Preliminary Geologic Map of the Cook Inlet region, Alaska - including parts of the Talkeetna Mountains, Tyonek, Anchorage, Lake Clark, Kenai, Seward, Iliamna, Seldovia, Mount Katmai, and Afognak 1:250,000-scale quadrangles

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Frequently-anticipated questions:


What does this data set describe?

    Title:
    Preliminary Geologic Map of the Cook Inlet region, Alaska - including parts of the Talkeetna Mountains, Tyonek, Anchorage, Lake Clark, Kenai, Seward, Iliamna, Seldovia, Mount Katmai, and Afognak 1:250,000-scale quadrangles
    Abstract:
    This data set creates an updated map of the Cook Inlet region, located at northern part of the Gulf of Alaska. Cook Inlet fills a largely Tertiary basin lying between two accreted belts of Mesozoic and younger rocks. Largely continental Tertiary sedimentary rocks filling the basin are important oil and gas resevoirs. Mesozoic and Cenozoic plutonic rocks of the Alaska-Aleutian Range batholith and the Early Jurassic Talkeetna magmatic arc bound the west and northern sides. The eastern and southern sides are bounded by late Cretaceous accretionary flysch and associated melange.

    This data set is a portion of a statewide geology database, which is being compiled by the U.S. Geological Survey's National Surveys and Analysis (S&A) project, whose goal is to compile geologic geochemical, geophysical, and other data.

  1. How should this data set be cited?

    Wilson, Frederic H., Hults, Chad P., Schmoll, Henry R., Haeussler, Peter J., Schmidt, Jeanine M., Yehle, Lynn A., and Labay, Keith A., 2009, Preliminary Geologic Map of the Cook Inlet region, Alaska - including parts of the Talkeetna Mountains, Tyonek, Anchorage, Lake Clark, Kenai, Seward, Iliamna, Seldovia, Mount Katmai, and Afognak 1:250,000-scale quadrangles: U.S. Geological Survey Open-File Report OFR 2009-1108.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -155.0
    East_Bounding_Coordinate: -148.0
    North_Bounding_Coordinate: 62.75
    South_Bounding_Coordinate: 58.5

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2009
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set.

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 5
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -153.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.9787.

  7. How does the data set describe geographic features?

    polygons
    Characteristics of the polygon features in the geology coverages are coded in the polygon attribute table. The table <cov>.pat includes the following items: CLASS, QCLASS, LITH2 (not used), SOURCE, NSACLASS, NSAMOD, LABEL, MIN_AGE, and MAX_age. (Source: this data set)

    NSACLASS
    NSACLASS is a positive integer value (4 5 B) item in the polygon attribute table. Values range discontinuously from 98 to 9322. NSACLASS is a numeric code for the geologic unit. This data set represents a generalized map, thus it is possible that a geologic unit is made of multiple NSACLASS values. Each NSACLASS on the Cook Inlet map matches with geologic unit labels in LABEL and has a minimum (MIN_AGE) and maximum (MAX_AGE) range, given in million of years (my). The geologic units for NSACLASS values of polygons found only outside the Cook Inlet map area are from the state geologic map compilation, and only briefly described. Supplemental attribute tables included with this data set contain additional descriptive information of each geologic unit. A user may use items SOURCE and CLASS to retrieve information about the original units from which these generalized units were formed. NOTE: Because of limitations of common GIS fonts, the letters 'Tr', 'Mz', 'Pa', and 'Pz' are substituted for the standard symbols for 'Triassic', 'Mesozoic', 'Pennsylvannian', and 'Paleozoic'. (Source: this data set)

    ValueDefinition
    98bu - bedrock, unknown
    99bu - bedrock, unknown
    100Qs - Surficial deposits, undivided (Quaternary)
    101ice
    102water
    103Qtf - Modern tidal flat and estuarine deposits (Holocene)
    105Qat - Alluvium along major rivers and in terraces (Holocene)
    106Qaf - Alluvial fan deposits (Holocene)
    107Qlc - Landslide and colluvial deposits (Holocene and Upper Pleistocene)
    108Qlc - Landslide and colluvial deposits (Holocene and Upper Pleistocene)
    109Qgo - Glacial deposits, outwash in plains, valley trains, and fans (Upper Pleistocene)
    110Qat - Alluvium along major rivers and in terraces (Holocene)
    111Qgc - Glacial deposits, glacioalluvium (Upper Pleistocene)
    112Qsl - Lacustrine, swamp, and fine silt deposits (Quaternary)
    113Qsl - Lacustrine, swamp, and fine silt deposits (Quaternary)
    114Qat - Alluvium along major rivers and in terraces (Holocene)
    115Qb - Beach deposits (Quaternary)
    116Qes - Estuarine deposits (Holocene)
    117Qes - Estuarine deposits (Holocene)
    119Qd - Eolian deposits (Quaternary)
    120Qd - Eolian deposits (Quaternary)
    122Qsl - Lacustrine, swamp, and fine silt deposits (Quaternary)
    123Qgl - Glacial deposits; graciolacustrine deposits (Holocene and Upper Pleistocene)
    124Qgl - Glacial deposits; glaciolacustrine deposits (Holocene and Upper Pleistocene)
    125Qm - Glacial deposits, undivided (Quaternary)
    126Qm - Glacial deposits, undivided (Quaternary)
    127Qm - Glacial deposits, undivided (Quaternary)
    128Qlc - Landslide and colluvial deposits (Holocene and Upper Pleistocene)
    129ice contact deposits
    130Qhg - Glacial deposits; young moraine deposits (Holocene)
    131Qho - Glacial deposits; younger outwash deposits (Holocene)
    135Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    136Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    137Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    138Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    139Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    140Qgo - Glacial deposits; outwash in plains, valley trains, and fans (Upper Pleistocene)
    141Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    145glacial deposits of the Brooks Lake glaciation, drumlin
    146Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    147Qg - Glacial deposits; major moraine and kame deposits (Upper Pleistocene)
    148Qs - Surficial deposits, undivided (Quaternary)
    150Qge - Glacial deposits; glacioestuarine deposits (Upper Pleistocene)
    151Qbc - Glacial deposits; Bootlegger Cove Formation (Upper Pleistocene)
    170Qdl - Deltaic deposits (Quaternary)
    190Qog - Older glacial deposits (Middle or Lower Pleistocene)
    191glacial deposits of the Mak Hill glaciation, drumlin
    194Qog - Older glacial deposits (Middle or Lower Pleistocene)
    195Qog - Older glacial deposits (Middle or Lower Pleistocene)
    200Qog - Older glacial deposits (Middle or Lower Pleistocene)
    201Qog - Older glacial deposits (Middle or Lower Pleistocene)
    210glacial deposits of unnamed older glaciation, outwash
    215Qs - Surficial deposits, undivided (Quaternary)
    275Qm - Glacial deposits, undivided (Quaternary)
    295Qs - Surficial deposits, undivided (Quaternary)
    300Qv - Volcanic rocks, undivided (Quaternary)
    305Qhv - Volcanic rocks (Holocene)
    306volcanic domes (Holocene and Pleistocene)
    310Qv - Volcanic rocks, undivided (Quaternary)
    311Qv - Volcanic rocks, undivided (Quaternary)
    312Qdf - Volcanic; debris-flow deposits (Holocene)
    313Qdf - Volcanic; debris-flow deposits (Holocene)
    314Qdf - Volcanic; debris-flow deposits (Holocene)
    401Qvd - Dacitic to rhyolitic domes (Holocene)
    402Qad - Andesite and dacite domes (Pleistocene)
    450QTv - Old volcanic rocks, undivided (Pleistocene or Pliocene)
    460QTv - Old volcanic rocks, undivided (Pleistocene or Pliocene)
    500Tsu - Sedimentary rocks, undivided (Tertiary)
    540Tks - Sterling Formation (Pliocene and Miocene)
    545Tkb - Beluga Formation (Miocene)
    560Tkn - Kenai Group, undivided (Pliocene to Oligocene)
    600Tkt - Tyonek Formation (Miocene and Oligocene)
    630Tkh - Hemlock Conglomerate, undivided (Oligocene)
    640coal-bearing rocks
    650Tkh - Hemlock Conglomerate, undivided (Oligocene)
    670Tts - Tsadaka Formation (Miocene or Oligocene)
    790Tsadaka and Wishbone Formations, undivided
    795Tvs - Volcaniclastic sedimentary rocks (Eocene or younger)
    850Tcl - Copper Lake Formation, undivided (lower Eocene and Paleocene?)
    855Twf - West Foreland Formation (Eocene and Paleocene)
    870Tw - Wishbone Formation (Eocene)
    890Tar - Arkose Ridge Formation (lower Eocene and upper Paleocene)
    900Tch - Chickaloon Formation (lower Eocene and upper Paleocene)
    950Orca Group, sedimentary rocks, undivided
    951Orca Group, sedimentary and volcanic rocks, undivided
    952Conglomerate of the Orca Group
    1000Tvu - Tertiary volcanic rocks, undivided (Tertiary)
    1003mafic to intermediate flows
    1011TKd - Dikes and sills (Tertiary to Cretaceous)
    1012TKd - Dikes and sills (Tertiary to Cretaceous)
    1025Tb - Basaltic volcanic rocks (Pliocene)
    1030Gibralter Lake Tuff
    1031Tpg - Gibralter Lake Tuff (Pliocene? to Oligocene?)
    1051volcanic rocks of Barrier Range (late Tertiary)
    1070Tmf - Tuffaceous felsic volcanic rocks (Eocene?)
    1081Tmv - Paleogene volcanic rocks, undivided (Oligocene and Eocene)
    1082Tmb - Basalt and andesite (Oligocene and Eocene)
    1083volcanic rocks north of Naknek Lake, andesite and dacitic flows and breccias
    1087Tmb - Basalt and andesite (Oligocene and Eocene)
    1103Tem - Mafic volcanic rocks (Eocene)
    1121Tfv - Felsic volcanic and sub-volcanic rocks (Eocene)
    1135Orca Group, volcanic rocks, undivided
    1136pillow basalt
    1137sheeted dikes
    1170Tpv - Intermediate to mafic volcanic rocks (Paleocene)
    1200Ti - Intrusive rocks, undivided (Tertiary)
    1203intrusive rocks (Tertiary)
    1205Ti - Intrusive rocks, undivided (Tertiary)
    1250Tpi - Intermediate intrusive rocks (Pliocene and latest Miocene)
    1270granitic rocks (Tertiary)
    1273Toegr - Granitic rocks (Oligocene and late Eocene)
    1275Toegr - Granitic rocks (Oligocene and late Eocene)
    1290Toegr - Granitic rocks (Oligocene and late Eocene)
    1292Foraker pluton (Eocene)
    1293Miners Bay pluton
    1294gabbro or gabbro diorite
    1300Toegr - Granitic rocks (Oligocene and late Eocene)
    1301TKd - Dikes and sills (Tertiary to Cretaceous)
    1320Tpgr - Granitic rocks of Paleocene age (Paleocene)
    1325Ti - Intrusive rocks, undivided (Tertiary)
    1330Thg - Hypabyssal granitic rocks (Paleocene?)
    1340Tpgr - Granitic rocks of Paleocene age (Paleocene)
    1350Tgd - Biotite-hornblende-granodiorite (Paleocene)
    1360Tpd - Biotite diorite (Paleocene)
    1374gabbro and diorite
    1375ultramafic rocks
    1380Tgn - Gabbronorite (Oligocene? or Eocene?)
    1600TKv - Older volcanic rocks, undivided (Paleocene to Upper Cretaceous)
    1602Tkd - Dikes and sills (Tertiary to Cretaceous)
    1603volcanic rock, light gray to pink rhyolite
    1604volcanic rocks, dacite
    1615TKft - Felsic tuff (early Tertiary or Cretaceous)
    1635basalt flows
    1650TKg - Granitic rocks, undivided (Paleocene to Late Cretaceous)
    1655TKg - Granitic rocks, undivided (Paleocene to Late Cretaceous)
    1656TKg - Granitic rocks, undivided (Paleocene to Late Cretaceous)
    1658TKg - Granitic rocks, undivided (Paleocene to Late Cretaceous)
    1660TKgd - Granodioritic rocks (Paleocene to Late Cretaceous)
    1665TKgd - Granodioritic rocks (Paleocene to Late Cretaceous)
    1670TKgb - Gabbroic rocks (Tertiary and (or) Cretaceous)
    1710TKc - Cataclastite (Eocene? and Cretaceous, metamorphic age)
    1720TKgg - Gneiss (Tertiary or Cretaceous, metamorphic age)
    1780volcanic and sedimentary rocks, undivided (Late Cretaceous and Tertiary)
    1806sandstone (Cretaceous)
    1824Kyh - Graywacke of the Yenlo Hills (Cretaceous?)
    1917Kkd - Kodiak Formation (Upper Cretaceous)
    1920continental sedimentary rocks (Tertiary, Paleocene)
    1955Kkg - Kaguyak Formation (Upper Cretaceous, Maastrichtian and Campanian)
    1961Ksm - Saddle Mountain section of Magoon and others (1980) (Upper Cretaceous, Maastrichtian)
    1970Kuskokwim Group, sandstone, siltstone, shale, and conglomerate
    2010Km - Matanuska Formation (Upper Cretaceous to upper Lower Cretaceous, Maastrichtian to Albian)
    2100sedimentary rocks, undivided (Early Cretaceous)
    2120Pedmar Formation (Early Cretaceous, Albian)
    2130Kcc - Cape Current terrane of Connelly (1978) (Upper Cretaceous)
    2150Khe - Herendeen Formation (Lower Cretaceous, Barremian and Hauterivian)
    2175Staniukovich Formation (Early Cretaceous)
    2190KMm - McHugh and Uyak Complexes, undivided (Cretaceous to Mississippian)
    2192graywacke, argillite, and shale (Silurian? to Middle Devonian)
    2197Uyak Complex, gabbroic and ultramafic rocks (Cretaceous)
    2198KJms - McHugh Complex, graywacke and conglomerate (Early Cretaceous to Early Jurassic, Pliensbachian)
    2199KTrmc - McHugh Complex, basalt and chert (Early Cretaceous to Middle Triassic, Albian to Ladinian)
    2225Kv - Intermediate and felsic volcanic rocks (Cretaceous)
    2420Kgd - Granodiorite (Late Cretaceous)
    2430Kqd - Quartz diorite (Late Cretaceous)
    2440TKgb - Gabbroic rocks (Tertiary and (or) Cretaceous)
    2460Kgr - Granite (Cretaceous)
    2470Kqms - Quartz monzonite, monzonite, and syenite (Late Cretaceous)
    2480Kgd - Granodiorite (Late Cretaceous)
    2490Kogr - Older granite (Cretaceous, Cenomanian)
    2491Kogr - Older granite (Cretaceous, Cenomanian)
    2510Kum - Ultramafic rocks (Late Cretaceous)
    2540diorite, quartz diorite, and syenodirite (Cretaceous)
    2570Klt - Leucotonalite and trondhjemite (Early Cretaceous, Albian to Barremian)
    2680Kivs - Metamorphosed intermediate volcanic and sedimentary rocks (Cretaceous)
    2700Kvs - Valdez Group, metasedimentary rocks, undivided (Upper Cretaceous)
    2702Valdez Group, interbedded volcanic and sedimentary rocks (Late Cretaceous)
    2706Kvv - Valdez Group, mafic metatuff (Upper Cretaceous)
    2708Kvm - Valdez Group, melange of Iceworm Peak of Kusky and others (1997) (Upper Cretaceous)
    2710Kvgs - Valdez Group, schist (Upper Cretaceous)
    2750Kps - Pelitic schist (Cretaceous?)
    2850KJs - Turbiditic sedimentary rocks of the Kahiltna flysch sequence (Cretaceous, Aptian and Valanginian or younger to Upper Jurassic?)
    2852flysch sequence, Late Cretaceous to Late Jurassic
    2853Ksf - Turbiditic sedimentary rocks of the Kahiltna flysch sequence; feldspathic sedimentary rocks (Cretaceous)
    2854Kes - Turbiditic sedimentary rocks of the Kahiltna flysch sequence; turbiditic sedimentary and volcanic rocks (Cretaceous, Aptian or younger)
    2855Koksetna River sequence, Jura-Cretaceous flysch, southern part of Kahiltna terrane
    2890pillow basalt (Early Cretaceous and Jurassic?)
    2900KJq - Quartz monzodiorite (Cretaceous? and (or) Jurassic?)
    3010Jn - Naknek Formation, undivided (Upper Jurassic, Tithonian to Oxfordian)
    3011Jnp - Naknek Formation, Pomeroy Arkose Member (Upper Jurassic, Kimmeridgian and Oxfordian?)
    3012Jnn - Naknek Formation, Northeast Creek Sandstone Member (Upper Jurassic, Oxfordian)
    3013Jnst - Naknek Formation, Snug Harbor Siltstone Member (Upper Jurassic, Kimmeridgian and Oxfordian)
    3014Jni - Naknek Formation, Indecision Creek Sandstone Member (Upper Jurassic, Tithonian and Kimmeridgian)
    3015Jnk - Naknek Formation, Katolinat Conglomerate Member (Upper Jurassic, Tithonian)
    3016Jnc - Naknek Formation, Chisik Conglomerate Member (Upper Jurassic, Tithonian to Oxfordian)
    3020Jcp - Chinitna Formation, Paveloff Siltstone Member (Middle Jurassic, Callovian)
    3025Jc - Chinitna Formation, undivided (Middle Jurassic, Callovian)
    3030Jct - Chinitna Formation, Tonnie Siltstone Member (Middle Jurassic, Callovian)
    3140Chinitna Formation and Tuxedni Group, undivided (Late Jurassic)
    3180Jt - Tuxedni Group, undivided (Middle Jurassic, lower Bathonian to Aalenian)
    3181Jtb - Tuxedni Group, Bowser Formation (Middle Jurassic, lower Bathonian and upper Bajocian)
    3182Jtt - Tuxedni Group, Twist Creek Siltstone (Middle Jurassic, Bajocian)
    3183Jtc - Tuxedni Group, Cynthia Falls Sandstone (Middle Jurassice, Bajocian)
    3184Jtf - Tuxedni Group, Fitz Creek Siltstone (Middle Jurassic, middle Bajocian)
    3185Jtg - Tuxedni Group, Gaikema Sandstone (Middle Jurassic, lower middle Bajocian)
    3186Jtrg - Tuxedni Group, Red Glacier Formation (Middle Jurassic, lower Bajocian to Aalenian)
    3210undivided marine sedimentary rocks (Cretaceous and Early Jurassic)
    3250Jtk - Talkeetna Formation, undivided (Lower Jurassic)
    3251Jtkh - Talkeetna Formation, Horn Mountain Tuff Member (Lower Jurassic)
    3252Jtkp - Talkeetna Formation, Portage Creek Agglomerate Member (Lower Jurassic)
    3253Jtkm - Talkeetna Formation, Marsh Creek Breccia Member (Lower Jurassic)
    3265Jp - Pogibshi formation of Kelley (1980), undivided (Lower Jurassic, Sinemurian to Hettangian and older?)
    3380Jtr - Alaska-Aleutian Range batholith (Jurassic phase), trondhjemite (Late Jurassic)
    3401granite (Jurassic)
    3402Jqm - Alaska-Aleutian Range batholith (Jurassic phase), granodiorite and quartz monzonite (Middle and late Early Jurassic)
    3403Jqd - Alaska-Aleutian Range batholith (Jurassic phase), quartz diorite, tonalite, and diorite (Jurassic)
    3404Jqd - Alaska-Aleuatian Range batholith (Jurassic phase), quartz diorite, tonalite, and diorite (Jurassic)
    3405Jqd - Alaska-Aleutian Range batholith (Jurassic phase), quartz diorite, tonalite, and diorite (Jurassic)
    3407Jmu - Alaska-Aleutian Range batholith (Jurassci phase), mafic and ultramafic plutonic rocks (Middle and late Early Jurassic)
    3420Jqd - Alaska-Aleutian Range batholith (Jurassic phase), quartz diorite, tonalite, and diorite (Jurassic)
    3490Jum - Mafic and ultramafic rocks, (Middle Jurassic or older?)
    3525Jeqd - Quartz diorite and tonalite (Middle and Early Jurassic)
    3530Jum - Mafic and ultramafic rocks, undivided (Middle Jurassic or older?)
    3600Jpmu - Plutonic and metamorphic rocks, undifferentiated (Middle to Early Jurassic, metamorphic age)
    3610Jsch - Greenschist and blueschist (Jurassic, metamorphic age)
    3621migmatite border zone of granodiorite (Jurassic)
    3850crystal tuff, argillite, chert, graywacke, and limestone, deep marine (Late Jurassic to Late Triassic?)
    4000TrPavs - Basaltic to andesitic metavolcanic and sedimentary rocks (Triassic?, Permian, Cisuralain, and Pennsylvanian?)
    4019Trpg - Port Graham formation of Kelley (1980) (Upper Triassic, Norian)
    4020Kamishak Formation (includes some volcanic rocks) (late Triassic)
    4021Limestone and basalt sequence (Late Triassic)
    4022Trku - Kamishak Formtaion, Ursus Member (Upper Triassic, Norian)
    4023Trkm - Kamishak Formation, Middle Member (Upper Triassic, Norian)
    4024Trkb - Kamishak Formation, Bruin Limestone Member (Upper Triassic, Norian)
    4030JTrlm - Talkeetna Formation, limestone and marble (Lower Jurassic or Upper Triassic?)
    4031JTrlm - Talkeetna Formation, limestone and marble (Lower Jurassic or Upper Triassic?)
    4033shale and limestone (Early Paleozoic?)
    4050conglomerate and volcanic sandstone (Late Triassic, Norian)
    4150Trss - Shuyak Formation, sedimentary member (Upper Triassic)
    4235Chulitna sequence, volcanic and sedimentary rocks (Late Triassic)
    4240Trvm - Mafic dikes, sill, and plugs (Triassic?)
    4250Trsv - Shuyak Formation, volcanic member (Upper Triassic)
    4310Trqd - Quartz diorite to diorite (Late Triassic)
    4320gabbro, diabase, and metagabbro (Late Triassic?)
    4420Trn - Nikolai Greenstone and related rocks (Upper and (or) Middle Triassic)
    4422Nikolai Greenstone, pillow basalt member (Late and (or) Middle Triassic)
    4425Trc - Cottonwood Bay Greenstone (Upper Triassic, Carnian or older)
    4430basaltic metavolcanic rocks (Late Triassic)
    4450metabasalt and slate (Late Triassic)
    4880Mzg - McHugh and Uyak Complexes, gabbro (Mesozoic)
    4890Mzu - McHugh and Uyak Complexes, ultramafic plutonic rocks (Mesozoic)
    5030TrPavs - Basaltic to andesitic metavolcanic and sedimentary rocks (Triassic?, Permian, Cisuralian, and Pennsylvanian?)
    5160undivided intrusive rocks (Mesozoic or Paleozoic)
    5180gabbro and quartz diorite (Mesozoic and (or) Paleozoic)
    5190undivided dunite and serpentinite (Mesozoic or Paleozoic)
    5200metamorphic rocks, undivided (Mesozoic and Paleozoic)
    5210argillite and lithic graywacke (Early Cretaceous)
    5220JPk - Kakhonak Complex (Jurassic, Triassic, and Permian? or older?)
    5240MzPzm - Metamorphosed mafic volcanic and sedimentary rocks (Mesozoic and Paleozoic)
    5245diorite, gabbro, picrite, and pyroxenite sill and dike swarm complex (Mesozoic)
    5290serpentinite (Mesozoic and (or) Paleozoic)
    5310Dillinger stratigraphic sequence, undivided (Paleozoic)
    5370Mystic and Dillinger stratigraphic sequences, undivided (Triassic to Ordovician)
    5410volcanic and sedimentary rocks (middle or late Paleozoic)
    5450pillow basalt (middle or late Paleozoic)
    5550JPam - Amphibolite (Lower Jurassic or older)
    5625metamorphosed Skolai Group
    5630Slana Spur Formation, volcaniclastic rocks (Early to Middle Permian)
    5641greenstone (Middle to Early Jurassic metamorphic age)
    5920Strelna Metamorphic complex, low- to medium-grade greenschist and amphibolite (Late Jurassic or older)
    5950Eagle Creek Formation, marine argillite and limestone, lower greenschist facies (Early Permian)
    5955JPmb - Marble (Jurassic, metamorphic age; Permian? protolith age)
    6010Sheep Creek Formation and correlative siliciclastic units of the Mystic stratigraphic sequence (Permian to Devonian)
    6120Station Creek Formation andesitic volcanic rocks (Early Permian? and Pennsylvanian)
    6615thin-bedded limestone
    7580Post River Sandstone and Lyman Hills Formations and correlative units, silty limestone and siltstone (Early Ordovician)
    9322pelitic and quartzose schist of the Alaska Range

    LABEL
    LABEL is a character field (6 8 C) which holds the label of the geologic unit. When NSAMOD has the value 'Q', the unit is queried and the symbol '?' is appended to the value in LABEL. (Source: this data set)

    ValueDefinition
    JPamAmphibolite (Lower Jurassic or older)
    JPkKakhonak Complex (Jurassic, Triassic, and Permian? or older?)
    JPmbMarble (Jurassic, metamorphic age; Permian? protolith age)
    JTrlmLimestone and marble (Lower Jurassic or Upper Triassic?)
    JcChinitna Formation, undivided (Middle Jurassic, Callovian)
    JcpChinitna Formation, Paveloff Siltstone Member (Middle Jurassic, Callovian)
    JctChinitna Formation, Tonnie Siltstone Member (Middle Jurassic, Callovian)
    JeqdPlutons proximal to the Border Ranges fault zone, quartz diorite and tonalite (Middle and Early Jurassic)
    JmuAlaska-Aleutian Range batholith, mafic and ultramafic plutonic rocks (Middle and late Early Jurassic)
    JnNaknek Formation, undivided (Upper Triassic, Tithonian to Oxfordian)
    JncNaknek Formation, Chisik Conglomerate Member (Upper Triassic, Tithonian to Oxfordian)
    JniNaknek Formation, Indecision Creek Sandstone Member (Upper Jurassic, Tithonian and Kimmeridgian)
    JnkNaknek Formation, Katolinat Conglomerate Member (Upper Jurassic, Tithonian)
    JnnNaknek Formation, Northeast Creek Sandstone (Upper Jurassic, Oxfordian)
    JnpNaknek Formation, Pomeroy Arkose Member (Upper Jurassic, Kimmeridgian and Oxfordian?)
    JnstNaknek Formation, Snag Harbor Siltstone Member (Upper Jurassic, Kimmeridgian and Oxfordian)
    JpPogibshi formation of Kelley (1980), undivided (Lower Jurassic, Sinemurian to Hettangian and older?)
    JpmuPlutonic and metamorphic rocks, undifferentiated (Middle to Early Jurassic, metamorphic age)
    JqdQuartz diorite, tonalite, and diorite (Jurassic)
    JqmGranodiorite and quartz monzonite (Middle and late Early Jurassic)
    JschGreenschist and blueschist (Jurassic, metamorphic age)
    JtTuxedni Group, undivided (Middle Jurassic, lower Bathonian to Aalenian)
    JtbTuxedni Group, Bowser Formation (Middle Jurassic, lower Bathonian and upper Bajocian)
    JtcTuxedni Group, Cynthia Falls Sandstone (Middle Jurassic, Bajocian)
    JtfTuxedni Group, Fitz Creek Siltstone (Middle Jurassic, middle Bajocian)
    JtgTuxedni Group, Gaikema Sandstone (middle Jurassic, lower middle Bajocian)
    JtkTalkeetna Formation, undivided (Lower Jurassic)
    JtkhTalkeetna Formation, Horn Mountain Tuff Member (Lower Jurassic)
    JtkmTalkeetna Formation, Marsh Creek Breccia Member (Lower Jurassic)
    JtkpTalkeetna Formation, Portage Creek Agglomerate Member (Lower Jurassic)
    JtrAlaska-Aleutian Range batholith, Trondhjemite (Late Jurassic)
    JtrgTuxedni Group, Red Glacier Formation (Middle Jurassic, lower Bajocian to Aalenian)
    JttTuxedni Group, Twist Creek Siltstone (Middle Jurassic, Bajocian)
    JumPlutons proximal to the Border Ranges fault zone, mafic and ultramafic rocks, undivided (Middle Jurassic or older?
    KJmsHcHugh Complex, graywacke and conglomerate (Early Cretaceous to Early Jurassic, Pliensbachian)
    KJqQuartz monzodiorite (Cretaceous? and (or) Jurassic?)
    KJsTurbiditic sedimentary rocks of the Kahiltna flysch sequence (Cretaceous, Aptian and Valanginian or younger to Upper Jurassic?)
    KMmMcHugh and Uyak Complexed, undivided (Cretaceous to Mississippian)
    KTrmcMcHugh Complex, basalt and chert (Early Cretaceous to Middle Triassic, Albian to Ladinian)
    KccCape Current terrace of Connelly (1978) (Upper Cretaceous)
    KesTurbiditic sedimentary and volcanic rocks (Cretaceous, Aptian or younger)
    KgdGranodiorite (Late Cretaceous)
    KgrGranite (Cretaceous)
    KheHerendeen Formation (Lower Cretaceous, Barremian and Hauterivian)
    KivsMetamorphosed intermediate volcanic and sedimentary rocks (Cretaceous)
    KkdKodiak Formation (Upper Cretaceous)
    KkgKaguyak Formation (Upper Cretaceous, Maastrichtian and Campanian)
    KltLeucotonalite and trondhjemite (Early Cretaceous, Albian to Barremian)
    KmMatanuska Formation (Upper Cretaceous to upper Lower Cretaceous, Maastrichtian to Albian)
    KogrOlder granite (Cretaceous, Cenomanian)
    KpsPelitic schist (Cretaceous?)
    KqdQuartz diorite (Late Cretaceous)
    KqmsQuartz monzonite, monzonite, and syenite (Late Cretaceous)
    KsfFeldspathic sedimentary rocks (Cretaceous)
    KsmSaddle Mountain section of Magoon and others (1980) (Upper Cretaceous, Maastrichtian)
    KumUltramafic rocks (Late Cretaceous)
    KvIntermediate and felsic volcanic rocks (Cretaceous)
    KvgsValdez Group, schist (Upper Cretaceous)
    KvmValdez Group, melange of Iceworm Peak of Kusky and others (1997) (Upper Cretaceous)
    KvsValdez Group, metasedimentary rocks, undivided (Upper Cretaceous)
    KvvValdez Group, mafic metatuff (Upper Cretaceous)
    KyhGraywacke of the Yenlo Hills (Cretaeous?)
    MzPzmMetamorphosed mafic volcanic and sedimentary rocks (Mesozoic and Paleozoic)
    MzgMcHugh and Uyak Complexes, gabbro (Mesozoic)
    MzuMcHugh and Uyak Complexes, ultramafic plutonic rocks (Mesozoic)
    QTvOld volcanic rocks, undivided (Pleistocene or Pliocene)
    QadAndesite and dacite domes (Pleistocene)
    QafAlluvial fan deposits (Holocene)
    QatAlluvium along major rivers and in terraces (Holocene)
    QbBeach deposits (Quaternary)
    QbcBootlegger Cove Formation (Upper Pleistocene)
    QdEolian deposits (Quaternary)
    QdfDebris-flow deposits (Holocene)
    QdlDeltaic deposits (Quaternary)
    QesEstuarine deposits (Holocene)
    QgMajor moraine and kame deposits (Upper Pleistocene)
    QgcGlacioalluvium (Upper Pleistocene)
    QgeGlacioestuarine deposits (Upper Pleistocene)
    QglGlaciolacustrine deposits (Holocene and Upper Pleistocene)
    QgoOutwash in plains, valley trains, and fans (Upper Pleistocene)
    QhgYoung moraine deposits (Holocene)
    QhoYounger outwash deposits (Holocene)
    QhvVolcanic rocks (Holocene)
    QlcLandslide and colluvial deposits (Holocene and Upper Pleistocene)
    QmGlacial deposits, undivided (Quaternary)
    QogOlder glacial deposits (Middle or Lower Pleistocene)
    QsSurficial deposits, undivided (Quaternary)
    QslLacustrine, swamp, and fine silt deposits (Quaternary)
    QtfModern tidal flat and estuarine depoists (Holocene)
    QvVolcanic rocks, undivided (Quaternary)
    QvdDacitic to rhyolitic domes (Holocene)
    TKcCataclastite (Eocene? and Cretaceous, metamorphic age)
    TKdDikes and sills (Tertiary to Cretaceous)
    TKftFelsic tuff (early Tertiary or Cretaceous)
    TKgGranitic rocks, undivided (Paleocene to Late Cretaceous)
    TKgbGabbroic rocks (Tertiary and (or) Cretaceous)
    TKgdGranodioritic rocks (Paleocene to Late Cretaceous)
    TKggGneiss (Tertiary or Cretaceous, metamorphic age)
    TKvOlder volcanic rocks, undivided (Paleocene to Upper Cretaceous)
    TarArkose Ridge Formation (lower Eocene and upper Paleocene)
    TbBasaltic volcanic rocks (Pliocene)
    TchChickaloon Formation (lower Eocene and upper Paleocene)
    TclCopper Lake Formation, undivided (lower Eocene and Paleocene?)
    TemMafic volcanic rocks (Eocene)
    TfvFelsic volcanic and sub-volcanic rocks (Eocene)
    TgdBiotite-hornblende-granodiorite (Paleocene)
    TgnGabbronorite (Oligocene? or Eocene?)
    ThgHypabyssal granitic rocks (Paleocene?)
    TiIntrusive rocks, undivided (Tertiary)
    TkbKenai Group, Belulga Formation (Miocene)
    TkhKenai Group, Hemlock Conglomerate, undivided (Oligocene)
    TKnKenai Group, undivided (Pliocene to Oligocene)
    TksKenai Group, Sterling Formation (Pliocene and Miocene)
    TktKenai Group, Tyonek Formation (Miocene and Oligocene)
    TmbBasalt and andesite (Oligocene and Eocene)
    TmfTuffaceous felsic volcanic rocks (Eocene?)
    TmvPaleogene volcanic rocks, undivided (Oligocene and Eocene)
    ToegrGranitic rocks (Oligocene and late Eocene)
    TpdBiotite diorite (Paleocene)
    TpgGibraltar Lake Tuff (Pliocene? to Oligocene?)
    TpgrGranitic rocks of Paleocene age (Paleocene)
    TpiIntermediate intrusive rocks (Pliocene and latest Miocene)
    TpvIntermediate to mafic volcanic rocks (Paleocene)
    TrPavsBasaltic to andesitic metavolcanic and sedimentary rocks (Triassic?, Permian, Cisuralian, and Pennsylvanian?)
    TrcCottonwood Bay Greenstone (Upper Triassic, Carnian or older)
    TrkbKamishak Formation, Bruin Limestone Member (Upper Triassic, Norian)
    TrkmKamishak Formation, Middle Member (Upper Triassic, Norian)
    TrkuKamishak Formation, Ursus Member (Upper Triassic, Norian)
    TrnNikolai Greenstone and related rocks (Upper and (or) Middle Triassic)
    TrpgPort Graham formation of Kelley (1980) (Upper Triassic, Norian)
    TrqdQuartz diorite to diorite (Late Triassic)
    TrssShuyak Formation, sedimentary member (Upper Triassic)
    TrsvShuyak Formation, volcanic member (Upper Triassic)
    TrvmMafic dikes, sills, and plugs (Triassic?)
    TsuSedimentary rocks, undivided (Tertiary)
    TtsTsadaka Formation (Miocene or Oligocene)
    TvsVolcaniclastic sedimentary rocks (Eocene or younger)
    TvuTertiary volcanic rocks, undivided (Tertiary)
    TwWishbone Formation (Eocene)
    TwfWest Foreland Formation (Eocene and Paleocene)
    bubedrock, unmapped

    NSAMOD
    NSAMOD is a character (8 10 C) item in the polygon attribute table (Source: this data set)

    ALT - hydrothermally altered, nonspecific ALT-SER - sericitic alteration HFS - contact metamorphism, nonspecific Q - queried unit

    SOURCE
    SOURCE is a character (6 8 C) item found in both the polygon and arc attribute tables. The values are abbreviated codes representing the original source reference for the polygon or arc feature. The format for SOURCE is XX###, where XX is a two letter code for the 1:250,000-scale quadrangle and ### is a three digit number (with leading zeros). All source codes with '001' are unspecified sources for water and ice features, often paper topographic maps, DRG or DLG files. (Source: this data set)

    ValueDefinition
    AF002Riehle, J.R., Detterman, R.L., Yount, M.E., and Miller, J.W., 1993, Geologic map of the Mount Katmai quadrangle and adjacent parts of the Naknek and Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2204, scale 1:250,000.
    AF004Connelly, William, and Moore, J.C., 1979, Geologic map of the northwest side of the Kodiak and adjacent islands, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1057, 2 sheets, scale 1:250,000.
    AF005Wilson, F.H., 2005, Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map of the Kodiak Islands, Alaska: U.S. Geological Survey Open-File Report 2005-1340.
    AF006Riehle, J.R., and Detterman, R.L., 1993, Quaternary geologic map of the Mount Katmai quadrangle and adjacent parts of the Naknek and Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2032, scale 1:250,000.
    AF008Wilson, F.H., Detterman, R.L., and DuBois, G.D., 1999, Geologic framework of the Alaska Peninsula: U.S. Geological Survey Open-File Report 99-317.
    AF010Capps. S.R., 1937, Kodiak and adjacent islands, Alaska: U.S. Geological Survey Bulletin 880-C, p. 111-184.
    AF011Magoon, L.B., Adkison, W.L., and Egbert, R.M., 1976, Map showing geology, wildcat wells, Tertiary plant localities, K-Ar age dates, and petroleum operations, Cook Inlet area, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1019, scale 1:250,000, 3 sheets.
    AF012Wilson edits
    AF013Fisher, M.A, and Magoon, L.B., 1978, Geologic framework of lower Cook Inlet, Alaska: American Association of Petroleum Geologists Bulletin, v. 62, no. 3, p. 373-402.
    AN002Winkler, G.R., compiler, 1992, Geologic map and summary geochronology of the Anchorage 1x3 degree quadrangle, southern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2283, scale 1:250,000.
    AN005Nelson, S.W., Miller, M.L., Haeussler, P.J., Snee, L.W., Phillips, P.J., Huber, Carol, 1999, Preliminary geologic map of the Chugach National Forest Special Study Area, Alaska: U.S. Geological Survey Open-File Report 99-362, scale 1:63,360.
    AN007Hank Schmoll, 2008
    AN008Wilson and Hults edits
    AN010Reger, R.D., 1977, Reconnaissance geology of the Talkeetna-Kashwitna area, Susitna River basin, Alaska: Alaska Division of Geological and Geophyiscal Surveys Alaska Open-File Report AOF-107a, 1 sheet, scale 1:63,360.
    AN012Detterman, R.L., Plafker, George, Hudson, Travis, Tysdal, R.G., and Pavoni, Nazario, 1974, Surface geology and Holocene breaks along the Susitna segment of the Castle Mountain fault, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-618, scale 1:24,000.
    AN013Haeussler, P.J., 1998, Surficial geologic map along the Castle Mountain fault between Houston and Hatcher Pass Road, Alaska: U.S. Geological Survey Open-File Report 98-480, scale 1:25,000.
    AN014Detterman, R.L., Hudson, Travis, Plafker, George, Tysdal, R.G., and Hoare, J.M., 1976, Reconnaissance geologic map along Bruin Bay and Lake Clark faults in Kenai and Tyonek quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-477, 4 p., 1 sheet, scale 1:250,000.
    AN015Albanese, M., Kline, J.T., Bundtzen, T.K., and Kline, K., 1983, Reconnaissance geology and geochemistry of the Willow Creek-Hatcher Pass area, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File PDF 83-9, 1 sheet, scale 1:63,360.
    AN017Reger, R.D., and Updike, R.G., 1983, Upper Cook Inlet region and the Matanuska Valley, in Pewe, T.L., and Reger, R.D., eds., Fourth international conference on permafrost, Fairbanks, Alaska, July 18-22, 1983, Guidebook to permafrost and Quaternary geology along the Richardson and Glenn Highways between Fairbanks and Anchorage, Alaska: Division of Geological and Geophysical Surveys, Department of Natural Resources, Fairbanks, Alaska, p. 185-263, 1 sheet, scale 1:250,000.
    IL002Detterman, R.L., and Reed, B.L., 1980, Stratigraphy, structure, and economic geology of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin 1368-B, 86 p., 1 sheet, scale 1:250,000.
    IL003Detterman. R.L., and Reed, B.L., 1973, Surficial deposits of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin 1368-A, 64 p., 1 plate, scale 1:250,000.
    IL006Wilson, F.H., Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasauskas, E.P., Gamble, B.M., and Coonrad, W.L., 2006, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska; including the Dillingham, Iliamna, Lake Clark, Taylor Mountains and the western part of the Kenai and Seldovia 1:250,000-scale quadrangles: U.S. Geological Survey Open-file Report 2006-1303.
    IL007Detterman, R.L., and Hartsock, J.K., 1966, Geology of the Iniskin-Tuxedni region, Alaska: U.S. Geological Survey Professional Paper 512, 78 pl. 6 plates, scale 1:63,360.
    IL008Waythomas, C.F., and Miller, T.P., 1999, Preliminary volcano-hazard assessment for Iliamna volcano: U.S. Geological Survey Open-File Report 99-373, 31 p., 1 plate, scale unknown.
    IL009Bouley, B.A., St. George, Phil, and Wetherbee, P.K., 1995, Geology and discovery at Pebble Copper, a copper-gold porphyry system in southwest Alaska, in Porphyry deposits of the northwest Cordillera of North America: Canadian Institute of Mining, Metallurgy, and Petroleum Special Volume 46, p. 422-435.
    IL011Wilson edits for Cook Inlet map
    IL013Wilson, F.H., 2008, Surficial geology for Lake Clark National Park region
    IL014Fisher, M.A., and Magoon, L.B., 1978, Geologic framework of lower Cook Inlet, Alaska: American Association of Petroleum Geologists Bulletin, v. 62, no. 3, p. 373, 402.
    KN002Magoon, L.B., Adkison, W.L., and Egbert, R.M., 1976, Map showing geology, wildcat wells, Tertiary plant localities, K-Ar age dates, and petroleum operations, Cook Inlet area, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1019, 3 sheets, scale 1:250,000.
    KN003Bradley, D.C., and Wilson, F.H., 2000, Reconnaissance bedrock geology of the southeastern part of the Kenai quadrangle, Alaska, in Kelley, K.D., and Gough, L.P., eds., Geologic Studies in Alaska: U.S. Geological Survey Professional Paper 1615, pl. 59-64.
    KN005Detterman, R.L., and Hartsock, J.K., 1966, Geology of the Iniskin-Tuxedni region, Alaska: U.S. Geological Survey Professional Paper 512, 78 p., 6 plates, scale 1:63,360.
    KN006Riehle, J.R., and Emmel, K.S., 1980, Photointerpretation map of the surficial geology, Polly Creek to MacArthur River, Cook Inlet, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 64, 2 sheets, scale 1:63,360.
    KN008Wilson, F.H., Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasauskas, E.P., Gamble, B.M., and Coonrad, W.L., 2006, Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissnace geologic map for the northern Alaska Peninsula area, southwest Alaska: U.S. Geological Survey Open-File Report 2006-1303.
    KN009Reed, B.L., Lanphere, M.A., and Miller, T.P., 1992, Double Glacier volcano, a 'new' Quaternary volcano in the eastern Aleutian volcanic arc: Bulletin of Volcanology, v. 54, p. 631-637.
    KNO11Waythomas, C.F., and Miller, T.P., 1999, Preliminary volcano-hazard assessment for Iliamna volcano: U.S. Geological Survey Open-File Report 99-373, 31 p., 1 plate.
    KN012Reed, B.L., Miesch, A.T., and Lanphere, M.A., 1983, Plutonic rocks of Jurassic age in the Alaska-Aleutian Range batholith: Chemical variations and polarity: Geological Society of America Bulletin, v. 94, p. 1232-1240.
    KN013Karlstrom, T.N.V., 1964, Quaternary geology of the Kenai Lowland and glacial history of the Cook Inlet region, Alaska: U.S. Geological Survey Professional Paper 443, 69 p., 7 plates, various scales.
    KN015Wilson and Hults edits
    LC002Nelson, W.H., Carlson, Christine, and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114A, scale 1:250,000.
    LC003Wallace, W.K., Hanks, C.L., and Rogers, J.F., 1989, The southern Kahiltna terrane: implications for the tectonic evolution of southwestern Alaska: Geological Society of Americal Bulletin, v. 101, p. 1389-1407.
    LC005Wilson, F.H., Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasuskas, E.P., Gamble, B.M., Coonrad, W.L., 2006, Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map for the northern Alaska Peninsula area, southwestern Alaska: U.S. Geological Survey Open-File Report 2006-1303.
    LC006Wallace, W.K., 2002, unpublished geologic mapping dated 1985.
    LC007Detterman, R.L., and Hartsock, J.K., 1966, Geology of the Iniskin-Tuxedni region, Alaska: U.S. Geological Survey Professional Paper 512, 78 p., 6 plates, scale 1:63,360.
    LC010Waythomas, C.F., and Miller, T.P., 1999, Preliminary volcano-hazard assessment for Iliamna volcano: U.S. Geological Survey Open-File Report 99-373, 31 p., 1 plate.
    LC011Reed, B.L., Miesch, A.T., and Lanphere, M.A., 1983, Plutonic rocks of Jurassic age in the Alaska-Aleutian Range batholith: Chemical variations and polarity: Geological Society of Americal Bulletin, v 94, p. 1232-1240.
    LC012Eakins, G.R., Gilbert, W.G, and Bundtzen, T.K., 1978, Preliminary bedrock geology and mineral resource potential of west-central Lake Clark quadrangle of Alaska: Alaska Division of Geological and Geophysical Surveys Alaska Open-File Report AOF 118, 15 p., 2 plates, scale 1:125,000.
    MK003Riehle, J.R., and Detterman, R.L., 1998, Quaternary geologic map of the Mount Katmai quadrangle and adjacent parts of the Naknek and Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2032, scale 1:250,000.
    MK004Riehle, J.R., Detterman, R.L., Yount, M.E., and Miller, J.W., 1993, Geologic map of the Mount Katmai quadrangle and adjacent parts of the Naknek and Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2204, scale 1:250,000.
    MK005Wilson, F.H., Detterman, R.L., and DuBois, G.D. 1999, Geologic framework of the Alaska Peninsula: U.S. Geological Survey Open-File Report 99-317.
    MK008Wilson edits
    MK009Detterman field sheet compilations
    SR002Nelson, S.W., Dumoulin, J.A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645B, scale 1:250,000.
    SR004Tysdal, R.G., and Case, J.E., 1979, Geologic map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1150, scale 1:250,000.
    SR005Nelson, S.W., Miller, M.L., Haeussler, P.J., Snee, L.W., Phillips, P.J., Huber, Carol, 1999, Preliminary geologic map of the Chugach National Forest Special Study Area, Alaska: U.S. Geological Survey Open-File Report 99-362, scale 1:63,360.
    SR006Wilson, F.H., Hults, C.P., Labay, K.A., and Shew, Nora, 2008, Preliminary integrated geologic map databases for the United States: Digital data from the reconnaissance geologic map for Prince William Sound and the Kenai Peninsula, Alaska: U.S. Geological Survey Open-File Report OFR 2008-1002.
    SR007Bradley, D.C., and Miller, M.L., 2006, Field guide to south-central Alaska's accretionary complex Anchorage to Seward: Anchorage, Alaska Geological Society, 32 p.
    SR008Bol, A.J., and Gibbons, Helen, 1992, Tectonic implications of out-of-sequence faults in an accretionary prism, Prince Willam Sound, Alaska: Tectonics, v. 11, n. 6, p. 1288-1300.
    SV002Bradley, D.C., Kusky, T.M., Haeussler, P.J., Karl, S.M., and Donley, D.T., 1999, Geology of the Seldovia quadrangle: U.S. Geological Survey Open-File Report 99-18, scale 1:250,000.
    SV004Detterman, R.L., and Hartsock, J.K., 1966, Geology of the Iniskin-Tuxedni region, Alaska: U.S. Geological Survey Professional Paper 512, 78 p., 6 plates, scale 1:63,360.
    SV007Karlstrom, T.N.V., 1964, Quaternary geology of the Kenai Lowland and glacial history of the Cook Inlet region, Alaska: U.S. Geological Survey Professional Paper 443, 69 p., 7 plates, various scales.
    SV008Bradley, D.C., oral communication, June 7, 2007.
    SV009Wilson, F.H., Hults, C.P., Labay, K.A., and Shew, Nora, 2008, Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map for Prince William Sound and the Kenai Peninsula, Alaska: U.S. Geological Survey Open-File Report 2008-1002.
    SV010Magoon. L.B., Adkison, W.L., and Egbert, R.M., 1976, Map showing geology, wildcat wells, Tertiary plant localities, K-Ar age dates, and petroleum operations, Cook Inlet area, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1019, scale 1:250,000, 3 sheets.
    SV011Fisher, M.A., and Magoon, L.B., 1978, Geologic framework of lower Cook Inlet, Alaska: American Association of Petroleum Geologists Bulletin, v. 62, no. 3, p. 373-402.
    TK002Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L., 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest corner Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558A, scale 1:250,000, 60 p.
    TK003Kline, J.T., Bundtzen, T.K., and Smith, T.E., 1990, Preliminary bedrock geologic map of the Talkeetna Mountains D-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File 90-24, scale 1:63,360.
    TK005Schmidt, J.M., 2007, Revisions to Talkeetna Mountains map, written communication, 2007 and 2008.
    TK007Wilson edits, 2008
    TK008Reger, R.D., 1977, Reconnaissance geology of the Talkeetna-Kashwitna area, Susitna River basin, Alaska: Alaska Division of Geological and Geophysical Surveys Alaska Open-File Report AOF-107a, 1 sheet, scale 1:63,360.
    TL002Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1174, 15 p., 1 plate, scale 1:250,000.
    TL003Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of the Central (Interior) Alaska: U.S. Geological Survey Open-File Report OFR 98-133, 76 p., 3 sheets, scale 1:500,000
    TL004Wilson edits
    TL005Reger, R.D., 1977, Reconnaissance geology of the Talkeetna-Kashwitna area, Susitna River basin, Alaska: Alaska Division of Geological and Geophysical Surveys Alaska Open-File Report AOF-107a, 1 sheet, scale 1:63,360.
    TL007Weber, F.R., 1961, Reconnaissance engineering geology for the selection of highway route from Talkeetna to McGrath, Alaska: U.S. Geological Survey Open-File Report OFR 61-169, 2 sheets, scale 1:250,000.
    TY003Reed, B.L., and Elliott, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-File Report OFR 70-271, 24 p., scale 1:250,000.
    TY004Solie, D.N., Gilbert, W.G., Harris, E.E., Kline, J.T., Liss, S.A., and Robinson, M.S., 1991, Preliminary geologic map of Tyonek D-6 and eastern Tyonek D-7 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public-Data File PDF 91-10, 15 p., scale 1:63,360.
    TY005Haeussler, P.J., 1997, unpublished compilation, includes contributions from Madeline Milholland
    TY006Karlstrom, T.N.V., 1964, Quaternary geology of the Kenai Lowland and glacial history of the Cook Inlet region, Alaska: U.S. Geological Survey Professional Paper 443, 69 p., 7 plates, various scales.
    TY007Wilson and Hults edits
    TY008Schmoll 2007 compilation
    TY009Haeussler, 2007
    TY010Detterman, R.L., Plafker, George, Hudson, Travis, Tysdal, R.G., and Pavoni, Nazario, 1974, Surface geology and Holocene breaks along the Susitna segment of the Castle Mountain fault, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-618, scale 1:24,000.
    TY013Bundtzen, T.K., and Jorgenson, Torre, 2005, Lime Hills and western Tyonek quadrangles surficial geologic mapping and ecosystem development anaylsis of glacial deposits: U.S. National Park Service contract.
    TY014Reger, R.D., 1977, Reconnaissance geology of the Talkeetna-Kashwitna area, Susitna River basin, Alaska: Alaska Division of Geological and Geophysical Surveys Alaska Open-File Report AOF-107a, 1 sheet, scale 1:63,360.
    TY016Weber, F.R., 1961, Reconnaissance engineering geology for the selection of highway route from Talkeetna to McGrath, Alaska: U.S. Geological Survey Open-File Report 61-169, 2 sheets, scale 1:250,000.

    arcs
    Characteristics of the arc features in the geology, fold, lineation, and dike coverages are coded in the arc attribute table. Table <cov>.aat includes the following items: ARC-CODE, ARC-PARA1, ARC-PARA2 (not used), and SOURCE. For explanation of SOURCE, see attribute definitions for polygons. (Source: this data set)

    ARC-CODE
    ARC-CODE is a positive integer value (3 3 I) item in the arc attribute table. Values range discontinuously from 0 to 127. Values match one-for-one with geologic features (such as stratigraphic contact, fault, etc.) Some ARC-CODE values have additional modifiers in item ARC-PARA1. (Source: this data set)

    ValueDefinition
    1Stratigraphic or intrusive contact, location certain
    2Stratigraphic or intrusive contact, location approximate
    3Stratigraphic or intrusive contact, location inferred, queried
    4Normal fault, location certain; if ARC-PARA1 = 1, then upthrown side is on right from origin
    5Normal fault, location approximate; if ARC-PARA1 = 1, then upthrown side is on right from origin
    6Normal fault, location inferred or queried; if ARC-PARA1 = 2, then upthrown side on on right from origin
    7Shoreline or riverbank
    8Internal contact or phase change; no symbol drawn
    9Boundary of altered zone or hornfels; no symbol drawn
    10Thrust fault, location certain; teeth on right from origin
    11Thrust fault, location approximate; teeth on right from origin
    12Thrust fault, location inferred or queried; teeth on right from origin
    13Scour limit or trim line (not drawn)
    14Caldera or crater rim
    15Ice contact
    19Moraine limit; tics on right from origin; arc-para1 = 1, 2, 3, or 4 designate moraines of Naptowne glaciation on the Kenai Peninsula
    21Syncline, location certain, digitized in direction of plunge; ARC-PARA1 equals angle of plunge, 0 is no plunge, 1 is plunge of unknown dip
    23Syncline, location inferred or queried; digitized in direction of plunge; ARC-PARA1 equals angle of plunge, 0 is no plunge, 1 is plunge of unknown dip
    24Anticline, location certain, digitized in direction of plunge; ARC-PARA1 equals angle of plunge, 0 is no plunge, 1 is plunge of unknown dip.
    25Anticline, location approximate, digitized in direction of plunge; ARC-PARA1 equals angle of plunge, 0 is no plunge, 1 is plunge of unknown dip
    26Anticline, location inferred or queried, digitized in direction of plunge; ARC-PARA1 equals angle of plunge, 0 is no plunge, 1 is plunge of unknown dip
    28concealed or inferred caldera margin
    30Fault, sense of displacement uncertain; location certain; if arc-para1 = 1, then upthrown side is on the right from origin
    31Fault, sense of displacement uncertain; location approximate
    32Fault, sense of displacement uncertain; location inferred
    34terrace scarp
    35High-angle reverse fault, location certain, teeth on right from origin
    36High-angle reverse fault, location approximate, teeth on right from origin
    37High-angle reverse fault, location inferred, teeth on right from origin
    50Dikes and sills
    51Concealed contact
    52Concealed normal fault; if ARC-PARA1 = 1, then upthrown side is on right from origin
    53Concealed thrust fault
    54Concealed high-angle reverse fault
    55Concealed normal fault, having right lateral oblique slip
    56Concealed normal fault, having left lateral oblique slip
    57Concealed right lateral fault
    58Concealed left lateral fault
    59Concealed shear zone
    60Concealed fault with displacement uncertain
    72Normal fault, location approximate, having right lateral oblique slip
    76Normal fault, location inferred, queried, having right lateral oblique slip
    87Right lateral fault, location certain
    88Right lateral fault, location approximate
    89Right lateral fault, location inferred, queried
    91Left lateral fault, location approximate
    92Left lateral fault, location inferred, queried
    93Lineament
    94Shear zone, certain
    99Bounding line (neatline) of coverage


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    This data set was prepared by Frederic H. Wilson, Chad Hults, and Keith Labay.

  3. To whom should users address questions about the data?

    U.S. Geological Survey, Alaska Science Center
    c/o Frederic H. Wilson
    Geologist
    4210 University Drive
    Anchorage, Alaska 99508
    USA

    907-786-7445 (voice)
    fwilson@usgs.gov


Why was the data set created?

This data set represents part of a systematic effort to release geologic map data for the United States in a uniform manner. Geologic data in this series has been compiled from a wide variety of sources, published and unpublished, ranging from state and regional geologic maps to field mapping.


How was the data set created?

  1. Where did the data come from?

  2. What changes have been made?

    Date: 2009 (change 1 of 1)
    Line work for the geology compilation was hand digitized from material of various media and scale. The arcs and polygons have attributes. The spatial databases are provided in UTM projection and geographic coordinates. The native ARC/Info coverages have been exported to an interchange file format, and also converted to shape files.

    Person responsible for change:

    U.S. Geological Survey, Alaska Science Center
    c/o Frederic H. Wilson
    Geologist
    4210 University Drive
    Anchorage, Alaska 99508
    USA

    907-786-7445 (voice)
    fwilson@usgs.gov


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    There were many types of source materials of varying scale, used to compile this data set. Sources include previously published maps, unpublished mapping, and air photo interpretation. The dates of the mapping range from present to 1960's. Vector features were digitized on screen or from a large digitizing tablet. The digital data has been checked, and the geologic map has been technically reviewed and edited.

  2. How accurate are the geographic locations?

    This data is presented for use at a nominal scale of 1:250,000.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    The complete data set consists of 33 different GIS coverages, 11 geology coverage, 8 fold coverages, 9 lineation coverages, and 5 dike coverages. There is also an associated relational database of geologic units. Each coverage has the extent of a 1:250,000-scale quadrangle. A graphic representation of the database and a report with complete geologic unit descriptions is provided in .pdf format.

  5. How consistent are the relationships among the observations, including topology?

    Each geology coverage is a network coverage containing attributed arcs and polygons. Each polygon has a coded attribute designating the mapped geologic unit. Faults, stratigraphic contacts, and other linear features are represented as arcs. When a fault is also a stratigraphic contact, only a single arc is present. Dangling arcs may be present (fault, dike, lineation, etc.)


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
None. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey
    MS902 Box 25286 Denver Federal Center
    Lakewood, CO 80225
    U.S.A.

    1-888-ASK-USGS (voice)

  2. What's the catalog number I need to order this data set?

    OFR 2009-1108

  3. What legal disclaimers am I supposed to read?

    This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 22-Jun-2009

Metadata author:
U.S. Geological Survey
c/o Nora Shew
4210 University Drive
Anchorage, AK 99508
U.S.A.

907-786-7445 (voice)
nshew@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.4.30 on Mon Jun 22 15:07:04 2009