eaga1ages_2 age date locations eaga1bedcont2 bedrock unit contact boundaries eaga1compdike dike strike orientations eaga1compfld2 axial traces eaga1compflt2 fault traces eaga1compgeo3 uncoded contacts surrounding the surficial and bedrock units eaga1compshr uncoded contacts surrounding the exposed sheared bedrock units eaga1dikes dike composition and location eaga1faultsym fault orientation eaga1foldsym fold orientation eaga1indmin kyanite, staurolite, and tourmaline localities identified by thin section petrography eaga1pingo pingo locations eaga1srfcont contacts surrounding the surficial units eaga1str foliation and bedding structural information
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Athey, J.E., Stevens, D.S.P., Flynn, R.L., Clautice, K.H., and Craw, P.A., 2002, Geologic map of the Eagle A-1 Quadrangle, Fortymile mining district: Preliminary Interpretive Report PIR 2002-1A.Online Links:
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000032
Ordinates (y-coordinates) are specified to the nearest 0.000032
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.
Generic example of unique sample identifier: YYAAA999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 999=unique station number, X=null or unique alpha character designating a sample was taken at the field station
| Range of values | |
|---|---|
| Minimum: | 6/7/2000 |
| Maximum: | 8/27/2000 |
| Units: | MM/DD/YY date |
| Range of values | |
|---|---|
| Minimum: | 478000 |
| Maximum: | 499904 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7101973 |
| Maximum: | 7120500 |
| Units: | meters |
sample descriptions
sample descriptions
| Value | Definition |
|---|---|
| 0 | line not visible, faulted contact |
| 4 | bounding box |
| 7 | contact inferred |
| 9 | contact concealed |
| Value | Definition |
|---|---|
| S | surficial, bedrock contact is covered by surficial deposits |
| B | bedrock, bedrock contact is not covered by surficial deposits |
| Value | Definition |
|---|---|
| 57 | Dikes |
| Value | Definition |
|---|---|
| S | surficial, arc segment is covered by surficial deposits |
| B | bedrock, arc segment is not covered by surficial deposits |
| Value | Definition |
|---|---|
| anti | anticline |
| syn | syncline |
| overanti | overturned anticline |
| oversyn | overturned syncline |
| Value | Definition |
|---|---|
| 35 | anticline or syncline, approximately located |
| 38 | anticline or syncline, concealed |
| Value | Definition |
|---|---|
| S | surficial, segment of axial trace is covered by surficial deposits |
| B | bedrock, segment of axial trace is not covered by surficial deposits |
| Value | Definition |
|---|---|
| 12 | Fault, approximately located |
| 15 | Fault, concealed |
| 18 | Thrust fault, approximately located |
| 22 | Thrust fault, concealed |
| Value | Definition |
|---|---|
| S | surficial, segment of fault trace is covered by surficial deposits |
| B | bedrock, segment of fault trace is not covered by surficial deposits |
| Formal codeset | |
|---|---|
| Codeset Name: | PIR2002-1_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys |
| Formal codeset | |
|---|---|
| Codeset Name: | PIR2002-1_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys |
| Value | Definition |
|---|---|
| shr_Ts | (sheared) SEDIMENTARY ROCKS (Tertiary) - Poorly- to well-indurated, nonmarine sedimentary rocks of Tertiary age, as established by pollen (Foster, 1976; Foster and Igarashi, 1990). |
| shr_pMsg | (sheared) SCHIST AND PARAGNEISS (Pre-Mississippian) Mixed unit characterized by abundant aluminous metasedimentary rocks. |
Generic example of unique sample identifier: YY(YY)AAA999X: YY=last two digits of year or complete 4 digit year, AAA=geologist’s initials (one to three characters), 999=unique station number, X=null or unique alpha character designating a sample was taken at the field station
| Value | Definition |
|---|---|
| 1 | Diabase, equivalent to eTd (Tertiary) |
| 6 | Aplitic to pegmatitic; interpreted to be the latest phase of Jurassic, equivalent to Jga intrusions (Jurassic) |
| 7 | Felsic to intermediate granitic; equivalent to Jurassic intrusions (Jurassic), equivalent to Jg |
| 11 | Foliated; may either be syn-Jurassic deformation, or part of the pre-Mississippian amphibolite-facies metamorphic rocks |
| 13 | Rhyolite, equivalent to lKf (Cretaceous) |
| 14 | Hornblendite; equivalent to Jh (Jurassic) |
| 16 | Basalt, equivalent to lTb (Tertiary) |
| Range of values | |
|---|---|
| Minimum: | 475893 |
| Maximum: | 498930 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7096891 |
| Maximum: | 7124037 |
| Units: | meters |
| Value | Definition |
|---|---|
| 7 | Bearing of dip of fault |
| Value | Definition |
|---|---|
| 22 | Anticline |
| 23 | Syncline |
| 26 | Overturned syncline |
| 27 | Overturned anticline |
| 39 | Arrow indicating plunging direction of fold axis |
| Value | Definition |
|---|---|
| anti | anticline |
| syn | syncline |
| overanti | overturned anticline |
| oversyn | overturned syncline |
Generic example of unique sample identifier: (YY)YYAAA999X: (YY)YY=last two digits of year or complete 4 digit year, AAA=geologist’s initials (one to three characters), 999=unique station number, X=null or unique alpha character designating a sample was taken at the field station; some sample identifiers have “–M/DD” at the end of the identifier, which indicates the date the sample was collected
| Range of values | |
|---|---|
| Minimum: | 475609 |
| Maximum: | 498703 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7098732 |
| Maximum: | 7123509 |
| Units: | meters |
| Value | Definition |
|---|---|
| kyanite | kyanite |
| staurolite | staurolite |
| tourmaline | tourmaline |
| Value | Definition |
|---|---|
| K | kyanite |
| S | staurolite |
| T | tourmaline |
| Value | Definition |
|---|---|
| 52 | Pingo |
| Formal codeset | |
|---|---|
| Codeset Name: | PIR2002-1_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys |
Generic example of unique sample identifier: YYYYAAA999X: YYYY=complete 4 digit year, AAA=geologist’s initials (one to three characters), 999=unique station number, X=null or unique alpha character designating a sample was taken at the field station
| Range of values | |
|---|---|
| Minimum: | 1999 |
| Maximum: | 2001 |
| Units: | year |
| Value | Definition |
|---|---|
| DS | David Szumigala |
| JEA | Jennifer Athey |
| JG | Jesse Grady |
| KC | Karen Clautice |
| MBW | Melanie Werdon |
| RN | Rainer Newberry |
| WM | Walt Munly |
| Z | David Szumigala |
Station number unique for a geologist for one calendar year
Sample identifier unique for a field station number
| Range of values | |
|---|---|
| Minimum: | 475775 |
| Maximum: | 499955 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 7096872 |
| Maximum: | 7124495 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Value | Definition |
|---|---|
| fol | foliation |
| vertfol | vertical foliation |
| flatfol | horizontal foliation |
| bed | bedding |
| Value | Definition |
|---|---|
| 1 | Strike and direction of dip of beds |
| 9 | Strike and direction of dip of foliation |
| 10 | Strike of vertical foliation |
| 11 | Horizontal foliation |
The geologic work was funded by the Alaska State Legislature through a Capital Improvement Project (Alaska Airborne Geophysical/Geological Mineral Inventory Program) and the general fund and through the U.S. Geological Survey STATEMAP program under U.S. Department of the Interior, U.S. Geological Survey, National Cooperative Geologic Mapping Program assistance award 01HQAG0054. 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. DGGS student interns and volunteers providing field assistance include Bryan A. Finseth (1999), Mark Mccrary (1999), J.C.Grady (2000), W.C. Munley (2000), and M.R. Johnson (2001). Milton A. Wiltse provided technical review of the maps. Jessica Mayer provided assistance with surficial geologic studies.
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The resulting map and data are intended to provide a geologic map and a geologic interpretation of the Fortymile mining district at 1:63,360 scale. Previously published geologic maps at a 1:63,360 scale of this area have been reconnaissance-level maps or only covered portions of the quadrangle. Mapping at 1:63,360 scale or greater detail 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., USA.Online Links:
Flynn, R.L., and Newberry, R.J., 2001, Geology of the Boundary area, Eagle A-1 Quadrangle, east-central Alaska: U.S. Geological Survey EDMAP program U.S. Geological Survey EDMAP program, under assistance Award No. 00HQAG0061, Flynn, R.L., Fairbanks, AK, USA.
Day, W.C., Aleinikoff, J.N., and Gamble, B.M., 2002, Geochemistry and age constraints on metamorphism and deformation of the Fortymile River area, eastern Yukon-Tanana Upland, Alaska: U.S. Geological Survey Professional Paper P 1662, U.S. Geological Survey, Washington D.C., USA.Online Links:
Wilson, F.H. (ed.), and Galloway, J. (ed.), Unknown, Studies by the U.S. Geological Survey in Alaska, 2000: U.S. Geological Survey Professional Paper P 1662, U.S. Geological Survey, Washington D.C., USA.Online Links:
Burns, L.E., Dighem, and Stevens Exploration Management Corp., 1999, CD-ROM containing 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, Alaska, USA.Online Links:
Yeend, W.E., 1996, Gold placers of the historical Fortymile River region, Alaska: U.S. Geological Survey Bulletin B 2125, U.S. Geological Survey, Washington D.C., USA.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:
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Finseth, B.A., Pinney, D.S., and Flynn, R.L., 2000, 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:
Szumigala, D.J., Werdon, M.B., Newberry, R.J., Athey, J.E., Clautice, K.H., Flynn, R.L., Grady, J.C., Munly, W.C., and Johnson, M.R., 2002, Major oxide, minor oxide, trace element, rare-earth element, trace geochemical, and coal quality data from rocks collected in Eagle and Tanacross quadrangles, Alaska in 1999, 2000, and 2001: Raw Data File RDF 2002-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
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: U.S. Geological Survey Professional Paper P 1595, U.S. Geological Survey, Washington D.C., USA.Online Links:
Gray, J.E. (ed.), and Riehle, J.R. (ed.), 1998, Geologic studies in Alaska by the USGS, 1996: U.S. Geological Survey Professional Paper P 1595, U.S. Geological Survey, Washington D.C., USA.Online Links:
USGS, 19970808, Digital Raster Graphic (DRG), Eagle A-1: None None, USGS, Reston, VA, USA.Online Links:
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., Athey, J.E., Flynn, R.L., and Clautice, K.H., 2002, Bedrock geologic map of the Eagle A-1 Quadrangle, Fortymile mining district: Preliminary Interpretive Report PIR 2002-1B, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Werdon, M.B., Newberry, R.J., Szumigala, D.J., and Pinney, D.S., 2001, Geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska: Preliminary Interpretive Report PIR 2001-3A, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.Online Links:
Geologic location data were downloaded from Garmin 12XL GPS units into an Access database. Selected sample numbers and locations were queried from the database and brought into a Microsoft Excel 2000 spreadsheet. Spatial reference files were created in MapInfo Professional 6.5 and translated into Arc/Info point coverage format. Data for bedrock-geologic arc and polygon coverages were 'on screen' digitized from a scanned mylar geologic compilation. Bedrock-geologic information was compiled on stable mylar with abundant control points at 1:50,000 scale and registered in MapInfo Professional 6.5, then reduced to a layer onto a 1:63,360-scale USGS topographic base. 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.
Location data were downloaded from Garmin 12XL GPS units into an Access database. Sample numbers and locations with selected data were queried from the database or brought into an Excel spreadsheet and then spatially analyzed in MapInfo Professional 6.5. 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, pingo, and dike locations.
Polygon topology present and clean on appropriate data. Other data 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 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 hardcopies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, they are 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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Preliminary Interpretive Report 2002-1A
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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/10.14509/2863> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2863> |
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