fmarpoints locations of Ar/Ar analyses samples fmcompcont geologic bedrock contacts under surficial geology fmcompdikes dike locations (arc) fmcompfolds fold axis (anticline or syncline) traces fmcompgeo comprehensive geologic units fmdikepoints dike locations (point) fmfaults_arc fault contacts (arc) fmfaults_point fault symbols (point) fmfoldsym symbols for folds, anticlines, synclines, and bedding features fmkyanitepts locations where the mineral kyanite was found fmpingos pingo locations fmstrike lineaments and bedding planes
Werdon, M.B., Newberry, R.J., Szumigala, D.J., and Pinney, D.S., 200105, Geologic Map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2001-3A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), Fairbanks, AK, USA.Online Links:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000064
Ordinates (y-coordinates) are specified to the nearest 0.000064
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 6,378,206.400000.
The flattening of the ellipsoid used is 1/294.978698.
Unique sample number designated by the author(s).
| Range of values | |
|---|---|
| Minimum: | 453852 |
| Maximum: | 475609 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7097379 |
| Maximum: | 7122073 |
| Units: | meters |
Unique number assigned to each sample so there is no known domain.
Actual unique symbol used on map for each Ar/Ar location
| Range of values | |
|---|---|
| Minimum: | 453852 |
| Maximum: | 475609 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7097379 |
| Maximum: | 7122073 |
| Units: | meters |
| Value | Definition |
|---|---|
| 0 | Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes |
| 7 | contact inferred |
| 9 | contact concealed |
| Value | Definition |
|---|---|
| S | surficial |
| B | bedrock |
| Value | Definition |
|---|---|
| S | surficial |
| B | bedrock |
| Value | Definition |
|---|---|
| 35 | Anticline or syncline, approximately located |
| 38 | Anticline or syncline, concealed |
| Value | Definition |
|---|---|
| a | anticline |
| s | syncline |
| oa | overturned anticline |
| os | overturned syncline |
| Value | Definition |
|---|---|
| 22 | Anticline |
| 23 | Syncline |
| 27 | Overturned anticline, showing direction of dip of limbs |
| 26 | Overturned syncline, showing direction of dip of limbs |
| Value | Definition |
|---|---|
| lake | polygons defining a lake |
| Formal codeset | |
|---|---|
| Codeset Name: | PIR2001-3_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys |
| Range of values | |
|---|---|
| Minimum: | 451156.20980409 |
| Maximum: | 475701.268132906 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7096973.31683337 |
| Maximum: | 7124913.26553537 |
| Units: | meters |
| Value | Definition |
|---|---|
| GS | Fluvial and glaciofluvial gravel, sand and silt. Chiefly (estimated >80 percent) clean sand and gravel. |
| GM | Poorly- to moderately well-sorted clay, silt, sand, gravel, and diamicton of colluvial, fluvial and glacial origins. Includes angular, unsorted talus debris and chaotically deformed colluvium derived from landslides. |
| SM | Silt deposited primarily by wind and reworked by fluvial and colluvial processes. May be organic rich. |
| OR | Organic-rich silt and peat in bogs, former stream channels, and lake basins. Commonly frozen ice-rich due to the excellent insulating properties of peat. |
| BC | Medium-jointed, fine- to coarse-grained sedimentary carbonate rocks and their metamorphic equivalents. Includes limestone and marble |
| BG | Coarse-jointed, coarse-grained igneous lithologies and their metamorphic equivalents. Chiefly granitic rocks. Includes coarse-grained gneiss. |
| BM | Medium-jointed, fine- to medium-grained quartzose sedimentary rocks and their metamorphic equivalents. Chiefly quartzite in this map area. |
| BV | Medium-jointed, fine-grained igneous rocks and their metamorphic equivalents. Chiefly metavolcanics and dikes |
| BO | Rocks of lithologies: (a) not listed in other materials classes, but which may be suited for use as construction materials or for other specialized purposes; and (b) mixed units composed of combinations of the above bedrock materials classes. Includes fine-grained gneiss and phyllite. |
| BU | Rocks of mixed lithology and/or very fine-grained sedimentary lithologies that are generally poorly suited for use as construction materials. Includes coal-bearing Tertiary sediments. |
| Value | Definition |
|---|---|
| 57 | dikes |
| Value | Definition |
|---|---|
| S | surficial |
| B | bedrock |
unique value given to every station based on the year, who is creating the station and the number system that they decide on.
| Range of values | |
|---|---|
| Minimum: | 451314 |
| Maximum: | 475609 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7097489 |
| Maximum: | 7124732 |
| Units: | meters |
| Value | Definition |
|---|---|
| 4 | pegmatite dike |
| 8 | granite dike |
| 12 | gabbro dike |
| 6 | clinopyroxenite dike |
| 9 | diabase dike |
| 5 | aplite |
| 111 | granite dike (?) |
| 13 | felsic dike, general |
| 4.5 | (?) |
| 1 | meta-aplite |
| 2 | quartz monzonite |
| 3 | intermediate dike |
| 140 | aplite-pegmatite dike (?) |
| 11 | tertiary basalt |
| 14 | gabbro in TMB (?) or porphyritic granodiorite |
| 15 | Iamprophyre |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees from horizontal |
user needs to look up information in ArcInfo marker set
| Value | Definition |
|---|---|
| 21 | plotter.mrk |
| 97 | plotter.mrk |
| 29 | plotter.mrk |
| 49 | plotter.mrk |
| 126 | plotter.mrk |
| 126 | water.mrk |
| 138 | water.mrk |
| 107 | water.mrk |
| 109 | water.mrk |
| 107 | mineral.mrk |
| 103 | mineral.mrk |
| 103 | oilgas.mrk |
made up list of values by DGGS with no short name.
produced from field notes so there is no domain already established.
| Value | Definition |
|---|---|
| 12 | Fault, approximately located |
| 16 | Fault, hypothetical |
| 19 | Thrust fault, inferred |
| Value | Definition |
|---|---|
| 25 | Relative horizontal movement along fault |
Unique sample number designated by the author(s).
| Range of values | |
|---|---|
| Minimum: | 462333 |
| Maximum: | 475609 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7097953 |
| Maximum: | 7114943 |
| Units: | meters |
Unique label designated by the author(s).
The description is not from any specific domain
The description is not from any specific domain
The description is not from any specific domain
| Value | Definition |
|---|---|
| S | Fluvial and glaciofluvial gravel, sand, and silt. Chiefly (estimated >80 percent) clean sand and gravel. Grain size, sorting and degree of stratification are variable. |
| Range of values | |
|---|---|
| Minimum: | 451594 |
| Maximum: | 475614 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7097691 |
| Maximum: | 7124971 |
| Units: | meters |
Unique sample number designated by the author(s).
| Value | Definition |
|---|---|
| f | foliation |
| vf | vertical foliation |
| b | bedding |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees from horizontal |
| Value | Definition |
|---|---|
| 9 | foliation strike/dip |
| 10 | vertical foliation strike/dip |
| 1 | bedding strike/dip |
| Range of values | |
|---|---|
| Minimum: | 451594 |
| Maximum: | 475614 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7097691 |
| Maximum: | 7124971 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
This project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program 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 geologic mapping was also provided by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP award number 00HQAG0071 under the NCGM STATEMAP program for FY2000. 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.
(907) 451-5029 (voice)
(907) 451-5050 (FAX)
dggspubs@alaska.gov
This project, resulting map, geospatial data are intended to provide a geologic map and a geologic interpretation of the Fortymile mining district at 1:63,360 scale. Previous published 1:63,360 scale geologic maps of this area have been reconnaissance-level maps or only covered portions of the quadrangle. Mapping at 1:63,360 scale (or more detailed) is needed to identify critical geologic features that may relate to more regional structures or geologic units. These detailed observations are also critical to test or use in tectonic models. This map also provides a geologic base in which to interpret geochemical results from the concurrent DGGS rock sampling program.
Foster, H.L., 1969, Reconnaissance geology of the Eagle A-1 and A-2 Quadrangles, Alaska: U.S. Geological Survey Bulletin B 1271-G, United States Government Printing Office, Washington D.C., Maryland.
Newberry, R.J., Layer, P.W., Solie, D.N., and Burleigh, R.E., 1998, New 40Ar/39Ar dates for intrusions and mineral prospects in the eastern Yukon-Tanana Terrane, Alaska- regional patterns and significance:.This is part of the following larger work.
Gray, J.E. (ed.), and Riehle, J.R. (ed.), 1998, Geologic studies in Alaska by the USGS, 1996: US Geological Survey Professional Paper 1595, United States Government Printing Office, Washington D.C., Maryland.
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Finseth, B.A., Pinney, D.S., and Flynn, R.L., 200004, Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in a portion of the Fortymile mining district, Alaska, 1999: Raw Data File RDF 2000-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Werdon, M.B., Szumigala, D.J., Newberry, R.J., Grady, J.C., and Munly, W.C., 2000, Major oxide, minor oxide, trace element, rare-earth element, and geochemical data from rocks collected in Eagle and Tanacross quadrangles, Alaska in 2000: Raw Data File RDF 2000-4, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Alaska Division of Geological & Geophysical Surveys, Geoterrex-Dighem, and Stevens Exploration Inc. Staff, 199901, Profile and gridded data and section lines of 1998 geophysical survey data for part of the Fortymile mining district, Alaska, southern Eagle and northern Tanacross quadrangles: Public Data File PDF 99-9, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Naeser, N.D., Westgate, J.A., Hughes, O.L., and Pewe, T.L., 1982, Fission-track ages of late Cenozoic distal tephra beds in the Yukon Territory and Alaska: Canadian Journal of Earth Sciences Vol. 19, Canadian Journal of Earth Sciences, Canada.
Yeend, Warren, 1996, Gold placers of the historical Fortymile River region, Alaska: U.S. Geological Survey Bulletin 2125, United States Government Printing Office, Washington D.C., Maryland.
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
Data sources used in this process:
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Finseth, B.A., Pinney, D.S., and Flynn, R.C., 200004, Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in a portion of the Fortymile mining district, Alaska, 1999: Raw Data File RDF 2000-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Werdon, M.B., Szumigala, D.J., Newberry, R.J., Grady, J.C., and Munley, W.C., 2000, Major oxide, minor oxide, trace element, rare-earth element, and geochemical data from rocks collected in Eagle and Tanacross quadrangles, Alaska in 2000: Raw Data File RDF 2000-4, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Alaska Division of Geological & Geophysical Surveys, Geoterrex-Dighem, and Stevens Exploration Inc. Staff, 199901, Profile and gridded data and section lines of 1998 geophysical survey data for part of the Fortymile mining district, Alaska, southern Eagle and northern Tanacross quadrangles: Public Data File PDF 99-9, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Burns, L.E., and Liss, S.A., 199901, Portfolio of aeromagnetic and resistivity maps of part of the Fortymile mining district, Alaska, southern Eagle and northern Tanacross quadrangles: Public Data File PDF 99-6, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Pritchard, R.A., 199905, Project report of the 1998 geophysical survey data for of part of the Fortymile mining district, Alaska, southern Eagle and northern Tanacross quadrangles: Public Data File PDF 99-7, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Werdon, M.B., Newberry, R.J., and Szumigala, D.J., 200105, Geologic Map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska 2001: Preliminary Interpretive Report PIR 2001-3B, 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 Eagle A-2 Quadrangle, Fortymile mining district, Alaska 2001: Preliminary Interpretive Report PIR 2001-3C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Pinney, D.S., 200105, Engineering-geologic Map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska 2001: Preliminary Interpretive Report PIR 2001-3D, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Yeend, Warren, 1996, Gold placers of the historical Fortymile River region, Alaska: U.S. Geological Survey Bulletin 2125, United States Government Printing Office, Washington D.C., Maryland.
Geospatial data were digitized from mylar and paper geologic compilations. This compilation for the surficial-geologic information was done on a paper map of the USGS topographic base for each of the 1:63,360 scale USGS topographic bases included in the map area. Bedrock geologic information was compiled on stable mylar with abundant control points at 1:50,000 scale that was scanned and co-registered in ArcView GIS Version 3.1? to 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.
Surficial mappers recorded observations on 1:50,000 scale (nominal) color-infrared aerial photographs and 1:63,360 scale topographic base maps.
This data set includes geospatial information about geologic units, age and field sample locations, structural features, structural measurements, pingo and dike locations.
Polygon topology present. Polygon topology present on appropriate data; others are line, point, or annotation data and do not require topologic relationships.
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
Preliminary Interpretive Report 2001-3A
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 $13.00 (contact information below) plus shipping if mailed.
| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2669> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2669> |
| 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