Reconnaissance engineering-geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska

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

Frequently-anticipated questions:


What does this data set describe?

Title:
Reconnaissance engineering-geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska
Abstract:
Alaska Division of Geological & Geophysical Surveys (DGGS) has conducted 1:63,360-scale geologic mapping of the Sagavanirktok B-1 Quadrangle (640 square km—equivalent to four 7.5 minute quadrangles). This mapping project reinterprets micropaleontologic correlations for 17 Sagavanirktok Quadrangle wells, and reprocesses data from the one publicly-available seismic line. Surface geologic mapping, subsurface-to-surface stratigraphic age control, and seismic framework are required to reliably decipher the complex geology of this key area of the Brooks Range. Outcrops within the Sagavanirktok B-1 Quadrangle are the closest surface expressions of Prudhoe Bay source and reservoir rocks. This study yields critical petroleum-related information from these surface exposures, and how they relate to the area subsurface stratigraphy.
Supplemental_Information:
The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the "Entity_and_Attribute_Information" section. Layers include:
anwr_arc     boundary of the Arctic National Wildlife Refuge
sagmat_polygon     engineering geologic units
  1. How should this data set be cited?

    Pinney, D.S., 2000, Reconnaissance engineering-geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1D, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: 2 p., 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -147.606990
    East_Bounding_Coordinate: -147.000000
    North_Bounding_Coordinate: 69.501031
    South_Bounding_Coordinate: 69.248958

  3. What does it look like?

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

    Beginning_Date: 1999
    Ending_Date: 2000
    Currentness_Reference: publication date

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

    Geospatial_Data_Presentation_Form: report, map, vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the 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: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -147.000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000255
      Ordinates (y-coordinates) are specified to the nearest 0.000255
      Planar coordinates are specified in meters

      The horizontal datum used is D_Clarke_1866.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    anwr_arc.shp
    Object type is vector, there are no attributes associated with this entity, and the entity refers to the border of the Arctic National Wildlife Refuge (Source: Alaska Division of Geological & Geophysical Surveys)

    sagmat_polygon.shp
    Object type is vector, there are 332 rows associated with this entity, and the entity refers to engineering geologic units (Source: Alaska Division of Geological & Geophysical Surveys)

    MAT
    engineering geologic unit labels (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    BCMedium-jointed, fine- to coarse-grained sedimentary carbonate rocks. Includes limestone, and dolostone.
    BMMedium-jointed, fine- to medium-grained quartzose sedimentary rocks. Includes quartzose sandstone and conglomerate, quartzite, and chert.
    BORocks of mixed lithology and very fine-grained sedimentary lithologies that are generally poorly suited for use as construction materials. Includes shale, siltstone, graywacke and argillite.
    GMPoorly- to moderately well-sorted clay, silt, sand, gravel, and diamicton of colluvial, fluvial and glacial origins. Includes angular, unsorted talus debris and chaotically deformed colluvium derived from landslides.
    GSFluvial and glaciofluvial gravel, sand, and silt. Chiefly (estimated >80 percent) clean sand and gravel. Grain size, sorting and degree of stratification are variable. Permafrost may be present, especially in older deposits.
    NAInterpretation not available, region covered by a body of water (lake)
    OROrganic-rich silt and peat in bogs and thaw lake basins. Commonly frozen and ice-rich due to the excellent insulating properties of peat. Generally water-saturated. Chiefly organic materials. Estimated >50 percent peat, organic sand, or organic silt.
    SMSilt deposited primarily by wind and reworked by fluvial and colluvial processes. May be organic rich. Commonly frozen and ice-rich, especially on north-facing slopes. Chiefly fine materials. Estimated >80 percent silt, sand, and clay.

    X-COORD
    Longitude (UTM) of sample location (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:476390.64978314
    Maximum:499947.68018756
    Units:meters

    Y-COORD
    Latitude (UTM) of sample location (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:7682130.22648194
    Maximum:7709886.82396563
    Units:meters


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 was provided by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP award number 99HQAG0121 under the NCGM STATEMAP program for FY1999. 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. Additional Acknowledgments: Map reviewed by R.F. Swenson and M.T. Whalen. Electronic cartography by A.G. Sturmann and B.G. Gage.

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    GIS Data Manager/Cartographer
    3354 College Road
    Fairbanks, AK 99709-3707

    (907) 451-5029 (voice)
    (907) 451-5050 (FAX)
    dggspubs@alaska.gov

    Contact_Instructions:
    You may view our web site at <http://www.dggs.dnr.state.ak.us> for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.


Why was the data set created?

At the time this project was published, the State of Alaska depended on the petroleum industry for approximately 80 percent of its revenue, most of which comes from oil fields on the North Slope. North Slope oil production is declining. This mapping project addresses this problem by providing the state and industry with the first published geologic map of this part of the North Slope oil province at a scale other than 1:2,500,000. Detailed geologic mapping of the quadrangle addresses the lack of understanding of the petroleum-geology framework of the eastern North Slope, Colville basin, and the stratigraphic transition from the National Petroleum Reserve in Alaska (NPRA) to the Arctic National Wildlife Refuge (ANWR). This detailed mapping and petroleum-related data is pertinent to oil exploration for Prudhoe Bay satellite fields and new play-type reevaluations, as well as assist private-sector exploration efforts, and speed the exploration process. This data will contribute to increased confidence in exploration and evaluation efforts in areas west of Prudhoe Bay.


How was the data set created?

  1. From what previous works were the data drawn?

    Ashley and others (1984) (source 1 of 8)
    Ashley, G.M., Hamilton, T.D., and Reed, K.M., 1984, Epiguruk bluff—Chronology and regional correlations: Geological Society of America Abstracts with Programs v. 16, Geological Society of America, Boulder, CO, USA.

    Other_Citation_Details: p. 267
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Detterman (1953) (source 2 of 8)
    Detterman, R.L., 1953, Sagavanirktok–Anaktuvuk region, northern Alaska:.

    This is part of the following larger work.

    Péwé, T.L. (ed.), Muller, E.H. (ed.), Karlstrom, T.N.V. (ed.), Krinsley, D.B. (ed.), Fernald, A.T. (ed.), Wahrhaftig, C. (ed.), Hopkins, D.M. (ed.), and Detterman, R.L. (ed.), 1953, Multiple glaciation in Alaska: Circular Circ. 289, U.S. Geological Survey, Washington, DC, USA.

    Other_Citation_Details: p. 11-12
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Detterman and others (1958) (source 3 of 8)
    Detterman, R.L., Bowsher, A.L., and Dutro, J.T., Jr., 1958, Glaciation on the Arctic Slope of the Brooks Range, northern Alaska: Journal of the Arctic Institute of North America v. 11, Arctic, Calgary, Alberta, Canada.

    Other_Citation_Details: p. 43-61
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Hamilton (1986) (source 4 of 8)
    Hamilton, T.D., 1986, Late Cenozoic glaciation of the central Brooks Range:.

    This is part of the following larger work.

    Hamilton, T.D. (ed.), Reed, K.M. (ed.), and Thorson, R.M. (ed.), 1986, Glaciation in Alaska: The geologic record: None None, Alaska Geological Society, Anchorage, AK, USA.

    Other_Citation_Details: p. 9-49
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Ashley and others (1982) (source 5 of 8)
    Hamilton, T.D., 1982, A late Pleistocene glacial chronology for the southern Brooks Range—Stratigraphic record and regional significance: Geological Society of America Bulletin Bulletin 93, U.S. Geological Survey, Reston, VA, USA.

    Other_Citation_Details: p. 700-716
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Porter and others (1983) (source 6 of 8)
    Porter, S.C., Pierce, K.L., and Hamilton, T.D., 1983, Late Wisconsin mountain glaciation in the western United States:.

    This is part of the following larger work.

    Porter, S.C., and Wright, H.E., Jr. (ed.), 1983, The Late Pleistocene: Late Quaternary Environments of the United States v. 1, University of Minnesota Press, Minneapolis, MN, USA.

    Other_Citation_Details: p. 71-111 of 407
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Waythomas (1991) (source 7 of 8)
    Waythomas, C.F., 1991, Surficial geologic map of the Sagavanirktok B-1 Quadrangle, northeastern Brooks Range, Alaska: Public Data File PDF 91-21E, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360, 5 p.
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Wagner (1957) (source 8 of 8)
    Wagner, A.A., 1957, The use of the Unified Soil Classification System by the Bureau of Reclamation: Proceedings v. I, 4th International Conference on Soil Mechanics and Foundation Engineering, London, England.

    Online Links:

    • NONE

    Other_Citation_Details: p. 125
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

  2. How were the data generated, processed, and modified?

    Date: 1999 (process 1 of 4)
    Fieldwork - Fieldwork for surficial/engineering geologic investigations, including ridge and valley traverses, road cut investigations, and river exposures, was conducted for approximately 5 person-days during June 21-25, 1999 by a surficial geologist. Field notes and sediment samples were collected throughout the area for surficial investigations. Surficial mapping involved using sources cited below on a regular basis for checking and correlating general units. The surficial mapper recorded observations on co-registered acetate overlays on 1:50,000-scale (nominal) color-infrared aerial photographs (Alaska High Altitude Aerial Photography, 1978, 1982), and directly on 1:63,360-scale topographic base maps. Stations were located using air photos and topographic maps.

    Data sources used in this process:

    • Ashley and others (1984)
    • Detterman (1953)
    • Detterman and others (1958)
    • Hamilton (1986)
    • Hamilton (1982)
    • Porter and others (1983)
    • Waythomas (1991)

    Date: 1999 (process 2 of 4)
    Laboratory data - See the report RI 2000-1D for more information.

    Date: 1999 (process 3 of 4)
    Photo interpretation - Before, during, and after field work, surficial/engineering geologic information was interpreted using 1:50,000-scale (nominal) color-infrared air-photo stereopairs, and compiled onto acetate overlays. Photo interpretation was based on field notes from fieldwork process step (above), observed land forms and relationships in the photos, and all known geologic data from previous work in the area. The main sources of existing data include the references listed below. The overlay information was transferred to a paper 1:63,360-scale USGS topographic base using a zoom transfer scope.

    Data sources used in this process:

    • Ashley and others (1984)
    • Detterman (1953)
    • Detterman and others (1958)
    • Hamilton (1986)
    • Hamilton (1982)
    • Porter and others (1983)
    • Waythomas (1991)

    Date: 2000 (process 4 of 4)
    Digital Cartography - Surficial/engineering geologic information was digitized from the paper USGS topographic base map into Arc/Info 7.0.4 GIS (ArcEdit module) using a large-format digitizing table. Surficial/engineering geologic polygons and lines were then edited and attributed using Arc, Info, and ArcEdit. Other cartographic elements, primarily text and tables, were created in CorelDraw, converted to CGM format, and imported into ArcPlot for final layout. Data from the comprehensive geologic map of the area were used as the basis for generating the derivative engineering-geologic map. An ArcInfo lookup table was made to assign geologic units (item UNIT) from the comprehensive map to appropriate engineering-geologic units (item MAT) based on the Unified Soil Classification System as described by Wagner (1957). This lookup table was applied to the ArcInfo polygon coverage containing the geologic units and a new engineering-geologic polygon coverage was generated using the "dissolve" command based on the new materials-unit item "MAT." Additional features were mapped from ground observations and interpretation of air photos, and digitized and attributed using ArcInfo. ArcPlot was used to generate plot files of the resulting materials coverage using DGGS-standard symbology.

    Data sources used in this process:

    • Wagner (1957)

  3. What similar or related data should the user be aware of?

    Reifenstuhl, R.R., Mull, C.G., Harris, E.E., LePain, D.L., Pinney, D.S., and Wallace, W.K., 2000, Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: 15 p., 1 sheet, scale 1:63,360
    Reifenstuhl, R.R., Mull, C.G., Harris, E.E., LePain, D.L., Wallace, W.K., and Pinney, D.S., 2000, Interpretive bedrock geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: Scale 1:63,360
    Pinney, D.S., 2000, Reconnaissance surficial-geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: Scale 1:63,360


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

  1. How well have the observations been checked?

    Location data for geologic point coverages were entered manually from GPS units into a spreadsheet. Data for surficial and materials point, line, and polygon coverages were determined in the field using 1:63,360-scale topographic maps and 1:50,000 (nominal) scale, color-infrared aerial photographs. Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section. Attributes were verified for consistency and completeness during the creation of the metadata.

  2. How accurate are the geographic locations?

    DGGS location data and estimated position errors were manually entered into a spreadsheet. Sample numbers and locations with selected data were spatially registered and analyzed in ArcGIS software. Location data for the surficial and materials maps were determined visually using topographic maps at a scale of 1:63,360 and 1:50,000 (nominal) scale, color-infrared aerial photographs. See "Source_Information" section for horizontal positional accuracy of locations not measured by DGGS.

  3. How accurate are the heights or depths?

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

    This dataset includes coverages that contain information about engineering-geologic units, and field sample locations at 1:63,360 scale.

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

    Topology is present on appropriate polygon and line coverages; others are point coverages.


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 are 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. 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.

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    GIS Data Manager/Cartographer
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907) 451-5020 (voice)
    (907) 451-5050 (FAX)
    dggspubs@alaska.gov

    Contact_Instructions:
    You may view our web site at <http://www.dggs.dnr.state.ak.us> for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.
  2. What's the catalog number I need to order this data set?

    Report of Investigation 2000-1D

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.


Who wrote the metadata?

Dates:
Last modified: 06-May-2008
Last Reviewed: 06-May-2008
To be reviewed: 25-May-2009
Metadata author:
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5039 (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 contact us through the e-mail address above whenever possible.
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.6 on Tue May 06 14:29:39 2008