Geologic Map of the Siksikpuk River Area, Chandler Lake Quadrangle, Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title:
Geologic Map of the Siksikpuk River Area, Chandler Lake Quadrangle, Alaska
Abstract:
During 2004 and 2005 DGGS Energy Section geologists, together with University of Alaska Fairbanks and USGS personnel, conducted 1:63,360-scale geologic mapping in the Siksikpuk River Area of the Chandler Lake B-4 and C-4 quadrangles in northern Alaska. This work was conducted as part of the USGS-funded STATEMAP project, part of the National Cooperative Geologic Mapping Program.
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 geologic unit code set file "PIR2007-1_codeset.pdf". Layers include:
sik_beds_arc    beds traceable on air photos and/or in the field
sik_compgeo_polygon    geologic unit polygons
sik_contacts_arc    geologic contacts
sik_faults_arc    faults
sik_folds_arc    fold axial traces
sik_inferred_arc    inferred geologic contacts
sik_lisb_phos_arc    trace of Lisburne phosphate outcrop
XYplanar_edited_point    planar structure orientations
  1. How should this data set be cited?

    Peapples, P.R., Wallace, W.K., Wartes, M.A., Swenson, R.F., Mull, C.G., Dumoulin, J.A., Harris, E.E., Finzel, E.S., Reifenstuhl, R.R., and Loveland, A.M., 2007, Geologic Map of the Siksikpuk River Area, Chandler Lake Quadrangle, Alaska: Preliminary Interpretative Report PIR 2007-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -152.413134
    East_Bounding_Coordinate: -151.773068
    North_Bounding_Coordinate: 68.753186
    South_Bounding_Coordinate: 68.246753

  3. What does it look like?

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

    Calendar_Date: 2007
    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?

    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: -153.000
      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 0.000032
      Ordinates (y-coordinates) are specified to the nearest 0.000032
      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 6378206.4.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    sik_beds_arc.shp
    Object type is vector, there are 21 rows associated with this entity, and the entity values refer to traceable beds. (Source: Alaska Division of Geological & Geophysical Surveys)

    sik_compgeo_polygon.shp
    Object type is vector, there are 992 rows associated with this entity, and the entity values refer to the unit name abbreviations for each specific polygon represented on the map. (Source: Alaska Division of Geological & Geophysical Surveys)

    unit
    A unique three to four letter abbreviation given to each map unit represented on the map. (Source: Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:PIR2007-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/PIR2007-1_codeset.pdf>

    sik_contacts_arc.shp
    Object type is vector, there are 930 rows associated with this entity, and the entity values refer to to geologic map unit contacts. (Source: Alaska Division of Geological & Geophysical Surveys)

    sik_faults_arc.shp
    Object type is vector, there are 161 rows associated with this entity, and the entity values refer to various faults in the mapping area. (Source: Alaska Division of Geological & Geophysical Surveys)

    type
    Type of fault. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    backth_conceal?trace of backthrust, concealed and queried
    concealtrace of concealed fault
    conceal?trace of concealed and queried fault
    detachtrace of detachment surface
    detach_concealtrace of detachment surface, concealed
    left_lattrace of left-lateral fault
    left_lat_apxapproximate trace of left-lateral fault
    left_lat_contrace of concealed left-lateral fault
    normaltrace of normal fault, approximate
    normal_certaintrace of a normal fault
    right_lat_apxapproximate trace of right-lateral fault
    right_lat_conconcealed trace of right-lateral fault
    thrusttrace of thrust fault
    thrust_apxapproximate trace of thrust fault
    thrust_apx?approximate trace of thrust fault, queried
    thrust_apx_otapproximate trace of overturned thrust fault
    thrust_conc_ottrace of concealed and overturned thrust fault
    thrust_concealtrace of concealed thrust fault
    thrust_conceal?trace of concealed thrust fault, queried
    transversetrace of a transverse fault, relative motion unknown

    sik_folds_arc.shp
    Object type is vector, there are 74 rows associated with this entity, and the entity values refer to fold axial traces. (Source: Alaska Division of Geological & Geophysical Surveys)

    type
    Type of fold. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    anticlineaxial trace of anticline
    dashaxial trace of fault, concealed or approximate
    mono_n_steepaxis of steep north-dipping monocline
    mono_s_steepaxis of steep south-dipping monocline
    over_antiaxis of overturned anticline
    over_synaxis of overturned syncline
    over_syn_apxapproximate axis of overturned syncline
    plungearrow showing plunge of fold axis
    syn_apxapproximate axial trace of syncline
    syn_concealaxial trace of concealed syncline
    synclineaxial trace of syncline

    sik_inferred_arc.shp
    Object type is vector, there are 10 rows associated with this entity, and the entity values refer to inferred geologic contacts. (Source: Alaska Division of Geological & Geophysical Surveys)

    type
    Type of contact. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    inferinferred geologic contacts other than Lisburne phosphate
    Mlp_dashoutcrop trace of Lisburne phosphate, inferred

    sik_lisb_phos_arc.shp
    Object type is vector, there are 16 rows associated with this entity, and the entity values refer to the trace of the Lisburne phosphate outcrop. (Source: Alaska Division of Geological & Geophysical Surveys)

    XYplanar_edited_point.shp
    Object type is point, there are 792 rows associated with this entity, and the entity values refer to planar structure orientations. (Source: Alaska Division of Geological & Geophysical Surveys)

    station_id
    Unique number assigned to each station. (Source: Alaska Division of Geological & Geophysical Surveys)

    05XXYY; 05=year, XX=Geologist's initials, YY=unique sample identifier.

    planar_structure_type
    planar structure type, such as bedding or cleavage, requiring different geologic symbols (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    axial surfaceaxial surface of fold
    Beddingbedding surface
    cleavagecleavage plane
    faultfault surface
    Fissilityfissility orientation
    FOLIATIONfoliation surface
    jointjoint surface
    Overturned Beddingoverturned bedding surface

    map_utm_ea
    Easting coordinate in UTM (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:505729.3211
    Maximum:581593.512
    Units:meters

    map_utm_no
    Northing coordinate in UTM (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:7570112.127
    Maximum:7684537.482
    Units:meters

    strike_azimuth
    Strike of structure orientations. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1
    Maximum:360
    Units:degrees

    dip_rhr
    Represents the dip angles used to produce the dip directions. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:90
    Units:degrees

    type_
    Type of surface. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    horizhorizontal surface
    inclinedinclined surface
    vertvertical surface
    verticalvertical surface


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 Geologic Map was funded in part by the United States Geological Survey National Cooperative Geologic Mapping Program under assistance award numbers 04HQAG0061 and 05HQAG0025. 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 United States Government. Additional support from the DGGS NPRA Foothills Research Program made this mapping project possible. We appreciate the generous contributions of Anita Harris, United States Geological Survey, retired, for providing conodont ages. Dave Houseknecht, United States Geological Survey and Mike McDonough, Encana, provided valuable interpretive input and discussion. Many thanks to our technical reviewers, Dave LePain and Ken Bird. Andrea Loveland cheerfully assisted as our STATEMAP intern and vectorized the map topography. DeAnne Stevens provided guidance during the air photo interpretation and orthorectification processes. Gates of the Arctic National Park access was permitted through the Alaska Mineral Resource Assessment Program under the Alaska National Interest Lands Conservation Act. Geologic field investigations by: P.R. Peapples1 (20032005); W.K. Wallace2 (20012005); E.E. Harris3 (1985, 19992000, 20-02-2004); C.G. Mull4 (19841985, 1989, 19992005); D. L. LePain1 (19982003); J.A. Dumoulin5 (20022005); M.A. Wartes1 (20012005); E.S. Finzel1 (20022005); R.R. Reifenstuhl1 (20032005); A.M. Loveland1 (20042005); R.F. Swenson1 (20042005); P.L. Decker6 (20042005); K.H. Clautice1 (2005); M.T. Whalen2 (20022004); A.S. Duncan2 (20042005); P.J. McCarthy2 (20012002); D.A. Bodnar2 (1983); K.E. Adams2 (19841985). Technical review by: D.L. LePain1, K.J. Bird7 Digital Cartography by: P.R. Peapples1 Edited by: Paula K. Davis1 1 Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK 2 Department of Geology & Geophysics, University of Alaska Fairbanks, Fairbanks, AK 3Geologist, Ignacio, CO 4Petroleum Geologist, Santa Fe, NM 5 US Geological Survey, Anchorage, AK 6Alaska Division of Oil and Gas, Anchorage, AK 7US Geological Survey, Menlo Park, CA

  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?

This portion of the northern Brooks Range foothills is thought to be strategic for natural gas in particular, and is currently under lease to both major and smaller independent petroleum exploration companies. New mapping in this area provides an opportunity to study, in outcrop, the stratigraphy and structural styles of the source and reservoir rocks that enrich the Colville basin to the north. The mapping extends structural and stratigraphic models developed during previous mapping along the foothills to the west, providing baseline geologic data to the private and public entities that identify, develop, and manage resources that area.


How was the data set created?

  1. From what previous works were the data drawn?

    Kelley, 1990 (source 1 of 2)
    Kelley, J.S., 1990, Generalized geologic map of the Chandler Lake Quadrangle, north-central Alaska: U.S. Geological Survey Miscellaneous field studies map MF 2144-A, United States Government Printing Office, Washington D.C., USA.

    Online Links:

    Other_Citation_Details: 19 p., 1 sheet, scale 1:250,000
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: This publication provides a regional map of the area.

    Mull and others, 1987 (source 2 of 2)
    Mull, C.G., Crowder, R.K., Adams, K.E., Siok, J.P., Bodnar, D.A., Harris, E.E., Alexander, R.A., and Solie, D.N., 1987, Stratigraphy and structural setting of the picnic creek allochthon, Killik River Quadrangle, central Brooks Range, Alaska:.

    Other_Citation_Details: p. 649-662
    This is part of the following larger work.

    Tailleur, I. (ed.), and Weimer, P. (ed.), 1987, Alaskan North Slope Geology: none v. 50, Society of Economic Paleontologists and Mineralogists, Pacific Section, Bakersfield, California - USA.

    Type_of_Source_Media: paper
    Source_Contribution: This publication provided aid in the geologic mapping process.

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

    Date: 1998 (process 1 of 2)
    Fieldwork - Geologic mapping took place during three-week field seasons during June-July 2004 and 2005. Mappers recorded observations in field notebooks and on the aerial photographs and topographic maps, predominantly at 1:63,360 scale. Bedrock mapping involved using aerial photographs and topographic maps on a daily basis for checking geologic contacts and units. All compilations were made by hand on stable mylar at 1:63,360 scale. Stations were located using aerial photographs, topographic maps, and altimeters. In most instances, GPS devices were used. Stations were also plotted by hand on stable mylar topographic bases and coordinates determined by digitizing.

    Data sources used in this process:

    • Kelley, 1990
    • Mull and others, 1987

    Date: 2000 (process 2 of 2)
    Geologic map compilation - The bedrock geologic map was compiled using field notes from fieldwork process step (above), and all known geologic data from previous work in the quadrangle. Data were compiled on multiple layers of stable mylar at 1:63,360 scale. Relevant information from all mylar layers was compiled onto one stable mylar sheet with abundant control points. This mylar was then scanned and digitized.

    Data sources used in this process:

    • Kelley, 1990
    • Mull and others, 1987

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


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

  1. How well have the observations been checked?

    Geologic point, line, and polygon data were determined visually using color infrared aerial photographs at a scale of approximately 1:63,360 and topographic maps at scales of 1:63,360 and larger. The geospatial data included in this project are digitized from a Mylar compilation of geologic field information produced on USGS topographic base maps of the area. AAAGES font was used to display geologic age symbols. Geologic data included in the compilation are the field maps and notes from this project. Feature attributes were checked by the geologists who made the field observations. To check attribute accuracy, a check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog or digital compilation were corrected as needed.

  2. How accurate are the geographic locations?

    Locations were determined in the field using raster images of topographic base maps and Garmin GPS units. Data were mapped directly on scale-stable copies of the topographic base maps and digitized using heads-up monitor display and a mouse. Point data were plotted directly from the GPS data. Most digitized positions on the map are estimated to have better than 5 m horizontal accuracy.

  3. How accurate are the heights or depths?

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

    This dataset includes geospatial information about beds traceable on air photos and/or in the field, geologic units and contacts, fold and fault traces, strike, dip, and fold axis attitude, the trace of the Lisburne phosphate outcrop, and planar structure orientations.

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

    Polygon topology is present on appropriate geospatial data; others are line or point data.


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
    Natural Resource Technician
    3354 College Road
    Fairbanks, AK 99709-3707
    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 web site (<http://www.dggs.dnr.state.ak.us>) 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?

    Preliminary Interpretative Report 2007-1

  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: 04-Apr-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 14:29:36 2008