uchenaage_label whole rock major oxide or age date sample (points) uchenaatt_point strike, dip, and fold axis attitude uchenageo_arc geologic units (arc) uchenageo_polygon geologic units (polygons) uchenalin_arc concealed bedrock contacts uchenastr_arc fold and fault traces (arc) uchenastr_point fold and fault traces (points) uchengrit_polygon areas of rubble uchenstr2_arc shear zones
Smith, T.E., Robinson, M.S., Weber, F.R., Waythomas, C.F., and Reifenstuhl, R.R., 1994, Geologic map of the Upper Chena River area, eastern interior Alaska: Professional Report PR 115, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000128
Ordinates (y-coordinates) are specified to the nearest 0.000128
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.
|Codeset Source:||Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/PR115_codeset.pdf>|
|0||Boundary to unmapped area.|
|15||Thrust fault - saw teeth on upper plate; approximately located.|
|16||Thrust fault - saw teeth on upper plate; questionable.|
|3||Strike and dip of vertical beds.|
|5||Strike and dip of foliation; inclined.|
|9||Crumpled, undulatory beds.|
|12||Strike and dip of foliation, vertical.|
|14||Strike and dip of foliation, horizontal.|
|15||Strike and dip of joints, inclined.|
|24||Strike and dip of joints, vertical.|
|33||Bearing and plunge of lineation; c, crenulation; f, minor fold axis; q, quartz boudins; m, mineral.|
|44||Strike and dip of cleavage.|
|2||High-angle fault, approximately located. Arrows show apparent direction of relative horizontal movement. U, upthrown block; D, downside block.|
|3||High-angle fault, concealed. Arrows show apparent direction of relative horizontal movement. U, upthrown block; D, downside block.|
|5||High-angle fault, concealed. Arrows show apparent direction of relative horizontal movement. U, upthrown block; D, downside block.|
|6||High-angle fault, queried where questionable.|
|13||Thrust fault - saw teeth on upper plate. Enclosed circle.|
|14||Thrust fault - saw teeth on upper plate.|
|15||Thrust fault - saw teeth on upper plate. Dashed where approximately located.|
|16||Thrust fault - saw teeth on upper plate. Dashed where approximately located. Queried where questionable.|
|17||Thrust fault - saw teeth on upper plate. Dotted where concealed.|
|18||Thrust fault - saw teeth on upper plate. Dotted where concealed. Queried where questionable.|
|31||Trace and plunge of fold axis.|
|37||High-angle fault. U, upthrown block; D, downside block.|
|16||Trace and plunge of anticlinal fold axis.|
|17||Trace and plunge of synclinal fold axis.|
|144||High angle fault - arrows show apparent direction of relative horizontal movement.|
|27||Concealed bedrock contacts as interpreted by T.E. Smith.|
|1||Shear Zone - undetermined offset.|
|4||Area of bi-modal "quartz-eye" quartzite rubble, mainly in Pcu unit.|
|50||Area of augen gneiss (Pzra) rubble.|
|128||Location of sample for whole rock major oxide or age dating.|
The Alaska legislature provided funding for the studies through capital and operating budget appropriations. Additional Acknowledgments: Geology by T.E. Smith, M.S. Robinson, F.R. Weber, C.F. Waythomas, and R.R. Reifenstuhl, assisted by D.D. Adams, G.L. Allegro, T.D. Balog, D.A. Coleman, J.W. Lindhorst, J.M. Murphy, and D.D. Southworth. Geochronology by J.N. Aleinikoff, U.S. Geological Survey, J.K. Mortenson, Geological Survey of Canada, D.L. Turner, University of Alaska Fairbanks, and F.H. Wilson, U.S. Geological Survey. Richard D. Reger and Richard C. Swainbank provided technical review and Fran Tannian provided a thorough edit. Digital cartography by Fred Sturmann.
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The authors chose to study the upper Chena River district to better understand (1) the source of placer gold resources near Van Curler's Bar, (2) the nature and production potential of tungsten-bearing skarns in the eastern map area, and (3) a proposed route of a transportation corridor through the area. The greatest contribution of this map and report was drawing the striking parallism between Upper Chena stratigraphy with its associated metallogeny and that of the north flank of the Alaska Range.
Wahrhaftig, Clyde, 1968, Schists of the central Alaska Range: U.S. Geological Survey Bulletin B 1254-E, U.S. Geological Survey, Denver, CO.
Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report: Geology and mineral deposits of the Kantishna Hills, Alaska: Alaska Open-File Report AOF 98, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska.
(ed.), George Plafker , and (ed)., H.C. Berg , 1994, The Geology of Alaska: The Geology of North America v. G1, Geological Society of America, Boulder, Colorado.
Data sources used in this process:
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. 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 black and white aerial photographs.
This dataset includes geospatial information related to geologic units, fold and fault traces, strike, dip, and fold axis attitude, concealed bedrock contacts, shear zones, areas of rubble and whole rock major oxide or age date samples.
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?
- 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).
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Professional Report 115
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