Interpretive geologic bedrock map of the Tanana A-1 and A-2 quadrangles, central Alaska

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Frequently anticipated questions:


What does this data set describe?

Title:
Interpretive geologic bedrock map of the Tanana A-1 and A-2 quadrangles, central Alaska
Abstract:
Public Data File 98-37B v. 1.1, Interpretive geologic bedrock map of the Tanana A-1 and A-2 quadrangles, central Alaska, provides detailed (1:63,360-scale) geologic mapping of portions of U.S. Geological Survey Tanana A-1 and A-2 quadrangles. The map area is part of the Yukon-Tanana Upland physiographic province, the Manley Hot Springs-Tofty mining districts, and adjacent to the Rampart mining district to the south. This geologic map data release includes detailed geologic, structural, stratigraphic, and geochronologic information. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/1864.
Supplemental_Information:
This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Ekberg, P.G., Athey, J.E., Wyatt, W.C., Willingham, A.L., and Naibert, T.J., 2021, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170, 10 p. https://doi.org/10.14509/30669. The distribution package includes ESRI fonts and style files, along with usage instructions. Further documentation of the symbology is provided by Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 169, 7 p. https://doi.org/10.14509/30584
  1. How might this data set be cited?
    Reifenstuhl, R.R., Dover, J.H., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., and Weber, F.R., 1998, Interpretive geologic bedrock map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37B v. 1.1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 17 p., 1 sheet, scale 1:63,360
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -151.018782
    East_Bounding_Coordinate: -149.971866
    North_Bounding_Coordinate: 65.266529
    South_Bounding_Coordinate: 64.983307
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1997
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: geodatabase
  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: 0.999600
      Longitude_of_Central_Meridian: -153
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      Planar coordinates are specified in Meters
      The horizontal datum used is NAD27.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.40000000037.
      The flattening of the ellipsoid used is 1/294.978698199999997.
  7. How does the data set describe geographic features?
    tanana_a1_a2_quads_bedrock_ak_gems_db_pkg
    Geodatabase, layer files, style files, and fonts (Source: Alaska Division of Geological & Geophysical Surveys)
    tanana_a1_a2_quads_bedrock_gems_db_pkg
    Geodatabase, layer files, style files, and fonts (Source: Alaska Division of Geological & Geophysical Surveys)
    tanana_a1_a2_quads_bedrock_gems_shapefile_pkg
    Shapefiles and open data files (Source: Alaska Division of Geological & Geophysical Surveys)

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?
    Funding for the geologic mapping and geochronologic dating performed for this project was provided by the U.S. Geological Survey STATEMAP Program under award number 03HQAG0055 and by the Alaska State Legislature. Geologic map conversion to the GeMS standard was funded by the USGS National Cooperative Geologic Mapping Program under StateMap award number G20AC00367, 2020, and the State of Alaska General Fund. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.
  3. To whom should users address questions about the data?
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.

Why was the data set created?

The Tanana A-1 and A-2 Quadrangles lie between the villages of Rampart, on the Yukon River, and Manley Hot Springs, at the terminus of the Elliott Highway. At the time the report was published, the area towns were not part of any municipal or local governmental jurisdiction. The investigation of gold, tin, and other mineral occurrences in conjunction with comprehensive geologic mapping and recently-acquired geophysical data provide a scientific basis for expanded mineral exploration and development that can lead to the economic growth and the creation of new jobs needed by the Rampart-Manley-Tofty region's inhabitants and the State of Alaska. These objectives are consistent with the statewide goals and priorities articulated for the Department of Natural Resources by Alaska's Governor in his Executive Budget Summary for Fiscal Year 1997.

How was the data set created?

  1. From what previous works were the data drawn?
    Burns, L.E. and others, 2020 (source 1 of 8)
    Burns, L.E., Graham, G.R.C., Barefoot, J.D., Woods, Rebecca-Ellen, Dighem, Pritchard, R.A., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp., 2020, Rampart-Manley electromagnetic and magnetic airborne geophysical survey data compilation: Geophysical Report GPR 2020-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 13 p
    Type_of_Source_Media: paper
    Source_Contribution: Bedrock geologic mapping
    Eakin, H.M., 1912, p. 271-287 (source 2 of 8)
    Eakin, H.M., 1912, The Rampart and Hot Springs regions: Bulletin B 520, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: p. 271-287
    Type_of_Source_Media: paper
    Source_Contribution: Bedrock geologic mapping
    Eakin, H.M., 1913 (source 3 of 8)
    Eakin, H.M., 1913, A geologic reconnaissance of a part of the Rampart Quadrangle, Alaska: Bulletin B 535, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: 38 p., 2 sheets, scale 1:250,000
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: Bedrock geologic mapping
    Ekberg, P.G. and others, 2021 (source 4 of 8)
    Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Miscellaneous Publication MP 169, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 7 p
    Type_of_Source_Media: paper
    Source_Contribution: GIS analysis and digital cartography
    Hendricks, M.D. and others, 2021 (source 5 of 8)
    Hendricks, M.D., Ekberg, P.G., Athey, J.E., Wyatt, W.C., Willingham, A.L., and Naibert, T.J., 2021, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Miscellaneous Publication MP 170, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 10 p
    Type_of_Source_Media: paper
    Source_Contribution: GIS analysis and digital cartography
    Liss, S.A. and others, 1998 (source 6 of 8)
    Liss, S.A., Reifenstuhl, R.R., Clautice, K.H., Bundtzen, T.K., Newberry, R.J., Dover, J.H., and Blodgett, R.B., 1998, Rock geochemistry from the Manley mining district (Tanana A-1 and A-2 quadrangles with some samples from adjacent quadrangles): Public Data File PDF 98-39, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 41 p., 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Laboratory data compilation
    Yeend, Warren, 1990, p. 107-109 (source 7 of 8)
    Yeend, Warren, 1990, Gold placers, geomorphology, and paleo-drainage of Eureka Creek and Tofty areas, Alaska: Bulletin B 1946, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: p. 107-109
    Type_of_Source_Media: paper
    Source_Contribution: Bedrock geologic mapping
    U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 (source 8 of 8)
    U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps: Techniques and Methods TM 11-B10, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: 1 p
    Type_of_Source_Media: paper
    Source_Contribution: GIS analysis and digital cartography
  2. How were the data generated, processed, and modified?
    Date: 1997 (process 1 of 4)
    Bedrock geologic mapping - From June 16 and July 8, 1997, Alaska Divisions of Geological & Geophysical Surveys (DGGS) staff conducted field studies throughout the map area. Geologists observed details about the variations in texture, lithology, and orientation of the map units, collected rock samples, noted outcrop descriptions, and conducted structural measurements. Bedrock mappers recorded observations on 1:50,000 and 1:63,360-scale topographic base maps and field stations were located using hand held GPS units. Field observations were integrated with existing literature and geophysical survey data. Data sources used in this process:
    • Burns, L.E. and others, 2020
    • Eakin, H.M., 1912, p. 271-287
    • Eakin, H.M., 1913
    • Yeend, Warren, 1990, p. 107-109
    Date: 1998 (process 2 of 4)
    Laboratory data compilation - Selected samples were submitted for geochronologic and geochemical analysis. The results were used to further interpret the stratigraphic and structural history of the map area. Data sources used in this process:
    • Liss, S.A. and others, 1998
    Date: 1998 (process 3 of 4)
    Geologic map compilation - The geologic data were digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Contacts and other geologic features were determined visually using topographic maps at scales of 1:63,360 and 1:25,000, field station notes, and GPS location data. Geologic features were visually hand-plotted onto stable mylar bases from the field maps and then digitally compiled and plotted using ArcInfo software. The map and report received technical review and editing by several scientists familiar with the subject matter. The authors incorporated the reviewers' suggestions into the final draft when deemed appropriate.
    Date: 2021 (process 4 of 4)
    GIS analysis and digital cartography - This data distribution package's geologic and geographic features were organized and attributed according to the AK GeMS geologic mapping schema. The data were then programmatically transformed to provide download options in three formats: (1) an AK GeMS data package that includes the complete AK GeMS database and associated files, (2) a GeMS data package that is a conversion of the AK GeMS database into the base GeMS standard published by the USGS, and (3) a shapefile data package that includes two simple shapefile representations of the data. Data sources used in this process:
    • Ekberg, P.G. and others, 2021
    • Hendricks, M.D. and others, 2021
    • U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020
  3. What similar or related data should the user be aware of?
    Pinney, D.S., 1998, Derivative engineering geologic map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Pinney, D.S., 1998, Surficial geologic map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Reifenstuhl, R.R., Dover, J.H., Newberry, R.J., Clautice, K.H., Pinney, D.S., Liss, S.A., Blodgett, R.B., and Weber, F.R., 1998, Geologic map of the Tanana A-1 and A-2 quadrangles, central Alaska: Public Data File PDF 98-37A v. 1.1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 19 p., 1 sheet, scale 1:63,360

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

  1. How well have the observations been checked?
    This data release provides legacy geospatial data converted to the GeMS and AK GeMS specifications. Attribute fields within each feature class are populated using corresponding applicable values from the GeMS and AK GeMS specifications. When known, certainty in attribute interpretation is indicated in the relevant fields. Attribute accuracy varies throughout the map and is scale-dependent.
  2. How accurate are the geographic locations?
    This data release provides legacy geospatial data converted to the GeMS and AK GeMS specifications. To record the originating authors' degree of confidence in the location of features, the data include descriptive fields within each feature class and accompanying orientation and location confidence lookup tables. When location accuracy values are unavailable, users must infer positional accuracy based on standard geologic mapping practices of the investigation era. Field stations were located using hand-held GPS units, however for fieldwork conducted before 2000, Selective Availability limited location accuracy of the coordinates to roughly 100 meters. Certainty in feature boundaries or location varies throughout the map.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This publication is a DGGS Public Data File (PDF). The objective of the PDF series, published from 1983 through 1999, was to make project and field data available to the public as soon as possible. PDFs were not reviewed or edited.
  5. How consistent are the relationships among the observations, including topology?
    All polygon features were topologically validated according to specifications of the AK GeMS geologic mapping schema.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  1. Who distributes the data set? (Distributor 1 of 1)
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov
    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set? PDF 98-37B v. 1.1
  3. What legal disclaimers am I supposed to read?
    The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 15-Sep-2021
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov
Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.50 on Wed Sep 15 12:25:56 2021