mcggeog_arc geologic map unit contacts (arc) mcggeog_poly geologic map unit contacts (polygon) mcgflt_arc fault location traces and types mcgglacial_arc glacial extents mcgcline_arc anticline and syncline traces of axial planes mcgdike_arc dike locations and probable lengths mcgstrsym_point points for the strike, dip, and plunge of bedding planes, foliation, and various lineaments mcgstrdip_point point attribute table that displays strike and dip information mcgmine_point location of selected mineral deposits and energy resources
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:
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.
| Value | Definition |
|---|---|
| 5 | Contact |
| Value | Definition |
|---|---|
| C | Contact only |
| F | Contact/fault |
| 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> |
| 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> |
| Value | Definition |
|---|---|
| 11 | high-angle fault |
| 12 | Approximately located fault |
| 13 | Fault, inferred |
| 15 | Concealed fault |
| 17 | Thrust fault, sawteeth on upper plate |
| 33 | Lineament, used on small-scale tectonic maps |
| Value | Definition |
|---|---|
| C | Contact only |
| F | Contact/fault |
| Value | Definition |
|---|---|
| 42 | Glacial limit I, approximately located, first advance (oldest) |
| 44 | Glacial limit II, approximately located, second advance |
| 46 | Glacial limit III, approximately located, third advance |
| 48 | Glacial limit IV, approximately located, fourth advance |
| 50 | Glacial limit V, approximately located, fifth advance |
| Value | Definition |
|---|---|
| 34 | Fold axis anticline or syncline. |
| 38 | Anticline or syncline, concealed. |
| Value | Definition |
|---|---|
| 54 | Dikes |
| 55 | Dikes |
| 56 | Dikes |
| 57 | Dikes |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Value | Definition |
|---|---|
| 1 | Strike and direction of dip of beds. |
| 4 | Strike and dip of overturned beds. |
| 5 | Strike of vertical beds, stratigraphic tops to north. |
| Range of values | |
|---|---|
| Minimum: | 422695.41 |
| Maximum: | 499879.98 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 6874551.19 |
| Maximum: | 6952135.66 |
| Units: | meters |
| Value | Definition |
|---|---|
| 22 | Anticline and trace of axial plane. |
| 23 | Syncline and trace of axial plane. |
| 24 | Relative horizontal movement along fault |
| 25 | Relative horizontal movement along fault |
| 26 | overturned syncline, showing direction of dip of limbs |
| 27 | Overturned anticline, showing direction of dip of limbs |
| 39 | Provides direction of plunge. |
| Value | Definition |
|---|---|
| 143 | Specific symbol to designate sample locality. |
These values represent the actual locality numbers given to each selected mineral deposits and energy resources. They coincide with Table 1 ("Name of Deposit") of the report Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska.
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: Bedrock geology field investigations by T.K. Bundtzen (1980-1984,1988-1989,1993), W.G. Gilbert (1981-1984,1989), E.E. Harris (1988-1989,1993), D.N. Solie (1981-1982,1984,1988-1989), and J.T. Kline (1980-1982,1988-1989). Additional field contributions by M.S. Lockwood(1982-1983), J.G.Clough(1981,1983), T.E. Smith(1982-1983), Kate Bull (1981-1982), K.M. McDonald (1982), Kristin Kline (1981), D.B. Dickey (1981), John Ebel (1982), Larry Lueck (1980), G.M. Laird (1989), Grant Abbot (1989,1993), S.P. Gordey (1989), R.B. Blodgett (1982-1983,1989), D.J. Szumigala (1983), and Carolyn Parker (1983). Surficial geology field investigations by J.T. Kline (1980-1982,1988-89) and T.K. Bundtzen (1981-1984, 1988). Map synthesis and compilation by E.E. Harris and T.K. Bundtzen; Technical review by M.L. Miller and R.A. Combellick; Electronic digital cartography by A.M. McCarthy and G.R.C. Graham; Color design by Ann-Lillian Schell; Editing done by Paula K. Davis.
(907) 451-5029 (voice)
(907) 451-5050 (FAX)
dggspubs@alaska.gov
This project and resulting report, map and layers are intended to provide a geologic map and a geologic interpretation of the eastern half of the McGrath Quadrangle at 1:125,000 scale. Companies involved in or considering mineral exploration in the McGrath area will find this map useful, as well as persons examining the region's coal resources as a potential fuel for local heat and power development.
Kline, J.T., and Pinney, D.S., 19970620, 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:
Fernald, A.T., 1960, Geomorphology of the Upper Kuskokwim Region, Alaska: U.S. Geological Survey Bulletin 1071-G B 1071-G, United States Government Printing Office, Washington, D.C..Online Links:
Kline, J.T., and Bundtzen, T.K., 1986, Two Glacial Records from West-Central Alaska: Geological Society of Alaska, Anchorage, AK, USA.
T.D. Hamilton, eds., K.M. Reed, eds., and R.M. Thorson, eds., 1986, Glaciation in Alaska: the Geologic Record: Geological Society of Alaska, Anchorage, AK, USA.
Reed, B.L., and Lanphere, M.A., 1972, Generalized Geologic Map of the Alaska-Aleutian Range Batholith Showing Potassium-Argon Ages of the Plutonic Rocks: U.S. Geological Survey Miscellaneous Field Studies Map 372 MF-372, United States Government Printing Office, Washington, D.C..Online Links:
Reed, B.L., and Nelson, S.W., 1980, Geologic Map of the Talkeetna Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-1174 I-1174, United States Government Printing Office, Washington, D.C..Online Links:
Herreid, G.H., 1968, Geological and Geochemical Investigations Southwest of Farewell, Alaska: Geologic Report GR 26, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Michael Churkin, Jr., and Carter, Claire, 1996, Stratigraphy, Structure, and Graptolites of an Ordovician and Silurian Sequence in the Terra Cotta Mountains, Alaska Range, Alaska: U.S. Geological Survey Professional Paper 1555 P 1555, United States Government Printing Office, Washington, D.C..Online Links:
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:
Kline, J.T., and Bundtzen, T.K., 1986, Two Glacial Records from West-Central Alaska: Geological Society of Alaska, Anchorage, AK, USA.
Hamilton, T.D. (ed.), Reed, K.M. (ed.), and Thorson, R.M. (ed.), 1986, Glaciation in Alaska: the Geologic Record: Geological Society of Alaska, Anchorage, AK, USA.
Bundtzen, T.K., Kline, J.T., and Clough, J.G., 1982, Preliminary Geology of McGrath B-2 Quadrangle, Alaska: Alaska Open-File Report 149 AOF 149, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Gilbert, W.G., Solie, D.N., Kline, J.T., and Dickey, D.B., 1990, Geologic Map of the McGrath B-3 Quadrangle, Alaska: Professional Report 102 PR 102, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, 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:
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 geologic units, sample locations, structural features, structural measurements, dikes, selected mines, glacial limits, and materials units.
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:
- 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.
907-451-5020 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov
Report of Investigation 97-14A
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.
Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.
Printed publication can be purchased for $17.00 (contact information below) plus shipping if mailed.
| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2549> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2549> |
| Media you can order: |
CD-ROM
(format Joliet)
|
Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files.
Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (<http://www.dggs.alaska.gov/>) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard.
Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid.
Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.
907-451-5039 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov