Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map for the Yukon-Koyukuk basin, Alaska

Metadata also available as - [Outline] - [Parseable text]

Frequently-anticipated questions:


What does this data set describe?

    Title:
    Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map for the Yukon-Koyukuk basin, Alaska
    Abstract:
    The 1:500,000-scale reconnaissance geologic map of the Yukon-Koyukuk basin, Alaska covers more than 80,000 square miles (200,000 square kilometers) of western Alaska, or nearly 15 percent of the total land area of the state. It stretches from the Brooks Range on the north, to the Kuskokwim River and lower reaches of the Yukon River on the south, and from Kotzebue Sound, Seward Peninsula, and Norton Sound on the west, to the Yukon-Tanana Uplands and Tanana-Kuskokwim Lowlands on the east. The region is characterized by isolated hilly areas and low mountain ranges separated by broad alluviated interior and coastal lowlands. Most of the lowlands, except those bordering Kotzebue Sound and Norton Sound, support a heavy vegetation cover. Exposures of bedrock are generally limited to rubble-strewn ridgetops and cutbanks along rivers.

    The data was compiled largely from geologic field data collected between 1953 and 1986 by the U.S. Geological Survey and published as 1:250,000 scale geologic quadrangle maps. Additional data for parts of the Wiseman, Ruby, Medfra, and Ophir quadrangles came from 1:63,360 scale quadrangle map published by the Alaska Division of Geological and Geophysical Surveys. This compilation also incorporates unpublished field data.

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

  1. How should this data set be cited?

    Wilson, F.H., Labay, K.A., Shew, N.B., and Mohadjer, Solmaz, 2005, Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map for the Yukon-Koyukuk basin, Alaska: United States Geological Survey OFR 2005-1341.

    Online Links:

    • http://pubs.usgs.gov/of/2005/1341/

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -162.0
    East_Bounding_Coordinate: -150.0
    North_Bounding_Coordinate: 68.0
    South_Bounding_Coordinate: 63.0

  3. What does it look like?

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

    Calendar_Date: 2005
    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: 4
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -159.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 0.0
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000256
      Ordinates (y-coordinates) are specified to the nearest 0.000256
      Planar coordinates are specified in meters

  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, NSACLASS, NSAMOD, QCLASS, SOURCE, 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 100 to 9325. 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. Some map areas include more detailed Quaternary mapping, requiring some of the NSACLASS values to be subdivided. These geologic units are attributed in the .pat item QCLASS. Each NSACLASS or QCLASS matches with geologic unit labels in LABEL and has a minimum (MIN_AGE) and maximum (MAX_AGE) range, given in million of years (my). 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 the limitations of common GIS fonts, the letters "Mz", "Pz", "Tr", and "Pa" are substituted for the standard symbols for "Mesozoic", "Paleozoic", "Triassic", and "Pennsylvanian." (Source: this data set)

    ValueDefinition
    100Qua - Surficial deposits, undifferentiated (Quaternary); age 0-1.6 my
    102Water
    105Qf - Floodplain and tidal flats deposits (Holocene); age 0-1.6 my
    107Qua - Surficial deposits, undifferentiated (Quaternary); age 0-1.6 my
    108Qua - Surficial deposits, undifferentiated (Quaternary); age 0-1.6 my
    110Qua - Surficial deposits, undifferentiated (Quaternary); age 0-1.6 my
    111Qf - Floodplain and tidal flats deposits (Holocene); age 0.01-1.6 my
    116Qf - Floodplain and tidal flats deposits (Holocene); age 0-0.01 my
    119Qsa - Actively drifting and recently stabilized dune fields (Holocene); age 0-0.01 my
    120Qs - Eolian and water-laid sand and silt sheets and stabilized dune fields (Holocene and Pleistocene); age 0-1.6 my
    125QTgl - Glacial and glaciolacustrine deposits (Pleistocene and Pliocene?); age 0-1.6 my
    135QTgl - Glacial and glaciolacustrine deposits (Pleistocene and Pliocene?); age 0.01-1.6 my
    190QTgl - Glacial and glaciolacustrine deposits (Pleistocene and Pliocene?); age 0.06-1.6 my
    285QTgr - Quartz gravel deposits (Quaternary or Tertiary); age 0.01 - 5.3 my
    300Qab - Alkalic basalt cones and flows (Pleistocene); age 0-1.6 my
    305Qtb - Tholeiitic basalt cones and flows (Holocene? and Pleistocene); age 0-0.01 my
    350QTb - Basalt flows (Pleistocene and Pliocene); age 0.01-5.3 my
    640Ts - Small deposits of nonmarine conglomerate, sandstone, shale, and coal (Tertiary); age 5.3-57.8 my
    1002Td - Dacite and rhyolite lava flows, domes, and volcaniclastic rocks (Eocene and Paleocene); age 1.6-66.4 my
    1004Tb - Basalt flows (Oligocene); age 1.6-66.4 my
    1011Thr - Rhyolite hypabyssal bodies (Miocene to Paleocene, mostly Early Tertiary or Eocene?); age 1.6-66.4 my
    1081Tad - Andesite and basalt lava flows and volcaniclastic rocks and dacite and rhyolite lava flows, domes, and volcaniclastic rocks, undivided (Eocene and Paleocene); age 39-49 my
    1103Ta - Andesite and basalt lava flows and volcaniclastic rocks (Eocene and Paleocene); age 36.6-84 my
    1120Tt - Tuff and tuff breccia (Eocene and Paleocene); age 36.6-66.4 my
    1320Tg - Granite (Eocene or Paleocene); age 57.8-66.4 my
    1600TKad - Andesite and basalt lava flows and volcaniclastic rocks and dacite and rhyolite lava flows, domes, and volcaniclastic and hypabyssal rocks, undivided (early Tertiary and Late Cretaceous); age 52-84 my
    1601TKi - Shallow intrusive rocks of silicic and intermediate composition (Tertiary and Late Cretaceous); age 23.7-97.5 my
    1602TKi - Shallow intrusive rocks of silicic and intermediate composition (Tertiary and Late Cretaceous); 57.8-84 my
    1603TKd - Dacite and rhyolite lava flows, domes, and volcaniclastic and hypabyssal rocks (early Tertiary and Late Cretaceous); age 23.7-97.5 my
    1605TKa - Andesite and basalt lava flows and volcaniclastic rocks (early Tertiary and Late Cretaceous); age 23.7-97.5 my
    1620TKi - Shallow intrusive rocks of silicic and intermediate composition (Tertiary and Late Cretaceous); age 1.6-97.5 my
    1630TKvc - Volcano-plutonic complexes (early Tertiary and Cretaceous); age 23.7-97.5 my
    1641TKi - Shallow intrusive rocks of silicic and intermediate composition (Tertiary and Late Cretaceous); age 23.7-97.5 my
    1650TKi - Shallow intrusive rocks of silicic and intermediate composition (Tertiary and Late Cretaceous); age 23.7-97.5 my
    1655TKg - Granite and granodiorite (early Tertiary and Late Cretaceous); age 23.7-97.5 my
    1660TKm - Monzonite (early Tertiary and Late Cretaceous); age 23.7-97.5 my
    1680TDg - Gabbro and diabase (Tertiary? to Devonian?); age 1.6-408 my
    1815Kcc - Carbonate-clast conglomerate, sandstone and shale (Cretaceous); age 66.4-144 my
    1820Kcvg - Carbonate- and volcanic-clast graywacke and mudstone (Cretaceous); age 66.4-144 my
    1821Kcg - Carbonate-clast graywacke and mudstone (Cretaceous); age 66.4-144 my
    1822Kcc - Carbonate-clast conglomerate, sandstone, and shale (Cretaceous); age 66.4-144 my
    1823Kcvg - Carbonate- and volcanic-clast graywacke and mudstone (Cretaceous); age 66.4-144 my
    1905Ksu - Shale, siltstone, and sandstone, undivided (Cretaceous); age 74.5-87.5 my
    1906Ksu - Shale, siltstone, and sandstone, undivided (Cretaceous); age 66.4-97.5 my
    1940Kss - Shallow marine sandstone, siltstone, and shale (Late Cretaceous); age 91-144 my
    1941Ks - Fluvial and shallow marine sandstone and shale, undivided (Cretaceous); age 66.4-97.5 my
    1942Ksu - Shale, siltstone, and sandstone, undivided (Cretaceous); age 66.4-113 my
    1970Ksu - Shale, siltstone, and sandstone, undivided (Cretaceous); age 66.4-113 my
    1971Kss - Shallow marine sandstone, siltstone, and shale (Late Cretaceous); age 66.4-113 my
    1985Ksc - Fluvial and shallow marine sandstone and conglomerate (Late Cretaceous); age 66.4-113 my
    1990Kqc - Quartz- and metagraywacke-clast conglomerate, sandstone, and shale (Cretaceous); age 91-144 my
    2020Ks - Fluvial and shallow marine sandstone and shale, undivided (Cretaceous); age 66.4-144 my
    2021Ks - Fluvial and shallow marine sandstone and shale, undivided (Cretaceous); age 88.5-113 my
    2023TKic - Complexes of shallow intrusive rocks and altered Cretaceous sedimentary rocks of the Yukon-Koyukuk basin, undivided (early Tertiary and Cretaceous); age 57.8-113 my
    2030Kmc - Mafic igneous-clast conglomerate, sandstone, and mudstone (Cretaceous); age 91-113 my
    2101Kms - Marine sandstone and siltstone (Cretaceous); age 91-113 my
    2106Kvc - Volcanic-clast conglomerate, sandstone, and shale (Cretaceous); age 66.4-144 my
    2125Kqs - Quartz-carbonate sandstone (Early Cretaceous); age 131-144 my
    2152Kcs - Offshore calcareous sandstone, siltstone, and shale (Cretaceous); age 97.5-144 my
    2180Kvg - Volcanic-clast graywacke and mudstone (Cretaceous); age 97.5-144 my
    2182Kgc - Volcanic graywacke and conglomerate (Early Cretaceous?); age 119-144 my
    2210Krd - Rhyolite, dacite, and trachyte lava flows and volcaniclastic rocks (Late Cretaceous); age 57.8-97.5 my
    2320Ktg - Tuff, volcanic graywacke, and mudstone (Early Cretaceous); age 97.5-144 my
    2330Kv - Andesite and basalt lava flows and volcaniclastic rocks (Early Cretaceous); age 97.5-163 my
    2335Kbd - Spilitic basalt and diabase (Early Cretaceous); age 97.5-144 my
    2336Kft - Shoshonitic tuffs and lava flows (Early Cretaceous); age 113-124 my
    2410Kgu - Granitic rocks of uncertain affinities (Cretaceous?); age 66.4-144 my
    2420Kgd - Granodiorite and granite (Late Cretaceous); age 66.4-144 my
    2460Ksm - Syenite and monzonite (Late Cretaceous); age 66.4-88.5 my
    2515Kgr - Granite and granodiorite (Early Cretaceous); age 110-144 my
    2530Kgr - Granite and granodiorite (Early Cretaceous); age 110-144 my
    2535Knsy - Syenite, monzonite, and nepheline syenite; nepheline syenite unit (Early Cretaceous); age 97.5-144 my
    2545Ksy - Syenite, monzonite, and nepheline syenite (Early Cretaceous); 97.5-144 my
    3380Jgt - Trondhjemite and tonalite (Late and Middle Jurassic); age 131-152 my
    3496MzPzum - Mafic-ultramafic complexes (Mesozoic and Paleozoic?); age 152-570 my
    3497MzPzum - Mafic-ultramafic complexes (Mesozoic and Paleozoic?); age 152-570 my
    3498MzPzum - Mafic-ultramafic complexes (Mesozoic and Paleozoic?); age 152-570 my
    3851JMc - Chert, cherty tuff, argillite, crystal-lithic tuff, volcanic breccia, and conglomerate (Jurassic? to Mississippian); age 200-360 my
    4032Trs - Spiculite and sandy limestone (Late Triassic); age 208-225 my
    5021TrMg - Graywacke, grit, and argillite (Triassic? to Mississippian?); age 187-360 my
    5131TrMbc - Pillow basalt, chert, and minor agglomerate (Triassic? to Mississippian?); age 208-408 my
    5140JDv - Altered basalt, gabbro, chert, argillaceous rocks, tuff, graywacke, and carbonate rocks (Jurassic to Devonian); age 144-360 my
    5145KJm - Melange (Early Cretaceous? and Jurassic); age 144-408 my
    5150MzPzum - Mafic-ultramafic complexes (Mesozoic and Paleozoic?); age 187-286 my
    5241MzZma - Metabasite (Mesozoic? to Proterozoic?); age 66.4-570 my
    5242MzZmr - Metabasite (Mesozoic? to Proterozoic?); age 245-900 my
    5243MzZms - Metabasite (Mesozoic? to Proterzoic?); age 66.4-570 my
    5280JDv - Altered basalt, gabbro, chert, argillaceous rocks, tuff, graywacke, and carbonate rocks (Jurassic to Devonian); age 187-360 my
    5295MzZfm - Metabasite and felsic schist, undivided (Mesozoic? to Proterozoic?); age 66.4-2500 my
    5310DCd - East Fork Hills Formation (Devonian to Cambrian); age 374-570 my
    5320Pzcs - Carbonate rocks (Paleozoic); age 360-570 my
    5321PzZus - Pelitic schist, calc schist, and quartzite and carbonate rocks, undivided (Paleozoic and Proterozoic?); age 360-570 my
    5322PzZss - Pelitic schist, calc schist, and quartzite (Paleozoic and Proterozoic?); age 360-570 my
    5340Pzcr - Carbonate rocks (Paleozoic); age 245-900 my
    5521MzZrc - Complex of the Reindeer Hills (Mesozoic to Proterozoic?); age 245-570 my
    5525Pzca - Carbonate rocks (Paleozoic); age 245-408 my
    5542MzPzq - Quartzite, grit, argillite, and quartz-mica schist (Early Paleozoic and Proterozoic?); age 144-900 my
    5560Pzpa - Phyllite and subordinate metagraywacke (Paleozoic?); age 245-408 my
    5561Pzpr - Phyllite (Paleozoic?); age xxx
    5565Pzg - Metagraywacke and subordinate phyllite (Paleozoic?); age 208-408 my
    5740Ps - Sandstone, sandy limestone, and conglomerate (Permian); age 245-286 my
    6080TrDc - Chert, argillite, and limestone (Triassic? to Devonian); age 208-374 my
    6522Dgnr - Granitic gneiss (Devonian); age 360-408 my
    6523Dgna - Granitic gneiss (Devonian); age 360-408 my
    6620DSp - Paradise Fork Formation (Early Devonian and Silurian); age 421-438 my
    6960DSw - Whirlwind Creek Formation (Devonian and Late Silurian); age 387-421 my
    7261Df - Felsic schist (Devonian); age 360-408 my
    7520Ont - Novi Mountain and Telsitna Formations, undivided (Ordovician); age 438-505 my
    7581Oc - Chert and argillite (Ordovician); age 438-505 my
    8300PzZq - Quartzite, grit, argillite, and quartz-mica schist (Early Paleozoic and Proterozoic?); age 505-900 my
    8500PzZi - Granitic gneiss (Paleozoic? and Proterozoic); age 360-705 my
    8601PzZsr - Pelitic schist, calc, schist, and quartzite (Paleozoic and Proterozoic?); age 286-900 my
    8602PzZsa - Pelitic schist, calc schist, and quartzite (Paleozoic and Proterozoic); age 286-900 my
    8605PzZua - Pelitic schist, calc schist, and quartzite and carbonate rocks, undivided (Paleozoic and Proterozoic); age 286-900 my
    8610Zc - Calc schist, quartz-mica schist, and greenstone (Proterozoic); age 360-900 my
    8625PzZsr - Pelitic schist, calc schist, and quartzite (Paleozoic and Proterozoic?); age 360-900 my
    8640Zs - Pelitic schist, quartzite, quartzo-feldspathic gneiss, and greenstone (Proterozoic); age 570-1600 my
    8641Zs - Pelitic schist, quartzite, quartzo-feldspathic gneiss, and greenstone (Proterozoic); age 570-900 my
    8700Zv - Metavolcanic rocks (Late Proterozoic); age 360-900 my
    8801MzZkc - Complex of the Kokrines Hills (Mesozoic to Proterozoic?); age 360-900 my
    9325PzZsr - Pelitic schist, calc schist, and quartzite (Paleozoic and Proterozoic?); age 144-2500 my

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

    HFS - contact metamorphism; hornfels Q - queried unit

    SOURCE
    SOURCE is a character (6 8 C) item found in both the arc and polygon 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, and DRG or DLG files. (Source: this data set)

    ValueDefinition
    AR003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    BM002Karl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., and Schmidt, J.M., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.
    BM003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    BT002Patton, W.W., Jr., and Miller, T.P., 1973, Bedrock geologic map of the Bettles and southern part of Wiseman quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-492, scale 1:250,000.
    BT003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    CA002Patton, W.W., Jr., 1967, Regional geologic map of the Candle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-492, scale 1:250,000.
    CA003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    HU002Patton, W.W., Jr., and Miller, T.P., 1966, Regional geologic map of the Hughes quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Series Map I-459, scale 1:250,000.
    HU003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    KT002Patton, W.W., Jr., 1966, Regional geology of the Kateel River quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-437, 1 sheet, scale 1:250,000.
    KT003Patton, W.W., Jr., unpub. data, 1997
    KT004Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    MD002Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811A, 1 sheet, scale 1:250,000.
    MD003Bundtzen, T.K., Pinney, D.S., and Laird, G.M., 1997, Preliminary geologic map and data table from the Ophir C-1 and western Medfra C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File 97-46, scale 1:63,360, 10 p.
    MD004Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    MZ002Patton, W.W., Jr., Miller, T.P., Chapman, R.M., and Yeend, Warren, 1978, Geologic map of the Melozitna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-1071, scale 1:250,000.
    MZ003Roeske, S.M., Dusel-Bacon, Cynthia, Aleinikoff, J.N., Snee, L.W., and Lanphere, M.A., 1995, Metamorphic and structural history of continental crust at a Mesozoic collisional margin, the Ruby terrane, central Alaska: Journal of Metamorphic Geology, v. 13, p. 25-40.
    MZ004Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    NL003Patton, W.W., and Moll-Stalcup, E.J., 2000, Geologic map of the Nulato quadrangle, west-central Alaska: U.S. Geological Survey Geologic Investigations Series I-2677, 41 p., 1 sheet, scale 1:250,000.
    NL004Patton, W.W., Jr., Wilson, F.H., Labay, Keith, Shew, Nora, unpub. data, 2005
    NR002Patton, W.W., Jr., unpub. data, 2005
    NR003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., Shew, Nora, unpub. data, 2005
    OP002Chapman, R.M., Patton, W.W., Jr., and Moll, E.J., 1985, Reconnaissance geologic map of the Ophir quadrangle, Alaska: U.S. Geological Survey Open-File Report 85-203, 1 sheet, scale 1:250,000.
    OP005Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    RB009Patton, W.W., Jr., unpub. data, 2001
    SE002Patton, W.W., Jr., and Miller, T.P., 1968, Regional geologic map of the Selawik and southeastern Baird Mountains quadrangles, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-530, scale 1:250,000.
    SE003Karl, S.M., Dumoulin, J.A., Ellersieck, Inyo, Harris, A.G., 1989, Preliminary geologic map of the Baird Mountains and part of the Selawik quadrangles, Alaska: U.S. Geological Survey Open-File Report 89-551, scale 1:250,000, 65 p.
    SE004Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    SH002Patton, W.W., Jr., Miller, T.P., and Tailleur, I.L., 1968, Regional geologic map of the Shungnak and southern part of the Ambler River quadrangles, Alaska: U.S. Geological Survey Miscellaneous Geological Investigations Map I-554, scale 1:250,000.
    SH003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    SH004Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    SP003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    TN008Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    UL002Patton, W.W., Jr., and Moll-Stalcup, E.J., 1996, Geologic map of the Unalakleet quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2559, scale 1:250,000, 39 p.
    UL003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005
    WI003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, unpub. data, 2005

    arcs
    Characteristics of the arc features in the geology coverages are coded in the arc attribute table. Table <cov>.aat includes the following items: ARC-CODE, ARC-PARA1, 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 1 to 99. Values match one-for-one with geologic features (such as stratgraphic boundary, fault, etc.). Some ARC-CODE features 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 intusive contact, loaction inferred, queried
    4Normal fault, location certain; if ARC-PARA1 = 1, then upthrown side on 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 = 1, then upthrown side is on right from origin
    7Shoreline or riverbank
    9Boundary or altered zone or hornfels
    10Thrust fault, location certain; teeth on right from origin
    11Thrust fault, location approximate; teeth on right from origin
    12Thrust fault, location inferred, queried; teeth on right from origin
    14Caldera or crater rim
    19Internal contact having tics on right from origin
    30Fault, sense of displacement uncertain; location certain
    31Fault, sense of displacement uncertain, location approximate
    32Fault, sense of displacement uncertain, location inferred
    51Contact, concealed
    52Normal fault, concealed; if ARC-PARA1 = 1, then upthrown side is on the right from origin
    53Thrust fault, concealed; teeth on right from origin
    56Concealed normal fault, having left lateral oblique slip
    57Concealed right lateral fault
    58Concealed left lateral fault
    72Normal fault, location approximate, having right lateral oblique slip
    74Normal fault, location approximate, having left lateral oblique slip
    87Right lateral fault, location certain
    88Right lateral fault, location approximate
    90Left lateral fault, location certain
    99Bounding line 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 Keith Labay (contractor), F.H. Wilson (USGS) and Solmaz Mohadjer (contractor)

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

    U.S. Geological Survey
    c/o Frederic H. Wilson
    Geologist
    4200 University Drive
    Anchorage, Alaska 99508-4667
    U.S.A.

    907-786-7448 (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 large-scale field mapping.


How was the data set created?

  1. Where did the data come from?

  2. What changes have been made?

    Date: 2005 (change 1 of 1)
    Linework for the geology compilation was hand digitized from material of various media and scale. The arcs and polygons were attributed. The spatial databases are provided in UTM projection and geographic coordinates. The native ARC/Info coverages have been exported to an interchange file format, .e00, and also converted to Arc/View shape files.

    Person responsible for change:

    U.S. Geological Survey, Alaska Science Center
    c/o Frederic H. Wilson
    Geologist
    4200 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?

    The original source materials for this data set are from various scales (1:63,360 to 1:250,000), medium (digital, mylar, paper), and scope (bedrock, surficial, tectonic). All vector features were originally hand digitized on a large digitizing tablet or on screen. Vector and polygon attributes were assigned based on the original source. The digital data has been visually 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 1:500,000, although individual datasets may contain data for use at larger scales. Details within the attribute tables and metadata provide information on map sources and the appropriate scales for use.

  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 the GIS files and an associated database of geologic units.

  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 coded a 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 (faults, dike, 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
    MS 902 Box 25286 Denver Federal Center
    Lakewood, CO 80225
    USA

    1-888-ASK-USGS (voice)

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

    Open-File Report 2005-1341

  3. What legal disclaimers am I supposed to read?

    This world-wide web 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.

    Although all data and software published on this web-site have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 22-Sep-2005

Metadata author:
U.S. Geological Survey
c/o Nora B. Shew
4200 University Drive
Anchorage, AK 99508
USA

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 Thu Sep 22 14:09:52 2005