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
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.
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.
|Codeset Source:||Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/PIR2007-1_codeset.pdf>|
|backth_conceal?||trace of backthrust, concealed and queried|
|conceal||trace of concealed fault|
|conceal?||trace of concealed and queried fault|
|detach||trace of detachment surface|
|detach_conceal||trace of detachment surface, concealed|
|left_lat||trace of left-lateral fault|
|left_lat_apx||approximate trace of left-lateral fault|
|left_lat_con||trace of concealed left-lateral fault|
|normal||trace of normal fault, approximate|
|normal_certain||trace of a normal fault|
|right_lat_apx||approximate trace of right-lateral fault|
|right_lat_con||concealed trace of right-lateral fault|
|thrust||trace of thrust fault|
|thrust_apx||approximate trace of thrust fault|
|thrust_apx?||approximate trace of thrust fault, queried|
|thrust_apx_ot||approximate trace of overturned thrust fault|
|thrust_conc_ot||trace of concealed and overturned thrust fault|
|thrust_conceal||trace of concealed thrust fault|
|thrust_conceal?||trace of concealed thrust fault, queried|
|transverse||trace of a transverse fault, relative motion unknown|
|anticline||axial trace of anticline|
|dash||axial trace of fault, concealed or approximate|
|mono_n_steep||axis of steep north-dipping monocline|
|mono_s_steep||axis of steep south-dipping monocline|
|over_anti||axis of overturned anticline|
|over_syn||axis of overturned syncline|
|over_syn_apx||approximate axis of overturned syncline|
|plunge||arrow showing plunge of fold axis|
|syn_apx||approximate axial trace of syncline|
|syn_conceal||axial trace of concealed syncline|
|syncline||axial trace of syncline|
|infer||inferred geologic contacts other than Lisburne phosphate|
|Mlp_dash||outcrop trace of Lisburne phosphate, inferred|
05XXYY; 05=year, XX=Geologist's initials, YY=unique sample identifier.
|axial surface||axial surface of fold|
|Overturned Bedding||overturned bedding surface|
|Range of values|
|Range of values|
|Range of values|
|Range of values|
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
(907) 451-5029 (voice)
(907) 451-5050 (FAX)
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.
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.
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:.
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.
Data sources used in this process:
Data sources used in this process:
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.
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.
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.
Polygon topology is present on appropriate geospatial data; others are line or point data.
Are there legal restrictions on access or use of the data?
- 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).
- 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.
Preliminary Interpretative Report 2007-1
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|Data format:||PDF (version 1.6)|
|Data format:||ArcGIS Shapefile (version ESRI ArcGIS 9.x)|
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