JDat","CH003","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Chandalar","Igneous",null]
[5133,null,4005,"JDat","CI006","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Circle","Igneous",null]
[5133,null,4005,"JDat","CO003","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Coleen","Igneous",null]
[5133,null,4005,"JDat","CS003","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Christian","Igneous",null]
[5133,null,4005,"JDat","CY006","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Charley River","Igneous",null]
[5133,null,4005,"JDat","LG005","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Livengood","Igneous",null]
[5133,null,4005,"JDat","TN009","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Tanana","Igneous",null]
[5133,null,4005,"JDat","WI005","Angayucham-Tozitna terrane, undivided","Lithologically diverse, structurally imbricated igneous and sedimentary rocks of oceanic affinity exposed on all flanks of the Yukon Flats basin. Igneous rocks include ultramafic, mafic extrusive and intrusive, andesitic, and rare dacitic to rhyolitic ig","Late Jurassic to Devonian","Radiolarians, conodonts, and pollen from sedimentary rocks interlayered with the mafic rocks and from the predominantly sedimentary sections yielded ages of Devonian, Mississippian, Pennsylvanian, Permian, Triassic, and Early Jurassic.","Hornblende from four exposures of gabbro in the Rampart area and Christian quadrangle have yielded K-Ar ages that range from 207 to 174 Ma (Brosgé and others, 1969; Brosgé and Reiser, 2000), but low potassium contents of the amphiboles (and low radiogeni","Wiseman","Igneous",null]
[5209,null,4019,"MzPza","CY006","Low-grade metamorphic rocks","Phyllite, argillaceous metachert, limestone, and associated mafic rocks.","Mesozoic? and Paleozoic",null,null,"Charley River","Metamorphic",null]
[5213,null,4036,"TrPzd","CH003","Metasedimentary and metavolcanic rocks, sedimentary rocks of the Doonerak area","Fine-grained metasedimentary rocks that contain lenticular bodies of carbonate rocks; metavolcanic and metavolcaniclastic rocks of island arc affinity, and a thin sequence of shale, siltstone and limestone (Dillon and others, 1986; Moore and others, 1994","Triassic to late Paleozoic","Cambrian, Ordovician, and Silurian megafossils have been recovered from the metasedimentary rocks (Moore and others, 1994).",null,"Chandalar","Sedimentary",null]
[5213,null,4036,"TrPzd","WI005","Metasedimentary and metavolcanic rocks, sedimentary rocks of the Doonerak area","Fine-grained metasedimentary rocks that contain lenticular bodies of carbonate rocks; metavolcanic and metavolcaniclastic rocks of island arc affinity, and a thin sequence of shale, siltstone and limestone (Dillon and others, 1986; Moore and others, 1994","Triassic to late Paleozoic","Cambrian, Ordovician, and Silurian megafossils have been recovered from the metasedimentary rocks (Moore and others, 1994).",null,"Wiseman","Sedimentary",null]
[5335,null,4029,"Pzvu","CH003","Sedimentary rocks of the Venetie terrane of Silberling and others (1994), undivided","Lithic and quartz wacke, metamorphosed wacke, metasandstone, phyllite, slate, shale, quartzite, chert, and minor greenstone (Brosgé and Reiser, 2000).","Paleozoic","Devonian (?) plants and spores, Mississippian (?) Radiolaria, and Permian conodonts have been recovered from this unit.",null,"Chandalar","Sedimentary",null]
[5335,null,4029,"Pzvu","CO003","Sedimentary rocks of the Venetie terrane of Silberling and others (1994), undivided","Lithic and quartz wacke, metamorphosed wacke, metasandstone, phyllite, slate, shale, quartzite, chert, and minor greenstone (Brosgé and Reiser, 2000).","Paleozoic","Devonian (?) plants and spores, Mississippian (?) Radiolaria, and Permian conodonts have been recovered from this unit.",null,"Coleen","Sedimentary",null]
[5335,null,4029,"Pzvu","CS003","Sedimentary rocks of the Venetie terrane of Silberling and others (1994), undivided","Lithic and quartz wacke, metamorphosed wacke, metasandstone, phyllite, slate, shale, quartzite, chert, and minor greenstone (Brosgé and Reiser, 2000).","Paleozoic","Devonian (?) plants and spores, Mississippian (?) Radiolaria, and Permian conodonts have been recovered from this unit.",null,"Christian","Sedimentary",null]
[5335,null,4039,"Pzcm","CO003","Metamorphic rocks","Semischist, phyllite, and thin layers of mafic rock exposed in the extreme northeast corner of the Porcupine province.  Rocks are generally fine grained, and the metamorphic assemblage locally includes biotite and garnet. Contact with adjacent granite is","Paleozoic?",null,null,"Coleen","Metamorphic",null]
[5470,null,4028,"Pzum","TN009","Ultramafic rocks","Serpentinite and lesser gabbro and rodingite rubble","Paleozoic?",null,"Hornblende from gabbro has yielded a disturbed 40Ar/39Ar age spectrum suggestive of early Paleozoic age (Reifenstuhl and others, 1998).","Tanana","Igneous",null]
[5560,null,4003,"DZs","CH003","Metamorphosed sedimentary rocks","Variably metamorphosed and deformed shale, siltstone, fine- to medium-grained sandstone, graywacke, quartz and chert wacke, and minor conglomerate, carbonate, and mafic rocks.  Quartz-rich rocks that contain chert clasts are common. Sedimentary structure","Devonian to Proterozoic","Five localities in the large exposure of the unit in the central Tanana quadrangle yielded Late Devonian (Famennian) conodonts (A.G. Harris, USGS Emeritus, written commun., 2000).","Detrital zircon populations have been used to coorelate this unit with others (see description).","Chandalar","Metamorphic",null]
[5560,null,4003,"DZs","WI005","Metamorphosed sedimentary rocks","Variably metamorphosed and deformed shale, siltstone, fine- to medium-grained sandstone, graywacke, quartz and chert wacke, and minor conglomerate, carbonate, and mafic rocks.  Quartz-rich rocks that contain chert clasts are common. Sedimentary structure","Devonian to Proterozoic","Five localities in the large exposure of the unit in the central Tanana quadrangle yielded Late Devonian (Famennian) conodonts (A.G. Harris, USGS Emeritus, written commun., 2000).","Detrital zircon populations have been used to coorelate this unit with others (see description).","Wiseman","Metamorphic",null]
[5561,null,4040,"DZs","BT004","Metamorphosed sedimentary rocks","Variably metamorphosed and deformed shale, siltstone, fine- to medium-grained sandstone, graywacke, quartz and chert wacke, and minor conglomerate, carbonate, and mafic rocks.  Quartz-rich rocks that contain chert clasts are common. Sedimentary structure","Devonian to Proterozoic","Five localities in the large exposure of the unit in the central Tanana quadrangle yielded Late Devonian (Famennian) conodonts (A.G. Harris, USGS Emeritus, written commun., 2000).","Detrital zircon populations have been used to coorelate this unit with others (see description).","Bettles","Metamorphic",null]
[5561,null,4040,"DZs","BV003","Metamorphosed sedimentary rocks","Variably metamorphosed and deformed shale, siltstone, fine- to medium-grained sandstone, graywacke, quartz and chert wacke, and minor conglomerate, carbonate, and mafic rocks.  Quartz-rich rocks that contain chert clasts are common. Sedimentary structure","Devonian to Proterozoic","Five localities in the large exposure of the unit in the central Tanana quadrangle yielded Late Devonian (Famennian) conodonts (A.G. Harris, USGS Emeritus, written commun., 2000).","Detrital zircon populations have been used to coorelate this unit with others (see description).","Beaver","Metamorphic",null]
[5561,null,4040,"DZs","TN009","Metamorphosed sedimentary rocks","Variably metamorphosed and deformed shale, siltstone, fine- to medium-grained sandstone, graywacke, quartz and chert wacke, and minor conglomerate, carbonate, and mafic rocks.  Quartz-rich rocks that contain chert clasts are common. Sedimentary structure","Devonian to Proterozoic","Five localities in the large exposure of the unit in the central Tanana quadrangle yielded Late Devonian (Famennian) conodonts (A.G. Harris, USGS Emeritus, written commun., 2000).","Detrital zircon populations have been used to coorelate this unit with others (see description).","Tanana","Metamorphic",null]
[5965,null,4027,"Pzqs","BR003","Sedimentary and igneous rocks","Quartz-rich sedimentary rocks, associated carbonate rocks and minor mafic volcanic rocks.","Permian, Carboniferous, and Devonian","In the Charley River quadrangle the unit also includes shale, argillite, and limestone that contains Permian and Carboniferous brachiopods (Brabb and Churkin, 1969).",null,"Black River","Sedimentary",null]
[5965,null,4027,"Pzqs","CI006","Sedimentary and igneous rocks","Quartz-rich sedimentary rocks, associated carbonate rocks and minor mafic volcanic rocks.","Permian, Carboniferous, and Devonian","In the Charley River quadrangle the unit also includes shale, argillite, and limestone that contains Permian and Carboniferous brachiopods (Brabb and Churkin, 1969).",null,"Circle","Sedimentary",null]
[5965,null,4027,"Pzqs","CO003","Sedimentary and igneous rocks","Quartz-rich sedimentary rocks, associated carbonate rocks and minor mafic volcanic rocks.","Permian, Carboniferous, and Devonian","In the Charley River quadrangle the unit also includes shale, argillite, and limestone that contains Permian and Carboniferous brachiopods (Brabb and Churkin, 1969).",null,"Coleen","Sedimentary",null]
[5965,null,4027,"Pzqs","CY006","Sedimentary and igneous rocks","Quartz-rich sedimentary rocks, associated carbonate rocks and minor mafic volcanic rocks.","Permian, Carboniferous, and Devonian","In the Charley River quadrangle the unit also includes shale, argillite, and limestone that contains Permian and Carboniferous brachiopods (Brabb and Churkin, 1969).",null,"Charley River","Sedimentary",null]
[6300,null,4009,"KDe","CH003","Sedimentary rocks of the Endicott Mountains allochthon of Moore and others (1994)","Thick marine and non-marine sedimentary sequence dominated by Devonian and Mississippian clastic and carbonate rocks of the Endicott and Lisburne Groups (Moore and others, 1994)","Cretaceous to Devonian",null,null,"Chandalar","Sedimentary",null]
[6300,null,4009,"KDe","WI005","Sedimentary rocks of the Endicott Mountains allochthon of Moore and others (1994)","Thick marine and non-marine sedimentary sequence dominated by Devonian and Mississippian clastic and carbonate rocks of the Endicott and Lisburne Groups (Moore and others, 1994)","Cretaceous to Devonian",null,null,"Wiseman","Sedimentary",null]
[6328,null,4015,"Mbu","CO003","Rocks of Brooks Range sequence of Brosge' and Reiser (2000), undivided","Consists of gray to brown, fine- to medium-grained, partly crinoidal limestone (Lisburne Group); black shale, laminated siltstone, chert, and orange-weathering limestone (Kayak Shale); and unnamed black siltstone and shaly phosphatic limestone (Brosgé an","Mississippian","Contains mega- and microfossils of Mississippian age.",null,"Coleen","Sedimentary",null]
[6970,null,4002,"DCpu","BR003","Older strata of the Porcupine River sequence of Brosge' and Reiser (1969), undivided","Succession includes dark gray limestone and lesser dolostone and light to dark gray, locally mottled dolostone and limestone.  Subordinate lithologies are gray and black chert, black shale, red and green shale and sandstone, and limestone cobble conglome","Devonian to Cambrian","Limestone and lesser dolostone contain Middle Devonian corals.  Most precise ages for older part of succession based on Late Silurian and Late(?) Ordovician corals and Cambrian(?) trilobites (Brosgé and Reiser, 1969).  Conodonts of Early Silurian and mid",null,"Black River","Sedimentary",null]
[6970,null,4002,"DCpu","CO003","Older strata of the Porcupine River sequence of Brosge' and Reiser (1969), undivided","Succession includes dark gray limestone and lesser dolostone and light to dark gray, locally mottled dolostone and limestone.  Subordinate lithologies are gray and black chert, black shale, red and green shale and sandstone, and limestone cobble conglome","Devonian to Cambrian","Limestone and lesser dolostone contain Middle Devonian corals.  Most precise ages for older part of succession based on Late Silurian and Late(?) Ordovician corals and Cambrian(?) trilobites (Brosgé and Reiser, 1969).  Conodonts of Early Silurian and mid",null,"Coleen","Sedimentary",null]
[6990,null,4004,"DSc","CI006","Metamorphosed sedimentary rocks","Chert and chert-pebble conglomerate, calcarenite, conglomeratic limestone, limestone, metasiltstone and argillite, mafic intrusive rocks, and rare dolostone.","Devonian and Silurian","Conodonts recovered from the unit have broad age ranges, are Late Devonian (Famennian) or are Silurian in age (A.G. Harris, USGS Emeritus, written commun., 2000).  Silurian conodonts were collected along the northern contact of DSc and may be from a faul",null,"Circle","Metamorphic",null]
[7050,null,4000,"Cg","CO003","Granite","Granite and quartz monzonite, exposed in large body on the northeast boundary of the map.  Northern contact with adjacent metamorphic rocks is intrusive; southern boundary is shown as a fault but is not well exposed nor well understood.","Carboniferous",null,"K/Ar mica ages range from 354 to 302 Ma (Brosgé and Reiser, 1969).","Coleen","Igneous",null]
[7990,null,4001,"CPt","BR003","Sedimentary rocks of the Tindir Group","Phyllite, slate, siltstone, argillite, quartzite, red beds, carbonate-clast conglomerate, dolostone, limestone, basalt, chert, and glacial diamictite exposed in the southeast part of the Porcupine province.  See Dover (1994) for a summary of the formal u","Cambrian? and Proterozoic","The Cambrian(?) age is based on several occurrences of the trace fossil Oldhamia (Miyaoka, 1990).",null,"Black River","Sedimentary",null]
[7990,null,4001,"CPt","CY006","Sedimentary rocks of the Tindir Group","Phyllite, slate, siltstone, argillite, quartzite, red beds, carbonate-clast conglomerate, dolostone, limestone, basalt, chert, and glacial diamictite exposed in the southeast part of the Porcupine province.  See Dover (1994) for a summary of the formal u","Cambrian? and Proterozoic","The Cambrian(?) age is based on several occurrences of the trace fossil Oldhamia (Miyaoka, 1990).",null,"Charley River","Sedimentary",null]
[8440,null,4023,"PzZl","CI006","Sedimentary and igneous rocks corresponding to the Livengood area swquence of Weber and others (1992)","Argillite, phyllite, quartzite, graywacke, siltite, grit and limestone of the Wickersham unit; mafic intrusive and extrusive rocks and fine grained sedimentary rocks interlayered with serpentinite, equivalent to \"PzZm\" and \"CZum\" units; dolomite, chert,","Paleozoic to Proterozoic","Weber and others (1994) reported all paleontologic control on the age the rocks in this unit. Late Ordovician graptolites were recovered from sedimentary rocks of the Livengood Dome Chert; megafossils from the lime mudstone of the Lost Creek unit are Sil","Gabbro associated with the serpentinite of \"CZum\" yielded a 40Ar/39Ar hornblende age of 535.3 +/-  2.7 Ma (Athey and others, 2004).","Circle","Sedimentary",null]
[8440,null,4023,"PzZl","LG005","Sedimentary and igneous rocks corresponding to the Livengood area swquence of Weber and others (1992)","Argillite, phyllite, quartzite, graywacke, siltite, grit and limestone of the Wickersham unit; mafic intrusive and extrusive rocks and fine grained sedimentary rocks interlayered with serpentinite, equivalent to \"PzZm\" and \"CZum\" units; dolomite, chert,","Paleozoic to Proterozoic","Weber and others (1994) reported all paleontologic control on the age the rocks in this unit. Late Ordovician graptolites were recovered from sedimentary rocks of the Livengood Dome Chert; megafossils from the lime mudstone of the Lost Creek unit are Sil","Gabbro associated with the serpentinite of \"CZum\" yielded a 40Ar/39Ar hornblende age of 535.3 +/-  2.7 Ma (Athey and others, 2004).","Livengood","Sedimentary",null]
[8440,null,4023,"PzZl","TN009","Sedimentary and igneous rocks corresponding to the Livengood area swquence of Weber and others (1992)","Argillite, phyllite, quartzite, graywacke, siltite, grit and limestone of the Wickersham unit; mafic intrusive and extrusive rocks and fine grained sedimentary rocks interlayered with serpentinite, equivalent to \"PzZm\" and \"CZum\" units; dolomite, chert,","Paleozoic to Proterozoic","Weber and others (1994) reported all paleontologic control on the age the rocks in this unit. Late Ordovician graptolites were recovered from sedimentary rocks of the Livengood Dome Chert; megafossils from the lime mudstone of the Lost Creek unit are Sil","Gabbro associated with the serpentinite of \"CZum\" yielded a 40Ar/39Ar hornblende age of 535.3 +/-  2.7 Ma (Athey and others, 2004).","Tanana","Sedimentary",null]
[8441,null,4025,"PzZw","CI006","Sedimentary and igneous rocks corresponding to the older parts of the Fairbanks-White Mountains area sequence of Weber and others (1992)","Argillite, grit, quartzite, graywacke, phyllite, limestone, and dolomite, equivalent to the Wickersham unit;  alkali basalt, agglomerate, volcanic conglomerate, and associated limestone, sandstone and chert, equivalent to the Fossil Creek Volcanics; muds","Paleozoic to Proterozoic","All fossil ages for the unit are reported in Weber and others (1994).  The part of the sequence that includes the grit contains the Precambrian to Cambrian trace fossil Oldhamia; sedimentary rocks associated with the alkali basalt yielded mega-and micro-",null,"Circle","Sedimentary",null]
[8441,null,4025,"PzZw","LG005","Sedimentary and igneous rocks corresponding to the older parts of the Fairbanks-White Mountains area sequence of Weber and others (1992)","Argillite, grit, quartzite, graywacke, phyllite, limestone, and dolomite, equivalent to the Wickersham unit;  alkali basalt, agglomerate, volcanic conglomerate, and associated limestone, sandstone and chert, equivalent to the Fossil Creek Volcanics; muds","Paleozoic to Proterozoic","All fossil ages for the unit are reported in Weber and others (1994).  The part of the sequence that includes the grit contains the Precambrian to Cambrian trace fossil Oldhamia; sedimentary rocks associated with the alkali basalt yielded mega-and micro-",null,"Livengood","Sedimentary",null]
[8441,null,4025,"PzZw","TN009","Sedimentary and igneous rocks corresponding to the older parts of the Fairbanks-White Mountains area sequence of Weber and others (1992)","Argillite, grit, quartzite, graywacke, phyllite, limestone, and dolomite, equivalent to the Wickersham unit;  alkali basalt, agglomerate, volcanic conglomerate, and associated limestone, sandstone and chert, equivalent to the Fossil Creek Volcanics; muds","Paleozoic to Proterozoic","All fossil ages for the unit are reported in Weber and others (1994).  The part of the sequence that includes the grit contains the Precambrian to Cambrian trace fossil Oldhamia; sedimentary rocks associated with the alkali basalt yielded mega-and micro-",null,"Tanana","Sedimentary",null]
[8442,null,4024,"PzZs","CI006","Sedimentary and igneous rocks corresponding to older parts of the Schwatka-Rampart area sequence of Webber and others (1992)","Grit, argillite, quartzite, siltite, graywacke, phyllite, and minor limestone; interlayered mafic volcanic rocks and limestone, minor associated greenstone, limestone, and limestone debris flows, and a group of fine-grained metamorphic and sedimentary ro","Paleozoic to Proterozoic","The part of the sequence that includes the grit yielded the trace fossil Oldhamia, of Precambrian to Cambrian age; limestone interlayered with mafic volcanic rocks yielded Devonian megafossils and Early and Middle Devonian conodonts (Weber and others, 19",null,"Circle","Sedimentary",null]
[8442,null,4024,"PzZs","LG005","Sedimentary and igneous rocks corresponding to older parts of the Schwatka-Rampart area sequence of Webber and others (1992)","Grit, argillite, quartzite, siltite, graywacke, phyllite, and minor limestone; interlayered mafic volcanic rocks and limestone, minor associated greenstone, limestone, and limestone debris flows, and a group of fine-grained metamorphic and sedimentary ro","Paleozoic to Proterozoic","The part of the sequence that includes the grit yielded the trace fossil Oldhamia, of Precambrian to Cambrian age; limestone interlayered with mafic volcanic rocks yielded Devonian megafossils and Early and Middle Devonian conodonts (Weber and others, 19",null,"Livengood","Sedimentary",null]
[8442,null,4024,"PzZs","TN009","Sedimentary and igneous rocks corresponding to older parts of the Schwatka-Rampart area sequence of Webber and others (1992)","Grit, argillite, quartzite, siltite, graywacke, phyllite, and minor limestone; interlayered mafic volcanic rocks and limestone, minor associated greenstone, limestone, and limestone debris flows, and a group of fine-grained metamorphic and sedimentary ro","Paleozoic to Proterozoic","The part of the sequence that includes the grit yielded the trace fossil Oldhamia, of Precambrian to Cambrian age; limestone interlayered with mafic volcanic rocks yielded Devonian megafossils and Early and Middle Devonian conodonts (Weber and others, 19",null,"Tanana","Sedimentary",null]
[8630,null,4026,"PzpCy","CI006","Metamorphic rocks of the Yukon-Tanana Upland, undivided","Fault-bounded assemblages of lithologically and metamorphically distinct metaigneous and metasedimentary rocks that have Paleozoic and Precambrian(?) protoliths.  Structurally lower assemblages, most with continental affinities, have been deformed in a d","Paleozoic to Precambrian?",null,"U-Pb dates (see description)","Circle","Metamorphic",null]
[8630,null,4026,"PzpCy","CY006","Metamorphic rocks of the Yukon-Tanana Upland, undivided","Fault-bounded assemblages of lithologically and metamorphically distinct metaigneous and metasedimentary rocks that have Paleozoic and Precambrian(?) protoliths.  Structurally lower assemblages, most with continental affinities, have been deformed in a d","Paleozoic to Precambrian?",null,"U-Pb dates (see description)","Charley River","Metamorphic",null]
[8630,null,4026,"PzpCy","LG005","Metamorphic rocks of the Yukon-Tanana Upland, undivided","Fault-bounded assemblages of lithologically and metamorphically distinct metaigneous and metasedimentary rocks that have Paleozoic and Precambrian(?) protoliths.  Structurally lower assemblages, most with continental affinities, have been deformed in a d","Paleozoic to Precambrian?",null,"U-Pb dates (see description)","Livengood","Metamorphic",null]
[8850,null,4022,"PzpCh","CH003","Metasedimentary and metaigneous rocks of the Hammond terrane","Thick sequences of lower Paleozoic metacarbonate rocks commonly called the Skajit Limestone (Moore and others, 1994), thick sequences of metasiliciclastics, metamorphosed calcareous sedimentary rocks, and minor mafic metagabbro and metafelsite exposed im","Paleozoic and (or) Precambrian","Cambrian, Ordovician, Silurian, and Devonian fossils have been collected within the area shown on this map (Dumoulin and Harris, 1994).  Lower Paleozoic rocks contain fauna that have Siberian affinities (Dumoulin and others, 2002).",null,"Chandalar","Metamorphic",null]
[8850,null,4022,"PzpCh","CS003","Metasedimentary and metaigneous rocks of the Hammond terrane","Thick sequences of lower Paleozoic metacarbonate rocks commonly called the Skajit Limestone (Moore and others, 1994), thick sequences of metasiliciclastics, metamorphosed calcareous sedimentary rocks, and minor mafic metagabbro and metafelsite exposed im","Paleozoic and (or) Precambrian","Cambrian, Ordovician, Silurian, and Devonian fossils have been collected within the area shown on this map (Dumoulin and Harris, 1994).  Lower Paleozoic rocks contain fauna that have Siberian affinities (Dumoulin and others, 2002).",null,"Christian","Metamorphic",null]
[8850,null,4022,"PzpCh","WI005","Metasedimentary and metaigneous rocks of the Hammond terrane","Thick sequences of lower Paleozoic metacarbonate rocks commonly called the Skajit Limestone (Moore and others, 1994), thick sequences of metasiliciclastics, metamorphosed calcareous sedimentary rocks, and minor mafic metagabbro and metafelsite exposed im","Paleozoic and (or) Precambrian","Cambrian, Ordovician, Silurian, and Devonian fossils have been collected within the area shown on this map (Dumoulin and Harris, 1994).  Lower Paleozoic rocks contain fauna that have Siberian affinities (Dumoulin and others, 2002).",null,"Wiseman","Metamorphic",null]
[8852,null,4020,"PzpCm","BT004","Metamorphic rocks","Pelitic schist, amphibolite, metaquartzite, marble, and granitic orthogneiss that occur as three lenses in or near the Kobuk and Victoria Creek fault systems.  Not all lithologies are found in all three lenses.  Protolith ages are unknown.   Metamorphic","Paleozoic and (or) Precambrian?","The southern of two lenses along the Victoria Creek fault yielded three biotite and white mica 40Ar/39Ar ages of 61 Ma (Reifenstuhl and others, 1997a), which are interpreted as metamorphic cooling ages.  One of the lenses along the Kobuk fault system yie",null,"Bettles","Metamorphic",null]
[8852,null,4020,"PzpCm","CH003","Metamorphic rocks","Pelitic schist, amphibolite, metaquartzite, marble, and granitic orthogneiss that occur as three lenses in or near the Kobuk and Victoria Creek fault systems.  Not all lithologies are found in all three lenses.  Protolith ages are unknown.   Metamorphic","Paleozoic and (or) Precambrian?","The southern of two lenses along the Victoria Creek fault yielded three biotite and white mica 40Ar/39Ar ages of 61 Ma (Reifenstuhl and others, 1997a), which are interpreted as metamorphic cooling ages.  One of the lenses along the Kobuk fault system yie",null,"Chandalar","Metamorphic",null]
[8852,null,4020,"PzpCm","LG005","Metamorphic rocks","Pelitic schist, amphibolite, metaquartzite, marble, and granitic orthogneiss that occur as three lenses in or near the Kobuk and Victoria Creek fault systems.  Not all lithologies are found in all three lenses.  Protolith ages are unknown.   Metamorphic","Paleozoic and (or) Precambrian?","The southern of two lenses along the Victoria Creek fault yielded three biotite and white mica 40Ar/39Ar ages of 61 Ma (Reifenstuhl and others, 1997a), which are interpreted as metamorphic cooling ages.  One of the lenses along the Kobuk fault system yie",null,"Livengood","Metamorphic",null]
[8852,null,4020,"PzpCm","TN009","Metamorphic rocks","Pelitic schist, amphibolite, metaquartzite, marble, and granitic orthogneiss that occur as three lenses in or near the Kobuk and Victoria Creek fault systems.  Not all lithologies are found in all three lenses.  Protolith ages are unknown.   Metamorphic","Paleozoic and (or) Precambrian?","The southern of two lenses along the Victoria Creek fault yielded three biotite and white mica 40Ar/39Ar ages of 61 Ma (Reifenstuhl and others, 1997a), which are interpreted as metamorphic cooling ages.  One of the lenses along the Kobuk fault system yie",null,"Tanana","Metamorphic",null]
[8852,null,4020,"PzpCm","WI005","Metamorphic rocks","Pelitic schist, amphibolite, metaquartzite, marble, and granitic orthogneiss that occur as three lenses in or near the Kobuk and Victoria Creek fault systems.  Not all lithologies are found in all three lenses.  Protolith ages are unknown.   Metamorphic","Paleozoic and (or) Precambrian?","The southern of two lenses along the Victoria Creek fault yielded three biotite and white mica 40Ar/39Ar ages of 61 Ma (Reifenstuhl and others, 1997a), which are interpreted as metamorphic cooling ages.  One of the lenses along the Kobuk fault system yie",null,"Wiseman","Metamorphic",null]
[9325,null,4021,"PzpCb","BT004","Metasedimentary and metaigneous rocks of the southern Brooks Range and Ruby geanticline","Quartz-mica schist and lesser calcareous schist, marble, mafic schist, and granitic orthogneiss, exposed along the southern Brooks Range and axis of the Ruby geanticline.","Paleozoic and (or) Precambrian","Early Devonian microfossils were collected from marble in the Wiseman quadrangle (Moore and others, 1997).","U-Pb zircon ages from orthogneisses, which occur in both the Brooks Range and the Ruby geanticline, are Middle Devonian (Aleinikoff and others, 1993; Patton and others, 1987).","Bettles","Metamorphic",null]
[9325,null,4021,"PzpCb","BV003","Metasedimentary and metaigneous rocks of the southern Brooks Range and Ruby geanticline","Quartz-mica schist and lesser calcareous schist, marble, mafic schist, and granitic orthogneiss, exposed along the southern Brooks Range and axis of the Ruby geanticline.","Paleozoic and (or) Precambrian","Early Devonian microfossils were collected from marble in the Wiseman quadrangle (Moore and others, 1997).","U-Pb zircon ages from orthogneisses, which occur in both the Brooks Range and the Ruby geanticline, are Middle Devonian (Aleinikoff and others, 1993; Patton and others, 1987).","Beaver","Metamorphic",null]
[9325,null,4021,"PzpCb","CH003","Metasedimentary and metaigneous rocks of the southern Brooks Range and Ruby geanticline","Quartz-mica schist and lesser calcareous schist, marble, mafic schist, and granitic orthogneiss, exposed along the southern Brooks Range and axis of the Ruby geanticline.","Paleozoic and (or) Precambrian","Early Devonian microfossils were collected from marble in the Wiseman quadrangle (Moore and others, 1997).","U-Pb zircon ages from orthogneisses, which occur in both the Brooks Range and the Ruby geanticline, are Middle Devonian (Aleinikoff and others, 1993; Patton and others, 1987).","Chandalar","Metamorphic",null]
[9325,null,4021,"PzpCb","CS003","Metasedimentary and metaigneous rocks of the southern Brooks Range and Ruby geanticline","Quartz-mica schist and lesser calcareous schist, marble, mafic schist, and granitic orthogneiss, exposed along the southern Brooks Range and axis of the Ruby geanticline.","Paleozoic and (or) Precambrian","Early Devonian microfossils were collected from marble in the Wiseman quadrangle (Moore and others, 1997).","U-Pb zircon ages from orthogneisses, which occur in both the Brooks Range and the Ruby geanticline, are Middle Devonian (Aleinikoff and others, 1993; Patton and others, 1987).","Christian","Metamorphic",null]
[9325,null,4021,"PzpCb","TN009","Metasedimentary and metaigneous rocks of the southern Brooks Range and Ruby geanticline","Quartz-mica schist and lesser calcareous schist, marble, mafic schist, and granitic orthogneiss, exposed along the southern Brooks Range and axis of the Ruby geanticline.","Paleozoic and (or) Precambrian","Early Devonian microfossils were collected from marble in the Wiseman quadrangle (Moore and others, 1997).","U-Pb zircon ages from orthogneisses, which occur in both the Brooks Range and the Ruby geanticline, are Middle Devonian (Aleinikoff and others, 1993; Patton and others, 1987).","Tanana","Metamorphic",null]
[9325,null,4021,"PzpCb","WI005","Metasedimentary and metaigneous rocks of the southern Brooks Range and Ruby geanticline","Quartz-mica schist and lesser calcareous schist, marble, mafic schist, and granitic orthogneiss, exposed along the southern Brooks Range and axis of the Ruby geanticline.","Paleozoic and (or) Precambrian","Early Devonian microfossils were collected from marble in the Wiseman quadrangle (Moore and others, 1997).","U-Pb zircon ages from orthogneisses, which occur in both the Brooks Range and the Ruby geanticline, are Middle Devonian (Aleinikoff and others, 1993; Patton and others, 1987).","Wiseman","Metamorphic",null]