chu_allsrfgeo_arc surficial geologic unit boundaries (arc) chu_allsrfgeo_polygon surficial geologic units (polygon) chu_linears_arc engineering geologic lineaments chu_mat_arc engineering geologic unit boundaries (arc) chu_mat_polygon engineering geologic units (polygon) chu_sackung_arc engineering sackung boundaries (arc) chu_sackung_polygon engineering sackung (polygon)
Pinney, D.S., 2001, Engineering-geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1D, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.Online Links:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000128
Ordinates (y-coordinates) are specified to the nearest 0.000128
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 6378206.4.
The flattening of the ellipsoid used is 1/294.978698.
| Value | Definition |
|---|---|
| 2 | Contact |
| Value | Definition |
|---|---|
| BC | Undifferentiated stream alluvium |
| BG | Abandoned-channel deposits |
| BH | Alluvial fan deposits |
| BM | Terrace alluvium |
| BO | Floodplain alluvium |
| BV | Undifferentiated colluvium |
| GM | Landslide deposits |
| GS | Talus and rubble deposits |
| ICE | Rock-glacier deposits |
| LK | Swamp deposits |
| OR | Outwash alluvium |
| Range of values | |
|---|---|
| Minimum: | 347180.738727893 |
| Maximum: | 393357.430803173 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 6984634.47212448 |
| Maximum: | 7021282.57866416 |
| Units: | meters |
| Value | Definition |
|---|---|
| 6 | Contact, approximately located |
| Value | Definition |
|---|---|
| b | Undifferentiated bedrock |
| bc | Thinly covered bedrock |
| lake | Lake |
| glacier | Glacier |
| Formal codeset | |
|---|---|
| Codeset Name: | RI2001-1_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI2001-1_codeset.pdf> |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 393398.2 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 7021089 |
| Units: | meters |
| Value | Definition |
|---|---|
| b | Undifferentiated bedrock |
| bc | Thinly covered bedrock |
| lake | Lake |
| glacier | Glacier |
| Formal codeset | |
|---|---|
| Codeset Name: | RI2001-1_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI2001-1_codeset.pdf> |
| Value | Definition |
|---|---|
| S | Surficial deposit |
| B | Bedrock deposit, including exposed and thinly-covered units |
| Value | Definition |
|---|---|
| BX | Undifferentiated bedrock and thinly covered bedrock |
| lake | Lake |
| glacier | Glacier |
| Formal codeset | |
|---|---|
| Codeset Name: | RI2001-1_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI2001-1_codeset.pdf> |
The Chulitna project is part of DGGS's Airborne Geophysical and Geological Mineral Inventory project (AGGMI), a special multi-year investment by the State of Alaska to produce framework geologic maps that will expand the knowledge base of Alaska's geologic and mineral resources, catalyze future private-sector mineral exploration and development, and guide government agencies' planning projects. The AGGMI project is funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the Chulitna project was also provided by the U.S. Geological Survey under U.S. Department of the Interior, U.S. Geological Survey, National Cooperative Geological Survey STATEMAP Cooperative Agreement 98HQAG2083. 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.
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The purpose of this project was to produce a 1:63,360-scale geologic map for the airborne geophysical surveys released by DGGS in the Chulitna region during 1996. The geologic data are important for identifying potential mineral deposits and for characterizing and distinguishing between geologic units.
Clautice, K.H., Newberry, R.J., Pinney, D.S., Blodgett, R.B., Bundtzen, T.K., Gage, B.G., Harris, E.E., Liss, S.A., Miller, M.L., Reifenstuhl, R.R., and Clough, J.G., 2001, Geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Wagner, A.A., 1957, The use of the Unified Soil Classification System by the Bureau of Reclamation: Proceedings, 4th International Conference on Soil Mechanics and Foundation Engineering volume I, p. 125, International Conference on Soil Mechanics and Foundation Engineering, London, England.
Data sources used in this process:
Gage, B.G., Liss, S.A., and Clautice, K.H., 199810, Preliminary geochemical and major oxide data: Chulitna project, Healy A-6 Quadrangle and nearby areas (1997 and 1998): Public Data File PDF 1998-36, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Blodgett, R.B., and Clautice, K.H., 2000, Fossil locality map for the Healy A-6 Quadrangle, southcentral Alaska: Report of Investigation RI 2000-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Clautice, K.H., Newberry, R.J., Blodgett, R.B., Bundtzen, T.K., Gage, B.G., Harris, E.E., Liss, S.A., Miller, M.L., Reifenstuhl, R.R., Clough, J.G., and Pinney, D.S., 200112, Bedrock geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Clautice, K.H., Newberry, R.J., Pinney, D.S., Blodgett, R.B., Bundtzen, T.K., Gage, B.G., Harris, E.E., Liss, S.A., Miller, M.L., Reifenstuhl, R.R., and Clough, J.G., 2001, Geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Pinney, D.S., 200105, Surficial-geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Burns, L.E., Dighem, and WGM Mining and Geological Consultants, 1997, CD-ROM digital archive files of 1996 survey data for Chulitna and Petersville mining districts, Alaska: Public Data File PDF 1997-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Pritchard, R.A., and Dighem, 1997, Project report of the airborne geophysical survey for the Chulitna and Petersville mining districts, Alaska: Public Data File PDF 1997-8, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Burns, L.E., 1997, Portfolio of aeromagnetic and resistivity maps of the Chulitna mining district: Public Data File PDF 1997-7, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Geologic point, line, and polygon data were determined in the field using 1:63,360-scale topographic maps and 1:50,000 (nominal) scale, color-infrared aerial photographs. The surficial-geologic information was transferred from acetate air-photo overlays to a paper 1:63,360-scale USGS topographic base using a zoom transfer scope. The surficial-geologic information was then digitized into Arc/Info GIS (ArcEdit module) using a large-format digitizing table with RMS registration errors constrained to be no larger than 0.003 inches (input coverage units) for each digitizing session. 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.
Bedrock location data were determined visually using topographic maps at scales of 1:63,360 and larger. Altimeters were also used. Occasional use was made of hand-held GPS, but Selective Availability, a random 100-meter error assigned to GPS signals by the U.S. government, was in place at the time. Geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps. The coordinates of sample and station locations were entered into an Excel spreadsheet with a digitizing tablet. Station notes and sample descriptions were entered into an Excel spreadsheet. The lists of samples were visually checked against the lists of analyzed samples returned from the laboratories. It was verified that all the samples plotted on the maps are included in the various tables and spreadsheets. Surficial location data were determined visually using topographic maps at a scale of 1:63,360 and 1:50,000 (nominal) scale, color-infrared aerial photographs.
This dataset includes geospatial information about engineering-geologic features.
Polygon topology present and clean on appropriate data; others are line or point data.
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.
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Report of Investigation 2001-1D
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| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/3313> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/3313> |
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