ancc7nwflt2_arc fault location traces (arc) ancc7nwflt2_point fault location types (point) ancc7nwgeo2_arc geologic unit boundaries (arc) ancc7nwgeo2_polygon geologic units (polygon) ancc7nwsack2_arc sackung failure in bedrock (arc) ancc7nwsack2_polygon sackung failure in bedrock (polygon) c7nwdip_point strike and dip information
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Geologic Map of the Anchorage C-7 NW Quadrangle, Alaska: Report of Investigation RI 94-25, 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 0.000032
Ordinates (y-coordinates) are specified to the nearest 0.000032
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 |
|---|---|
| 1 | Contact |
| Formal codeset | |
|---|---|
| Codeset Name: | RI1994-24-27_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI1994-24-27_codeset.pdf> |
| Formal codeset | |
|---|---|
| Codeset Name: | RI1994-24-27_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI1994-24-27_codeset.pdf> |
| Range of values | |
|---|---|
| Minimum: | 360979.4 |
| Maximum: | 371214.3 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 6834746 |
| Maximum: | 6848709 |
| Units: | meters |
| Value | Definition |
|---|---|
| 1 | Contact |
| 2 | Contact, approximate |
| 3 | Scarp, barb on lower side |
| 5 | Trough, may be ice-marginal channel at lower elevations |
| 6 | Photolineament with no topographic expression evident in aerial photographs. Generally visible as a color or density contrast in vegetation. |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Value | Definition |
|---|---|
| 1 | Strike and dip of foliation. Also shown as SYMBOL=105. |
| 2 | Dip is equal to zero. Also shown as SYMBOL=112. |
| 3 | Strike and dip of beds. Also shown as SYMBOL=101. |
| Value | Definition |
|---|---|
| 101 | Strike and dip of beds. Also shown as CODE=3. |
| 105 | Strike and dip of foliation. Also shown as CODE=1. |
| 112 | Dip is equal to zero. Also shown as CODE=2. |
| Range of values | |
|---|---|
| Minimum: | 364018.304525507 |
| Maximum: | 371181.671787229 |
| Units: | meters |
| Range of values | |
|---|---|
| Minimum: | 6838020.78915279 |
| Maximum: | 6848152.14758965 |
| Units: | meters |
| Value | Definition |
|---|---|
| 0 | Disregard. Drawing line for boundary. |
| 1 | Polygon showing extent of sackung. |
Preparation of these maps was supported in part by the U.S. Geological Survey through the STATEMAP component of the National Cooperative Geologic Mapping Program. Additional Acknowledgments: Field assistance provided by Cheri Daniels, Kristin Kline, and Gina Cruse. Reviewed by Jim Clough and Jeff Kline.
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This series of maps supplements an earlier series of similar maps for the adjacent area to the south between Palmer and Big Lake. A separate geologic-materials map was developed to show the probable distribution of materials with certain ranges of grain sizes, and their relative abundance, because the area is rich in geologic materials that may be useful for construction. It is an important source of construction aggregates for the region, because of extensive glaciofluvial deposits in the area. Additionally, the Castle Mountain fault, which is known to be active, traverses the area of the current series of maps. Although the fault is easily distinguishable in areas immediately to the east and west of the area mapped in this series, it is largely obscured here by surficial deposits and vegetation. We present on these maps the best known surface evidence for faults and possibly fault-related lineaments.
Clardy, B.I., 1984, Bedrock Geologic Features of the Matanuska Valley:.
Clardy, B.I., Hanley, P.T., Hawley, C.C., and LaBelle, J.C., 1984, Guide to the Bedrock and Glacial Geology of the Glenn Highway, Anchorage to the Matanuska Glacier and the Matanuska Coal Mining District: Alaska Geological Society, Anchorage, AK, USA.
Csejtey Jr., B., and Evarts, R.C., 1979, Serpentinite Bodies in the Willow Creek District, Southwestern Talkeetna Mountains, Alaska: U.S. Geological Survey Circular 804B, United States Government Printing Office, Washington D.C., Maryland.
Johnson, K.M. (ed.), and Williams, J.R. (ed.), 1979, The United States Geological Survey in Alaska: Accomplishments During 1978.
Csejtey Jr., B., Nelson, W.H., Jones, D.L., Silberman, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L., 1978, Reconnaissance Geologic Map and Geochronology, Talkeetna Mountains Quadrangle, Northern Part of Anchorage Quadrangle, and Southwestern Corner of Healy Quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558A.
Csejtey Jr., B., and Smith, J.G., 1975, Petrography, Tentative Age, and Correlation of Schist, Willow Creek, Talkeetna Mountains, Southern Alaska: U.S. Geological Survey Circular 722.
Yount, M.E. (ed.), 1975, United States Geological Survey Alaska Program, 1975.
Madden, D.J., Silberman, M.L., and Morre-Nall, A., 1987, Ages and Geologic Relationships in the Willow Creek Gold Mining District, Southwestern Talkeetna Mountains, Southern Alaska: U.S. Geological Survey Open-File Report 87-143.
Magoon, L.B., Adkison, W.L., and Egbert, R.M., 1976, Map Showing Geology, Wildcat Wells, Tertiary Plant Fossil Localities, K-Ar Age Dates, and Petroleum Operations, Cook Inlet Area, Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-1019.
Ray, R.G., 1954, Geology and Ore Deposits of the Willow Creek Mining District, Alaska: U.S. Geological Survey Bulletin 1004.
Silberman, M.L., OLeary, R.M., Csejtey Jr., B., Smith, J.G., and Connor, C.L., 1978, Geochemical Anomalies and Isotopic Ages in the Willow Creek Mining District, Southwestern Talkeetna Mountains, Alaska: U.S. Geological Survey Open-File Report 78-223.
Winkler, G.R., 1992, Geologic Map and Summary Geochronology of the Anchorage 1° x 3° Quadrangle, Southern Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-2283.
Data sources used in this process:
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Geologic Map of the Anchorage C-7 NE Quadrangle, Alaska: Report of Investigation RI 94-24, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Derivative Materials Map of the Anchorage C-7 NE Quadrangle, Alaska: Report of Investigation RI 94-24, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Derivative Materials Map of the Anchorage C-7 NW Quadrangle, Alaska: Report of Investigation RI 94-25, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Geologic Map of the Anchorage C-8 NE Quadrangle, Alaska: Report of Investigation RI 94-26, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Derivative Materials Map of the Anchorage C-8 NE Quadrangle, Alaska: Report of Investigation RI 94-26, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Geologic Map of the Anchorage C-8 NW Quadrangle, Alaska: Report of Investigation RI 94-27, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Reger, R.D., Combellick, R.A., and Pinney, D.S., 1994, Derivative Materials Map of the Anchorage C-8 NW Quadrangle, Alaska: Report of Investigation RI 94-27, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.Online Links:
Geologic point, line, and polygon data were determined in the field using 1:63,360-scale topographic maps and 1:50,000 (nominal) scale, color-infrared aerial photographs. 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 determined visually using topographic maps at a scale of 1:63,360 and 1:50,000 (nominal) scale, and color-infrared aerial photographs.
This dataset includes geospatial information related to geologic units, age and field sample locations, structural features, structural measurements, and fault locations.
Polygon topology present and clean on appropriate data. Other data are line, point, or annotation data 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 data set are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
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- Any hard copies or published data sets utilizing these data sets 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 data sets, 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 94-25
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| Data format: | PDF (version 1.6) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2508> |
| Data format: | ArcGIS Shapefile (version ESRI ArcGIS 9.x) |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2508> |
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