mcgmat_arc materials units (arc) mcgmat_poly materials units (polygon) faultzone_arc indicates location of the Denali-Farewell fault system (arc) faultzone_poly indicates location of the Denali-Farewell fault system (polygon)
Kline, J.T., and Pinney, D.S., 1997, Derivative Map of the Geologic Materials and Hazards in the Eastern Half McGrath Quadrangle, Alaska: Report of Investigations RI 97-14B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
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 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.
| Formal codeset | |
|---|---|
| Codeset Name: | RI1997-14_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI1997-14_codeset.pdf> |
This map synthesis was partially supported by the U.S. Geological Survey's National Mapping Program under cooperative agreement 1434-HQ-96-AG-01471. 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: Map synthesis and compilation by D.S. Pinney; Technical review by R.A. Combellick and T.K. Bundtzen; Electronic digital cartography by A.M. McCarthy and G.R.C. Graham; Color design by Ann-Lillian Schell; Editing done by Paula K. Davis.
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The purpose of this map is to indicate general areas that deserve consideration for certain materials and to eliminate other general areas from consideration for these materials. Local variations are common, especially near unit boundaries.
Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska.: Report of Investigations RI 97-14A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.Online Links:
Bundtzen, T.K., Kline, J.T., Smith, T.E., and Albanese, M.D., 1987, Geologic Map of the McGrath A-2 Quadrangle, Alaska: Professional Report 91 PR 91, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Gilbert, W.G., Solie, D.N., and Kline, J.T., 1988, Geologic Map of the McGrath A-3 Quadrangle, Alaska: Professional Report 92 PR 92, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Kline, J.T., Gilbert, W.G., and Bundtzen, T.K., 1986, Preliminary Geologic Map of the McGrath C-1 Quadrangle, Alaska: Report of Investigations RI 86-25, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.Online Links:
Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska.: Report of Investigations RI 97-14A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.Online Links:
Data for geologic layers was digitized off of a mylar geologic compilation. This compilation was done on a stable mylar of the USGS topographic base for the McGrath Quadrangle, Alaska that was photographically enlarged to 1:125,000. (Topographic base compiled in 1965, revised in 1978, 1980, and 1982.) 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 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos. The lists of samples were visually checked against the lists of analyzed samples returned from the laboratories.
Thommen TM altimeters were frequently used and calibrated daily.
This data set includes coverages that contain information about materials units and fault system location.
Polygon topology present and clean on appropriate coverages. Other coverages are line, point, or annotation coverages and do not require topologic relationships. Chain-node topology present.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
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Report of Investigation 97-14B
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| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2550> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
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| Network links: |
<http://dx.doi.org/10.14509/2550> |
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