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Yerkes, R. F. , and Campbell, R. H. , 1997, Preliminary geologic map of the Point Dume 7.5' quadrangle, southern California: A digital database: U.S. Geological Survey Open-File Report 97-276.Online Links:
This is a vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest unknown
Ordinates (y-coordinates) are specified to the nearest unknown
Planar coordinates are specified in meters
Value | Definition |
---|---|
contact, approx. located | Contact whose position is not precisely located |
CaCOvein, certain | Calcium carbonate vein |
bed, limestone | Location of limestone bed |
bed, sandstone | Location of sandstone bed |
bed, siltstone | Location of siltstone bed |
contact, certain | Observed contact |
contact, concealed | Concealed contact whose position is inferred |
contact, inferred | Contact whose position is inferred |
detachment fault, approx. located | Detachment fault whose position is not precisely known |
detachment fault, certain | Observed detachment fault |
detachment fault, concealed | Concealed detachment fault whose position is inferred |
dike, approx. located | Dike whose position is not precisely known |
dike, certain | Observed dike |
dike, concealed | Concealed dike whose position is inferred |
fault, approx. located | Fault whose position is not precisely known |
fault, certain | Observed fault |
fault, concealed | Concealed fault whose position is inferred |
fault, concealed | Concealed fault whose position is inferred |
fault, inferred | Fault whose position is inferred |
fault, inferred, queried | Fault whose position is inferred and questionable |
map boundary, certain | Boundary of mapped area |
named fault | Fault that has been named |
reverse fault, approx. located | Reverse fault whose position is not precisely known |
reverse fault, concealed | Concealed reverse fault whose position is inferred |
scar, debris flow | Location of debris flow scar |
thrust fault, approx. located | Thrust fault whose position is not precisely known |
thrust fault, concealed | Concealed thrust fault whose position is inferred |
topographic, escarpment | Location of escarpment |
water boundary, certain | Boundary of body of water |
Value | Definition |
---|---|
f.a., anticline, approx. located | Anticlinal fold axis whose position is not precisely known |
f.a., anticline, concealed | Concealed anticlinal fold axis whose position is inferred |
f.a., anticline, inferred | Anticlinal fold axis whose position is inferred |
f.a., syncline, approx. located | Synclinal fold axis whose position is not precisely known |
f.a., syncline, concealed | Concealed synclinal fold axis whose position is inferred |
f.a., syncline, inferred | Synclinal fold axis whose position is inferred |
Value | Definition |
---|---|
bedding | Bedding orientation |
Range of values | |
---|---|
Minimum: | 57 |
Maximum: | 57 |
Units: | degrees |
Resolution: | 1 |
Range of values | |
---|---|
Minimum: | 299 |
Maximum: | 299 |
Units: | degrees |
Resolution: | 1 |
R. H. Campbell, Reston, VA assisted in field interpretations and compilation; P. K. Showalter and C. M. Wentworth supplied critical custom programming; and S. E. Graham updated supporting files for completeness and consistency and prepared this report.
650-329-4946 (voice)
ryerkes@usgs.gov
To provide to the public a digital geologic map database of the Point Dume 7.5' quadrangle.
Campbell, R. H., Blackerby, B. A., Yerkes, R. F., Schoellhamer, J. E., Birkeland, P. W., and Wentworth, C. M., 1996, Geologic map of the Point Dume quadrangle, Los Angeles County, California: U.S. Geological Survey Miscellaneous Investigations Series Map GQ-1747.
Complete
This digital map database is compiled from previously published sources combined with some new mapping and modifications in nomenclature. The geologic map database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U. S. Geological Survey. For detailed descriptions of the units, their stratigraphic relations and sources of geologic mapping consult Campbell et al. (1996). More specific information about the units may be available in the original sources.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints: none
1-888-ASK-USGS (voice)
1-303-202-4695 (FAX)
infoservices@usgs.gov
US Geological Survey Open-File Report 97-276
This report is preliminary and has not been reviewed for conformity with U. S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U. S. Government.
This database, identified as "Preliminary Geologic Map of the Point Dume 7.5' Quadrangle, southern California: A Digital Database," has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on condition that neither the USGS nor the U. S. Government may be held liable for any damages resulting from its use.
Data format: |
ARC/INFO export files Description of coverage pd-geol.e00 Depositional contacts, faults, and unit labels pd-strc.e00 Strike and dip information, fold axes pd-topo.e00 Topographic base map taken from a scan of a composite negative of the Point Dume 7.5 minute quadrangle (contour interval = 20 ft.)in format ArcInfo export (version 7.x) Size: 22.2 megabytes |
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Network links: |
<http://pubs.usgs.gov/of/1997/of97-276/ptdume.tar.gz> |
A compressed tar file of the geologic map database and related files can be obtained by sending a tape with request and return address to:
Point Dume, CA 7.5' Geologic Database c/o Database Coordinator US Geological Survey 345 Middlefield Road, M/S 975 Menlo Park, CA 94025Do not omit any part of this address!
The compressed tar file will be returned on the tape. The acceptable tape types are: 1/4 inch, 150 MB cartridge tape, 2.3 or 5.0 GB, 8 mm Exabyte tape.
703-648-6974 (voice)
703-648-6560 (FAX)
pschweitzer@usgs.gov