{"text_format":"dbase-jsonl-2026-09-30","columns":[{"name":"NSACLASS","type":"number","width":4,"decimals":0},{"name":"NSAMOD","type":"character","width":7},{"name":"CLASS","type":"number","width":5,"decimals":0},{"name":"MAP_UNIT","type":"character","width":12},{"name":"SOURCE","type":"character","width":5},{"name":"UNIT_NAME","type":"character","width":124},{"name":"DESCRIPTIO","type":"character","width":254},{"name":"AGE","type":"character","width":62},{"name":"FOSSIL","type":"character","width":254},{"name":"RADIOMETRI","type":"character","width":254},{"name":"QUADRANGLE","type":"character","width":16},{"name":"ROCK_CLASS","type":"character","width":14},{"name":"QCLASS","type":"number","width":4,"decimals":0},{"name":"LABEL","type":"character","width":6}],"n_rows":530,"rows_kept":530,"cut":false,"deleted_skipped":0,"read_ended":"whole","bounds":"16MiB/16384/4096/first_that_fit","version":"dbase_level_three","encoding_class":"enc_absent","reader":"statdb_count/9"}
[98,null,98,"unmapped","LC002","Unmapped","High mountain area shown as unmapped in eastern central part of quadrangle",null,null,null,"Lake Clark",null,null,null]
[98,null,534,"unmapped","LC005","Unmapped","Areas of apparent bedrock in lowlands as inferred from air photos.  Scoured by glaciers and may have thin surficial cover.",null,null,null,"Lake Clark",null,2750,null]
[99,null,5099,"bu","DI005","Possible bedrock of unknown character","Areas that air photo interpretation suggest as being underlain by bedrock.  Typically are of higher elevation than surrounding glacial deposits and show hints of structure.  In one case, an apparent strike and dip of bedding is perceptible on air photos.","Unknown",null,null,"Dillingham","Sedimentary",99,"bu"]
[99,null,705,"JQu","KN007","Glacial deposits and volcanic and plutonic rocks, undivided","Glacial deposits and volcanic and plutonic rocks, undivided","Quaternary, Tertiary to Jurrassic",null,null,"Kenai","Igneous",99,null]
[99,null,899,"bu","KN008","Possible bedrock of unknown character","Areas that air photo interpretation suggest as being underlain by bedrock.  Typically are of higher elevation than surrounding glacial deposits and show hints of structure.  In one case, an apparent strike and dip of bedding is perceptible on air photos.","Unknown",null,null,"Kenai","Sedimentary",99,"bu"]
[99,null,599,"bu","LC005","Possible bedrock of unknown character","Areas that air photo interpretation suggest as being underlain by bedrock.  Typically are of higher elevation than surrounding glacial deposits and show hints of structure.  In one case, an apparent strike and dip of bedding is perceptible on air photos.","Unknown",null,null,"Lake Clark","Sedimentary",99,"bu"]
[99,null,600,"?","LC006","Bedrock? of unknown character","Areas on Wes Wallace field compilation that are shown with \"?\"","Unknown",null,null,"Lake Clark",null,99,"bu"]
[99,null,599,"bu","TA015","Undifferentiated bedrock","Areas of apparent bedrock or areas of known bedrock that appear different than surrounding outcrops.  In some cases, this will be areas in otherwise surficial deposits that show unusual high relief or possible bedding.  In areas of known bedrock, this ma",null,null,null,"Taylor Mountains",null,99,null]
[99,null,1999,"bu","TA019","Undifferentiated bedrock","Areas of apparent bedrock or areas of known bedrock that appear different than surrounding outcrops.  In some cases, this will be areas in otherwise surficial deposits that show unusual high relief or possible bedding.  In areas of known bedrock, this ma",null,null,null,"Taylor Mountains",null,99,null]
[100,null,163,"Qu","DI002","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction.","Quaternary",null,null,"Dillingham","Unconsolidated",1000,"Qs"]
[100,null,5100,"Qu","DI005","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction.","Quaternary",null,null,"Dillingham","Unconsolidated",1000,"Qs"]
[100,null,105,"Qs","IL002","Surficial deposits","Unsorted to well-sorted alluvial, colluvial, glacial, glaciofluvial, lacustrine, marine, and eolian deposits","Quaternary (Holocene and Pleistocene)",null,null,"Iliamna","Unconsolidated",1000,"Qs"]
[100,null,100,"Qs","IL006","Surficial deposits","Unsorted to well-sorted alluvial, colluvial, glacial, glaciofluvial, lacustrine, marine, and eolian deposits","Quaternary (Holocene and Pleistocene)",null,null,"Iliamna","Unconsolidated",1000,"Qs"]
[100,null,800,"Qcaf","IL008","Colluvium, alluvium, lacustrine, and floodplain deposits","Colluvium, alluvium, lacustrine, and floodplain deposits","Quaternary (Holocene)",null,null,"Iliamna","Unconsolidated",1000,null]
[100,null,100,"Qs","KN002","Surficial deposits","Surficial deposits","Tertiary (Eocene and Paleocene?)",null,null,"Kenai","Unconsolidated",1000,"Qs"]
[100,null,100,"Qs","KN003","Surficial deposits","Surficial deposits","Tertiary (Eocene and Paleocene?)",null,null,"Kenai","Unconsolidated",1000,"Qs"]
[100,null,707,"none","KN007","Drift River delta","Drift river delta, no description","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",1000,null]
[100,null,800,"Qs","KN008","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced, deposited, and reworked by action of wind, water, glaciers, and frost, including solifluction.  In many areas of the map, this unit is a mixture of surrounding surficial deposit units that could not be rea","Quaternary",null,null,"Kenai","Unconsolidated",1000,null]
[100,null,900,"Qs","KN009","Quaternary surficial deposits","Undivided surficial deposits","Quaternary",null,null,"Kenai","Unconsolidated",1000,null]
[100,null,1100,"Qcaf","KN011","Colluvium, alluvium, lacustrine, and floodplain deposits","Colluvium, alluvium, lacustrine, and floodplain deposits","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",1000,null]
[100,null,1201,"Qs","KN012","Quaternary","Unconsolidated deposits","Quaternary",null,null,"Kenai","Unconsolidated",1000,null]
[100,null,111,"Qu","LC002","Moraine, till, glacial outwash, alluvium, and colluvium, undivided","Terminal and lateral moraines of alpine glaciers, ground moraine and bedrock cored drumlins.  Widespread outwash.","Quaternary",null,null,"Lake Clark","Unconsolidated",1000,"Qs"]
[100,null,500,"Qu","LC005","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction.","Quaternary",null,null,"Lake Clark","Unconsolidated",1000,"Qs"]
[100,null,617,"Q","LC006","Quaternary and unmapped","Undivided Quaternary deposits and unmapped areas.","Quaternary",null,null,"Lake Clark","Unconsolidated",1000,"Qs"]
[100,null,1200,"Q","LC012","Alluvial, colluvial, and glacial deposits","Alluvial, colluvial, and glacial deposits","Quaternary",null,null,"Lake Clark","Unconsolidated",1000,null]
[100,null,82,"Qs","SV002","Surficial deposits","Surficial deposits","Tertiary (Eocene and Paleocene?)",null,null,"Seldovia","Unconsolidated",1000,"Qs"]
[100,null,500,"Qcaf","SV005","Colluvium, alluvium, lacustrine, and floodplain deposits","Colluvium, alluvium, lacustrine, and floodplain deposits","Quaternary (Holocene)",null,null,"Seldovia","Unconsolidated",1000,null]
[100,null,170,"Qu","TA002","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,3170,"Q","TA003","Quaternary deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction. (Added, not in source)","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,4170,"Q","TA004","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,5170,"Q","TA005","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,901,"Q","TA009","Surficial deposits","Includes flood plain, glacial, silt, and gravel deposits.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,1001,"Q","TA010","Surficial deposits","Includes flood plain, glacial, silt, and gravel deposits.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,1101,"Q","TA011","Surficial deposits","Includes flood plain, glacial, silt, and gravel deposits.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,1201,"Q","TA012","Surficial deposits","Includes flood plain, glacial, silt, and gravel deposits.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,5100,"Qs","TA015","Undifferentiated surficial deposits","Mainly unsorted gravel, sand, and silt produced and deposited by action of wind, water, frost, and solifluction.","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,"Qs"]
[100,null,2001,"Qal","TA020","Alluvial deposits","Includes alluvium and glaciofluvial deposits.  Alluvium in minor streams not shown","Quaternary",null,null,"Taylor Mountains","Unconsolidated",1000,null]
[275,null,5275,"Qsb","DI005","Glacially scoured possible bedrock of unknown character","Areas that air photo interpretation suggest as being underlain by bedrock.  Typically are of higher elevation than surrounding glacial deposits and show hints of structure.  In one case, an apparent strike and dip of bedding is perceptible on air photos.","Unknown",null,null,"Dillingham","Sedimentary",2750,"bu"]
[275,null,834,"Qsb","KN008","Scoured bedrock","Glacially scoured bedrock; may be covered with thin glacially derived deposits; air-photo interpretation.","Quaternary",null,null,"Kenai","Unconsolidated",2750,null]
[275,null,534,"Qsb","LC005","Scoured bedrock","Glacially scoured bedrock; may be covered with thin glacially derived deposits; air-photo interpretation.","Quaternary",null,null,"Lake Clark","Unconsolidated",2750,null]
[275,null,5341,"Qsb","LC005","Scoured bedrock","Glacially scoured bedrock; may be covered with thin glacially derived deposits; air-photo interpretation.  Within area of scoured bedrock, appears to be different bedrock.","Quaternary",null,null,"Lake Clark","Unconsolidated",2750,null]
[275,"Q",5275,"Qsb","TA015","Scoured bedrock","Areas of apparent bedrock covered by thin(?) surficial deposits.","Varies",null,null,"Taylor Mountains","Unconsolidated",2750,null]
[300,null,190,"Qv","IL002","Volcanic rocks, undivided","Lava flows and associated pyroclastic rocks associated with Iliamna Volcano","Quaternary",null,null,"Iliamna","Igneous",3000,"Qv"]
[300,null,191,"Qal","IL002","Augustine Volcanics -- Lava flows","Lava flows, chiefly hypersthene-augite andesite and minor dacite and rhyolite on Augustine Volcano.","Quaternary (Holocene and Pleistocene)",null,null,"Iliamna","Igneous",3000,"Qv"]
[300,null,300,"Qv","KN002","Volcanic rocks","Lava, breccia, and associated pyroclastics.  May include Tertiary volcanic rocks","Quaternary (with mixed Tertiary?)",null,null,"Kenai","Igneous",3000,"Qv"]
[300,null,704,"Qv","KN007","Volcanic rocks of Redoubt Volcano","Volcanic rocks of Redoubt Volcano","Quaternary",null,null,"Kenai","Igneous",3000,null]
[300,null,850,"Qv","KN008","Volcanic rocks, undivided","Consists of volcanic rocks and deposits associated with Iliamna, Redoubt, and Double Glacier volcanoes.  Typically restricted to immediate vicinity of these volcanic centers, however locally, debris flows and air-fall material may be somewhat distal.  Lo","Quaternary",null,null,"Kenai","Igneous",3000,"Qv"]
[300,null,1202,"Qv","KN012","Quaternary volcanic rocks","Volcanic rocks of Iliamna and Redoubt volcanoes","Quaternary",null,null,"Kenai","Igneous",3000,null]
[300,null,112,"Qv","LC002","Andesitic lava and tuff of Iliamna Volcano","Light gray andesitic lava and yellowish-gray, opalized tuff.","Quaternary",null,null,"Lake Clark","Igneous",3000,"Qv"]
[300,null,618,"Qv","LC006","Volcanic rocks","Volcanic rocks","Quaternary",null,null,"Lake Clark","Igneous",3000,"Qv"]
[300,null,105,"Qv","SV002","Volcanic rocks, undivided","Lava flows and associated pyroclastic rocks associated with Iliamna Volcano","Quaternary",null,null,"Seldovia","Igneous",300,"Qv"]
[305,null,511,"Qil","IL007","Iliamna Lava flows","Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris","Quaternary",null,null,"Iliamna","Igneous",3050,"Qv"]
[305,null,808,"Qtv","IL008","Lava flows, North and South Twin volcanic center","Lava flows from the North and South Twin volcanic center.  Probably andesitic","Quaternary",null,null,"Iliamna","Igneous",3050,null]
[305,null,511,"Qil","KN005","Iliamna Lava flows","Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris","Quaternary",null,null,"Kenai","Igneous",3050,"Qv"]
[305,null,855,"Hv","KN008","Holocene volcanic rocks","Holocene volcanic rocks, primarily associated with Redoubt Volcano","Quaternary (Holocene)",null,null,"Kenai","Igneous",3050,"Hv"]
[305,null,711,"Qil","LC007","Iliamna Lava flows","Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris.","Quaternary",null,null,"Lake Clark","Igneous",3050,"Qv"]
[305,null,1055,"Qiv","LC010","Lava flows","Lava flows from the present Iliamna volcanic center.  Probably andesitic","Quaternary",null,null,"Lake Clark","Igneous",3050,null]
[305,null,511,"Qil","SV004","Iliamna Lava flows","Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris","Quaternary",null,null,"Seldovia","Igneous",3050,"Qv"]
[305,null,555,"Qtv","SV005","Lava flows, North and South Twin volcanic center","Lava flows from the North and South Twin volcanic center.  Probably andesitic","Quaternary",null,null,"Seldovia","Igneous",3050,null]
[310,null,193,"Qap","IL002","Augustine Volcanics -- Pumice and scoria","Pumice and scoria on Augustine Volcano.","Quaternary (Holocene and Pleistocene)",null,null,"Iliamna","Igneous",3100,"Qpd"]
[310,null,1060,"Qjgdt","LC010","Johnson Glacier dome tephra deposits","Dome tephra","Quaternary",null,null,"Lake Clark","Igneous",3100,null]
[311,null,861,"Qca","KN008","Ash-rich colluvium","Consists of tephra-rich colluvium in the vicinity of and west of Redoubt volcano.  Similar to other volcanoes, these deposits probably consist of ash and larger-sized pyroclasts.  On the flank of Redoubt Volcano, these deposits mantle and are incorporate","Quaternary (Holocene)",null,null,"Kenai","Igneous",3110,null]
[312,null,635,"Qls","KN006","Deposits of Mass Wasting -- landslide deposits","Deposits of landslides, including falls, slumps, slides, and failures by lateral spreading.  Assigned NSA = 312 in vicinity of Polly Creek where this unit consists of debris flows from Mount Redoubt.","Quaternary",null,null,"Kenai","Igneous",3120,"Qls"]
[312,null,703,"Qm","KN007","Debris flow deposits","Debris flow deposits of Crescent River valley.  Includes several small (older?) deposits in the upper valley and the 3,500-year-old debris flow in the lower valley","Quaternary (Holocene)",null,null,"Kenai","Igneous",3120,null]
[312,null,862,"Qdfn","KN008","Debris flow deposits, younger Redoubt flows","Debris flow deposits on the north flank of Redoubt Volcano in the Drift River valley","Quaternary (Holocene)",null,null,"Kenai","Igneous",3122,null]
[312,null,8621,"Qdf2","KN008","Debris flow deposits, older Redoubt flows","Debris flow deposits of North Fork, Crescent River.  Deposits of multiple debris flows off the west and southwest flanks Redoubt Volcano.  Oldest(?) deposit is derived from west flank of Redoubt.  Next oldest deposit appears derived from presently glacia","Quaternary (Holocene)",null,"Radiocarbon date of about 3,500 yrs. BP on youngest and most extensive debris flow.","Kenai","Igneous",3121,null]
[312,null,8622,"Qdf1","KN008","Debris flow deposits, younger Redoubt flows","Debris flow deposits of North Fork, Crescent River.  Deposits of the youngest, most extensive, and probably most fluid debris flow derived from southwest flank of Redoubt Volcano.  Flow was apparently derived from a presently glacier free valley draining","Quaternary (Holocene)",null,"Radiocarbon date of about 3,500 yrs. BP on youngest and most extensive debris flow.","Kenai","Igneous",3122,null]
[312,null,1162,"Ql","KN011","Lahar deposits","Lahar deposits","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",3120,null]
[312,null,5312,"Qdf","LC005","Debris flow deposits","Apparent debris flow deposits of upper Cresecent River valley.  Unusual deposits emanating from valley on east side of Crescent River valley.  Source valley is along extension of normal fault trending to the northeast and having apparent Holocene motion.","Quaternary (Holocene)",null,null,"Lake Clark","Igneous",3120,null]
[313,null,192,"Qar","IL002","Augustine Volcanics -- Volcanic rubble and mudflows","Volcanic rubble and mudflows on Augustrine Volcano.","Quaternary (Holocene and Pleistocene)",null,null,"Iliamna","Igneous",3130,"Qmf"]
[313,null,706,"none","KN007","Areas in Drift River valley subjected to flood scour or deposition by 1966 floods","Areas in Drift River valley subjected to flood scour or deposition by 1966 floods","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",3130,null]
[313,null,708,"pattern","KN007","Areas on Drift River delta subjected to flood scour or deposition prior to 1966","Areas on Drift River delta subjected to flood scour or deposition in the several decades before 1966","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",3130,null]
[313,null,863,"Qdr","KN008","Drift River delta mudflow deposits, undifferentiated","Areas of mudflow deposits, not easily separatable into the Younger and Older events","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",3130,null]
[313,null,8631,"Qdr2","KN008","Older Drift River delta mudflow deposits","Areas of mudflow deposits, tending to be more heavily vegetated and tending to control location of Drift River channels","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",3130,null]
[313,null,8632,"Qdr1","KN008","Younger Drift River delta mudflow deposits prior to 1957","Areas of mudflow deposits, tending to be minimally vegetated and relatively close to channel of Drift River","Quaternary (Holocene)",null,null,"Kenai","Unconsolidated",3130,null]
[314,null,801,"Qda","IL008","Debris-avalanche deposits","Volcanic avalanche deposits consisting of poorly sorted mixture of angular sand, cobbles, and boulders.  All deposits contain clasts of grey andesitic lava and yellow-orange hydrothermally altered rocks.  Estimated age is less than 1,000 years and some m","Quaternary (Holocene)",null,null,"Iliamna","Unconsolidated",3140,null]
[314,null,1164,"Qav","KN011","Volcanic avalanche deposits","Volcanic avalanche deposits consisting of poorly sorted mixture of angular sand, cobbles, and boulders.  All deposits contain clasts of gray andesitic lava and yellow-orange hydrothermally altered rocks.  Estimated age is less than 1,000 years and some m","Quaternary (Holocene)",null,null,"Kenai","Igneous",3140,"Qva"]
[402,null,901,"Qv","KN009","Quaternary volcanic rocks","Composite dome complex consisting of medium- to coarsely porphyritic hornblende andesite and dacite.","Quaternary (Pleistocene)",null,"Three K-Ar whole-rock ages, two considered minimum ages at 627 and 763 ka and one of 887 ka.","Kenai","Igneous",4020,null]
[402,null,1102,"Qjgd","LC010","Johnson Glacier dome complex","Dome complex","Quaternary",null,null,"Lake Clark","Igneous",4020,null]
[450,null,134,"QTv","IL002","Volcanic rocks, undivided","Scoriaceous olivine basalt on Seven Sisters and possibly andesite at West Glacier Creek","Quaterary or Tertiary (Pleistocene or Pliocene)",null,null,"Iliamna","Igneous",4500,"QTv"]
[460,null,531,"QTi","IL007","Basaltic andesite porphyry dikes and sills","Basaltic andesite porphyry dikes and sills","Quaternary and Tertiary",null,null,"Iliamna","Igneous",4600,"QTi"]
[500,null,110,"Ts","IL002","Sedimentary rocks, undivbided","Mainly light- to medium-gray and light-tan, fine- to medium-grained tuffaceous feldspathic to arkosic wacke and siltstone containing scattered pebbles and lenticular beds of pebble conglomerate.  Micaceous clay and silt having moderately abundant glass s","Tertiary (Pliocene or Miocene)","Plant debris and carbonaceous material common but largely unidentifiable or nondiagnostic.  Picea sp. indicating a possibly middle or late Tertiary age.",null,"Iliamna","Sedimentary",null,null]
[540,null,540,"Tks","KN002","Sterling Formation","Sandstone, siltstone, and some coal","Tertiary (Pliocene and Miocene)",null,null,"Kenai","Sedimentary",null,"Tsf"]
[540,null,80,"Ts","SV002","Sterling Formation","Interbedded, weakly lithified sandstone, siltstone, mudstone, carbonaceous shale, lignite coal, and minor volcanic ash.","Tertiary (Pliocene and Miocene)",null,null,"Seldovia","Sedimentary",null,"Tsf"]
[545,null,78,"Tb","SV002","Beluga Formation","Interbedded, weakly lithified sandstone, siltstone, mudstone, carbonaceous shale, coal, and minor volcanic ash.","Tertiary (Miocene)",null,null,"Seldovia","Sedimentary",null,"Tkb"]
[600,null,81,"Tt","SV002","Tyonek Formation","Conglomerate and subordinate sandstone, siltstone, and coal","Tertiary (Miocene and Oligocene)",null,null,"Seldovia","Sedimentary",null,"Tty"]
[630,null,630,"Tkth","KN002","Tyonek Formation and Hemlock Conglomerate (undivided)","Sandstone, conglomerate, and siltstone","Tertiary (Miocene and Oligocene)",null,null,"Kenai","Sedimentary",null,"Ttyh"]
[850,null,111,"Tclu","IL002","Copper Lake Formation -- Upper conglomerate member","Red-weathering pebble-cobble conglomerate consisting mainly of volcanic rock clasts and containing minor tuff.  Unit may be agglomerate rather than conglomerate; ranges from 50 to 100 percent fresh-appearing volcanic rock.  Quartzite, schist, greenstone,","Tertiary (Eocene and Paleocene?)","Sandy interbeds in lower part of unit contain leaves referred to Acer disputabilis Hollick of Eocene (prabable early Eocene) age",null,"Iliamna","Sedimentary",null,"Tcl"]
[850,null,112,"Tcls","IL002","Copper Lake Formation -- Sandstone and siltstone member","Sandy facies is chiefly fine- to medium-grained medium- to greenish-gray, lithic graywacke containing locally abundant tuffaceous and carbonaceous material.  Fragments include abundant quartz, schist, volcanic, and granitic rock fragments.  Interbedded s","Tertiary (Eocene and Paleocene?)",null,null,"Iliamna","Sedimentary",null,"Tcl"]
[850,null,113,"Tcll","IL002","Copper Lake Formation -- Lower conglomerate member","Red-weathering pebble-cobble conglmerate consisting mainly of volcanic rock clasts and containing minor tuff.  Volcanic clasts constitute about 25 percent and appear to be derived for the Talkeetna Formation and not fresher-appearing Tertiary volcanic un","Tertiary (Eocene and Paleocene?)",null,null,"Iliamna","Sedimentary",null,"Tcl"]
[855,"Q",820,"Twf?","KN002","West Foreland Formation","Conglomerate, sandstone, and siltstone; mostly tuffaceous, inferred from air photos, covered by thin glacial deposits","Tertiary (Eocene and Paleocene?)",null,null,"Kenai","Sedimentary",null,"Twf"]
[855,null,855,"Twf","KN002","West Foreland Formation","Conglomerate, sandstone, and siltstone; mostly tuffaceous","Tertiary (Eocene and Paleocene?)",null,null,"Kenai","Sedimentary",null,"Twf"]
[855,null,621,"bT","KN006","Tertiary bedrock","Kenai Group and West Foreland Formation; nonmarine sandstone, siltstone, shale, and claystone and local coal","Tertiary",null,null,"Kenai","Sedimentary",null,"Tk"]
[855,"Q",634,"bT?","KN006","Tertiary bedrock","Kenai Group and West Foreland Formation; nonmarine sandstone, siltstone, shale, and claystone and local coal","Tertiary",null,null,"Kenai","Sedimentary",null,"Tk"]
[855,null,79,"Twf","SV002","West Foreland Formation","Poorly sorted polymictic conglomerate, graywacke, and siltstone; having interbedded tuff and local subaerial basalt flows.","Tertiary (Eocene)",null,null,"Seldovia","Sedimentary",null,"Twf"]
[855,null,513,"Tk","SV004","Kenai Formation","Tan to light-yellow-brown conglomerate, sandstone, and laminated siltstone; few thin coal beds","Tertiary, Miocene and Oligocene?",null,null,"Seldovia","Sedimentary",null,"Twf"]
[1000,null,400,"Tv","DI002","Volcanic(?) rocks","Volcanic rocks based on photo correlation with areas of known volcanic rocks.","Tertiary?",null,null,"Dillingham","Igneous",null,"Tvu"]
[1000,null,5400,"Tv","DI005","Volcanic(?) rocks","Volcanic rocks based on photo correlation with areas of known volcanic rocks.","Tertiary?",null,null,"Dillingham","Igneous",null,"Tvu"]
[1000,null,512,"Tf","IL007","Lava flows","Andesitic to basaltic lavas and associated pyroclastic rocks.","Tertiary, middle to late?",null,null,"Iliamna","Igneous",null,"Tvu"]
[1000,null,512,"Tf","KN005","Lava flows","Andesitic to basaltic lavas and associated pyroclastic rocks.","Tertiary, middle to late?",null,null,"Kenai","Igneous",null,"Tvu"]
[1000,"ALT",2002,"Tda","TA020","Altered diabase(?)","Includes slightly altered to completely altered diabase and biotite basalt","Tertiary?",null,null,"Taylor Mountains","Igneous",null,null]
[1001,null,1131,"Tv","LC002","Volcanic rocks","Rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic and intermediate flows.  Unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Formation","Tertiary",null,"K-Ar ages of 56.2 to 62.7 Ma, however unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Formation.","Lake Clark","Igneous",null,"Trs"]
[1003,null,115,"Tvf","LC002","Mafic to intermediate flows","Mafic to intermediate flows of unit Tv where they constitute separate mappable entities.  Unit split into flows likely to be part of the Meshik Arc and assigned an NSACLASS of 1082 and the less certain age unit which are assigned NSACLASS of 1003","Tertiary",null,null,"Lake Clark","Igneous",null,"Ta"]
[1003,null,5004,"Tvf","LC005","Mafic to intermediate flows","Mafic to intermediate flows of unit Tv where they constitute separate mappable entities.Unit split into flows likely to be part of the Meshik Arc and assigned an NSACLASS of 1082 and the less certain age unit which are assigned NSACLASS of 1003","Tertiary",null,null,"Lake Clark","Igneous",null,"Ta"]
[1011,null,0,"Td","SV002","Intermediate, felsic and mafic dikes","Dikes of dacite, rhyolite, andesite, and rare basalt; stored in coverage as arcs, arc-code = 50, arc-para1 = 0","early Tertiary",null,"Ar-AR isochron(?) age on andesite(?) of 57.0 Ma","Seldovia","Igneous",null,"Thf"]
[1011,null,200,"Tf","TA003","Felsic porphyry","Felsic porphyry","Tertiary",null,null,"Taylor Mountains","Igneous",null,"Tdi"]
[1011,null,9200,"P","TA019","Felsic porphyry","Felsic porphyry","Tertiary",null,null,"Taylor Mountains","Igneous",null,"Tdi"]
[1012,null,1012,"none","IL002","Volcanic necks, sills, and dikes","Spires of basalt and diabase representing the solidified core or vent of Tertiary volcanoes.  (NOTE, this is not a map unit. but is shown using a special symbol on the map)","Tertiary",null,null,"Iliamna","Igneous",null,"Thm"]
[1025,null,170,"Tib","IL002","Intricate Basalt","Glassy to porphyritic black to dark-green olivine-augite basalt, largely in the vicinity of Intricate Bay, but also occurs south of Gibraltar Lake","Tertiary (Pliocene)",null,null,"Iliamna","Igneous",null,"Tib"]
[1025,null,192,"Tw","TA002","Basalt","Basalt and locally diabasic intrusive rocks","late Tertiary",null,"K-Ar ages of 4.62 and 4.72 Ma","Taylor Mountains","Igneous",null,null]
[1025,null,192,"QTb","TA003","Basalt","Basalt and locally diabasic intrusive rocks","late Tertiary",null,"K-Ar ages of 4.62 and 4.72 Ma","Taylor Mountains","Igneous",null,null]
[1025,null,1202,"v","TA012","Extrusive igneous rocks","Olivine basalt flows","Tertiary",null,null,"Taylor Mountains","Igneous",null,null]
[1025,null,5025,"Tb","TA015","Extrusive igneous rocks","Olivine basalt flows","late Tertiary",null,null,"Taylor Mountains","Igneous",null,null]
[1025,null,9025,"Tb","TA019","Extrusive igneous rocks","Olivine basalt flows","late Tertiary",null,null,"Taylor Mountains","Igneous",null,null]
[1030,null,141,"Tglu","IL002","Gibraltar Lake Tuff -- Upper member","Light-gray to white crystal ash-flow tuff.  Maximum thickness of 152 to 182 m","Tertiary (Pliocene?)",null,null,"Iliamna","Igneous",null,"Tpgu"]
[1031,null,142,"Tgll","IL002","Gibraltar Lake Tuff -- Lower member","Light- to medium-gray and tan rhyolitic crystal and lithic welded tuff and local interbedded porphyritic rhyolite flows","Tertiary (Pliocene? to Oligocene?)",null,null,"Iliamna","Igneous",null,"Tpgl"]
[1070,null,5070,"Tvt","DI005","Volcanic rocks, undivided, tuff","Gray and purple bedded lithic, crystal, and vitric tuff; light-gray to purple welded crystal and lithic tuff most common.  Sample collected along Alagnak River by Janet Curran, USGS-WRD","Tertiary (Oligocene and older?)",null,"40Ar/39Ar age on plagioclase of 41.6 Ma","Dillingham","Igneous",null,"Tvr"]
[1070,null,5615,"Tft","DI005","Felsic volcanic rocks, tuff(?)","Cream to light-gray to green layered volcanic rocks.  Layering suggests rocks are tuffaceous.","early Tertiary",null,null,"Dillingham","Igneous",null,"Tvr"]
[1070,null,116,"Tvt","IL002","Volcanic rocks, undivided, tuff","Gray, green, and purple bedded lithic, crystal, and vitric tuff; light-gray to tan welded crystal and lithic tuff most common.","Tertiary (Oligocene and older?)",null,null,"Iliamna","Igneous",null,"Tvr"]
[1070,null,51070,"Tvt","LC005","Volcanic rocks","Rhyolitic breccia, ash-flow tuff, and flows. Cream, light-gray, green, and purple bedded lithic, crystal, and vitric tuff; light-gray to tan welded crystal and lithic tuff most common","Tertiary",null,"K-Ar ages of 41.6 ro 45.1 Ma, in adjacent quadrangles","Lake Clark","Igneous",null,null]
[1081,null,5081,"Tvba","DI005","Volcanic rocks, undivided, basalt and andesite","Dark-gray to green glassy to porphyritic basaltic andesite and andesite lava flows.  Locally, basalt, dacite, and rhyolite are common.  Many of the rocks are associated with eruptive centers.  Unit inferred from adjacent Iliamna quadrangle geologic map.","Tertiary (Oligocene and older?)",null,null,"Dillingham","Igneous",null,"Tm"]
[1081,null,114,"Tv","IL002","Volcanic rocks, undivided","Includes basalt, andesite, tuff, volcanic rubble, and breccia","Tertiary (Oligocene and older?)",null,null,"Iliamna","Igneous",null,"Tvu"]
[1081,null,113,"Tv","LC002","Volcanic rocks","Rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic and intermediate flows.  Unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Formation","Tertiary",null,"K-Ar ages of 56.2 to 62.7 Ma, however unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Formation.","Lake Clark","Igneous",null,"Trs"]
[1081,null,5000,"Tv","LC005","Volcanic rocks","Undifferentiated volcanic mafic and felsic flows, tuff flow breccias.  Interpreted from air photos","Tertiary",null,null,"Lake Clark","Igneous",null,"Tvu"]
[1081,null,5001,"Tv","LC005","Volcanic rocks","Rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic and intermediate flows.  Unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Fm.  Interpreted from airphotos","Tertiary",null,"K-Ar ages of 56.2 to 62.7 Ma, however unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Fm.","Lake Clark","Igneous",null,"Trs"]
[1081,null,5011,"Tf","TA015","Felsic porphyry","Felsic porphyry","Tertiary",null,null,"Taylor Mountains","Igneous",null,"Tdi"]
[1082,null,115,"Tvba","IL002","Volcanic rocks, undivided, basalt and andesite","Dark-gray to green glassy to porphyritic basaltic andesite and andesite lava flows.  Locally, basalt, dacite, and rhyolite are common.  Many of the rocks are associated with eruptive centers.","Tertiary (Oligocene and older?)",null,null,"Iliamna","Igneous",null,"Tm"]
[1082,null,114,"Tvf","LC002","Mafic to intermediate flows","Mafic to intermediate flows of unit Tv where they constitute separate mappable entities.  Unit split into flows likely to be part of the Meshik Arc and assigned an NSACLASS of 1082 and the less certain age unit which are assigned NSACLASS of 1003","Tertiary",null,null,"Lake Clark","Igneous",null,"Ta"]
[1082,null,5003,"Tvf","LC005","Mafic to intermediate flows","Mafic to intermediate flows of unit Tv where they constitute separate mappable entities.  Unit split into flows likely to be part of the Meshik Arc and assigned an NSACLASS of 1082 and the less certain age unit which are assigned NSACLASS of 1003.  Infer","Tertiary",null,null,"Lake Clark","Igneous",null,"Ta"]
[1084,null,5403,"Ta","DI005","Andesite plug","Small andesite plug intruding hornfelsed siltstone.  Contact metamorphism is not associated with andesite plug.  Also includes isolated andesite plug in southeast corner of D-1 quadrangle.","Tertiary?",null,null,"Dillingham","Igneous",null,"Ta"]
[1087,null,117,"Tvr","IL002","Volcanic rocks, undivided, volcanic rubble and breccia","Volcanic rubble and breccia, including some agglomerate; may include deposits of lahars.","Tertiary (Oligocene and older?)",null,null,"Iliamna","Igneous",null,"Tm"]
[1111,null,5404,"Tbb","DI005","Olivine basalt","Massive columnar jointed olivine basalt flows in the area east of the Stuyahok Hills; part of bimodal volcanic suite.  The sequence consists of interlayered basalt flows and felsic tuff.  Flows range from 3 to 10 m thick. SiO2 content is approximately 48","Tertiary?",null,"Ar-Ar age of 44 Ma","Dillingham","Igneous",null,"Tbep"]
[1112,null,5401,"Tbr","DI005","Bimodal volcanic suite, rhyolitic and dacitic tuff","Distinctive light colored horizons of felsic tuff interlayered with olivine basalt in the Stuyahok Hills.  Tuff composed largely of altered glass and very fresh phenocrysts of plagioclase.  Tuff layers approximately 10 to 30 m thick.  Age is approximatel","Tertiary (Eocene)",null,"Ar-Ar age of 44 Ma","Dillingham","Igneous",null,"Trs"]
[1125,null,5405,"Tbo","DI005","Olivine basalt","Massive columnar jointed olivine basalt flows in the southwestern D-1 quadrangle (T.4 S., R.41 W.); overlies alaskite (unit TKga) and graywacke of probable Jurassic age (unit Jkw).  Newly determined Ar-Ar isochron age is 53.70 +/- 0.62 Ma.  SiO2 content","Tertiary (early Eocene)",null,"Ar-Ar age of 53.70 +/- 0.62 Ma","Dillingham","Igneous",null,"Tbep"]
[1130,null,6002,"Tvi","DI005","Ignimbrite","Crystal tuff containing variable amounts of biotite and feldspar crystals in a tuffaceous matrix.  Unit is widespread in the Stuyahok Hills and varies in appearance from crystal tuff to porphyritic plutonic rock.  However in all cases, the groundmass is","Tertiary (Paleocene)",null,"Wallace and others (1989, DI006) report K-Ar age of 57.9 Ho, and 58.6 Bi; new Ar-Ar ages tightly cluster at 59 Ma","Dillingham","Igneous",null,"Tvig"]
[1200,null,1200,"Ti","KN002","Intrusive rocks","Dikes, sills, and stock-lke masses of felsic to mafic composition","Tertiary",null,null,"Kenai","Igneous",null,"Tiu"]
[1200,null,620,"Tg","LC006","Granitic rocks","Granitic rocks","Tertiary",null,null,"Lake Clark","Igneous",null,"Tiu"]
[1203,null,133,"Ti13","LC002","Tertiary intrusive rocks -- Unit 13 Granite","Multiphase, hypabyssal leucocratic grayish-pink biotite granite","Tertiary",null,null,"Lake Clark","Igneous",null,"Thf"]
[1203,null,138,"Ti18","LC002","Tertiary intrusive rocks -- Unit 18 Granite","Small area of fractured biotite granite containing as much as 40 percent potassium-feldspar.","Tertiary",null,null,"Lake Clark","Igneous",null,"Togr"]
[1203,null,139,"Ti19","LC002","Tertiary intrusive rocks -- Unit 19 Aplite","Light-gray, fine-grained xenomorphic granular aplite stock.  Younger than Ti -- unit 17.","Tertiary",null,null,"Lake Clark","Igneous",null,"Togr"]
[1205,null,151,"Ti","IL002","Intrusive rocks","Fine- to medium-grained granodiorite and quartz diorite, includes volcanic necks, sills, and dikes.","Tertiary",null,null,"Iliamna","Igneous",null,"Tgd"]
[1275,null,150,"Tqd","IL002","Quartz Diorite","Coarse-grained, light-gray hornblende-biotite quartz diorite.","Tertiary (Oligocene)",null,"36 Ma","Iliamna","Igneous",null,"Toqd"]
[1275,null,126,"Ti6","LC002","Tertiary intrusive rocks -- Unit 6 Quartz monzodiorite","Small irregular body of quartz monzodiorite cutting metamorphic rocks and containing abundant mafic inclusions.","Tertiary",null,null,"Lake Clark","Igneous",null,"Toem"]
[1275,"ALT",134,"Ti14","LC002","Tertiary intrusive rocks -- Unit 14 Quartz monzodiorite","Heterogeneous, intensely sheared and locally altered medium- to fine-grained rocks ranging from tonalite to monzodiorite.  Intruded by Ti unit 13 and intrudes Mesozoic metavolcanic rocks.","Tertiary",null,null,"Lake Clark","Igneous",null,"Taqd"]
[1275,null,135,"Ti15","LC002","Tertiary intrusive rocks -- Unit 15 Tonalite","Compositionally variable medium-grained, slightly foliated tonalite and quartz diorite","Tertiary",null,"K-Ar ages between 31 to 35 Ma","Lake Clark","Igneous",null,"Tqd"]
[1275,null,136,"Ti16","LC002","Tertiary intrusive rocks -- Unit 16 Granodiorite","Medium-gray, medium-grained hypidiomorphic-granular biotite-hornblende granodiorite.  According to Reed and Lanphere, is part of Merrill Pass sequenceBiotite granite and biotite-hornblende granite and granodiorite.  Possibly two population, uniformly gra","Tertiary",null,"K-Ar ages between 31 to 35 Ma","Lake Clark","Igneous",null,"Toem"]
[1300,null,124,"Ti4","LC002","Tertiary intrusive rocks -- Unit 4 Granodiorite","Medium- to coarse-grained biotite-hornblende granodiorite.","Tertiary",null,null,"Lake Clark","Igneous",null,"Tegr"]
[1300,null,132,"Ti12","LC002","Tertiary intrusive rocks -- Unit 12 Granite and granodiorite","North of Currant Creek, consist of grayish-white coarse-grained biotite granite; south of Currant Creek consist of medium- to coarse-grained granodiorite.","Tertiary",null,null,"Lake Clark","Igneous",null,"Tegr"]
[1300,null,137,"Ti17","LC002","Tertiary intrusive rocks -- Unit 17 Granite","Biotite granite and biotite-hornblende granite and granodiorite.  Possibly two populations, uniformly grayish-white, coarse-grained biotite granite containing light-pink perthite phenocrysts north of Township 9 N.  In T. 9 N and southward, rocks are less","Tertiary",null,"K-Ar ages between 35 and 41 Ma","Lake Clark","Igneous",null,"Tegr"]
[1300,null,5300,"Ti17","LC005","Tertiary intrusive rocks -- Unit 17 Granite","Biotite granite and biotite-hornblende granite and granodiorite.  Possibly two populations, uniformly grayish-white, coarse-grained biotite granite containing light-pink perthite phenocrysts north of Township 9 N.  In T. 9 N and southward, rocks are less","Tertiary",null,"K-Ar ages between 35 and 41 Ma","Lake Clark","Igneous",2750,"Tegr"]
[1300,null,113,"Tg","SV002","Granodiorite","Medium- and coarse-grained biotite granodiorite","Tertiary (Eocene)",null,"U-Pb monazite age of 56.0, Ar-Ar biotite ages of 54.2, 53.2, 53.4,53.7, and 54.0","Seldovia","Igneous",null,"Tegr"]
[1318,null,125,"Ti5","LC002","Tertiary intrusive rocks -- Unit 5 Gabbronorite","Small, coarse-grained stock of hornblende and biotite-bearing olivine gabbronorite cutting Mesozoic sedimentary rocks.","Tertiary",null,null,"Lake Clark","Igneous",null,"Tgl"]
[1320,null,630,"Ti10","IL006","Tertiary intrusive rocks -- Unit 10 Granite","Medium-grained composite pluton of granite and granodiorite which forms western border of Alaska-Aleutian Range batholith from Little Lake Clark southwestward into the Ilianma quadrangle.","Tertiary",null,null,"Iliamna","Igneous",null,"Tpgr"]
[1320,null,127,"Ti7","LC002","Tertiary intrusive rocks -- Unit 7 Granite","Coarse- to medium-grained granite.","Tertiary",null,null,"Lake Clark","Igneous",null,"Thgd"]
[1320,null,130,"Ti10","LC002","Tertiary intrusive rocks -- Unit 10 Granite","Medium-grained composite pluton of granite and granodiorite which forms western border of Alaska-Aleutian Range batholith from Little Lake Clark southwestward into the Ilianma quadrangle.","Tertiary",null,null,"Lake Clark","Igneous",null,"Tpgr"]
[1320,null,131,"Ti11","LC002","Tertiary intrusive rocks -- Unit 11 Granodiorite","Medium-grained composite body largely of granodiorite but including granite and quartz monzodiorite.  Locally includes rocks of Ti10.","Tertiary",null,null,"Lake Clark","Igneous",null,"Tegr"]
[1325,null,123,"Ti3","LC002","Tertiary intrusive rocks -- Unit 3 Peralkaline granite","Mostly medium-grained hypidiomorphic granular granite containing subhedral to euhedral perthite.  Only peralkaline granite associated with Alaska-Aleutian Range bathoilth and probably not related to calc-alkaline rocks of the batholith.","Tertiary",null,null,"Lake Clark","Igneous",null,"Togr"]
[1350,null,629,"Ti9","IL006","Tertiary intrusive rocks -- Unit 9 Granodiorite","Medium-grained, equigranular hornblende-biotite granodiorite.  Intrudes Jurassic unit 2.","Tertiary",null,null,"Iliamna","Igneous",null,"Thgd"]
[1350,null,121,"Ti1","LC002","Tertiary intrusive rocks -- Unit 1 Granodiorite","Compositionally variable, medium-grained hypidiomorphic granular igneous rock, which depending on perthite content ranges from granodiorite to tonalite.","Tertiary",null,"Concordant K-Ar age of  61 Ma","Lake Clark","Igneous",null,"Thgd"]
[1350,null,122,"Ti2","LC002","Tertiary intrusive rocks -- Unit 2 Quartz monzodiorite","Medium- to fine-grained hypidiomorphic granular hornblende-biotite quartz monzodiorite.  Cut by Ti unit 10.","Tertiary",null,"Concordant K-Ar age of  61 Ma","Lake Clark","Igneous",null,"Thgd"]
[1350,null,128,"Ti8","LC002","Tertiary intrusive rocks -- Unit 8 Granodiorite","Largely medium-grained, equigranular hornblende-biotite silicic granodiorite but ranges from granite to quartz monzodiorite.  Intrudes Jurassic and Cretaceous rocks of Alaska-Aleutian Range batholith.","Tertiary",null,null,"Lake Clark","Igneous",null,"Thgd"]
[1350,null,129,"Ti9","LC002","Tertiary intrusive rocks -- Unit 9 Granodiorite","Medium-grained, equigranular hornblende-biotite granodiorite.  Intrudes Jurassic unit 2.","Tertiary",null,null,"Lake Clark","Igneous",null,"Thgd"]
[1600,null,623,"TKv","LC006","Volcanic rocks","Volcanic rocks","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKv"]
[1600,"Q",624,"TKv?","LC006","Volcanic rocks","Volcanic rocks","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKv"]
[1600,null,1205,"TKp","LC012","Tuff, tuff breccia, and breccia","Compositionally undetermined tuff, tuff breccia, and breccia","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1602,null,5011,"Ti","DI005","Felsic hypabyssal rocks","The larger of scattered occurrences of felsic hypabyssal rocks.  Occurs as dikes and small plugs.","Tertiary?",null,null,"Dillingham","Igneous",null,"Thf"]
[1602,null,147,"TKi7","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 7 Rhyolite dikes","Rhyolite dikes containing phenocrysts of sanidine and high temperature quartz.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgp"]
[1602,null,1914,"TKr","TA019","Hypabyssal intrusive igneous rocks","Dikes, sills, and small plugs are primarily porphyritic rhyolite.","Tertiary",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1603,null,5603,"TKr","LC005","Rhyolite flows and tuff","Rhyolite flows and tuff, includes some dikes.  Inferred on basis of Eakins and others (1978).","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1603,null,1201,"TKr","LC012","Rhyolite flows and tuff","Rhyolite flows and tuff, includes some dikes","Tertiary or Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1603,"ALT-SER",1202,"TKr","LC012","Rhyolite flows and tuff","Rhyolite flows and tuff, includes some dikes","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1604,null,5603,"TKd","LC005","Dacite flows and pyroclastic rocks","Dacite flows and pyroclastic rocks, includes some hypabyssal intrusions.  Added from air-photos","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1604,null,1203,"TKd","LC012","Dacite flows and pyroclastic rocks","Dacite flows and pyroclastic rocks, includes some hypabyssal intrusions","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1635,null,5635,"TKb","LC005","Basalt flows","Basalt flows.  Added from air-photos","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1635,null,1204,"TKb","LC012","Basalt flows","Basalt flows","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1650,null,1203,"TKu","KN012","Plutonic rocks, undivided","Plutonic rocks","Tertiary and Cretaceous",null,null,"Kenai","Igneous",null,null]
[1650,null,1103,"TKu","LC011","Plutonic rocks, undivided","Plutonic rocks","Tertiary and Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1655,null,165,"TKg","DI003","Granitic rocks","Fine-, medium-, and coarse-grained, light- to dark-gray, rarely pink, plutonic granitic rocks.  Chiefly quartz monzonite, granodiorite, and quartz diorite.","Tertiary and Cretaceous",null,"K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblende","Dillingham","Igneous",null,"TKg"]
[1655,null,5165,"TKg","DI005","Granitic rocks","Fine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks.  Chiefly quartz monzonite, granodiorite, and quartz diorite.  In general, alkali content of these rocks is high relative to normal for their SiO2 content (LeMai","Tertiary and Cretaceous",null,"K-Ar and 40Ar-39Ar ages range from 61 to 67 Ma from biotite and hornblende","Dillingham","Igneous",null,"TKg"]
[1655,"HFS",5170,"TKgm","DI009","Granitic rocks and mixed hornfels and dikes","Fine-, medium-, and coarse-grained, light- to dark-gray, plutonic granitic rocks mixed with felsic dikes and contact metamorphosed volcanic or sedimentary rocks.  Outcrop area is south of the Northern pluton, at much lower elevation, suggesting that it m","Tertiary and Cretaceous",null,"65.26 +/- 0.06 Ma on biotite","Dillingham","Igneous",null,"TKg"]
[1655,null,5655,"TKg","LC005","Granitic rocks of Tertiary and (or) Cretaceous age","Granitic rocks","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKg"]
[1655,null,621,"TKg","LC006","Granitic rocks","Granitic rocks","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKg"]
[1655,null,622,"TKg?","LC006","Granitic rocks","Granitic rocks","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKg"]
[1655,null,165,"TKg","TA006","Granitic rocks","Fine-, medium-, and coarse-grained, light- to dark-gray, rarely pink plutonic granitic rocks.  Chiefly quartz monzonite, granodiorite, and quartz diorite.","Tertiary and Cretaceous",null,"K/Ar age range of 62.5 to 72.5 m.y. from biotite and hornblende","Taylor Mountains","Igneous",null,"TKg"]
[1655,null,5055,"TKg","TA015","Granitic rocks","Granitic rocks.","Tertiary or Cretaceous",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1655,null,1912,"TKg","TA019","Intrusive igneous rocks","Primarily granite but ranges in composition from diorite to granite.  Dikes sills, and small plugs are primarily porphyritic rhyolite.","Tertiary",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1656,null,5176,"TKg","DI005","Granitic rocks, Kemuk pluton","Coarse-grained pyroxene alkali-feldspare granite.  Consists primarily of perthitic feldspar grains surrounded by a fine-grained matric of quartz and feldspar.  Contains biotite, pyroxene, and amphibole.","Tertiary or Cretaceous",null,"40Ar-39Ar age of 64.45+/- 0.11","Dillingham","Igneous",null,"TKg"]
[1656,null,5178,"TKg","DI005","Granitic rocks","The Akuluktuk and Tikchik Lake plutons of Wilson and others, 1977.  Medium- to Coarse-grained granite, biotite dominant but containing minor amphibole or clinopyroxene.","Tertiary and Cretaceous",null,"K-Ar and 40Ar-39Ar ages range from 69.7 to 63.4 Ma on biotite and hornblende","Dillingham","Igneous",null,"TKg"]
[1656,null,5166,"TKgs","DI009","Granitic rocks of the eastern Stuyahok Hills","Largely medium- to coarse-grained, light-gray to pinkish biotite monzogranite.  Large pluton widely exposed in the eastern part of the Stuyahok Hills.  Typically contains large (2cm) phenocrysts of potassium feldspar (orthoclase).  Biotite is dominant ma","Tertiary and Cretaceous",null,"K-Ar ages reported by Wallace and others (1989) are 61.2 +/- 1.8 Ma (biotite) and 54.5 +/- 1.6 Ma (hornblende, minimum age).  Ten newly determined 40Ar-39Ar ages on biotite are tightly grouped between 60.90 +/- 0.04 and 61.70 +/- 0.06 Ma and an 40Ar-39Ar","Dillingham","Igneous",null,"TKg"]
[1656,null,5168,"TKga","DI009","Alaskite","Coarse- to fine-grained white to off-white alaskite (alkali-feldspar granite) consisting of white feldspar and smoky quartz.  Mafic minerals and mica exceedingly sparse in this large (7 km in diameter) body on the southwestern edge of the D-1 quadrangle.","Tertiary?",null,"An Ar-Ar age determination on biotite yielded 66.64 +/- 0.08 Ma whereas a plateau age of potassium feldspar was 58.2 +/- 0.2 Ma, slightly older that the overlying olivine basalt (unit Tbo, 53.7 Ma) suggesting extended cooling or resetting associated with","Dillingham","Igneous",null,"TKg"]
[1656,null,150,"TKi10","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 10 Granite prophyry","Hypidiomorphic-granular granite prophyry having quartz, plagioclase and potassium feldspar phenocrysts to 4 mm in a groundmass of 1 mm plagioclase.  Very little biotite, local muscovite and zircon.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKg"]
[1656,null,151,"TKi11","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 11 Granite","Medium-grained, xenomorphic granite, subequal biotite and hornblende.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKg"]
[1656,null,190,"Tg","TA002","Granitic rocks","Granite of Taylor Mountain batholith","Tertiary?",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1656,null,3190,"TKg","TA003","Granitic rocks","Granite, porphyritic granite, and dikes and sills of rhyolite.","Tertiary?",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1656,null,190,"Tg","TA005","Granitic rocks","Granite, porphyritic granite, and dikes and sills of rhyolite.","Tertiary?",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1656,null,902,"i","TA009","Intrusive igneous rocks","Primarily quartz monzonite stock but ranges in composition from grandiorite to granite.  Dikes sills, and small plugs are primarily porphyritic rhyolite.","Tertiary",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1656,null,14190,"TKg","TA014","Granitic rocks","Granitic rocks.","Tertiary or Cretaceous",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1656,null,5056,"TKg","TA015","Granitic rocks","Granite","Tertiary or Cretaceous",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1657,null,450,"Tg","DI002","Granitic rocks","Coarse- to fine-grained grantic rocks consisiting in part of quartz monzonite and syenite.","Tertiary?",null,null,"Dillingham","Igneous",null,"TKg"]
[1657,null,5177,"TKg","DI005","Granitic rocks, Kulik Lake pluton","Medium-grained pyroxene monzonite.  Contains biotite and pyroxene","Tertiary or Cretaceous",null,null,"Dillingham","Igneous",null,"TKg"]
[1657,null,5172,"TKgn","DI009","Northern pluton","Medium-grained biotite monzogranite to syenogranite found in the mountains immediately south of the Koktuli River.  Biotite is the only mafic mineral and orthoclase has moderate development of string perthite.  SiO2 of analyzed samples has a narrow range","Tertiary or Cretaceous",null,"Ar-Ar ages range between 65.50 +/- 0.05 and 66.24 +/- 0.08 Ma on biotite.","Dillingham","Igneous",null,"TKg"]
[1657,null,5057,"TKg","TA015","Granitic rocks","Syenitic rocks","Tertiary or Cretaceous",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1658,null,5165,"TKg","DI005","Quartz monzodiorite of the Muklung Hills","Quartz monzodiorite but also includes granite in this large multi-phase pluton.  Large zoned, twinned and untwin feldspar phenocrysts in a fine-grained matrix of quartz, feldspar, biotite, and hornblende.","Tertiary and Cretaceous",null,"40Ar-39Ar ages range from 65.81 to 67.94 Ma from biotite","Dillingham","Igneous",null,"TKg"]
[1658,null,5167,"TKpsw","DI009","Pike Creek plutons, southwestern unit","Medium- to coarse-grained, light-gray biotite monzogranite or quartz monzodiorite.  Equigranular and contains more pyroxene than unit TKpnw above.  Clinopyroxene, some of which containing pinkish orthopyroxene cores is common in some samples, whereas oth","Tertiary and Cretaceous",null,"Ar-Ar biotite ages are 61.11 +/- 0.07 and 61.67 +/- 0.05 Ma","Dillingham","Igneous",null,"TKg"]
[1658,null,5169,"TKpe","DI009","Pike Creek plutons, eastern unit","Medium-grained, light-gray biotite monzogranite to quartz monzonite.  Hornblende to biotite ratio approximately 6:4; may contain orthoclase phenocrysts and hornblende may have relict clinopyroxene cores.  Major element chemical analysis indicates 63.2 pe","Tertiary and Cretaceous",null,"Ar-Ar age of 63.09 +/- 0.05 Ma on biotite","Dillingham","Igneous",null,"TKg"]
[1658,null,5171,"TKgnw","DI009","Northwest pluton","Porphyritic amphibole-bearing monzonite.  Outcrops on isolated low-relief ridge south of the Koktuli River and west of the Northern pluton.  Consists of plagioclase, amphibole (kaersutite?) , and clinopyroxene phenocrysts in a fine-grained groundmass.  S","Tertiary or Cretaceous",null,"Ar-Ar plateau age was 63.76 +/- 0.27 Ma on amphibole","Dillingham","Igneous",null,"TKg"]
[1658,null,5173,"TKpnw","DI009","Pike Creek plutons, northwestern unit","Medium-grained, light-gray hornblende-biotite monzogranite to quartz monzodiorite.  May contain large phenocrysts of orthoclase; biotite to hornblende ratio approximately 2:1. Two major element chemical analyses have 67.8 and 68.2 percent SiO2.","Tertiary and Cretaceous",null,"Ar-Ar biotite ages are 65.72 +/- 0.04 and 66.49 +/- 0.07 Ma","Dillingham","Igneous",null,"TKg"]
[1658,null,5174,"TKge","DI009","Eastern granitic rocks-Hornblende quartz monzonite","Hornblende quartz monzonite.  Texturally similar to the granitic rocks of the eastern Stuyahok Hills in having large (2 cm) feldspar phenocrysts, however hornblende is the more common mafic mineral in these rocks.  An 40Ar-39Ar age of 61.3 +/- 0.2 Ma on","Tertiary and or Cretaceous",null,"40Ar-39Ar age of 61.3 +/- 0.2 Ma on hornblende","Dillingham","Igneous",null,null]
[1658,null,145,"TKi5","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 5 Quartz monzonite","Numerous small intrusive bodies of quartz monzonite in the central part of the quadrangle indentified by Eakins and others (1978)","Tertiary and (or) Cretaceous",null,"K-Ar age of 71.3 Ma on one body located in T.5N, R.30W.","Lake Clark","Igneous",null,"TKg"]
[1658,null,1206,"TKqm","LC012","Quartz monzonite","Quartz monzonite and minor granodiorite","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1658,null,191,"Tqm","TA002","Quartz monzonite","Quartz monzonite.","Tertiary or Cretaceous",null,"K-Ar age of 67.1 Ma on amphibole","Taylor Mountains","Igneous",null,"TKg"]
[1658,null,1002,"i","TA010","Intrusive igneous rocks","Primarily quartz monzonite stock but ranges in composition from granodiorite to granite.  Dikes sills, and small plugs are primarily porphyritic rhyolite.","Tertiary",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1658,null,1102,"i","TA011","Intrusive igneous rocks","Primarily quartz monzonite stock but ranges in composition from grandiorite to granite.  Dikes sills, and small plugs are primarily porphyritic rhyolite.","Tertiary",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1658,null,1203,"i","TA012","Intrusive igneous rocks","Primarily quartz monzonite stock but ranges in composition from grandiorite to granite.  Dikes sills, and small plugs are primarily porphyritic rhyolite.","Tertiary",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1660,null,152,"TKi","IL002","Intrusive rocks","Chiefly medium- to coarse-grained, light-gray granodiorite, quartz monzonite, and quartz diorite plutons.","Tertiary or Cretaceous",null,null,"Iliamna","Igneous",null,"TKgd"]
[1660,null,653,"TKi13","IL006","Tertiary and (or) Cretaceous intrusive rocks -- Unit 13 Granodioritic rocks","Light-colored intrusive rocks, presumed granodiorite.","Tertiary and (or) Cretaceous",null,null,"Iliamna","Igneous",null,"TKgd"]
[1660,null,2905,"TKgd","KN002","Granodiorite, quartz diorite, and diorite",null,"Tertiary or Late Cretaceous",null,null,"Kenai","Igneous",null,"TKm"]
[1660,null,142,"TKi2","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 2 Granodiorite","Medium- to locally fine-grained hypidiomorphic-granular, pinkish-gray granodiorite.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1660,null,144,"TKi4","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 4 Granodiorite","Medium- to fine-grained, light-pinkish-gray hornblende-biotite granodiorite.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1660,null,149,"TKi9","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 9 Granodiorite","Coarse- to fine-grained, hypidiomorphic-seriate textured granodiorite.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1660,null,152,"TKi12","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 12 Granodioritic rocks","Light-colored intrusive rocks, presumed granodiorite.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1660,null,153,"TKi13","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 13 Granodioritic rocks","Light-colored intrusive rocks, presumed granodiorite.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1660,null,154,"TKi14","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 14 Granodiorite","Medium-grained, hypidiomorphic granular, seriate granodiorite  Biotite more abundant that hornblende.","Tertiary and (or) Cretaceous",null,"K-Ar age of  64 Ma","Lake Clark","Igneous",null,"TKgd"]
[1660,"Q",5660,"TKi9","LC005","Tertiary and (or) Cretaceous intrusive rocks -- Unit 9 Granodiorite","Coarse- to fine-grained, hypidiomorphic-seriate textured granodiorite..  added from airphotos","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1660,null,5661,"TKi12","LC005","Tertiary and (or) Cretaceous intrusive rocks -- Unit 12 Granodioritic rocks","Light-colored intrusive rocks, presumed granodiorite.  Added from air photos","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1660,null,192,"Tg","TA002","Granitic rocks","Granodiorite or tonalite based on analysis and thin-sections (54AHr 10)","Tertiary?",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1660,null,5060,"TKgd","TA015","Granitic rocks","Granodiorite or tonalite","Tertiary?",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1665,"HFS",5665,"TKpd","DI009","Dioritic rocks","Monzodioritic rocks of Pike Creek-Largely medium-grained quartz monzodioritic and dioritic rocks in the southeast D-1 quadrangle.  SiO2 content ranges between 57.4 and 61.4 percent; as with other rocks in this region, alkalis tend to be higher that norma","Tertiary or Cretaceous",null,"Ar-Ar age of 64.42 +/- 0.04 Ma on biotite and on hornblende of 61.1 +/- 0.7 Ma which is essentially the same as the surrounding granodiorite.  As the surrounding granodiorite shows no evidence of contact metamorphism, this hornblende age should be consid","Dillingham","Igneous",null,"TKqd"]
[1665,null,5666,"TKqd","DI009","Monzontic rocks","Coarse- to fine-grained monzogranitic to monzodioritic rocks in the southeast D-1 quadrangle.  Rocks are typically dark green, have sparse clinopyroxene, and locally show evidence of contact metamorphism.  Amphibole dominant mafic, tends to be green pleo","Tertiary or Cretaceous",null,"An Ar-Ar age of 61.3 +/- 0.2 Ma on hornblende is coeval with some parts of the Pike Creek pluton; however, as for the hornblende date on the dioritic rocks of Pike Creek (unit TKpd above), this age may represent a minimum age","Dillingham","Igneous",null,"TKqd"]
[1665,null,141,"TKi1","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 1 Diorite","Altered pyroxene gabbro and hornblende-pyroxene diorite.  Assigned Tertiary or Cretaceous age, however, Jurassic age can not be ruled out.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKqd"]
[1665,null,143,"TKi3","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 3 Quartz diorite","Predominantly fine- to medium-grained altered hornblende-biotite quartz diorite and less commonly granodiorite.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKqd"]
[1665,null,146,"TKi6","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 6 Diorite","Numerous small diorite intrusions in central part of quadrangle.","Tertiary and (or) Cretaceous",null,"K-Ar age of 69.4 Ma","Lake Clark","Igneous",null,"TKqd"]
[1665,null,148,"TKi8","LC002","Tertiary and (or) Cretaceous intrusive rocks -- Unit 8 Monzodiorite","Medium-grained, hypidiomorphic-seriate textured monzodiorite., contains subequal hornblende and clinopyroxene.","Tertiary and (or) Cretaceous",null,null,"Lake Clark","Igneous",null,"TKgd"]
[1665,null,1207,"TKqm","LC012","Diorite","Diorite","Tertiary (Paleocene) or Late Cretaceous",null,null,"Lake Clark","Igneous",null,null]
[1665,null,1907,"TKd","TA019","Diorite","Diorite reported northeast of Cinnabar Creek","Tertiary or Cretaceous",null,null,"Taylor Mountains","Igneous",null,"TKg"]
[1955,null,180,"Kk","IL002","Kaguyak Formation","Silty, thin-bedded to massive, fine- to medium-grained, green to gray arkosic wacke sandstone and interbedded siltstone.","Late Cretaceous (Campanian, Maestrichtian)","Ammonits and pelecypods, mainly Diplomoceras notabile Whiteves, Pachydiscus (Neodesmocers) sp., and Inoceramus",null,"Iliamna","Sedimentary",null,"Kkg"]
[1961,null,72,"Kk","SV002","Kaguyak Formation, nonmarine sedimentary rocks","Sandstone, conglomerate, siltstone and interbedded coal","Late Cretaceous","Sporomorphs:  Cranwellia striata Srivastava, Balmeisporites spp., Wodehouseia spinata Staley, Proteacidites spp., Aquilapollenites bertillonites Funjhouser, A. reticulatus Mtchediishvilli, A delicatus Stanley",null,"Seldovia","Sedimentary",null,"Khc"]
[1970,"Q",5971,"Kk","DI005","Kuskokwim Group?","Photogeologic interpretation based on adjoining Taylor Mountains mapping.  Unit consists of dark siltstone and sandstone.","Cretaceous",null,null,"Dillingham","Sedimentary",null,"Kk"]
[1970,null,5970,"Kk","DI009","Kuskokwim Group","Well-bedded, rhythmically interbedded dark siltstone and sandstone.  Found only north of the Koktuli River","Cretaceous",null,null,"Dillingham","Sedimentary",null,"Kk"]
[1970,null,191,"KJs","LC002","Sedimentary rocks","Interbedded medium-gray, medium- to fine-grained lithic graywacke, silty sandstone, black shale, and local conglomerate.  Regional strike is a consistent N50E and parallel to fold axes.  Rocks range from unmetamorphosed but highly indurated to local well","Cretaceous? and Jurassic","Only fossil is Buchia mosquensis(?) of Late Jurassic age.",null,"Lake Clark","Sedimentary",null,"KJf"]
[1970,null,1970,"Kk","LC005","Kuskokwim Formation, undivided","Sandstone and siltstone","Cretaceous",null,null,"Lake Clark","Sedimentary",null,"Kk"]
[1970,null,5316,"KJsh","LC005","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- siltstone, argillite, and shale","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- siltstone, argillite, and shale containing important but subordinate beds of volcaniclastic sandstone.  Inferred on basis of Eakins and others (1978).","Cretaceous or Late Jurassic?",null,null,"Lake Clark","Sedimentary",null,null]
[1970,null,612,"Kk","LC006","Kuskokwim Formation, undivided","Sandstone and siltstone","Cretaceous",null,null,"Lake Clark","Sedimentary",null,"Kk"]
[1970,null,1209,"KJsh","LC012","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- siltstone, argillite, and shale","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- siltstone, argillite, and shale containing important but subordinate beds of volcaniclastic sandstone.","Late Jurassic?","Possible belemnoid at one locality",null,"Lake Clark","Sedimentary",null,null]
[1970,"HFS",1210,"KJh","LC012","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- hornfels","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- dark gray, locally gossanized, massive, hornfelsed KJs and KJsh, contains some spotted phyllite and numerous unmappable dikes.","Late Jurassic?","Possible belemnoid at one locality",null,"Lake Clark","Sedimentary",null,null]
[1970,"Q",180,"Kk","TA002","Kuskokwim Group?","Sandstone, siltstone, shale, and conglomerate","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,null,3180,"Kk","TA003","Kuskokwim Group sedimentary rocks","Sandstone, siltstone, shale, and conglomerate (Added, not in source)","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,null,4180,"Kk","TA004","Kuskokwim Group?","Sandstone, siltstone, shale, and conglomerate","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,null,121,"Kk","TA006","Kuskokwim Group","Marine sedimentary sequence consisting of graywacke, sandstone, conglomerate, siltstone, and shale.","Cretaceous","Early Cretaceous (Albian) age assigned from fossils found north of the map area.",null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,"HFS",903,"h","TA009","Hornfels","Contact metamorphic zones adjacent to igneous intrusive rocks.","Cretaceous",null,null,"Taylor Mountains","Metamorphic",null,"Kk"]
[1970,"Q",904,"s","TA009","Sedimentary rocks","Interbedded graywacke and shale, with local interbeds of argillite and conglomerate.","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,"HFS",1003,"h","TA010","Hornfels","Contact metamorphic zones adjacent to igneous intrusive rocks.","Cretaceous",null,null,"Taylor Mountains","Metamorphic",null,"Kk"]
[1970,null,1004,"s","TA010","Sedimentary rocks","Interbedded graywacke and shale, with local interbeds of argillite and conglomerate.","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,"HFS",1103,"h","TA011","Hornfels","Contact metamorphic zones adjacent to igneous intrusive rocks.","Cretaceous",null,null,"Taylor Mountains","Metamorphic",null,"Kk"]
[1970,null,1104,"s","TA011","Sedimentary rocks","Interbedded graywacke and shale, with local interbeds of argillite and conglomerate.","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,null,5180,"Kk","TA015","Kuskokwim Group?","Inferred to be Kuskokwim Group consisting of sandstone, siltstone, shale, and conglomerate","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kk"]
[1970,null,1906,"Kk","TA019","Kuskokwim Group","Fine- to medium-grained often micaceous gray greywacke or silty greywacke.  Occasionally crossbedded, or with siltstone partings.  Rare argillite pebbles","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,null]
[1985,null,181,"Kka","TA002","Kuskokwim Group, nearshore facies","Sandstone, siltstone, shale, and conglomerate","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kkn"]
[1985,null,1985,"Kka","TA008","Kuskokwim Group, nearshore facies","Sandstone, siltstone, shale, and conglomerate","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kkn"]
[1985,null,5181,"Kka","TA015","Kuskokwim Group, nearshore facies","Sandstone, siltstone, shale, and conglomerate.   Inferred from Platt and Muller (TA002) and Hoare and Condon (TA019)","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kkn"]
[1985,null,19181,"Kka","TA019","Kuskokwim Group, nearshore facies","Sandstone, siltstone, shale, and conglomerate","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"Kkn"]
[2190,null,2190,"KJm","KN003","McHugh Complex","Weakly metamorphosed siltstone, graywacke, arkose, and conglomeratic sandstone; greenstone (mostly basaltic), metachert, and argillite","Cretaceous and (or) Jurassic",null,null,"Kenai","Sedimentary",null,"Kmx"]
[2190,null,74,"KPmc","SV002","McHugh Complex, basalt and chert","Pillow and massive basalt, depositionally overlain by radiolarian chert.","Early Cretaceous (Albian) to Middle Triassic (Ladinian)","Cretaceous to Triassic radiolaria in bedded chert",null,"Seldovia","Sedimentary",null,"Kmx"]
[2190,null,75,"KPms","SV002","McHugh Complex, graywacke and conglomerate","Fault-bounded slices of massive conglomerate and graywacke.","Early Cretaceous to Early Jurassic (Pliensbachian)","Pliensbachian radiolaria in underlying ribbon chert",null,"Seldovia","Sedimentary",null,"Kmx"]
[2190,null,77,"KPm","SV002","McHugh Complex, undivided","Complexly deformed tectonic assemblage of diverse lithologies (melange).  Lithologies include argillite, tuff, graywacke, basalt, chert, outcrop-scale melange, conglomerate, gabbro, and limestone.  Rocks typically show prehnite-pumpellyite facies metamor","Cretaceous to Permian","Permian conodonts and fusilinids.",null,"Seldovia","Tectonite",null,"Kmx"]
[2260,null,210,"Tv","TA003","Volcanogenic sedimentary rocks","Volcanogenic sedimentary rocks.","Tertiary",null,null,"Taylor Mountains","Igneous",null,"Tvep"]
[2260,"Q",1509,"Kkv","TA015","Tuff and related rocks","Tuff, some cherty argillite, minor limestone and locally, dikes extrapolation by inferrence from Hoare and Condon notes","Cretaceous?",null,null,"Taylor Mountains","Igneous",null,null]
[2260,null,1909,"Kkv","TA019","Tuff and related rocks","Tuff, some cherty argillite, minor limestone and locally, dikes","Cretaceous?",null,null,"Taylor Mountains","Igneous",null,null]
[2401,null,0,"Kd","SV002","Intermediate dike","Basalt-andesite dike intruding McHugh Complex.  Stored in coverage as arcs, arc-code = 50 and arc-para1 = 5","Early Cretaceous",null,"Ar-Ar hornblende plateau age of 115 Ma","Seldovia","Igneous",null,"Kd"]
[2410,null,902,"Ku","KN009","Plutonic rocks, undivided","Plutonic rocks, undivided","Late Cretaceous",null,null,"Kenai","Igneous",null,null]
[2410,null,606,"Kg","LC006","Granitic rocks","Granitic rocks","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kg"]
[2420,null,667,"Ki7","IL006","Cretaceous intrusive rocks -- Unit 7 Granodiorite","Medium-grained, medium-gray hypidiomorphic-granular granodiorite.  Hornblende domination mafic, shows varying degrees of alteration.  Biotite locally present.  Locally cataclasis/mylonization.","Cretaceous",null,null,"Iliamna","Igneous",null,"Kgd"]
[2420,null,670,"Ki10","IL006","Cretaceous intrusive rocks -- Unit 10 Granodiorite","Medium-grained seriate, whitish-gray granodiorite.","Cretaceous",null,null,"Iliamna","Igneous",null,"Kgd"]
[2420,null,1,"Kgd","IL009","Grandoirite?","Granitic rocks associated with the Pebble Copper deposit","Cretaceous",null,"Dates between 89 and 100 Ma","Iliamna","Igneous",null,null]
[2420,null,161,"Ki1","LC002","Cretaceous intrusive rocks -- Unit 1 Granodiorite","Light- to medium-gray, medium-grained, seriate, hypidiomorphic granular granodiorite.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2420,null,162,"Ki2","LC002","Cretaceous intrusive rocks -- Unit 2 Quartz monzodiorite","Medium- to coarse-grained, locally foliated composite pluton cheifly of hornblende-biotite quartz monzodiorite.  Possibly the same pluton as unit Ki3, LC002.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2420,null,163,"Ki3","LC002","Cretaceous intrusive rocks -- Unit 3 Quartz monzodiorite","Medium- to coarse-grained, medium-gray hornblende-biotite quartz monzodiorite.  Possibly same pluton as Ki2, LC002.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2420,null,167,"Ki7","LC002","Cretaceous intrusive rocks -- Unit 7 Granodiorite","Medium-grained, medium-gray hypidiomorphic-granular granodiorite.  Hornblende domination mafic, shows varying degrees of alteration.  Biotite locally present.  Locally cataclasis/mylonization.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2420,null,169,"Ki9","LC002","Cretaceous intrusive rocks -- Unit 9 Granodiorite","Ranges from silicic granodiorite to mafic tonalite and quartz diorite.  Medium-grained, seriate and many show weak to strong cataclasis (probably mylonitic from description).  Some have subvertical, northeast trending primary foliation.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgdc"]
[2420,null,170,"Ki10","LC002","Cretaceous intrusive rocks -- Unit 10 Granodiorite","Medium-grained seriate, whitish-gray granodiorite.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2420,null,171,"Ki11","LC002","Cretaceous intrusive rocks -- Unit 11 Granodiorite","Medium- to coarse-grained subporphyritic granodiorite.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2420,null,173,"Ki13","LC002","Cretaceous intrusive rocks -- Unit 13 Granodiorite","Primarily granodiorite but includes some granite.  Notably, is generally coarse-grained.  Low color index, biotite primary mafic, with traces of hornblende and muscovite in all examined thin-sections.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2420,null,6420,"Ki11","LC005","Cretaceous intrusive rocks -- Unit 11 Granodiorite","Medium- to coarse-grained subporphyritic granodiorite.  Polygons added based on air photo interpretation of scoured bedrock","Cretaceous",null,null,"Lake Clark","Igneous",2750,"Kgd"]
[2430,null,172,"Ki12","KN008","Cretaceous intrusive rocks -- Unit 12 Quartz diorite","Locally foliated, seriate hornblende-biotite quartz diorite.  Biotite-hornblende rationis quite variable although color index remains constant.  Deuteric epidote common.  Extension from adjacent Lake Clark quadrangle","Cretaceous",null,null,"Kenai","Igneous",null,"Kgd"]
[2430,null,164,"Ki4","LC002","Cretaceous intrusive rocks -- Unit 4 Quartz diorite","Composite igneous mass that includes hornblende-pyroxene gabbro and diorite, quartz diorite, tonalite, and minor granodiorite.  Quartz diorite is the most abundant rock type and is medium- to coarse-grained, locally foliated, seriate and has more hornble","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kqd"]
[2430,null,165,"Ki5","LC002","Cretaceous intrusive rocks -- Unit 5 Quartz diorite","Mafic igneous rocks, chiefly quartz diorite.  Medium- to locally coarse-grained and having a well developed primary subvertical foliation that trends northeat.  Most samples show cataclasis (mylonization?), which is pronouced near the shear zone in south","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgdc"]
[2430,null,166,"Ki6","LC002","Cretaceous intrusive rocks -- Unit 6 Quartz diorite","Slightly foliated, medium-grained, seriate, hornblende-biotite quartz diorite.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kqd"]
[2430,null,172,"Ki12","LC002","Cretaceous intrusive rocks -- Unit 12 Quartz diorite","Locally foliated, seriate hornblende-biotite quartz diorite.  Biotite-hornblende rationis quite variable although color index remains constant.  Deuteric epidote common.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kgd"]
[2460,null,668,"Ki8","IL006","Cretaceous intrusive rocks -- Unit 8 Granite","Coarse-grained, subporpyritic granite.  Part of a granite body exposed to the south in Iliamna quadrangle.","Cretaceous",null,null,"Iliamna","Igneous",null,"Kg"]
[2460,null,168,"Ki8","LC002","Cretaceous intrusive rocks -- Unit 8 Granite","Coarse-grained, subporpyritic granite.  Part of a granite body exposed to the south in Iliamna quadrangle.","Cretaceous",null,null,"Lake Clark","Igneous",null,"Kg"]
[2470,null,5470,"Kgk","DI005","Potassic granitic rocks of the Okstukuk Hills","Okstukuk Hills, biotite granite or syenite having very coarse feldspar laths, medium-grained very fresh biotite and fine-grained clinopyroxene","Late Cretaceous",null,"Ar-Ar total fusion age 84.49 +/- 0.05 biotite","Dillingham","Igneous",null,null]
[2470,null,160,"Kqm","IL002","Quartz monzonite","Massive, coarse-grained light-gray porphyritic quartz monzonite.","Late Cretaceous",null,"K-Ar age on co-existing biotite and hornblende yielded 80.7 and 83.4 Ma and hornblende yielded 74.1 Ma","Iliamna","Igneous",null,"Kg"]
[2470,null,175,"Ki15","LC002","Cretaceous intrusive rocks -- Unit 15 Quartz monzonite","Fine- to medium-grained hypidiomorphic seriate quartz monzonite.","Cretaceous",null,"K-Ar age on hornblende is \"Late Cretaceous\"","Lake Clark","Igneous",null,"Kg"]
[2480,null,174,"Ki14","LC002","Cretaceous intrusive rocks -- Unit 14 Granodiorite","Porphyritic granodiorite having phenocrysts of quartz, plagioclase, biotite, and glomeroporphyritic clusters of pale-green amphibole in a groundmass of quartz and mostly potassic feldspar.","Cretaceous",null,"K-Ar age on biotite is \"Late Cretaceous\"","Lake Clark","Igneous",null,"Kgd"]
[2480,null,5480,"Kg","TA015","Granodiorite","Called granodiorite tentatively based on mode.  Chemistry suggests diorite probably -- most similar to diorite field of LeMaitre (1976).  More probably proper name might be quartz diorite.","Cretaceous",null,"40/39 age of 75.22 Ma","Taylor Mountains","Igneous",null,null]
[2700,null,2700,"KJv","KN003","Valdez Group (?)","Metawacke, metasiltstone, and argillite; locally phyllitic","Cretaceous and Jurassic (?)",null,null,"Kenai","Metamorphic",null,"Kvs"]
[2700,null,71,"Kv","SV002","Valdez Group","Thick sequences of drab, rythmically alternating multiply deformed turbidites, including metasandstone, metasiltstone, argillite, slate, and phyllite, and rare beds of pebbly argillite and metasandstone;  generally beds are a few centimeters to a few met","Late Cretaceous","Maestrichtian and Campanian(?) Inoceramus",null,"Seldovia","Metamorphic",null,"Kvs"]
[2700,null,1071,"Kvm","SV002","Melange of Iceworm Peak","Tectonic melange consisting of blocks of graywacke in a phacoidally cleaved matrix of slate having a Valdez Group protolith.","Late Cretaceous",null,null,"Seldovia","Metamorphic",null,"Kvs"]
[2830,null,300,"KCg1","DI002","Gemuk Group -- clastic rocks","Primarily coarse-grained clastic rocks containing some fine-grained cherty and volcanic material.","Probably Cretaceous to Triassic","Early Cretaceous (Valanginian), Jurassic, and Triassic",null,"Dillingham","Sedimentary",null,"KJsv"]
[2830,null,7300,"KJvs","DI007","Togiak-Tikchik Complex mixed clastic rocks","Primarily coarse-grained clastic rocks containing some fine-grained cherty and volcanic material.  Highly contorted bedding common","Probably Cretaceous to Triassic","Early Cretaceous (Valanginian), Jurassic, and Triassic",null,"Dillingham","Sedimentary",null,null]
[2830,null,183,"KCg1","TA002","Gemuk Group -- clastic rocks","Primarily coarse-grained clastic rocks containing some fine-grained cherty and volcanic material.","Probably Cretaceous to Triassic","Early Cretaceous (Valanginian), Jurassic, and Triassic",null,"Taylor Mountains","Sedimentary",null,"KJsv"]
[2830,null,183,"KJs","TA003","Argillite and graywacke","Argillite and graywacke","Cretaceous to Jurassic",null,null,"Taylor Mountains","Sedimentary",null,"KJs"]
[2830,null,183,"KJs","TA004","Argillite and graywacke","Argillite and graywacke","Cretaceous to Jurassic",null,null,"Taylor Mountains","Sedimentary",null,"KJs"]
[2830,null,1510,"s","TA015","Sedimentary rocks","Interbedded graywacke and shale, with local interbeds of argillite and conglomerate.  In this quadrangle (D-8), most certainly includes rocks of the Gemuk Group and to a lesser extent Kuskokwim Group.  Includes, based on Hoare and Condon notes of 1969 an","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,null]
[2830,null,1910,"Mzgg","TA019","Greywacke, greenstone, chert, and limestone","Calcareous argillic greywacke, greenstone, chert, cherty argillite, limestone, and greenschist","Mesozoic?",null,null,"Taylor Mountains","Metamorphic",null,null]
[2831,null,1531,"KJsvi","TA015","Greywacke, greenstone, chert, and limestone","Calcareous argillic greywacke, greenstone, chert, cherty argillite, limestone, and greenschist apparently cut by dike swarms or shallow intrusions.  Unit inferred from air-photos","Mesozoic?",null,null,"Taylor Mountains","Metamorphic",null,null]
[2855,null,9312,"Jk","DI009","Graywacke and conglomerate","Typically dark-green or gray massive sandstone, although coarse-pebble conglomerate is locally present.  Rare fragmentary fossils are found within map area; a sample we collected in 2001 yielded fragments of Buchia, suggesting a Late Jurassic or Early Cr","Middle to Late Jurassic?","Rare fragmentary fossils, appearing to be possibly Buchia.  Reported Jurassic fossils found by Unocal in 1959.",null,"Dillingham","Sedimentary",null,"Jkw"]
[2855,null,181,"KJs","IL002","Sedimentary rocks, undivided","Dark-gray to green lithic metagraywacke, polymicitc conglomerate, and argillite are main rock types.  All are low-grade metamorphic, ranging from prehnite-pumpellyite to greenschist facies.  Argillite and siltstone facies show evidence of turbidite depos","Jurassic or Cretaceous","Nearly identical suite in the Nushagak Bay quadrangle yielded Middle Jurassic fossils, however a Cretaceous age can not be ruled out for the rocks in the Iliamna quadrangle (Graywacke of Kulukak Bay, NSA = 3140).",null,"Iliamna","Metamorphic",null,"Jkw"]
[2855,null,190,"KJs","LC002","Sedimentary rocks","Interbedded medium-gray, medium- to fine-grained lithic graywacke, silty sandstone, black shale, and local conglomerate.  Regional strike is a consistent N50E and parallel to fold axes.  Rocks range from unmetamorphosed but highly indurated to local well","Cretaceous? and Jurassic","Only fossil is Buchia mosquensis(?) of Late Jurassic age.",null,"Lake Clark","Sedimentary",null,"KJf"]
[2855,null,300,"KJkr","LC003","Koksetna River sequence","Complexly deformed volcanic-lithic turbidites.  Consists of thick monotonous sequence of thin sandstone interbedded with pelagic shale.  Coarse, unsorted and chaotic matrix-supported conglomerate occurs sporadically","Early Cretaceous (Valanginian) to Late Jurassic (Kimmeridgian)","Two fossils reported, late Jurassic (Kimmeridgian) and Early Cretaceous (Valanginian)",null,"Lake Clark","Sedimentary",null,"KJkr"]
[2855,null,5181,"Jkw","LC005","Sedimentary rocks, undivided","Small area shown as KJs by Wallace and the extension of map unit KJs from the Iliamna map to the south.  Assigned to unit KJkr.  Also includes a single polygon in southwest part of quadrangle that is extension of unit KJs of the Iliamna quadrangle.  Pres","Jurassic or Cretaceous","Nearly identical suite in the Nushagak Bay quadrangle yielded Middle Jurassic fossils, however a Cretaceous age can not be ruled out for the rocks in the Iliamna quadrangle (Graywacke of Kulukak Bay, NSA = 3140).",null,"Lake Clark","Metamorphic",null,null]
[2855,null,5315,"KJs","LC005","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- sandstone","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- volcaniclastic sandstone containing important but subordinate beds of siltstone and shale and minor beds of granule conglomerate.  Inferred on basis of Eakins and others (1978).","Late Jurassic?",null,null,"Lake Clark","Sedimentary",null,null]
[2855,null,608,"KJkr","LC006","Koksetna River sequence","Jura-Cretaceous flysch, southern part of Kahiltna terrane","Cretaceous and Jurassic",null,null,"Lake Clark","Sedimentary",null,"KJkr"]
[2855,"Q",609,"KJkr?","LC006","Koksetna River sequence?","Jura-Cretaceous flysch, southern part of Kahiltna terrane","Cretaceous and Jurassic",null,null,"Lake Clark","Sedimentary",null,"KJkr"]
[2855,null,610,"KJs","LC006","Flysch sequence, undivided","Jura-Cretaceous flysch, southern part of Kahiltna terrane","Cretaceous and Jurassic",null,null,"Lake Clark","Sedimentary",null,"KJf"]
[2855,"HFS",611,"KJs","LC006","Flysch sequence, undivided, hornfels","Jura-Cretaceous flysch, southern part of Kahiltna terrane","Cretaceous and Jurassic",null,null,"Lake Clark","Sedimentary",null,"KJf"]
[2855,null,1208,"KJs","LC012","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- sandstone","Interbedded marine volcaniclastic sandstone, siltstone, and shale -- volcaniclastic sandstone containing important but subordinate beds of siltstone and shale and minor beds of granule conglomerate.","Late Jurassic?","Probable Buchia mosquensis at one locality",null,"Lake Clark","Sedimentary",null,null]
[2855,null,5150,"KJs","TA015","Sedimentary rocks","Presence inferred on the basis of similar rocks in Dillingham quadrangle to the south and the Lake Clark quadrangle to east.  Fossil collections by UNOCAL geologists in 1959, originally reported as being in the Dillingham quadrangle were most likely from","Cretaceous? and Jurassic","Only fossil is Buchia mosquensis(?) of Late Jurassic age.",null,"Taylor Mountains","Sedimentary",null,"KJf"]
[2870,"HFS",5230,"KJv","DI009","Olivine basalt","Olivine basalt flows and fragmental mafic volcanic rocks-Ranges in apparent composition from andesite to basalt based on field calls.  Part of unit KJvs volcanic and sedimentary rocks; mapped separately only locally.","Cretaceous?",null,null,"Dillingham","Igneous",null,"KJv"]
[2872,null,127,"KJvs","DI003","Volcanic and sedimentary rocks","Thick marine unit consisting of volcanic and sedimentary rocks.  Volcanic rocks range in composition from mafic pillow basalts to more abundant andesitic and trachytic flows, tuff, and breccia.  Interbedded with the volcanic rocks are tuffaceous siltston","Early Cretaceous to Middle Jurassic","Radiolaria of Late Jurassic to Early Cretaceous age, and fragmentary ammonites of Jurassic age.",null,"Dillingham","Sedimentary",null,"KJvs"]
[2872,null,5872,"KJvs","DI005","Volcanic and sedimentary rocks","Thick marine unit consisting of volcanic and sedimentary rocks.  Volcanics range in composition from mafic pillow basalts to more abundant andesitic and trachytic flows, tuffs, and breccias.  Interbedded with the volcanic rocks are tuffaceous siltstone,","Early Cretaceous to Middle Jurassic","Radiolaria of Late Jurassic to Early Cretaceous age, and fragmentary ammonites of Jurassic age.",null,"Dillingham","Sedimentary",null,"KJvs"]
[2872,null,9872,"KJvs","DI009","Volcanic and sedimentary rocks","Low-grade metamorphic or contact metamorphosed volcanic and lesser sedimentary rocks.  Altered volcanic breccia is relatively abundant; however in the southwestern part of T.4 S., R.40 W., unit consists largely of vertically standing beds of contact-meta","Early Cretaceous to Middle Jurassic","Radiolaria of Late Jurassic to Early Cretaceous age and fragmentary ammonites of Jurassic age have been collected from this unit in the Goodnews Bay quadrangle to the west (Hoare and Coonrad, 1978)",null,"Dillingham","Sedimentary",null,"KJvs"]
[2900,null,1350,"Tgd","KN002","Granodioritic rocks","Granodiorite and quartz diorite","Tertiary",null,"Age assigned revised based on Nelson and others (1983)","Kenai","Igneous",null,"Thgd"]
[2900,null,180,"KJi","LC002","Cretaceous(?) and Jurassic(?) intrusive rocks -- Quartz monzodiorite","Medium-gray, medium-grained, hypidiomorphic granular hornblende-biotite quartz monzodiorite containing variable amounts of clinopyroxene.  Flow structures locally present and hornblende and plagioclase is aligned in a north-northeast direction.","Cretaceous? and Jurassic?",null,"K-Ar biotite and hornblende ages ranging from 57.4 to 95.1 Ma","Lake Clark","Igneous",null,"KJg"]
[3000,null,810,"Js","IL008","Sedimentary rocks","Sedimentary rocks, undifferentiated","Jurassic",null,null,"Iliamna","Sedimentary",null,null]
[3000,null,11300,"Js","KN011","Sedimentary rocks","Sedimentary rocks, undifferentiated","Jurassic",null,null,"Kenai","Sedimentary",null,null]
[3000,null,601,"J","LC006","Jurassic sedimentary rocks","Jurassic sedimentary rocks","Jurassic",null,null,"Lake Clark","Sedimentary",null,"Jsu"]
[3000,null,5300,"Js","SV005","Sedimentary rocks","Sedimentary rocks, undifferentiated","Jurassic",null,null,"Seldovia","Sedimentary",null,null]
[3010,null,120,"Jn","IL002","Naknek Formation","Arkose, conglomerate, sandstone, siltstone, and shale","Late Jurassic  (Oxfordian to Tithonian)","Ammonites and pelecypods, especially Buchia which provides tight age control",null,"Iliamna","Sedimentary",null,"Jn"]
[3010,null,3010,"Jn","KN002","Naknek Formation","Sandstone, arkose, conglomerate, and siltstone","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Jn"]
[3010,null,47,"Jn","SV002","Naknek Formation","Arkose, conglomerate, sandstone, siltstone, and shale","Late Jurassic (Oxfordian to Kimmeridgian)","Ammonites and pelecypods, especially Buchia which provides tight age control",null,"Seldovia","Sedimentary",null,"Jn"]
[3012,null,516,"Jnss","IL007","Naknek Formation, lower sandstone member","Thin-bedded to massive arkosic sandstone, graywacke, and siltstone, mainly restricted to central part of region","Late Jurassic",null,null,"Iliamna","Sedimentary",null,"Jnn"]
[3012,null,516,"Jnss","KN005","Naknek Formation, lower sandstone member","Thin-bedded to massive arkosic sandstone, graywacke, and siltstone, mainly restricted to central part of region","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Jnn"]
[3012,null,516,"Jnss","SV004","Naknek Formation, lower sandstone member","Thin-bedded to massive arkosic sandstone, graywacke, and siltstone, mainly restricted to central part of region","Late Jurassic",null,null,"Seldovia","Sedimentary",null,"Jnn"]
[3013,null,515,"Jns","IL007","Naknek Formation, Snug Harbor Siltstone Member","Massive to thin-bedded dark-gray to black siltstone; laminated near base","Late Jurassic",null,null,"Iliamna","Sedimentary",null,"Jns"]
[3013,null,515,"Jns","KN005","Naknek Formation, Snug Harbor Siltstone Member","Massive to thin-bedded dark-gray to black siltstone; laminated near base","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Jns"]
[3013,null,515,"Jns","SV004","Naknek Formation, Snug Harbor Siltstone Member","Massive to thin-bedded dark-gray to black siltstone; laminated near base","Late Jurassic",null,null,"Seldovia","Sedimentary",null,"Jns"]
[3014,null,514,"Jnp","IL007","Naknek Formation, Pomeroy Arkose Member","Massive light-gray arkose and arkosic conglomerate; minor interbeds of siltstone","Late Jurassic",null,null,"Iliamna","Sedimentary",null,"Jni"]
[3014,null,514,"Jnp","KN005","Naknek Formation, Pomeroy Arkose Member","Massive light-gray arkose and arkosic conglomerate; minor interbeds of siltstone","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Jni"]
[3014,null,514,"Jnp","SV004","Naknek Formation, Pomeroy Arkose Member","Massive light-gray arkose and arkosic conglomerate; minor interbeds of siltstone","Late Jurassic",null,null,"Seldovia","Sedimentary",null,"Jni"]
[3016,null,517,"Jnc","IL007","Naknek Formation, Chisik Conglomerate Member","Massive cobble-boulder conglomerate, mainly restricted to area adjacent to Iniskin Bay and Tuxedni Bay","Late Jurassic",null,null,"Iliamna","Sedimentary",null,"Jnc"]
[3016,null,517,"Jnc","KN005","Naknek Formation, Chisik Conglomerate Member","Massive cobble-boulder conglomerate, mainly restricted to area adjacent to Iniskin Bay and Tuxedni Bay","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Jnc"]
[3020,null,518,"Jcp","IL007","Chinitna Formation, Paveloff Siltstone Member","Massive to thin-bedded gray arenaceous siltstone, weathers gray, large ellipsoidal concretions and lenticular beds of limestone, massive sandstone unit at base","Late Jurassic",null,null,"Iliamna","Sedimentary",null,"Js"]
[3020,null,518,"Jcp","KN005","Chinitna Formation, Paveloff Siltstone Member","Massive to thin-bedded gray arenaceous siltstone, weathers gray, large ellipsoidal concretions and lenticular beds of limestone, massive sandstone unit at base","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Js"]
[3020,null,518,"Jcp","SV004","Chinitna Formation, Paveloff Siltstone Member","Massive to thin-bedded gray arenaceous siltstone, weathers gray, large ellipsoidal concretions and lenticular beds of limestone, massive sandstone unit at base","Late Jurassic",null,null,"Seldovia","Sedimentary",null,"Js"]
[3025,null,121,"Jc","IL002","Chinitna Formation","Primarily dark-gray to brown massive arenacous siltstone containing a few sandstone interbeds and numerous limestone concretions.  Unit is subdivided into members, however not on this map","Middle Jurassic (Callovian)","Abundant fossils, including many species of ammonites:  Cadoceras, C. stenocadoceras, C. pseudocadoceras, Kepplerites, Kheraiceras, Lilloettia, and Gowericeras.  Also especially known for Iniskinites and Chinitnites",null,"Iliamna","Sedimentary",null,"Jc"]
[3025,null,3030,"Jc","KN002","Chinitna Formation","Siltstone, limestone concretions, and sandstone","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Jc"]
[3025,null,32,"Jc","SV002","Chinitna Formation","Primarily dark-gray to brown massive arenacous siltstone containing a few sandstone interbeds and numerous limestone concretions.  Unit is subdivided into members, however not on this map","Late Jurassic (Callovian)","Abundant fossils, including many species of ammonites:  Cadoceras, C. stenocadoceras, C. pseudocadoceras, Kepplerites, Kheraiceras, Lilloettia, and Gowericeras.  Also especially known for Iniskinites and Chinitnites",null,"Seldovia","Sedimentary",null,"Jc"]
[3030,null,519,"Jct","IL007","Chinitna Formation, Tonnie Siltstone Member","Massive to thin-bedded brownish-gray arenaceous siltstone, weathers red-brown, small yellowish-brown limestone concretions in parallel bands, minor sandstone at base","Late Jurassic",null,null,"Iliamna","Sedimentary",null,"Jc"]
[3030,null,519,"Jct","KN005","Chinitna Formation, Tonnie Siltstone Member","Massive to thin-bedded brownish-gray arenaceous siltstone, weathers red-brown, small yellowish-brown limestone concretions in parallel bands, minor sandstone at base","Late Jurassic",null,null,"Kenai","Sedimentary",null,"Jc"]
[3030,null,519,"Jct","SV004","Chinitna Formation, Tonnie Siltstone Member","Massive to thin-bedded brownish-gray arenaceous siltstone, weathers red-brown, small yellowish-brown limestone concretions in parallel bands, minor sandstone at base","Late Jurassic",null,null,"Seldovia","Sedimentary",null,"Jc"]
[3150,null,130,"Jk","DI003","Graywacke of Kulukak Bay","A thick marine sedimentary unit referred to as \"Weary graywacke\" by Hoare and others, 1975.  Consists of very hard graywacke and siltstone with local conglomerate.","Middle to early Late Jurassic","Buchia, Inoceramus, belemnites, and rare ammonite fragments ranging from Middle to early Late Jurassic age.",null,"Dillingham","Sedimentary",null,"Jkw"]
[3150,null,5312,"Jk","DI005","Graywacke of Kulukak Bay","A thick marine sedimentary unit referred to as \"Weary graywacke\" by Hoare and others, 1975.  Mapped in the eastern part of the quadrangle by correlation with unit KJs of the adjacent Iliamna quadrangle.  Typically consists of dark green or gray massive s","Middle to early Late Jurassic","Rare fragmentary fossils, appearing to be possibly Buchia.  Reported Jurassic fossils found by Unocal in 1959.",null,"Dillingham","Sedimentary",null,"Jkw"]
[3180,null,122,"Jt","IL002","Tuxedni Group","Light- to dark-gray and green graywacke, conglomerate, siltstone, and shale.  Graywacke ranges from feldspathic to lithic to laumontitic; conglomerate composed mainly of volcanic clasts in a graywacke matrix.  Unit is subdivided into Formation, however n","Middle Jurassic (Bajocian and Bathonian)","Abundantly fossiliferous, containing ammonites and pelecypods.  Key ammonites include Erycites, Tmetoceras, Sonninia, Stemmatoceras, Emileia, Stephanoceras, Chondroceras, and many others",null,"Iliamna","Sedimentary",null,"Jtx"]
[3180,null,3180,"Jt","KN002","Tuxedni Formation","Sandstone, siltstone, and limy concretions","Middle Jurassic",null,null,"Kenai","Sedimentary",null,"Jtx"]
[3180,null,50,"Jtu","SV002","Tuxedni Formation","Light- to dark-gray and green graywacke, conglomerate, siltstone, and shale.  Graywacke ranges from feldspathic to lithic to laumontitic; conglomerate composed mainly of volcanic clasts in a graywacke matrix.  Unit is subdivided into Formation, however n","Middle to Late Jurassic (Bajocian to Callovian)","Abundantly fossiliferous, containing ammonites and pelecypods.  Key ammonites include Erycites, Tmetoceras, Sonninia, Stemmatoceras, Emileia, Stephanoceras, Chondroceras, and many others",null,"Seldovia","Sedimentary",null,"Jtx"]
[3181,null,520,"Jtb","IL007","Tuxedni Group, Bowser Formation","Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes.  Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Peninsula.  The sandstone and the con","Middle and Late Jurassic","Abundantly fossiliferous, containing ammonites and pelecypods, the units can be divided into two faunal zones which correspond to the break between the Middle and Upper Jurassic.  The lower faunal zone immediately overlies the unconformity with the Twist",null,"Iliamna","Sedimentary",null,"Jtx"]
[3181,null,520,"Jtb","KN005","Tuxedni Group, Bowser Formation","Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes.  Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Peninsula.  The sandstone and the con","Middle and Late Jurassic","Abundantly fossiliferous, containing ammonites and pelecypods, the units can be divided into two faunal zones which correspond to the break between the Middle and Upper Jurassic.  The lower faunal zone immediately overlies the unconformity with the Twist",null,"Kenai","Sedimentary",null,"Jtx"]
[3181,null,520,"Jtb","SV004","Tuxedni Group, Bowser Formation","Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes.  Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Peninsula.  The sandstone and the con","Middle and Late Jurassic","Abundantly fossiliferous, containing ammonites and pelecypods, the units can be divided into two faunal zones which correspond to the break between the Middle and Upper Jurassic.  The lower faunal zone immediately overlies the unconformity with the Twist",null,"Seldovia","Sedimentary",null,"Jtx"]
[3182,null,521,"Jtt","IL007","Tuxedni Group, Twist Creek Siltstone","Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125-m-thick.  The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright orange color.  Small limestone","Middle Jurassic","Abundant ammonite fauna which includes Oppelia (Liroxyites), Megasphaerceras, Leptoshinctes, Lissoceras, and Normannites (Dettermanites)",null,"Iliamna","Sedimentary",null,"Jtx"]
[3182,null,521,"Jtt","KN005","Tuxedni Group, Twist Creek Siltstone","Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125-m-thick.  The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright orange color.  Small limestone","Middle Jurassic","Abundant ammonite fauna which includes Oppelia (Liroxyites), Megasphaerceras, Leptoshinctes, Lissoceras, and Normannites (Dettermanites)",null,"Kenai","Sedimentary",null,"Jtx"]
[3182,null,521,"Jtt","SV004","Tuxedni Group, Twist Creek Siltstone","Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125-m-thick.  The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright orange color.  Small limestone","Middle Jurassic","Abundant ammonite fauna which includes Oppelia (Liroxyites), Megasphaerceras, Leptoshinctes, Lissoceras, and Normannites (Dettermanites)",null,"Seldovia","Sedimentary",null,"Jtx"]
[3183,null,522,"Jtc","IL007","Tuxedni Group, Cynthia Falls Sandstone","Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200-m-thick.  The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded bedding.  The sandstone consists","Middle Jurassic","The sparse fauna includes the ammonites Chondroceras and Stephanoceras as well as the pelecypods Inoceramus sp. and Mytilus sp.",null,"Iliamna","Sedimentary",null,"Jtx"]
[3183,null,522,"Jtc","KN005","Tuxedni Group, Cynthia Falls Sandstone","Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200-m-thick.  The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded bedding.  The sandstone consists","Middle Jurassic","The sparse fauna includes the ammonites Chondroceras and Stephanoceras as well as the pelecypods Inoceramus sp. and Mytilus sp.",null,"Kenai","Sedimentary",null,"Jtx"]
[3183,null,522,"Jtc","SV004","Tuxedni Group, Cynthia Falls Sandstone","Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200-m-thick.  The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded bedding.  The sandstone consists","Middle Jurassic","The sparse fauna includes the ammonites Chondroceras and Stephanoceras as well as the pelecypods Inoceramus sp. and Mytilus sp.",null,"Seldovia","Sedimentary",null,"Jtx"]
[3184,null,523,"Jtf","IL007","Tuxedni Group, Fitz Creek Siltstone","Thick sequence of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions.  Interbedded are fine-grained sandstone and, locally, conglomerate interbeds.  In","Middle Jurassic","This unit is abundantly fossiliferous and is the first unit of the Tuxedini Group where ammonites are more numerous than pelecypods.  A few non-diagnostic brachiopods are also present.  The ammonites include Normannites, Teloceras, and Chondroceras and m",null,"Iliamna","Sedimentary",null,"Jtx"]
[3184,null,523,"Jtf","KN005","Tuxedni Group, Fitz Creek Siltstone","Thick sequence of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions.  Interbedded are fine-grained sandstone and, locally, conglomerate interbeds.  In","Middle Jurassic","This unit is abundantly fossiliferous and is the first unit of the Tuxedini Group where ammonites are more numerous than pelecypods.  A few non-diagnostic brachiopods are also present.  The ammonites include Normannites, Teloceras, and Chondroceras and m",null,"Kenai","Sedimentary",null,"Jtx"]
[3184,null,523,"Jtf","SV004","Tuxedni Group, Fitz Creek Siltstone","Thick sequence of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions.  Interbedded are fine-grained sandstone and, locally, conglomerate interbeds.  In","Middle Jurassic","This unit is abundantly fossiliferous and is the first unit of the Tuxedini Group where ammonites are more numerous than pelecypods.  A few non-diagnostic brachiopods are also present.  The ammonites include Normannites, Teloceras, and Chondroceras and m",null,"Seldovia","Sedimentary",null,"Jtx"]
[3185,null,524,"Jtg","IL007","Tuxedni Group, Gaikema Sandstone","Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding.  Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of red and green felsic volcanic rocks, aphanitic igneous rocks","Middle Jurassic","Fossiliferous throughout, containing pelcypods Meleagrinella, Trigonia, and Inoceramus and ammonites Witchellia(?), Stephanceras and locally, Sonninia (Papilliceras), Lissoceras, and Emileia",null,"Iliamna","Sedimentary",null,"Jtx"]
[3185,null,524,"Jtg","KN005","Tuxedni Group, Gaikema Sandstone","Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding.  Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of red and green felsic volcanic rocks, aphanitic igneous rocks","Middle Jurassic","Fossiliferous throughout, containing pelcypods Meleagrinella, Trigonia, and Inoceramus and ammonites Witchellia(?), Stephanceras and locally, Sonninia (Papilliceras), Lissoceras, and Emileia",null,"Kenai","Sedimentary",null,"Jtx"]
[3185,null,524,"Jtg","SV004","Tuxedni Group, Gaikema Sandstone","Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding.  Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of red and green felsic volcanic rocks, aphanitic igneous rocks","Middle Jurassic","Fossiliferous throughout, containing pelcypods Meleagrinella, Trigonia, and Inoceramus and ammonites Witchellia(?), Stephanceras and locally, Sonninia (Papilliceras), Lissoceras, and Emileia",null,"Seldovia","Sedimentary",null,"Jtx"]
[3186,null,525,"Jtr","IL007","Tuxedni Group, Red Glacier Formation","Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone in the concentrated in the upper part of the unit and consisting of about 40 percent of the Formation.  The siltstone is highly arenaceous and locally contains lentic","Middle Jurassic","The Red Glacier Formation is most abundantly fossiliferous in its upper parts, no fossils are known from the lower 2000 feet of the unit.  Pelcypods include Meleagrinella, Trigonia, Inoceramus, Camptonectes, and Pleuromya.  Ammonites occur in two distinc",null,"Iliamna","Sedimentary",null,"Jtx"]
[3186,null,525,"Jtr","KN005","Tuxedni Group, Red Glacier Formation","Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone in the concentrated in the upper part of the unit and consisting of about 40 percent of the Formation.  The siltstone is highly arenaceous and locally contains lentic","Middle Jurassic","The Red Glacier Formation is most abundantly fossiliferous in its upper parts, no fossils are known from the lower 2000 feet of the unit.  Pelcypods include Meleagrinella, Trigonia, Inoceramus, Camptonectes, and Pleuromya.  Ammonites occur in two distinc",null,"Kenai","Sedimentary",null,"Jtx"]
[3186,null,525,"Jtr","SV004","Tuxedni Group, Red Glacier Formation","Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone in the concentrated in the upper part of the unit and consisting of about 40 percent of the Formation.  The siltstone is highly arenaceous and locally contains lentic","Middle Jurassic","The Red Glacier Formation is most abundantly fossiliferous in its upper parts, no fossils are known from the lower 2000 feet of the unit.  Pelcypods include Meleagrinella, Trigonia, Inoceramus, Camptonectes, and Pleuromya.  Ammonites occur in two distinc",null,"Seldovia","Sedimentary",null,"Jtx"]
[3220,null,132,"Jlvs","TA006","Volcanic and sedimentary rocks","Marine unit of mafic flows, some pillow structure, volcanic breccias, and massive fine- to medium-grained volcanogenic sedimentary rocks.  Fractures commonly coated with laumontite","Early Jurassic","Weyla pelecypods of Early Jurassic age.",null,"Taylor Mountains","Sedimentary",null,"JTrtk"]
[3220,null,1932,"Jlvs","TA019","Volcanic and sedimentary rocks","Marine unit of mafic flows, some pillow structure, volcanic breccias, and massive fine- to medium-grained volcanogenic sedimentary rocks.  Fractures commonly coated with laumontite","Early Jurassic","Weyla pelecypods of Early Jurassic age.",null,"Taylor Mountains","Sedimentary",null,"JTrtk"]
[3250,null,124,"Jtk","IL002","Talkeetna Formation","Mainly volcanic breccia, agglomerate, lava flows, and tuff.  Sedimentary rocks locally interbedded but are minor.  Informally divided into three members, which correlate with formal members elsewhere.","Early Jurassic -- Sinemurian to Pliensbachian","Nondiagnostic in Iliamna quadrangle, good fossils known from northern exposures in Talkeetna Mountains.",null,"Iliamna","Igneous",null,"JTrtk"]
[3250,null,529,"Jtku","IL007","Talkeetna Formation, undivided","Tuff, sandstone, agglomerate, breccia and some lava flows","Early Jurassic",null,null,"Iliamna","Igneous",null,"JTrtk"]
[3250,"HFS",2825,"KJu","KN002","Metasedimentary rocks (undivided)","Weakly metamorphosed slate and graywacke; locally includes volcanic and intrusive rocks, undivided.  Consists of contact metamorposed Talkeetna Formation according to Detterman and others (1976, KN010).","Cretaceous and (or) Jurassic",null,null,"Kenai","Metamorphic",null,"KJfm"]
[3250,null,3250,"Jtk","KN002","Talkeetna Formation","Volcanic breccia, tuff, agglomerate, and aphanitic lava flows; as mapped, locally includes Kamishak Formation in Ilianna Quad","Early Jurassic",null,null,"Kenai","Igneous",null,"JTrtk"]
[3250,null,529,"Jtku","KN005","Talkeetna Formation, undivided","Tuff, sandstone, agglomerate, breccia and some lava flows","Early Jurassic",null,null,"Kenai","Igneous",null,"JTrtk"]
[3250,null,622,"bpT","KN006","Jurassic bedrock","Volcanic flows, tuffs, and breccias, metamorphic equivalents, and granodiorite.  Talkeetna Formation and other units","Jurassic",null,null,"Kenai","Igneous",null,"JTrtk"]
[3250,null,904,"Jv","KN009","Volcanic rocks","Volcanic rocks, locally includes sedimentary rocks","Jurassic",null,null,"Kenai","Igneous",null,null]
[3250,"HFS",1010,"Mz","KN010","Metamorphic rocks","Schist, hornfels, and amphibolite, contact metamorphosed Talkeetna Formation","Mesozoic",null,null,"Kenai","Metamorphic",null,null]
[3250,null,1206,"sv","KN012","Sedimentary and volcanic rocks","Cheifly Jurassic volcanic rocks; locally includes Mesozoic and Cenozoic sedimentary and volcanic rocks","Cenozoic and Mesozoic",null,null,"Kenai","Sedimentary",null,null]
[3250,null,5124,"Jtk","LC005","Talkeetna Formation","Mainly volcanic breccia, agglomerate, lava flows, and tuff.  Sedimentary rocks locally interbedded but are minor.  Informally divided into three members, which correlate with formal members elsewhere.","Early Jurassic -- Sinemurian to Pliensbachian","Nondiagnostic in Iliamna quadrangle, good fossils known from northern exposures in Talkeetna Mountains.",null,"Lake Clark","Igneous",null,"JTrtk"]
[3250,null,603,"JTr","LC006","Talkeetna Formation?","Jurassic volcanic and volcaniclastic rocks","Jurassic and Triassic",null,null,"Lake Clark","Igneous",null,"JTrtk"]
[3250,null,729,"Jtku","LC007","Talkeetna Formation, undivided","Tuff, sandstone, agglomerate, breccia and some lava flows","Early Jurassic",null,null,"Lake Clark","Igneous",null,"JTrtk"]
[3250,null,67,"Jt","SV002","Talkeetna Formation","Mainly volcanic breccia, agglomerate, lava flows, and tuff.  Sedimentary rocks locally interbedded but are minor.  Informally divided into three members, which correlate with formal members elsewhere.  Includes informally named Pogibshi Formation on east","Early Jurassic (Hettangian to Toarcian)",null,null,"Seldovia","Igneous",null,"JTrtk"]
[3250,null,529,"Jtku","SV004","Talkeetna Formation, undivided","Tuff, sandstone, agglomerate, breccia and some lava flows","Early Jurassic",null,null,"Seldovia","Igneous",null,"JTrtk"]
[3251,null,526,"Jtkh","IL007","Talkeetna Formation, Horn Mountain Tuff Member","Mottled andesitic tuff, tuffaceous sandstone, and siltstone, locally contains andesitic flows","Early Jurassic",null,null,"Iliamna","Sedimentary",null,"JTrtk"]
[3251,null,526,"Jtkh","KN005","Talkeetna Formation, Horn Mountain Tuff Member","Mottled andesitic tuff, tuffaceous sandstone, and siltstone, locally contains andesitic flows","Early Jurassic",null,null,"Kenai","Sedimentary",null,"JTrtk"]
[3252,null,527,"Jtkp","IL007","Talkeetna Formation, Portage Creek Agglomerate Member","Massive pink agglomerate and some volcanic breccia; minor andesitic flows, locally metasedimentary rock","Early Jurassic",null,null,"Iliamna","Igneous",null,"JTrtk"]
[3252,null,527,"Jtkp","KN005","Talkeetna Formation, Portage Creek Agglomerate Member","Massive pink agglomerate and some volcanic breccia; minor andesitic flows, locally metasedimentary rock","Early Jurassic",null,null,"Kenai","Igneous",null,"JTrtk"]
[3253,null,528,"Jtkm","IL007","Talkeetna Formation, Marsh Creek Breccia Member","Massive green volcanic breccia, lava flows, in part of submarine origin, interbedded with argillite and meta tuff, low rank metamorphism mainly confined to lower part","Early Jurassic",null,null,"Iliamna","Igneous",null,"JTrtk"]
[3253,null,528,"Jtkm","KN005","Talkeetna Formation, Marsh Creek Breccia Member","Massive green volcanic breccia, lava flows, in part of submarine origin, interbedded with argillite and meta tuff, low rank metamorphism mainly confined to lower part","Early Jurassic",null,null,"Kenai","Igneous",null,"JTrtk"]
[3260,null,1915,"MzPzgps","TA019","Phyllite argillite, and chert","Gray to black phyllite or slaty argillite, occasionally calcareous or sulfide-bearing along fault zones","Early Jurassic or Late Triassic?","Age based on Box and others (1993) Bethel map, Early Jurassic radiolarians",null,"Taylor Mountains","Sedimentary",null,null]
[3380,null,125,"Jtr","IL002","Trondhjemite","Medium- to coarse-grained, light-gray muscovite bearing trondhjemite","Late Jurassic",null,"K-Ar muscovite age of 145 Ma","Iliamna","Igneous",null,"Jtr"]
[3380,null,1204,"Jth","KN012","Trondjemite","Trondjemite","Jurassic",null,null,"Kenai","Igneous",null,null]
[3380,null,202,"Ji2","LC002","Jurassic intrusive rocks -- Unit 2 Trondhjemite","Medium- to coarse-grained, seriate, leucocratic trondhjemite","Jurassic",null,"A sample from the Iliamna quadrangle yielded a 145 Ma K-Ar age on muscovite","Lake Clark","Igneous",null,"Jtr"]
[3380,null,1104,"Jth","LC011","Trondjemite","Trondjemite","Jurassic",null,null,"Lake Clark","Igneous",null,null]
[3400,null,809,"Jg","IL008","Granitic rocks","Granitic rocks of the Alaska-Aleutian Range batholith","Jurassic",null,null,"Iliamna","Igneous",null,null]
[3400,null,11340,"Jg","KN011","Granitic rocks","Granitic rocks of the Alaska-Aleutian Range batholith","Jurassic",null,null,"Kenai","Igneous",null,null]
[3400,null,602,"Jg","LC006","Jurassic granitic rocks","Jurassic granitic rocks","Jurassic",null,null,"Lake Clark","Igneous",null,"Jqd"]
[3400,null,10340,"Jg","LC010","Granitic rocks","Granitic rocks of the Alaska-Aleutian Range batholith","Jurassic",null,null,"Lake Clark","Igneous",null,null]
[3401,null,115,"J(?)f","SV002","Felsite","Fine-grained aphanitic, light gray felsite","Jurassic? or early Tertiary?",null,null,"Seldovia","Igneous",null,"Jgr"]
[3402,null,126,"Jqm","IL002","Quartz monzonite","Medium-grained, light-gray with a pinkish cast quartz monzonite, locally includes granodiorite and trondhjemite.","Late Jurassic",null,null,"Iliamna","Igneous",null,"Jgd"]
[3402,null,532,"Jqm","IL007","Quartz monzonite","Medium- to coarse-grained pink to gray granitic-textured quartz monzonite","Jurassic",null,null,"Iliamna","Igneous",null,"Jgd"]
[3402,null,536,"p","IL007","Pegmatite or aplite dikes","Pegmatite or aplite dikes","Jurassic",null,null,"Iliamna","Igneous",null,null]
[3402,null,3402,"Jgd","KN002","Quartz monzonite","Quartz monzonite","Jurassic",null,null,"Kenai","Igneous",null,"Jgd"]
[3402,null,532,"Jqm","KN005","Quartz monzonite","Medium- to coarse-grained pink to gray granitic-textured quartz monzonite","Jurassic",null,null,"Kenai","Igneous",null,"Jgd"]
[3402,null,203,"Ji3","LC002","Jurassic intrusive rocks -- Unit 3 Granodiorite","Whitish-gray, medium-grained, seriate biotite granodiorite.","Jurassic",null,null,"Lake Clark","Igneous",null,"Jgd"]
[3402,null,738,"pg","LC007","Pink quartz monzonite dikes","Pink quartz monzonite dikes","Jurassic",null,null,"Lake Clark","Igneous",null,null]
[3403,null,127,"Jqd","IL002","Quartz diorite","Medium- to coarse-grained, light-gray quartz diorite that contains biotite and hornblende, locally includes small areas of diorite and granodiorite.","Late Jurassic",null,"Multiple K-Ar ages ranging form 168 Ma on hornblende to 152 Ma on biotite.  Analytically best ages cluster around 155 to 158 Ma","Iliamna","Igneous",null,"Jqd"]
[3403,null,533,"Jqd","IL007","Quartz diorite","Mainly biotite-hornblende-quartz dioriite","Jurassic",null,null,"Iliamna","Igneous",null,"Jqt"]
[3403,null,3403,"Jqd","KN002","Quartz diorite, diorite, and granodiorite","Quartz diorite, diorite, and granodiorite","Jurassic",null,null,"Kenai","Igneous",null,"Jqd"]
[3403,null,201,"Ji1","LC002","Jurassic intrusive rocks -- Unit 1 Tonalite","Medium-grained tonalite and quartz diorite, locally foliated.  Two small exposures of gabbro and diorite included in unit.","Jurassic",null,null,"Lake Clark","Igneous",null,"Jqd"]
[3404,null,533,"Jqd","KN005","Quartz diorite","Mainly biotite-hornblende-quartz dioriite","Jurassic",null,null,"Kenai","Igneous",null,"Jqt"]
[3404,null,537,"di","KN005","Quartz diroite dikes","Quartz diorite dikes","Jurassic",null,null,"Kenai","Igneous",null,"Jqt"]
[3404,null,903,"Ju","KN009","Plutonic rocks, undivided","Plutonic rocks, undivided; chiefly tonalite and trondhjemite","Jurassic",null,null,"Kenai","Igneous",null,null]
[3404,null,1205,"JT","KN012","Tonalite","Tonalite, includes hornblendite, hornblende-biotite quartz diorite, and rare granodiorite, quartz monzonite, and granite","Jurassic",null,null,"Kenai","Igneous",null,null]
[3404,null,733,"Jqd","LC007","Quartz diorite","Mainly biotite-hornblende-quartz dioriite","Jurassic",null,null,"Lake Clark","Igneous",null,"Jqt"]
[3404,null,1105,"JT","LC011","Tonalite","Tonalite, includes hornblendite, hornblende-biotite quartz diorite, and rare granodiorite, quartz monzonite, and granite","Jurassic",null,null,"Lake Clark","Igneous",null,null]
[3404,null,111,"Jd","SV002","Diorite of Point Bede","Fine- to medium-grained nonfoliated quartz diorite.","Jurassic?",null,null,"Seldovia","Igneous",null,"Jqt"]
[3404,null,116,"Jto","SV002","Tonalite of Dogfish Bay","Medium-grained nonfoliated tonalite.","Jurassic?",null,null,"Seldovia","Igneous",null,"Jqt"]
[3405,null,128,"Jd","IL002","Diorite","Medium- to coarse-grained diorite, locally includes small areas of quartz diorite and gabbro; numerous xenoliths.","Late Jurassic",null,null,"Iliamna","Igneous",null,"Jmu"]
[3420,null,534,"la","IL007","Lamprophyre dikes","Lamprophyre dikes","Jurassic",null,null,"Iliamna","Igneous",null,"Ji"]
[3420,null,535,"b","IL007","Basalt dikes","Basalt dikes","Jurassic",null,null,"Iliamna","Igneous",null,"Ji"]
[3420,null,534,"la","KN005","Lamprophyre dikes","Lamprophyre dikes","Jurassic",null,null,"Kenai","Igneous",null,"Ji"]
[3420,null,734,"la","LC007","Lamprophyre dikes","Lamprophyre dikes","Jurassic",null,null,"Lake Clark","Igneous",null,"Ji"]
[3450,null,500,"mi","DI002","Mafic igneous rocks","Predominantly diabase, probably intrusive.  Associated with silicious sedimentary and extrusive rocks of now abandoned Gemuk Group of questioned Jurassic age.","Jurassic?",null,null,"Dillingham","Igneous",null,"Jvab"]
[3495,null,129,"Jm","IL002","Mafic and ultramafic plutonic rocks","Gabbro, hornblende gabbro, hornblendite, and pyroxenite","Early Jurassic",null,"K-Ar age of 183 Ma on hornblende","Iliamna","Igneous",null,"Jmu"]
[3610,null,10,"Jsm","SV002","Seldovia metamorphic complex","Marble, quartzite, garnet-mica schist, and glaucophane-bearing amphibolite","Early Jurassic",null,"191.1 and 191.7 Ar-Ar on white mica and 191.9 Ar-Ar on hornblende","Seldovia","Metamorphic",null,"Jsch"]
[3821,null,3821,"eJTrl","TA008","Limestone, shale, and chert","Cream colored to dark-gray, limestone, shale, and chert.","Early Jurassic? and Triassic -- Norian","Triassic (Norian) fossils collected by Blodgett amd Blome",null,"Taylor Mountains","Sedimentary",null,"eJTrl"]
[4011,null,2004,"Trgl","TA020","Gemuk Group, limestone and chert","Interbedded limestone, fossiliferous argillaceous limestone, and gray-green chert","Triassic","Monotis and Halobia",null,"Taylor Mountains","Sedimentary",null,null]
[4012,null,4020,"Trlc","TA008","Triassic limestone and chert","Cream colored to dark-gray, limestone, and chert, locally interbedded in thin repeating beds.","Triassic (Norian)","Triassic (Norian) fossils collected by Blodgett amd Blome",null,"Taylor Mountains","Sedimentary",null,"Trk?"]
[4012,null,4023,"Trlt","TA008","Limestone","Newly described limestone, faunally distinct from limestone and chert section.  Only known from the TA D-2 and D-3 quadrangles","Triassic","Relatively abundant fauna, to be described",null,"Taylor Mountains","Sedimentary",null,null]
[4020,null,4020,"Trk","KN002","Kamishak Formation","Limestone, grey to black chert, and porcellanite","Late Triassic",null,null,"Kenai","Sedimentary",null,"Trk"]
[4020,null,1215,"St","LC012","Limestone","Highly fractured dark-gray limestone and chert","Silurian","Contains stromatoporoids (undet.), solitary rugose coral, Pentameris(?) sp. and undet. rynchonelloid brachiopods at one fossil locality",null,"Lake Clark","Sedimentary",null,null]
[4020,null,60,"JTrp","SV002","Port Graham Formation of Kelley (1980)","Dark-gray, carbonaceous limestone and silty limestone, also includes tuff, tuffaceous sedimentary rocks, and chert.  Most of unit considered Norian in age.","Early Jurassic and Late Triassic","Bivalves of Late Triassic (Norian) age",null,"Seldovia","Sedimentary",null,"JTrta"]
[4022,null,130,"Trku","IL002","Kamishak Formation -- Ursus Member","Thin-bedded, light-gray limestone (locally dolomitic), and minor interbedded gray chert and porcellanite and minor tuff.  Limestone is fine-grained biomicrite.  Depositional environment was moderate to high-energy, shallow water.  Unit cut by abundant di","Late Triassic? or Early Jurassic?","None definitive",null,"Iliamna","Sedimentary",null,"Trk"]
[4023,null,131,"Trkm","IL002","Kamishak Formation -- Middle Member","Thin- to medium-bedded, dark-gray to black limestone and calcilutite (locally dolomitic), and minor black chert and gray tuff.  Limestone is fine-grained microsparite.  Calcite is locally altered to chert, suggesting a deep-basin environment.  Unit cut b","Late Triassic (middle to late Norian)","Corals: Koilocenia cf. K. andreai (Volz), Oppelismilia cf. O. mojsvari (Frech), and Thamnasteria sp.; hydrozoan Heterastridium cf. H. conglobotum Reuss and Monotis subcircularis Gabb",null,"Iliamna","Sedimentary",null,"Trk"]
[4024,null,132,"Trkb","IL002","Kamishak Formation -- Briun Limestone Member","Massive to thin-bedded, light- to dark-gray limestone; coral and echinoid bioherms, banded green and white chert.  Environment was apparently high energy, shallow water.  Unit cut by abundant dikes and sills either related to the Cottonwood Bay Greenston","Late Triassic (Norian)","Halobia cf. H. dilatata and Monotis(?) sp.",null,"Iliamna","Sedimentary",null,"Trk"]
[4035,null,301,"KCg2","DI002","Gemuk Group -- Triassic limestone","Generally white to cream colored, recrystallized limestone, however locally is dark gray and only finely crystalline.  Possibly fault bounded occurrences.","Triassic (Norian)","Triassic (Norian) fossils collected by Mertie",null,"Dillingham","Sedimentary",null,"Trk?"]
[4035,null,135,"Trvs","DI003","Volcanic and sedimentary rocks","Marine unit consisting of chert, tuffaceous cherty rocks, argillite, siltstone, volcanic wacke, conglomerate, limestone, and mafic flows and breccias.","Triassic","Pelecypods of Late Triassic age",null,"Dillingham","Sedimentary",null,"Trcg"]
[4035,null,184,"KCg2","TA002","Gemuk Group -- Triassic limestone","Generally white to cream colored, recrystallized limestone, however locally is dark gray and only finely crystalline.  Possibly fault bounded occurrences.","Triassic (Norian)","Triassic (Norian) fossils collected by Mertie",null,"Taylor Mountains","Sedimentary",null,"Trk?"]
[4050,null,5050,"Trsh","LC005","Gray shale and gray volcaniclastic sandstone","Gray shale and gray volcaniclastic sandstone.  Inferred on basis of Eakins and others (1978).","Triassic",null,null,"Lake Clark","Sedimentary",null,null]
[4050,null,1212,"Ssh","LC012","Gray shale and gray volcaniclastic sandstone","Gray shale and gray volcaniclastic sandstone","Silurian",null,null,"Lake Clark","Sedimentary",null,null]
[4215,"Q",1515,"Trb","TA015","Volcanic rocks","Volcanic rocks within former Gemuk Group.  Inferred from extrapolation of Hoare and Condon field notes.","Triassic",null,null,"Taylor Mountains","Igneous",null,"Trb"]
[4215,null,17001,"KTrPCg","TA017","Gemuk Group -- basalt","Volcanic rocks comprising at least 5 separate flows, locally as much as 200 feet think interbedded with cherty siltstone.  Thought to occur stratigraphically near top of Gemuk section.","Triassic","Associated Monotis and Halobia, late Triassic",null,"Taylor Mountains","Igneous",null,"Trb"]
[4215,null,19001,"Trv","TA019","Basalt","Volcanic rocks comprising at least 5 separate flows, locally as much as 200 feet think interbedded with cherty siltstone.  Thought to occur stratigraphically near top of Gemuk section.","Triassic","Associated Monotis and Halobia, late Triassic",null,"Taylor Mountains","Igneous",null,"Trb"]
[4425,null,5025,"Trv","DI005","Mafic igneous rocks","Predominantly basaltic flows and volcaniclastic rocks.  May be equilvalent to the Chilikadrotna Greenstone of Triassic age.","Jurassic? or Triassic?",null,null,"Dillingham","Igneous",null,"Trc"]
[4425,null,133,"Trc","IL002","Cottonwood Bay Greenstone","Dark-gray to dark-green porphyritic to amygdaloidal basaltic flows altered to greenstone.  In general, slightly more metamorphosed than Nikolai Greenstone.","Late Triassic (pre-Norian?)",null,null,"Iliamna","Metamorphic",null,"Trc"]
[4425,null,220,"Sc","LC002","Chilikadrotna Greenstone","Basalt, andesite, chert, limestone, and tuffaceous sedimentary rock, all weakly metamorphosed.  About 60 percent of unit is metabasalt","Triassic","Unit originally assigned a Silurian age, was later found to be in error and is now considered Triassic.",null,"Lake Clark","Igneous",null,"Trc"]
[4425,null,301,"JTrv","LC003","Chilikadrotna Greenstone","Basaltic pillows and flows, andesitic breccia, chert, and limestone.","Jurassic and Triassic",null,null,"Lake Clark","Igneous",null,"Trc"]
[4425,null,5425,"Sg","LC005","Greenstone, dark-green basalt","Dark-green basalt having relict pillow structures, containes minor red and balck chert.  Inferred on basis of Eakins and others (1978).","Silurian",null,null,"Lake Clark","Metamorphic",null,null]
[4425,null,604,"JTrca","LC006",null,"Unknown","Jurassic and Triassic",null,null,"Lake Clark","Metamorphic",null,"Trc"]
[4425,"Q",605,"JTrca?","LC006",null,"Unknown","Jurassic and Triassic",null,null,"Lake Clark","Metamorphic",null,"Trc"]
[4425,null,625,"Trcb","LC006","Cottonwood Bay Greenstone","Greenstone","Triassic",null,null,"Lake Clark","Igneous",null,"Trc"]
[4425,null,626,"Trcb + MzPzp","LC006","Cottonwood Bay Greenstone and ?","Greenstone and ?","Triassic",null,null,"Lake Clark","Metamorphic",null,"Trc"]
[4425,null,627,"Trcb?","LC006","Cottonwood Bay Greenstone","Greenstone","Triassic",null,null,"Lake Clark","Igneous",null,"Trc"]
[4425,null,1213,"Sg","LC012","Greenstone, dark-green basalt","Dark-green basalt having relict pillow structures, containes minor red and balck chert","Silurian",null,null,"Lake Clark","Metamorphic",null,null]
[4425,null,1214,"Spb","LC012","Greenstone, purple basalt","Purple basalt and hematite rich sandstone","Silurian",null,null,"Lake Clark","Metamorphic",null,null]
[4425,null,15425,"Trv","TA015","Mafic igneous rocks","Predominantly mafic flows and volcaniclastic rocks.  May be associated with the Chilikadrotna Greenstone of Triassic age from the Lake Clark quadrangle.","Triassic?",null,null,"Taylor Mountains","Igneous",null,"Trc"]
[4710,null,186,"KCg","TA002","Gemuk Group -- undivided","Primarily coarse-grained clastic rocks containing some fine-grained cherty and volcanic material.","Probably Cretaceous to Triassic","Early Cretaceous (Valanginian), Jurassic, and Triassic",null,"Taylor Mountains","Sedimentary",null,"MzPzgs"]
[4710,"HFS",1204,"h","TA012","Hornfels","Contact metamorphic zones adjacent to igneous intrusive rocks.  (Note, in this quadrangle, probably includes both Kuskokwim and Gemuk units, hence source rock are in part older than Cretaceous).","Cretaceous",null,null,"Taylor Mountains","Metamorphic",null,"MzPzgs"]
[4710,null,1205,"s","TA012","Sedimentary rocks","Interbedded graywacke and shale, with local interbeds of argillite and conglomerate.  In this quadrangle, most certainly includes rocks of the Gemuk Group and to a lesser extent Kuskkwim Group.","Cretaceous",null,null,"Taylor Mountains","Sedimentary",null,"MzPzgs"]
[4710,null,2003,"Trg","TA020","Gemuk Group, undifferentiated","Graywacke, siltstone and lesser amounts of chert, tuff, shale, and black limestone","Triassic",null,null,"Taylor Mountains","Sedimentary",null,null]
[4711,null,2005,"Trgv","TA020","Gemuk Group, sedimentary and volcanic rocks","Graywacke, siltstone, and volcanic rocks, including lava and tuff, interbedded with black shale, black limestone, argillaceous limestone, and chert","Triassic","Monotis and Halobia",null,"Taylor Mountains","Sedimentary",null,null]
[4880,null,112,"Mg","SV002","Gabbro","Dark-green, medium- to coarse-grained gabbro and minor leucogabbro and plagiogranite.  Associated with McHugh Complex as fault-bounded bodies.","Mesozoic",null,null,"Seldovia","Igneous",null,"Mzm"]
[4890,null,110,"Mu","SV002","Ultramafic plutonic rocks","Predominantly layered, variably serpentinized dunite containing rare to locally abundant layers of chromitite and pyroxenite and fault slices of garnet pyroxenite and serpintinite.  Associated with McHugh Complex as fault-bounded bodies.","Mesozoic",null,null,"Seldovia","Igneous",null,"Mzum"]
[4950,null,303,"KCg4","DI002","Gemuk Group -- Mississippian(?) rocks","Consists of massive and thin-bedded chert interbedded with siltstone and graywacke (generally calcareous), thin-bedded limestone, and minor mafic volcanic rocks.  Chert is black, white, and gray and specifically not green, which is characteristic of youn","Mississippian?",null,null,"Dillingham","Sedimentary",null,"MzPzm"]
[4950,null,145,"MzPz","DI003","Mesozoic and Paleozoic rocks, undivided","Thick, widespread, marine unit consisting of volcanic and sedimentary rocks ranging in age from Early (?) Ordovician to Early Cretaceous.  Unit consists of thin-bedded to massive tuffaceous cherts and siltstones, argillite, graywacke, pebble-cobble congl","Early Cretaceous to Early? Ordovician","Limestones commonly contain Permian fossils",null,"Dillingham","Sedimentary",null,"MzPzm"]
[4950,null,5145,"MzPz","DI005","Mesozoic and Paleozoic rocks, undivided","Thick, widespread, marine unit consisting of volcanic and sedimentary rocks ranging in age from Early (?) Ordovician to Early Cretaceous.  Unit consists of thin-bedded to massive tuffaceous cherts and siltstones, argillite, graywacke, pebble-cobble congl","Early Cretaceous to Early? Ordovician","Limestone commonly contains Permian fossils",null,"Dillingham","Sedimentary",null,"MzPzm"]
[4950,null,7145,"MzPz","DI007","Mesozoic and Paleozoic rocks, undivided","Thick, widespread, marine unit consisting of volcanic and sedimentary rocks ranging in age from Early (?) Ordovician to Early Cretaceous.  Unit consists of thin-bedded to massive tuffaceous cherts and siltstones, argillite, graywacke, pebble-cobble congl","Early Cretaceous to Early? Ordovician","Limestones commonly contain Permian fossils",null,"Dillingham","Sedimentary",null,"MzPzm"]
[4950,null,182,"KCg4","TA002","Gemuk Group -- Mississippian(?) rocks","Consists of massive and thin-bedded chert interbedded with siltstone and graywacke (generally calcareous), thin-bedded limestone, and minor mafic volcanic rocks.  Chert is black, white, and gray and specifically not green, which is characteristic of youn","Mississippian?",null,null,"Taylor Mountains","Sedimentary",null,"MzPzm"]
[4950,null,182,"MzPz","TA003","Predominantly graywacke, fractured argillite, and chert (undivided)","Predominantly graywacke, fractured argillite, and chert (undivided)","Mississippian?",null,null,"Taylor Mountains","Sedimentary",null,"MzPzm"]
[4950,null,6182,"MzPz","TA006","Mesozoic and Paleozoic rocks, undivided","Thick, widespread, marine unit consisting of volcanic and sedimentary rocks ranging in age from Early (?) Ordovician to Early Cretaceous.  Unit consists of thin-bedded to massive tuffaceous cherts and siltstones, argillite, graywacke, pebble-cobble congl","Early Cretaceous to Early? Ordovician","Limestones commonly contain Permian fossils",null,"Taylor Mountains","Tectonite",null,"MzPzm"]
[4950,null,1901,"Mzm","TA019","Melange","Two or more rock types occuring in close proximity, typically tightly folded, sheared, and/or altered, including basalt (+/- pillows), gabbro, greywacke, shale, siltstone, limestone, and dolomite.","Mesozoic?",null,null,"Taylor Mountains","Tectonite",null,null]
[5060,null,1300,"KCg1","DI002","Gemuk Group -- massive coarse-grained clastic rocks","Massive, coarse-grained sandstone, quartzite, and conglomerate.","Probably Cretaceous to Triassic","Early Cretaceous (Valanginian), Jurassic, and Triassic",null,"Dillingham","Sedimentary",null,"TrDs"]
[5060,null,2300,"KCg1","DI002","Gemuk Group -- bedded clastic rocks","Well-bedded, fine-grained sedimentary rocks, based on airphoto interpretation.","Probably Cretaceous to Triassic","Early Cretaceous (Valanginian), Jurassic, and Triassic",null,"Dillingham","Sedimentary",null,"TrDs"]
[5200,null,616,"MzPzp","LC006","Metamorphic rocks?","Metamorphic rocks?","Mesozoic and Paleozoic",null,null,"Lake Clark","Metamorphic",null,null]
[5200,null,1211,"MzPzs","LC012","Biotite-feldspar-quartz schist","Biotite-feldspar-quartz schist, locally actinolite-feldspar-quartz schist or garnet-feldspar-quartz schist.","Mesozoic and Paleozoic",null,null,"Lake Clark","Metamorphic",null,null]
[5220,null,123,"Jmg","IL002","Migmatite","Admixture of intrusive and metamorphic rocks, grading from gneissic to schistose texture, exposed along east margin of Alaska-Aleutian Range batholith.","Middle and Early Jurassic",null,null,"Iliamna","Metamorphic",null,"?"]
[5220,null,140,"JPk","IL002","Kakhonak Complex","Exposed chiefly as roof pendants in Alaska-Aleutian Range batholith and consists of schist, gneiss, quartzite, marble, phyllite, argillite, and slate.  Greenschist facies metamorphic grade.  Metamorphic rocks are thought to equivalent to Jurassic and Tri","Jurassic, Triassic, and Permian?",null,null,"Iliamna","Metamorphic",null,"JPzk"]
[5220,null,530,"Trm","IL007","Metamorphic rocks, undivided","Metalimestone, argillite, quartzite, metatuff, greenstone, and phyllite; may in part be equivalent to the Kamishak Formation","Late? Triassic",null,null,"Iliamna","Metamorphic",null,"Trk"]
[5220,null,811,"Jm","IL008","Metamorphic rocks","Metamorphic rocks, undifferentiated","Jurassic",null,null,"Iliamna","Metamorphic",null,null]
[5220,null,530,"Trm","KN005","Metamorphic rocks, undivided","Metalimestone, argillite, quartzite, metatuff, greenstone, and phyllite; may in part be equivalent to the Kamishak Formation","Late? Triassic",null,null,"Kenai","Metamorphic",null,"Trk"]
[5220,null,906,"as","KN009","Amphibolite","Amphibolite, locally includes sedimentary rocks","early Mesozoic?",null,null,"Kenai","Metamorphic",null,null]
[5220,null,302,"TrPztc","LC003","Tlikakila Complex","A diverse complex of metamorphosed and highly deformed rocks, whose protoliths include calcerous to siliceous clastic rocks, limestone, thin-bedded chert, massive basalt, massive to layered gabbro and pyroxenite, and ultramafic rocks.  Most of complex me","Triassic to Paleozoic","Late Triassic megafossils and conodonts from limestone; clearly a protolith age.",null,"Lake Clark","Metamorphic",null,"JPzk"]
[5220,null,402,"TrPztc","LC004","Tlikakila Complex","A diverse complex of metamorphosed and highly deformed rocks, whose protoliths include calcerous to siliceous clastic rocks, limestone, thin-bedded chert, massive unpillowed basalt, massive to layered gabbro and pyroxenite, and serpentinized ultramafic r","Triassic to Paleozoic",null,null,"Lake Clark","Metamorphic",null,"JPzk"]
[5220,"HFS",619,"TC","LC006","Tlikakila Complex","Complex assemblage of metamorphiosed and hornfels(?) volcanic and sedimentary rocks","Jurassic and older?",null,null,"Lake Clark","Tectonite",null,"JPzk"]
[5240,null,210,"MzPzm","LC002","Metamorphosed mafic volcanic rocks, phyllite, schist, quartzite, marble, calc-silcate rocks, serpentinite, gabbro, and chert","Metamorphosed mafic volcanic rocks, phyllite, schist, quartzite, marble, calc-silcate rocks, serpentinite, gabbro, and chert.  Mixed unit of varying affinity and protolith and metamorphic age.  Dominant rock of unit is metamorphosed mafic volcanic rocks","Mesozoic and Paleozoic",null,null,"Lake Clark","Metamorphic",null,"MzPzb"]
[5240,"Q",55240,"MzPzm","LC005","Mafic metamorphic rocks?","Mafic rocks?","Mesozoic and Paleozoic",null,null,"Lake Clark","Metamorphic",null,"MzPzb"]
[5240,"Q",614,"M","LC006","Mafic metamorphic rocks?","Mafic rocks?","Mesozoic",null,null,"Lake Clark","Metamorphic",null,"MzPzb"]
[5240,null,615,"MzPzm","LC006","Mafic metamorphic rocks?","Mafic rocks?","Mesozoic and Paleozoic",null,null,"Lake Clark","Metamorphic",null,"MzPzb"]
[5380,null,1904,"ePzc","DI005","Black chert","Predominantly of black and gray chert but also includes rare white, buff, red, or green bedded to massive chert.  It is occasionally vitreous, banded or fractured, and is interbedded with minor amounts of limestone, amygdaloidal basalt, and thin pitted c","Ealry Paleozoic",null,"Hoare and Jones (1981) report Lower Paleozoic (Devonian? and pre-Devonian) and Paleozoic(?) radiolarians from this unit as well as Permian megafossils.","Dillingham","Metamorphic",null,null]
[5380,null,1904,"ePzc","TA019","Black chert","Predominantly of black and gray chert but also includes rare white, buff, red, or green bedded to massive chert.  It is occasionally vitreous, banded or fractured, and is interbedded with minor amounts of limestone, amygdaloidal basalt, and thin pitted c","Ealry Paleozoic",null,"Hoare and Jones (1981) report Lower Paleozoic (Devonian? and pre-Devonian) and Paleozoic(?) radiolarians from this unit as well as Permian megafossils.","Taylor Mountains","Metamorphic",null,null]
[5730,null,140,"Pl","DI003","Limestone","Thin, widespread, fine-grained, crystalline limestone.  Fetid odor.  Generally tuffaceous, locally cherty.","Permian",null,null,"Dillingham","Sedimentary",null,"Pls"]
[5730,null,7730,"Pl","DI007","Limestone","Thin, widespread, fine-grained, crystalline limestone.  Fetid odor.  Generally tuffaceous, locally cherty.","Permian",null,null,"Dillingham","Sedimentary",null,"Pls"]
[5730,null,6140,"Pl","TA006","Limestone","Thin, widespread, fine-grained, crystalline limestone.  Fetid odor.  Generally tuffaceous, locally cherty.","Permian",null,null,"Taylor Mountains","Sedimentary",null,"Pls"]
[5730,null,15140,"Pl","TA015","Limestone","Thin, widespread, fine-grained, crystalline limestone.  Fetid odor.  Generally tuffaceous, locally cherty.","Permian",null,null,"Taylor Mountains","Sedimentary",null,"Pls"]
[5730,null,17140,"Pl","TA017","Limestone","Thin, widespread, fine-grained, crystalline limestone.  Fetid odor.  Generally tuffaceous, locally cherty.","Permian",null,null,"Taylor Mountains","Sedimentary",null,"Pls"]
[5730,null,1911,"Pl","TA019","Limestone","Thin, widespread, fine-grained, crystalline limestone.  Fetid odor.  Generally tuffaceous, locally cherty.","Permian","Reported brachipods and crinoids",null,"Taylor Mountains","Sedimentary",null,"Pls"]
[5745,null,1902,"Pcs","DI005","Clastic rocks","Predominantly fine to coarse-grained, rarely conglomeratic or brecciated, light gray, greenish-gray, or black streaky, slaty, phyllitic, micaceous or silty bedded to massive graywacke.  Cigar sized and shaped pits, boudins, or slightly hornfelsed in some","Permian?","Associated Permian limestone containing Atomodesma",null,"Dillingham","Sedimentary",null,null]
[5745,null,1902,"Pcs","TA019","Clastic rocks","Predominantly fine to coarse-grained, rarely conglomeratic or brecciated, light gray, greenish-gray, or black streaky, slaty, phyllitic, micaceous or silty bedded to massive graywacke.  Cigar sized and shaped pits, boudins, or slightly hornfelsed in some","Permian?","Associated Permian limestone containing Atomodesma",null,"Taylor Mountains","Sedimentary",null,null]
[5810,null,302,"KCg3","DI002","Gemuk Group -- Permian volcanic rocks","Predominantly dark-green to black, altered mafic volcanic rocks having abundant amygdules.  Volcanic breccia, calcareous tuff, and pillow lava constitute lower beds, pillow lavas in middle, and phyllitic calcareous tuff and tuffaceous limestone constitut","Permian? and Triassic?",null,null,"Dillingham","Igneous",null,"Pv"]
[5810,null,137,"Pv","DI003","Gemuk Group -- Permian volcanic rocks","Predominantly dark-green to black, altered mafic volcanic rocks having abundant amygdules.  Volcanic breccia, calcareous tuff, and pillow lava constitute lower beds, pillow lavas in middle, and phyllitic calcareous tuff and tuffaceous limestone constitut","Permian? and Triassic?",null,null,"Dillingham","Igneous",null,"Pv"]
[5810,null,185,"KCg3","TA002","Gemuk Group -- Permian volcanic rocks","Predominantly dark-green to black, altered mafic volcanic rocks having abundant amygdules.  Volcanic breccia, calcareous tuff, and pillow lava constitute lower beds, pillow lavas in middle, and phyllitic calcareous tuff and tuffaceous limestone constitut","Permian? and Triassic?",null,null,"Taylor Mountains","Igneous",null,null]
[5810,null,1913,"Pv","TA019","Permian volcanic rocks","Predominantly dark-green to black, altered mafic volcanic rocks having abundant amygdules.  Volcanic breccia, calcareous tuff, and pillow lava constitute lower beds, pillow lavas in middle, and phyllitic calcareous tuff and tuffaceous limestone constitut","Permian? and Triassic?",null,null,"Taylor Mountains","Igneous",null,null]
[6080,null,1903,"Mrc","TA019","Rainbow chert","Mostly highly deformed white, gray, red, and minor green or black, thin-bedded to massive chert.  It is locally banded or brecciated and interbedded with minor red siliceous shale, argillite, dolomitic limestone, greywacke, and rare red volcanic rocks an","Mississppian?","Associated and presumably overlying limestone has yielded Permian megafossils (Hoare and Jones, 1981).  One locality on the shore of Chikuminuk Lake yielded Triassic radiolaria, which is yet to be explained",null,"Taylor Mountains","Sedimentary",null,null]
[6412,null,1905,"MzPzgps","TA019","Greenstone, phyllite, and schist","Fine- to coarse-grained greenstone, occasionally calcareous or schistose, rarely interbedded with green chert, argillite and tuff.  Gray to black phyllite or slaty argillite, occasionally calcareous or sulfide-bearing along fault zones.  Greenschist with","Mesozoic or Paleozoic",null,null,"Taylor Mountains","Metamorphic",null,null]
[6617,null,200,"Sab","TA007","Algal boundstone","Thick to massive bedded, light gray algal boundstone, locally dolomitized; composed primarily of spongiostromate algal heads (including abundant oncoid forms).  Equivalent to Sl of Gilbert (1981)","Late Silurian (Ludlovian-Pridolian)","Aphrosalpingid sponges (notably Aphrosalpinx textilis Miagkova) locally common.  Moinr accessory brachiopods",null,"Taylor Mountains","Sedimentary",null,"Sab"]
[6617,null,8200,"Sab","TA008","Algal boundstone","Thick to massive bedded, light gray algal boundstone, locally dolomitized; composed primarily of spongiostromate algal heads (including abundant oncoid forms).  Equivalent to Sl of Gilbert (1981)","Late Silurian (Ludlovian-Pridolian)","Aphrosalpingid sponges (notably Aphrosalpinx textilis Miagkova) locally common.  Moinr accessory brachiopods",null,"Taylor Mountains","Sedimentary",null,"Sab"]
[6617,null,15667,"Sab","TA015","Algal boundstone","Thick to massive bedded, light gray algal boundstone, locally dolomitized; composed primarily of spongiostromate algal heads (including abundant oncoid forms).  Inferred from air photos","Late Silurian (Ludlovian-Pridolian)","Aphrosalpingid sponges (notably Aphrosalpinx textilis Miagkova) locally common.  Moinr accessory brachiopods",null,"Taylor Mountains","Sedimentary",null,"Sab"]
[6620,null,300,"Sls","TA007","Lime mudstone","Thin- to medium-bedded, laminated, dark gray to dark brown, platy lime mudstone, having strong petroliferous odor.  Coarse-grained limstone debris-flows having clasts of algal boundstone reef material common in uppermost part of unit; immediately below c","Late Silurian (Wenlockian)","Graptolites and conodonts",null,"Taylor Mountains","Sedimentary",null,"Spf"]
[6620,null,8300,"Sls","TA008","Lime mudstone","Thin- to medium-bedded, laminated, dark gray to dark brown, platy lime mudstone, having strong petroliferous odor.  Coarse-grained limstone debris-flows having clasts of algal boundstone reef material common in uppermost part of unit; immediately below c","Late Silurian (Wenlockian)","Graptolites and conodonts",null,"Taylor Mountains","Sedimentary",null,"Spf"]
[7510,null,400,"Olss","TA007","Tcherskidium-bearing limestone","Brown, medium- to thick-bedded skeletal lime packstone to wackestone.","Late Ordovician (Ashgillian)","Abundant pentameroid brachiopods (Tcherskidium and Proconchidium (or Ecconchidium))",null,"Taylor Mountains","Sedimentary",null,"Olss"]
[7515,null,450,"Os","TA007","Shale","Extremely poorly exposed brown and gray 'chippy' shale, silty shale and silicified limestone","Ordovician",null,null,"Taylor Mountains","Sedimentary",null,"Os"]
[7515,null,451,"Ocs","TA008","Clastic rocks","Clastic rocks of middle Ordovician age","Middle Ordovician",null,null,"Taylor Mountains","Sedimentary",null,null]
[7560,null,500,"Oab","TA007","Algal boundstone and lime mudstone","Medium- to thick-bedded, dark-gray to brown algal thrombolites (boundstone) interbedded with light-gray weathering thin- to medium-bedded lime mudstone.","Early Ordovician","Trilobites",null,"Taylor Mountains","Sedimentary",null,"Oab"]
[7560,null,8500,"Oab","TA008","Algal boundstone and lime mudstone","Medium- to thick-bedded, dark-gray to brown algal thrombolites (boundstone) interbedded with light-gray weathering thin- to medium-bedded lime mudstone.","Early Ordovician","Trilobites",null,"Taylor Mountains","Sedimentary",null,"Oab"]
[7570,null,600,"Ols","TA007","Lime mudstone","Thin- to medium-bedded, yellow-gray weathering, dark-gray fresh, burrow mottled lime mudstone.  Peloidal mudstone locally common.","Early Ordovician","Gastropods and conodonts",null,"Taylor Mountains","Sedimentary",null,"Ols"]
[8014,null,8014,"Cls","TA008","Limestone","Medium- to thick-bedded, commonly light-gray to dark-gray, rarely pink weathering (light-gray fresh) lime mudstone having locally abundant, well developed wavy styolites.  Minor green-gray shale intervals present locally.","Cambriam, middle","Trilobites locally abundant and diverse in this subunit and are indicative of a Mayan (late Middle Cambrian age",null,"Taylor Mountains","Sedimentary",null,null]
[8015,null,8015,"Cls","TA008","Limestone and siliclastic rocks","Thin-bedded platy limestone associated with coarse-grained siliclastic sandstone and granule comglomerate, possible shale.","Cambriam, middle or early",null,null,"Taylor Mountains","Sedimentary",null,null]
[8340,null,195,"Pal","TA002","Holitna Group","Various types of limestone ranging from dense, fine-textured to more coarsely crystalline (recrystallized) types.  Recrystallized facies are partly dolomitic.  Massive limestone is predominant and forms prominent topographic features.  Thinly bedded vari","Devonian to Silurian","Predominatly stromatoporoids and corals but includes sponges, bryozoans, brachiopods, trilobites, and ostracodes.",null,"Taylor Mountains","Sedimentary",null,"DZn"]
[8340,null,195,"DSab","TA005","Algal boundstone","Algal boundstone","Early Devonian to Late Silurian",null,null,"Taylor Mountains","Sedimentary",null,"DZn"]
[8340,null,895,"ds","TA008","Dolostone","Dolostone","Paleozoic",null,null,"Taylor Mountains","Sedimentary",null,"DZn"]
[8340,"HFS",896,"Pzls","TA008","Marble","Hornfelsed carbonate rocks","Paleozoic",null,null,"Taylor Mountains","Metamorphic",null,null]
[9120,null,8420,"Zs","TA008","Dolostone, limestone, orthoquartzite, and minor chert","Medium-bedded, medium-gray, orange weathering dolostone, limestone, orthoquartzite, and minor chert.  Dolostone has locally abundant floating quartz grains, is locally trough cross-stratified, but also has well developed parallel laminations, low domal s","Proterozoic","None reported",null,"Taylor Mountains","Sedimentary",null,null]