kavik_units: geology polygons kavik_contacts: geologic contacts border: geologic map boundary kavik_faults: fault traces kavik_folds: axial trace of folds kavik_structure_data: strike and dip of bedding kavik_section_lines: cross section locations (cross sections are depicted in companion publication RI 2011-XB) kavik_Q_polygons: Quaternary geologic polygons kavik_Q_contact: Quaternary geologic contacts kavik_Q_structure: Quaternary moraines
Wartes, M.A., Wallace, W.K., Loveland, A.M., Gillis, R.J., Decker, P.L., Reifenstuhl, R.R., Delaney, P.R., LePain, D.L., and Carson, E.C., 2011, Geologic map of the Kavik River area, northeastern Brooks Range, Alaska: Report of Investigations RI 2011-3A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000001
Ordinates (y-coordinates) are specified to the nearest 0.000001
Planar coordinates are specified in meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.25722210088.
| Formal codeset | |
|---|---|
| Codeset Name: | Geologic Map of the Kavik River Area, northeastern Brooks Range, Alaska |
| Codeset Source: | This report |
Area represents the map area in square meters
| Value | Definition |
|---|---|
| seis_scl | sycline, derived from seismic interpretation |
| seis_acl | anticline, derived from seismic interpretation |
| scl_sl | syncline with steep limb, double arrow on steep limb |
| scl_minor | syncline, minor scale |
| scl_co | syncline, covered |
| scl_apx | syncline, approximately located |
| scl | syncline |
| ot_scl_sl | overturned syncline with a steep limb; double arrow on steep limb |
| ot_scl | overturned syncline |
| ot_acl_co | overturned anticline, covered |
| ot_acl | overturned anticline |
| mono_sl | monocline with steep limb; double arrow represents steep limb |
| mono_co | monocline, covered |
| acl_sl | anticline with steep limb; double arrow on steep limb |
| acl_minor | anticline, minor scale |
| acl_co | anticline, covered |
| acl | anticline |
| A_scl_sl | approximately located syncline with steep limb; double arrow on steep limb |
| A_acl_sl | approximately located anticline with steep limb; double arrow on steep limb |
| A_scl | approximately located syncline |
| A_mono_sl | approximately located monocline with steep limb; double arrow on steep limb |
| A_acl | approximately located anticline |
| Value | Definition |
|---|---|
| A_seis_thrust | approximately located thrust fault derived from seismic interpretation |
| A_thrust | approximately located thrust fault |
| A_transverse | approximately located transverse fault |
| thrust | thrust fault |
| transverse | transverse fault |
| Value | Definition |
|---|---|
| approx | approximately located contact |
| approx_q | approximately located, queried contact |
| covered | covered contact |
| NULL | contact (represented with solid line indicating high degree of certainty) |
| Value | Definition |
|---|---|
| Line W (EP-28) | Line W portion derived from seismic line EP-28 |
| Line C (ARCO80-06) | Line C portion derived from seismic line ARCO80-06 |
| Line E (EP-27) | Line E portion from seismic line EP-27 |
| Line W | surface section Line W |
| Line C | surface section Line C |
| Line E | surface section Line E |
| Formal codeset | |
|---|---|
| Codeset Name: | Geologic Map of the Kavik River Area, northeastern Brooks Range, Alaska |
| Codeset Source: | This report |
| Value | Definition |
|---|---|
| <Null> | All Quaternary contacts were taken from Carson, 2009 |
Geologist-defined value consisting of a 2-digit year, 2- or 3-digit geologist initials, and 3-digit station id number, except where the value is wkw_2010 (which indicates a 3-digit geologist initials and a 4-digit year
| Range of values | |
|---|---|
| Minimum: | 69.25037 |
| Maximum: | 69.65401 |
| Units: | decimal degrees |
| Resolution: | 0.00001 |
| Range of values | |
|---|---|
| Minimum: | -146.02820 |
| Maximum: | -146.99442 |
| Units: | decimal degrees |
| Resolution: | 0.00001 |
| Value | Definition |
|---|---|
| bedding | inclined bedding |
| bedding_horizontal | horizontal bedding |
| ot | overturned bedding |
| Range of values | |
|---|---|
| Minimum: | 3 |
| Maximum: | 347 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 3 |
| Maximum: | 89 |
| Units: | degrees |
| Value | Definition |
|---|---|
| ridge_crest | ridge crest, moraine |
| ridge_crest_queried | ridge crest/moraine, queried |
Geologic mapping was supported in part by the STATEMAP program under award number 06HQAG0024, administered by the U.S. Geological Survey.Additional funding was provided through a Capital Improvement grant from the State of Alaska.Field studies were also supported by a consortium of sponsors including Conoco Phillips, Anadarko, ENI, Petro-Canada, BG Alaska, FEX, Pioneer Natural Resources, and Shell.
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In recent years, interest in hydrocarbon exploration in the Brooks Range foothills has increased considerably, resulting in an opportunity to compile previous studies as well as to carry out additional field studies. Various topical studies and geological mapping in the Kavik River area by DGGS and collaborating agencies is an ongoing effort to address specific structural and stratigraphic problems along the northern foothills of the northeastern Brooks Range.
Bader, J.W., and Bird, K.J., 1986, Geologic map of the Demarcation Point, Mt. Michelson, Flaxman Island, and Barter Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Map I 1791.
Data sources used in this process:
Carson, E.C., 2009, Surficial-geologic map of the Kavik River area, west-central Mount Michelson Quadrangle, northeastern Brooks Range, Alaska: Report of Investigations RI 2009-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Geologic point, line, and polygon data were determined in the field or on air photos at a scale of approximately 1:63,360 and topographic maps at scales of 1:63,360 and larger. Feature attributes were checked by the geologists who conducted the field observations. To check attribute accuracy, a check plot was visually compared to the geologist's original map compilation. Discrepancies between the digital geospatial dataset and the original analog or digital compilation were corrected as needed. The geologic interpretations presented in this report have undergone two technical reviews by geologists familiar with the subject of the report or geology of the map area. Reviewers' suggestions were incorporated into the final draft when deemed appropriate by the author. All surficial-geologic contacts are represented by a solid line on the printed map. Surficial-geologic units were simplified from Carson, 2009, users should refer to the originating publication for additional information about the surficial-geology of this map area.
Locations were determined in the field using raster images of topographic base maps and Garmin GPS units. The estimated positional error calculated by the GPS unit was not recorded. Bedrock geologic map data also have a horizontal positional accuracy dependent on the "on-screen" method of digital cartography. Map error is induced by: (1) transferring map data from base topography to a mylar compilation map, with an estimated potential error due to a pen line width of approximately 0.001 inches being equivalent to approximately 1.5 meters on the ground; (2) the digitizing RMS error (30 control points on a regular grid have an average RMS error of 14.0 meters on the ground; individual control point error ranges from 2.9 to 24.0 meters on the ground); and (3) the accuracy of the human operator digitizing the geologic line work from the topographic base map, with an estimated error due to a pen line width of approximately 0.001 inches being equivalent to approximately 1.5 meters on the ground. The average potential horizontal error for bedrock geologic map features is estimated to be approximately 15 meters.
This dataset includes geospatial information about beds traceable on air photos and/or in the field. The dataset displays: geologic units and contacts; fold and fault traces; strike, dip, and fold axis attitude; man made infrastructure such as airstrips, roads, etc.; point elevations digitized from the raster map; and wells.Vector base map is from Carson, 2009.
Polygon topology is present and clean on the originating geospatial dataset. All polygon features were were topologically validated using the ESRI ArcGIS 9.2 software prior to export to shape file format. The logical consistency of the point and line files has been visually checked but not systematically verified.
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).
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907-451-5050 (FAX)
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| Data format: | SHP |
|---|---|
| Network links: |
<http://www.dggs.alaska.gov/pubs/id/22602> |
| Data format: | |
|---|---|
| Network links: |
<http://www.dggs.alaska.gov/pubs/id/22602> |
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