chu_allsrfgeo_arc surficial geologic unit boundaries (arc) chu_allsrfgeo_polygon surficial geologic units (polygon) chubedcomp_arc bedrock geologic unit boundaries (arc) chubedcomp_polygon bedrock geologic units (polygon) chucompstrsym_point points for the strike, dip, and plunge of bedding planes, foliation, and various lineaments chudikecomp_arc vector lines for dikes of undifferentiated composition chufoldcomp_arc types of folds, anticlines, synclines, or lines depicting a cross-section chufoldcomp_point fold, anticline, syncline, or cross-section symbols chuhflscomp_arc hornfels unit boundaries (arc) chuhflscomp_polygon hornfels units (polygon) chusample_point point data indicating the location of felsic dikes chustructcomp_arc vector lines for types of faults
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 - 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 |
|---|---|
| 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> |
| Value | Definition |
|---|---|
| 0 | Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 4 | Bounding box |
| 7 | Contact inferred |
| 11 | Fault |
| 12 | ***Note: the polygon having the software-defined attribute/column FID whose value is 318 should have a value of "11", corresponding to a line depicting a fault.*** |
| 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 |
|---|---|
| 0 | hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| Value | Definition |
|---|---|
| Amh1 | Region associated with the unit "sp*", serpentinite near the surface, and is interpreted from aeromagnetic signatures |
| HFLS | Hornfels are very dark gray to black, very fine to fine grained, hard, dense rocks with common disoriented crystals or rosettes of muscovite, biotite, and locally andalusite. Typically formed by contact metamorphism. |
| 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 |
|---|---|
| 0 | hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 5 | contact |
| 7 | contact, inferred |
| Value | Definition |
|---|---|
| 11 | fault |
| 13 | inferred fault |
| 19 | thrust fault, sawteeth on upper plate, user will need to see the Geologic Map of the Chulitna Region, Southcentral Alaska (Publication RI 2001-1A) for interpretation of relative plate motion |
| 23 | inferred thrust fault |
| Value | Definition |
|---|---|
| 0 | hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
Value assigned 1-782
Unique sample number designated by the author(s).
| Range of values | |
|---|---|
| Minimum: | -150.02588 |
| Maximum: | -149.11703 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 62.96763 |
| Maximum: | 63.28582 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 6 |
| Maximum: | 90 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 359 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | 360 |
| Units: | degrees |
Value assigned 0, 1, 3, 4, 5
| Value | Definition |
|---|---|
| 1 | Strike and dip direction of beds |
| 3 | Strike and dip direction of beds, top of beds known from sedimentary features |
| 4 | Strike and dip direction of overturned beds |
| 5 | Strike of vertical beds, stratigraphic tops to north |
| 9 | Strike and dip direction of foliation |
| 10 | Strike of vertical foliation |
| 12 | Strike and dip direction of cleavage |
| 13 | Strike of vertical cleavage |
| 19 | Strike and dip direction of joints |
| 20 | Strike of vertical joints |
"Yes" - The point is printed or shown on the Geologic map of the Chulitna region, southcentral Alaska (Publication RI 2001-1B-SH1). "No" - The point is not printed or shown on the Geologic map of the Chulitna region, southcentral Alaska (Publication RI 2001-1B-SH1). A value of "No" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).
| Value | Definition |
|---|---|
| 57 | dikes |
| Value | Definition |
|---|---|
| 26 | overturned syncline, showing direction of dip of limbs |
| 27 | overturned anticline, showing direction of dip of limbs |
| Value | Definition |
|---|---|
| 0 | hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 5 | contact |
| 34 | fold axis, anticline or syncline |
| Value | Definition |
|---|---|
| 32 | filled triangle, Tertiary suite |
| 34 | filled circle, Cretaceous suite |
| 64 | open circle, measured section shown as figure in accompanying text report |
| 75 | filled diamond, Cretaceous suite (altered) |
| 76 | half-filled square, Cretaceous suite (probable) |
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. Additional Acknowledgments: C.C. Hawley shared his expertise on the geology, mineral deposits, and mining history of the Chulitna district. Geochronology performed by Paul Layer, Deitre Hansen, Kaitlin Hansen, and Jeff Drake with the University of Alaska Fairbanks Geochronology Lab; paleontologic work was performed under the direction of Robert Blodgett by M.Z. Won and Paula Noble (radiolarians), Chris McRoberts, Michael Sandy, and George Stanley (Mesozoic megafossils), and Norman Savage (conodonts); Michael Whalen assisted with the measurement and interpretation of a Permian limestone section; David Stone, with students Howard Scher and Chad Schopp, conducted paleomagnetic studies; Paul Chu and Adam Low, UAF student interns, provided office compilations and Sara Haug provided field assistance; Mike Messing provided personal geologic mapping and photos of portions of the area.
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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.
Hawley, C.C., and Clark, A.L., 1974, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper PP 758-B, United States Government Printing Office, Washington D.C., Maryland.
Jones, D.L., Silberling, N.J., Csejtey, B., Jr., Nelson, W.H., and Blome, C.D., 1980, Age and structural significance of ophiolite and adjoining rocks in the upper Chulitna district, south-central Alaska: U.S. Geological Survey Professional Paper PP 1121-A, United States Government Printing Office, Washington D.C..
Csejtey, B., Jr., Mullen, M.W., Cox, D.P., and Striker, G.D., 1992, Geology and geochronology of the Healy Quadrangle, south-central Alaska: U.S. Geological Survey Map I-1961 I-1961, United States Government Printing Office, Washington, D.C..
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
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 98-36, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.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, AK.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., 2001, 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 - USA.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:
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, 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 97-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.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 97-8, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Burns, L.E., 1997, Portfolio of aeromagnetic and resistivity maps of the Chulitna mining district: Public Data File PDF 97-7, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Geologic point, line, and polygon data were determined in the field using 1:63,360-scale topographic maps and altimeters. Data were digitized from mylar compilations. Bedrock geologic information was compiled on stable mylar with abundant control points at 1:63,360 scale and registered in ArcEdit, then layered onto a 1:63,360-scale USGS topographic base. 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.
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.
This dataset includes geospatial information about geologic units, age and field sample locations, structural features, structural measurements, and dike locations.
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 2001-1B
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| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2771> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2771> |
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