USGS Geoscience Data Catalog
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Nelson, Steven W., Miller, Marti L., Haeussler, Peter J., Snee, Lawrence W., Phillips, Patti J., and Huber, Carol, 1999, Preliminary geologic map of the Chugach National Forest special study area, Alaska: U.S. Geological Survey Open-File Report OFR 99-362.Online Links:
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 200
Ordinates (y-coordinates) are specified to the nearest 200
Planar coordinates are specified in meters
Value | Definition |
---|---|
1 | Stratigraphic or intrusive contact, location certain |
4 | Cross-section line |
7 | Shoreline or riverbank |
15 | Ice contact |
18 | Internal contact |
50 | Quartz vein, mineralized and unmineralized |
51 | Concealed contact |
52 | Concealed fault |
77 | Fault, location certain |
79 | Fault, location approximate |
93 | Lineament identified from air photos. Possible fault. |
99 | Bounding line of coverage |
Value | Definition |
---|---|
5 | Ice |
7 | Q - Surficial deposits, undivided (Holocene) |
33 | Tosg - Orca Group shale or argillite (Lithofacies G) (Eocene and Paleocene) |
57 | Water |
67 | Kvsbd - Valdez Group massive sandstone and rythmite (Lithofacies B and D) (Upper Cretaceous) |
69 | Kvsc - Valdez Group 'typical' turbidites (Lithofacies C) (Upper Cretaceous) |
70 | Tkvv - Volcanic and sedimentary rocks, undivided (Late Cretaceous and Tertiary) |
73 | Kvsb - Valdez Group massive sandstone (Lithofacies B) (Upper Cretaceous) |
85 | Tosbd - Orca Group massive sandstone and rythmite (Lithofacies B) (Eocene and Paleocene) |
86 | Tosb - Orca Group massive sandstone (Lithofacies B) (Eocene and Paleocene) |
88 | Tosf - Orca Group chaotic deposits (Lithofacies F) (Eocene and Paleocene) |
93 | Tosc - Orca Group 'typical' turbidites (Lithofacies C) (Eocene and Paleocene) |
96 | Tosa - Orca Group conglomerate (Lithofacies A) (Eocene and Paleocene) |
97 | Tosd - Orca Group rythmite (Lithofacies D) (Eocene and Paleocene) |
107 | Tf - Felsite dikes (Tertiary) |
112 | Tgd - Gabbro and diorite of Miners Bay (Oligocene) |
119 | Tg - Leucocratic granite (Oligocene) |
120 | Tosv - Orca Group volcaniclastic rocks (Eocene and Paleocene) |
123 | Top - Orca Group pillow basalt (Eocene and Paleocene) |
126 | Tod - Orca Group sheeted dikes (Eocene and Paleocene) |
Patti J. Phillips, Kelly M. Brunt (Raytheon contractor)
907-561-1181 (voice)
pheuslr@usgs.gov
Digital representation of geologic mapping of the Chugach National Forest Special Study Area is to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, however the geological data in this coverage is not intended for use at a scale larger than 1:63,360.
The linework was captured by hand digitizing from hand-drawn 1:63,360-scale stable base mylar maps in good condition. Vector and polygon attributes were obtained from field maps and compilations. The digital data has been visually checked and the geologic map has undergone technical review.
Users of this digital geologic map should respect the intentions of the original mappers and the limitations of the map. This geologic map is intended to be used at a scale of 1:63,360; it is not intended to be used at a more detailed scale.
The digital data files are the geospatial files used to created the geologic map. They do not include the tables, text or figures shown in the Open-File Report.
The geology data set, chuggeol, is a network coverage
containing arcs and polygons. Each polygon has a coded
attribute designating the mapped geologic unit. Faults
and stratigraphic contacts are represented as arcs. When
a fault is also a stratigraphic contact, only a single arc
is present. Dangling arcs may be present (faults, dikes,
etc.)
The data set, chugstruct, is a point coverage containing
annotation. This coverage displays the strike and dip
measurements of beds and folds.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
303-202-4200 or 1-888-ASK-USGS (voice)
USGS OFR 99-362 (digital)
Although this data has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.
Data format: | ARCE |
---|---|
Network links: |
<http://geopubs.wr.usgs.gov/open-file/of99-362> |
907-561-1181 (voice)
nshew@usgs.gov