Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map for the Kodiak Islands, 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 Kodiak Islands, Alaska
    Abstract:
    The 1:500,000-scale reconnaissance geologic map of the Kodiak Islands, Alaska covers more than 4,800 square miles (12,500 square kilometers) of south central Alaska. The Kodiak Islands are located on the west side of the Gulf of Alaska and are one of the largest areas of exposure of flysch and melange of the Chugach terrane of southern Alaska.

    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., Mohadjer, Solmaz, and Shew, Nora, 2005, Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map for the Kodiak Islands, Alaska: United States Geological Survey OFR 2005-1340.

    Online Links:

    • http://pubs.usgs.gov/of/2005/1340/

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -156.0
    East_Bounding_Coordinate: -151.5
    North_Bounding_Coordinate: 59.0
    South_Bounding_Coordinate: 56.0

  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: 5
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -153.0
      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 geoloygy 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 5810. 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
    100Qs - Surficial deposits (Quaternary), undivided; age 0-1.6 my
    101Ice
    102Water
    105Qa - Alluvial deposits (Quaternary); age 0-1.6 my
    106Qaf - Alluvial fan deposits (Quaternary); age 0-1.6 my
    108Qls - Landslide deposits (Quaternary); age 0-1.6 my
    115Qb - Marine beach and estuarine deposits (Quaternary); age 0-0.01 my
    117Qmt - Marine terrace deposits (Quaternary); age 0-1.6 my
    127Qrg - Rock glacier deposits (Holocene); age 0-0.01 my
    130Qad - Drift, Alaskan Glaciation (Neoglacial_ (Holocene); age 0-0.01 my
    135Qblu - Drift, undivided, Brooks Lake Glaciation (Pleistocene); age 0.01-1.6 my
    137Qbln - Drift, Newhalen advance, Brooks Lake Glaciation (Pleistocene); age 0.01-1.6 my
    138Qblil - Drift, Iliamna advance, Brooks Lake Glaciation (Pleistocene); age 0.01-1.6 my
    190Qmhd - Drift, Mak Hill Glaciation (Pleistocene); age 0.06-1.6 my
    300Qv - Volcanic rocks, undivided (Quaternary); age 0-1.6 my
    311Qv - Volcanic rocks, undivided (Quaternary); age 0-1.6 my
    401Qv - Volcanic rocks, undivided (Quaternary); age 0-1.6 my
    450QTv - Volcanic rocks (Quaternary and Pliocene?); age 0.01-23.7 my
    550Ttg - Tugidak Formation (late Pliocene and early Pleistocene); age 1.6-5.3 my
    565Ty - Albatross sedimentary sequence of Clendenen and others (1992) (Pliocene or late Miocene); age 0.01-23.7 my
    580Tnc - Narrow Cape Formation (middle Miocene); age 5.3-36.6 my
    581Tsti - Siltstone of Trinity Islands of Clendenen and others (1992) (earliest Miocene or late Oligocene); age 16.6-30 my
    650Th - Hemlock Conglomerate (late Oligocene); age 16.5-30 my
    660Tsk - Sitkinak Formation (Oligocene); age 23.7-36.6 my
    740Tsi - Sitkalidak Formation (Oligocene and Eocene); age 23.7-57.8 my
    850Tc - Copper Lake Formation (early Eocene and Paleocene(?)); age 36.6-66.4 my
    960Tghc - Ghost Rocks Formation, coherent sedimentary rocks (Paleocene and Late Cretaceous?); age 63.6-66.4 my
    961Tghs - Ghost Rocks Formation, sandstone-rich unit, undivided (Paleocene?); age 63.6-66.4 my
    962Tgha - Ghost Rocks Formation, argillite-rich unit, undivided (Paleocene?); age 63.6-66.4 my
    1051Tab - Volcanic rocks of Barrier Range (late Tertiary); age 3.4-30.0 my
    1151Tgvb - Ghost Rocks, basaltic volcanic and hypabyssal rocks (Tertiary or Cretaceous?); age 57.8-66.4 my
    1250Ti - Intrusive rocks (Pliocene and late Miocene); age 1.6-14.4 my
    1300Tegr - Younger granitic rocks (Eocene?); age 36.6-66.4 my
    1320Tg - Granitic rocks (Paleocene); age 57.8-66.4 my
    1780Tgh - Ghost Rocks Formation, undivided (Paleocene and Late Cretaceous?); age 57.8-74.5 my
    1917Kkd - Kodiak Formation (Late Cretaceous); age 66.4-84 my
    1955Kk - Kaguyak Formation (Late Cretaceous); age 66.4-74.5 my
    2130Kcct - Cape Current terrane of Connelly (1978) (Late Cretaceous); age 66.4-97.5 my
    2150Khe - Herendeen Formation (Early Cretaceous); age 119-138 my
    2190Kmk - Uyak Complex (Early Cretaceous); age 88.5-193 my
    2197Kmu - Gabbroic and ultramafic rock (unknown age, assigned to melange); age 66.4-570 my
    3010Jn - Naknek Formation (Late Jurassic); age 144-163 my
    3012Jnn - Naknek Formation, Northeast Creek Sandstone Member (Oxfordian); age 156-163 my
    3013Jnst - Naknek Formation, Snug Harbor Siltstone Member (Kimmeridgian and Oxfordian); age 152-163 my
    3014Jni - Naknek Formation, Indecision Creek Sandstone Member (Tithonian and Kimmeridgian); age 144-156 my
    3016Jnc - Naknek Formation, Chisik Conglomerate Member (Late Jurassic); age 156-163 my
    3020Js - Shelikof Formation (Middle Jurassic); age 163-169 my
    3190Jk - Kialagvik Formation (Middle and Early Jurassic); age 169-193 my
    3250Jt - Talkeetna Formation (Early Jurassic, Late Triassic?); age 193-225 my
    3610Jsch - Schist of Kodiak Island (Jurassic); 193-230 my
    4020Trk - Kamishak Formation (Late Triassic); age 187-225 my
    4150Trss - Shuyak Formation, sedimentary member (Late Triassic); age 208-230 my
    4230Trv - Volcanic rocks (Late Triassic); age 208-230 my
    4240Trvm - Mafic dikes, sills, and plugs (Triassic?); age 208-245 my
    4250Trvs - Shuyak Formation, volcanic member (Late Triassic); age 208-230 my
    4310Trqd - Afognak pluton (Triassic); age 187-210 my
    5730Pls - Limestone (Permian); age 245-286 my
    5810Pv - Volcanic rocks (Permian?); age 240-286 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
    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., unpub. data, 2005
    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, Digital data for the geologic framework of the Alaska Peninsula, southwest Alaska, and the Alaska Peninsula terrane: 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.
    KD002Moore, G.W., 1967, Preliminary geologic map of Kodiak Island and vicinity, Alaska: U.S. Geological Survey Open-File Report 67-161 (271), 1 sheet, scale 1:250,000.
    KD003Moore, G.W., 1969, New formations on Kodiak and adjacent islands, Alaska, in Cohee, G.V., Bates, R.G., and Wright, W.B., Changes in stratigraphic nomenclature by the U.S. Geological Survey 1967: U.S. Geological Survey Bulletin 1274-A, p. A27-A35.
    KD004Connellly, 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.
    KD005Coonrad, W.L., and Wilson, F.H., unpub. data, 1978
    KD006Moore, J.C., Byrne, Tim, Plumley, P.W., Reid, Mary, Gibbons, Helen, and Coe, R.S., 1983, Paleogene evolution of the Kodiak Islands, Alaska: Consequences of ridge-trench interaction in a more southerly latitude: Tectonics, v. 2, no. 3, p. 265-293.
    KG002Moore, G.W., 1967, Preliminary geologic map of Kodiak Island and vicinity, Alaska: U.S. Geological Survey Open-File Report 67-161 (271), 1 sheet, scale 1:250,000.
    KG003Moore, G.W., 1969, New formations on Kodiak and adjacent islands, Alaska, in Cohee, G.V., Bates, R.G., and Wright, W.B., Changes in stratigraphic nomenclature by the U.S. Geological Survey 1967: U.S. Geological Survey Bulletin 1274-A, p. A27-A35.
    KG004Clendenen, W.S., Sliter, W.V., and Byrne, Tim, 1992, Tectonic implications of the Albatross sedimentary sequence, Sitkinak Island, Alaska, in Bradley, D.C., and Ford, A.B., eds., Geologic studies in Alaska by the U.S. Geological Survey, 1990: U.S. Geological Survey Bulletin 1999, p. 52-70.
    KG006Moore, J.C., Byrne, Tim, Plumley, P.W., Reid, Mary, Gibbons, Helen, and Coe, R.S., 1983, Paleogene evolution of the Kodiak Islands, Alaska: Consequences of ridge-trench interaction in a more southerly latitude: Tectonics, v. 2, no. 3, p. 265-293.
    KR002Detterman, R.L., Case, J.E., Wilson, F.H., and Yount, M.E., 1987, Geologic map of the Ugashik, Bristol Bay, and western part of Karluk quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investgations Map I-1685, scale 1:250,000.
    KR003Detterman, R.L., Wilson, F.H., Yount, M.E., and Miller, T.P., 1987, Quaternary geologic map of the Ugashik, Bristol Bay and western part of Karluk quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1801, scale 1:250,000.
    KR004Wilson, F.H., Detterman, R.L., and DuBois, G.D., 1999, Digital data for the geologic framework of the Alaska Peninsula, southwest Alaska, and the Alaska Peninsula terrane: U.S. Geological Survey Open-File Report 99-317.
    KR006Connelley, 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.
    TI002Moore, G.W., 1967, Preliminary geologic map of Kodiak Island and vicinity, Alaska: U.S. Geological Survey Open-File Report 67-161 (271), 1 sheet, scale 1:250,000.
    TI003Moore, G.W., 1969, New formations on Kodiak and adjacent islands, Alaska, in Cohee, G.V., Bates, R.G., and Wright, W.B., Changes in stratigraphic nomenclature by the U.S. Geological Survey 1967: U.S. Geological Survey Bulletin 1274-A, p. A27-A35.
    TI004Clendenen, W.S., Sliter, W.V., and Byrne, Tim, 1992, Tectonic implications of the Albatross sedimentary sequence, Sitkinak Island, Alaska, in Bradley, D.C., and Ford, A.B., eds., Geologic studies in Alaska by the U.S. Geological Survey, 1990: U.S. Geological Survey Bulletin 1999, p. 52-70.
    TI005Moore, J.C., Byrne, Tim, Plumley, P.W., Reid, Mary, Gibbons, Helen, and Coe, R.S., 1983, Paleogene evolution of the Kodiak Islands, Alaska: Consequences of ridge-trench interaction in a more southerly latitude: Tectonics, v. 2., no. 3., p. 265-293.

    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
    15Glacier ice boundary
    50Dikes and sills
    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
    58Left lateral fault, concealed
    71Normal fault, location certain, having right lateral oblique slip
    73Normal fault, location certain, having left lateral oblique slip
    74Normal fault, location approximate, having left lateral oblique slip
    87Right lateral fault, location certain
    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 Scott Bie (USGS), F.H. Wilson (USGS), Keith Labay (contractor), 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 is 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 2005-1340

  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 14:04:40 2005