Digital data for the geology of the southern Brooks Range, Alaska

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Frequently-anticipated questions:

What does this data set describe?
    Title:
    Digital data for the geology of the southern Brooks Range, Alaska
    Abstract:
    The southern Brooks Range spans northern Alaska from west to east. It has tree- and shrub-covered lowlands and tundra-covered and rocky uplands. Much of the area has ridgelines reaching about 4000 feet, but the central part of the map area has ridgelines exceeding 6000 feet and peaks above 7000 feet. The geology includes the Brooks Range orogen, a contractional mountain belt with a foreland basin on its north side.

    This map has been compiled from published maps and papers, and unpublished mapping by the authors.

    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 (NSA) project, whose goal is to compile geologic, geochemical, geophysical, and other data.

  1. How should this data set be cited?

    Labay, Keith A., Wilson, Frederic H., Bleick, Heather, and Shew, Nora B., 2008, Digital data for the geology of the southern Brooks Range, Alaska: U.S. Geological Survey Open-File Report OFR 2008-XXXX.

    Online Links:

    • http//pubs.usgs.gov/of/2008/XXXX

    This is part of the following larger work.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -162.0
    East_Bounding_Coordinate: -146.0
    North_Bounding_Coordinate: 68.0
    South_Bounding_Coordinate: 66.75

  3. What does it look like?

    XXX (XXX)
    XXX

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

    Calendar_Date: 2008
    Currentness_Reference: publication date

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

    Geospatial_Data_Presentation_Form: 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: 0.9995
      Longitude_of_Central_Meridian: -159.0
      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 0.000256
      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, QCLASS, LITH2, SOURCE, NSACLASS, NSAMOD, LABEL, MIN_AGE, and MAX_AGE. Item LITH2 is used to generate the southern Brooks range map of Till and others, in press. NSACLASS is used for creating the generalized geologic map of Alaska. Items CLASS and SOURCE together identify the original mapping of the geologic unit. (Source: this data set)

    LITH2
    LITH2 is a positive integer value (4 5 B) item in the polygon attribute table. Values range discontinuously from 0 to 52090. LITH2 is a numeric code for the geologic unit (LABEL), as shown on the southern Brooks range map by Till and others, in press. LITH2 to LABEL is a one-to-one relationship. NOTE: Because of the limitations of common GIS fonts, the letters "C", "Mz", "Pz", "Tr", and "Z" are substituted for the standard symbols for "Cambrian", "Mesozoic", "Paleozoic", "Triassic", and "Proterozoic". (Source: this data set)

    ValueDefinition
    100Qs - Surficial sedimentary deposits, undivided (Quaternary)
    102water
    2180Kvg - Volcanic lithic sandstone and mudstone (Cretaceous)
    5145KJm - Melange (Cretaceous to Jurassic)
    52000Dsq - Quartz-mica schist (Devonian)
    52001DZsc - Calcareous schist (Devonian to Proterozoic)
    52002PzZb - Metasedimentary rocks of Bluecloud Mountain (Paleozoic to Proterozoic?)
    52003Dg - Granitic orthogneiss (Devonian)
    52004Da - Ambler sequence (Devonian)
    52006Pzsg - Mafic schist (Paleozoic)
    52007Pzpg - Phyllite and graywacke (Paleozoic?)
    52008DZm - Metamorphic rocks (Devonian to Proterozoic?)
    52009JDab - Mafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane (Early Jurassic to Devonian)
    52011Zg - Granitic orthogneiss (Proterozoic)
    52012PzZem - Metamorphic rocks of the Ernie Lake area (Paleozoic to Proterozoic)
    52013Zam - Metamorphic rocks of Mt. Angayukaqsraq (Proterozoic)
    52015OZc - Older carbonate rocks of the Nanielik antiform (Middle Ordovician to Proterozoic?)
    52016DOc - Younger carbonate rocks of the Nanielik antiform (Middle Devonian to Ordovician)
    52017Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian)
    52018Dhf - Hunt Fork Shale (Late Devonian)
    52019Dl - Metalimestone (Devonian)
    52021PzZqs - Quartz-rich metasedimentary rocks (Paleozoic to Proterozoic?)
    52022Khs - Hammond River shear zone (Cretaceous?)
    52023Pzm - Marble (Paleozoic)
    52026TrCs - Sedimentary rocks (Triassic to Carboniferous)
    52027Ml - Carbonate rocks (Mississippian)
    52028MDk - Kanayut Conglomerate (Lower Mississippian? and Upper Devonian)
    52030Pzp - Phyllite (Paleozoic?)
    52032Pzj - Metasedimentary rocks of Jesse Mountain (Paleozoic)
    52034PzZbs - Biotite schist (Paleozoic to Proterozoic?)
    52035PzZsr - Ruby schist (Paleozoic to Proterozoic?)
    52036Km - Migmatite (Cretaceous)
    52037Kg - Granitic rocks (Cretaceous)
    52038Ks - Conglomerate, sandstone, and shale (Cretaceous)
    52039QTb - Basalt (Quaternary? or Tertiary?)
    52041DZsc - Calcareous schist; metachert and conglomerate subunit (Devonian to Proterozoic)
    52042Ozc - Older carbonate rocks of the Nanielik antiform; restricted to Ordovian strata only (Middle Ordovician to Proterozoic?)
    52043Dmu - Metasedimentary and lesser metaigneous rocks; volcanic-rock bearing (Middle and Late Devonian)
    52044Dhf - Hunt Fork Shale (Late Devonian)
    52045DZgn - Schist and paragneiss (Devonian to Proterozoic?)
    52046PzZcm - Metasedimentary and metavolcanic rocks, undivided (Paleozoic and Proterozoic?)
    52047PzZm - Mafic schist (Paleozoic? to Proterozoic?)
    52048DZsm - Schist and marble, undivided (Devonian to Proterozoic?)
    52049Spl - Black phyllite and metalimestone (Silurian)
    52052Dmu - Metasedimentary and lesser metaigneous rocks; iron-rich and calcareous components (Middle and Late Devonian)
    52053Pzw - Metasedimentary rocks (Paleozoic)
    52055Pzw - Metasedimentary rocks; northern belt (Paleozoic)
    52056Dn - Noatak Sandstone (Devonian)
    52057SCvs - Volcanic and sedimentary rocks (Silurian to Cambrian)
    52061Mkl - Kayak Shale of Endicott Group and Lisburne Group (Mississippian)
    52062Mu - Metasedimentary rocks, undivided (Mississippian)
    52063DZsc - Calcareous schist; abundant albite porphyroblasts (Devonian to Proterozoic)
    52065Pzbq - Black quartzite (Paleozoic?)
    52066Pzb - Black phyllite and siliceous phyllite (Paleozoic?)
    52067PzZg - Granitic rocks (Paleozoic to Proterozoic?)
    52068Zam - Metamorphic rocks of Mt. Angayukaqsraq (Proterozoic)
    52069DOb - Baird Group (Devonian to Ordovician)
    52070MDer - Eli River sequence (Mississippian and Devonian)
    52071Mcp - Carbonaceous chert and siliceous phyllite (Mississippian)
    52073MzPzs - Serpentintite (Mesozoic? to Paleozoic?)
    52074MDe - Endicott Group, undivided (Mississippian and Devonian)
    52075JDk - Rocks of the Kivivik Creek sequence (Jurassic to Devonian)
    52076MzDm - Igneous and sedimentary rocks of the Maiyumerak Mountains (Mesozoic? to Devonian)
    52077Mc - Quartz-rich conglomerate (Mississippian?)
    52081Dps - Lithic sandstone and shale (Devonian)
    52083Dps - Lithic sandstone and shale; schistose (Devonian)
    52084DSc - Carbonate rocks of Cosmos Hills (Devonian and Silurian)
    52085Pzbs - Black metasedimentary rocks (Paleozoic)
    52086Pzpc - Carbonate rocks of phyllite belt (Paleozoic)
    52087Pzsm - Marble of the Schist belt (Paleozoic)
    52088Mkkl - Kekiktuk Conglomerate(?), Kayak Shale of Endicott Group, and Lisburne Group (Mississippian)
    52089MDk - Kanayut Conglomerate; area not differentiated from Noatak Sandstone (Lower Mississippian? and Upper Devonian)
    52090JCs - Sedimentary rocks (Jurassic to Carboniferous)

    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 for the statewide database. This data set represents a generalized map, thus it is possible that a geologic unit consists of multiple NSACLASS values. Each NSACLASS matches to a geologic unit label in LABEL and has 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 "C", "Mz", "Pz", "Tr", and "Z" are substituted for the standard symbols for "Cambrian", "Mesozoic", "Paleozoic","Triassic", and "Proterozoic". (Source: this data set)

    ValueDefinition
    100Qs - Surficial sedimentary deposits, undivided (Quaternary); QCLASS = 1000
    102water; QCLASS = 102
    350QTb - Basalt (Quaternary? or Tertiary?)
    1990Ks - Conglomerate, sandstone, and shale (Cretaceous)
    2030Ks - Conglomerate, sandstone, and shale (Cretaceous)
    2180Kvg - Volcanic lithic sandstone and mudstone (Cretaceous)
    2492Kg - Granitic rocks (Cretaceous)
    2610Km - Migmatite (Cretaceous)
    2650Khs - Hammond River shear zone (Cretaceous?)
    3498MzPzs - Serpentinite (Mesozoic? to Paleozoic?)
    4951MzDm - Igneous and sedimentary rocks of the Maiyumerak Mountains (Mesozoic? to Devonian)
    5001JDk - Rocks of the Kivivik Creek sequence (Jurassic to Devonian)
    5003JCs - Sedimentary rocks (Jurassic to Carboniferous)
    5004TrCs - Sedimentary rocks (Triassic to Carboniferous)
    5133JDab - Mafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane (Early Jurassic to Devonian)
    5140JDab - Mafic metavolcanic and metaintrusive rocks, metachert, metalimestone, and amphibolite of the Angayucham terrane (Early Jurassic to Devonian)
    5145KJm - Melange (Cretaceous to Jurassic?)
    5525DSc - Carbonate rocks of Cosmos Hills (Devonian and Silurian)
    5560Pzp - Phyllite (Paleozoic?)
    5565Pzpg - Phyllite and graywacke (Paleozoic?)
    5570Pzpc - Carbonate rocks of phyllite belt (Paleozoic)
    6200Mcp - Carbonaceous chert and siliceous phyllite (Mississippian)
    6300MDe - Endicott Group, undivided (Mississippian and Devonian)
    6305Mkkl - Kekiktuk Conglomerate(?), Kayak Shale of Endicott Group, and Lisburne Group (Mississippian)
    6320Ml - Carbonate rocks (Mississippian)
    6328Mkl - Kayak Shale of Endicott Group and Lisburne Group (Mississippian)
    6331Pzbs - Black metasedimentary rocks (Paleozoic)
    6360Mc - Quartz-rich conglomerate (Mississippian?)
    6365Mu - Metasedimentary rocks, undivided (Mississippian)
    6686Spl - Black phyllite and metalimestone (Silurian)
    6720SCvs - Volcanic and sedimentary rocks (Silurian to Cambrian)
    6850Pzj - Metasedimentary rocks of Jesse Mountain (Paleozoic)
    6900Dn - Noatak Sandstone (Devonian)
    6914MDk - Kanayut Conglomerate (Lower Mississippian? and Upper Devonian)
    6915MDk - Kanayut Conglomerate (Lower Mississippian? and Upper Devonian)
    6925Dhf - Hunt Fork Shale (Late Devonian)
    6927Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian)
    6951Dl - Metalimestone (Devonian)
    6972Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian)
    6973Dmu - Metasedimentary and lesser metaigneous rocks (Middle and Late Devonian)
    6980DOc - Younger carbonate rocks of the Nanielik antiform (Middle Devonian to Ordovician)
    6982MDer - Eli River sequence (Mississippian and Devonian)
    6983Pzm - Marble (Paleozoic)
    7000Pzsg - Mafic schist (Paleozoic)
    7200Dps - Lithic sandstone and shale (Devonian)
    7215Pzsm - Marble of the Schist belt (Paleozoic)
    7225Dhf - Hunt Fork Shale (Late Devonian)
    7235Pzb - Black phyllite and siliceous phyllite (Paleozoic?)
    7250Dg - Granitic orthogneiss (Devonian)
    7260Da - Ambler sequence (Devonian)
    7360DZsm - Schist and marble, undivided (Devonian to Proterozoic?)
    7361DZgn - Schist and paragneiss (Devonian to Proterozoic?)
    7740OZc - Older carbonate rocks of the Nanielik antiform (Middle Ordovician to Proterozoic?)
    7741OZc - Older carbonate rocks of the Nanielik antiform (Middle Ordovician to Proterozoic?)
    8601PzZbs - Biotite schist (Paleozoic to Proterozoic?)
    8602Dsq - Quartz-mica schist (Devonian)
    8603PzZqs - Quartz-rich metasedimentary rocks (Paleozoic to Proterozoic?)
    8604PzZb - Metasedimentary rocks of Bluecloud Mountain (Paleozoic to Proterozoic?)
    8605DZsc - Calcareous schist (Devonian to Proterozoic)
    8607DZsc - Calcareous schist (Devonian to Proterozoic)
    8608DZsc - Calcareous schist (Devonian to Proterozoic)
    8611PzZem - Metamorphic rocks of the Ernie Lake area (Paleozoic to Proterozoic)
    8655PzZcm - Metasedimentary and metavolcanic rocks, undivided (Paleozoic and Proterozoic?)
    8661PzZm - Mafic schist (Paleozoic? to Proterozoic?)
    8852DZm - Metamorphic rocks (Devonian to Proterozoic?)
    9045PzZg - Phyllite and graywacke (Paleozoic?)
    9060Zg - Granitic orthogneiss (Proterozoic)
    9300Zam - Metamorphic rocks of Mt. Angayukaqsraq (Proterozoic)
    9325PzZsr - Ruby schist (Paleozoic to Proterozoic?)

    NSAMOD
    NSAMOD is a character (8 10 C) item in the polygon attribute table. It contains modifiers of the geologic unit. (Source: this data set)

    HFS - contact metamorphism, hornfels

    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###, wher 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, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000.
    AR004Till. A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    BM004Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    BT002Patton, W.W., Jr., and Miller, T.P., 1973, Bedrock geologic map of 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, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000.
    BT005Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    BV004Wilson/Hults edits 8/22/2007
    BV006Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    CH004Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    CS002Brosge, W.P., and Reiser, H.N., 2000, Geology of the Christian quadrangle, Alaska: U.S. Geological Survey Open-File Report 00-192, scale 1:250,000.
    CS003Till, A.B., Dumoulin, J.A., Phillips, J.D., Stanley, R.G., and Crews, Jesse, in prep., Generalized bedrock geologic map, Yukon flats region, east-central Alaska: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, pamphlet, 1 plate, scale 1:500,000.
    CS004Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    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, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000.
    HU004Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    SE003Karl, 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, 65p., 1 sheet, scale 1:250,000.
    SE005Till, A.G., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    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 Geologic Investigations Map I-554, scale 1:250,000.
    SH004Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconnaissance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Series Map SIM-2909, scale 1:500,000.
    SH005Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    SP003Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, in prep., Reconniassance geologic map and digital data for the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Map SIM-2909, scale 1:500,000.
    SP004Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.
    WI007Till, A.B., Dumoulin, J.A., Harris, A.G., Moore, T.E., Bleick, Heather, and Siwiec, Benjamin, in press, Bedrock geologic map of the southern Brooks Range, Alaska, and accompanying conodont data: U.S. Geological Survey Scientific Investigations Map SIM-XXXX, scale 1:500,000.

    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 stratigraphic 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 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
    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
    30Fault, sense of displacement unknown, location certain
    31Fault, sense of displacement unknown, location approximate
    32Fault, sense of displacement unknown, location inferred or queried
    52Normal fault, concealed; if ARC-PARA1 = 1, then upthrown side is on right from origin
    53Thrust fault, concealed; teeth on right from origin
    57Concealed right lateral fault
    60Concealed fault, sense of displacement unknown
    87Right lateral fault, location certain
    88Right lateral fault, location approximate
    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 (USGS), Nora Shew (USGS), David Pray (contractor), Nathan Pannkuk (contractor), Lana Cohen (contractor), Jeanie Yarnell (contractor)

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

    U.S. Geological Survey
    c/o Alison B. Till
    Geologist
    4200 University Drive
    Anchorage, Alaska 99508
    U.S.A.

    907-786-7444 (voice)
    atill@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: 2007 (change 1 of 1)
    Line work 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, and also converted to shape files. Please note that shape files do not preserve arc directions, which help determine fault movement.

    Person responsible for change:

    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

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 and unpublished mapping. The dates of the mapping range from the present to 1950's. Vector features were digitized on a large digitizing tablet or on screen from a scanned image. Vector and polygon attributes were assigned based on the original source. 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 1:500,000.

  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 11 geology GIS converages. There is also an associated relational database of geologic units. Each coverage has the full or partial extent of a 1:250,000 scale quadrangle. A graphic representation of the database (map) and a report including 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 polyons. 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 (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 2008-XXXX

  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: 03-Mar-2008

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 Mon Mar 3 16:10:38 2008