GEOLOGIC MAP OF THE VALJEAN HILLS 7.5' QUADRANGLE, SAN BERNARDINO COUNTY, CALIFORNIA By J.P. Calzia and B.W. Troxel Digital database by Christian Raumann Open-File Report OF 03-096 2003 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 "Geologic map of the Valjean Hills 7.5' quadrangle, San Bernardino County, California" has been approved for release and publication by the Director of the USGS. U.S. DEPARTMENT OF INTERIOR U.S. GEOLOGICAL SURVEY U.S. Geological Survey 345 Middlefield Road, MS-531 Menlo Park, CA 94025 TABLE OF CONTENTS INTRODUCTION General HOW TO OBTAIN PAPER PLOTS DATABASE CONTENTS Data package Plot package DIGITAL GEOLOGIC MAP SPECIFICATIONS Digital compilation Spatial resolution Map accuracy standards Faults and landslides Database specifics Lines Polygons Points REFERENCES INTRODUCTION General Open-File Report 03-096 contains a digital geologic map database of the Valjean Hills 7.5' quadrangle, San Bernardino Counties, California that includes: 1. ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 8.2 coverages of the various elements of the geologic map. valjean_geo.e00 valjean_str.e00 2. A Postscript file to plot the geologic map, and containing a Correlation of Map Units diagram (CMU), a Description of Map Units (DMU), and an index map. valjean_geomap.zip 3. Portable Document Format (.pdf) files of the same graphic as plotted in 2 above. Test plots have not produced precise 1:24,000-scale map sheets. Adobe Acrobat page size setting influences map scale. valjean_geomap.pdf 4. Text file of FGDC-compliant metadata. valjean_meta.txt 5. This "read me" text description. 01README_of03_096.txt The Correlation of Map Units and Description of Map Units is in the editorial format of USGS Geologic Investigations Series (I-series) maps but has not been edited to comply with I-map standards. Within the geologic map data package, map units are identified by standard geologic map criteria such as formation-name, age, and lithology. Even though this is an Open-File Report and includes the standard USGS Open-File disclaimer, the report closely adheres to the stratigraphic nomenclature of the U.S. Geological Survey. Descriptions of units can be obtained by viewing or plotting the .pdf file (3 above) or plotting the postscript file (2 above). HOW TO OBTAIN PAPER PLOTS For those having access to large-format plotters such as HP650C, HP755C, and HP2500C, plots may be made directly from the included plot file. DATABASE CONTENTS The files constituting the geologic map database of this Open-File Report are listed below along with the interchange files from which they were extracted. Data Package ARC/INFO interchange files Valjean Hills coverages Contains valjean_geo.e00 valjean_geo Contacts, faults, geologic unit labels valjean_str.e00 valjean_str Attitudes and their strike and dip values. Also, supplementary faults. Plot Package Compressed file Resultant image Contains valjean_geomap.zip valjean_geomap.eps PostScript plot file of geologic map and CMU/DMU The Postscript file is compressed using winzip. The uncompressed Postscript file crn_map.ps will plot a 1:24,000 scale, full color geologic map of the Valjean Hills quadrangle on the topographic base. A detailed CMU diagram, a DMU are included on the sheet. The sheet is in the editorial format of the U.S. Geological Survey's Geologic Investigations (I) map series. DIGITAL GEOLOGIC MAP SPECIFICATIONS Digital compilation The geologic map information was hand digitized from a base-stable original (ink on a greenline) of the geologic map at 1:24,000 scale. Digital tics were placed by hand at latitude/longitude intersections. The lines, points, and polygons were edited using ARC/INFO 8.2. Spatial resolution Use of this digital geologic map database should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited at a scale of 1:24,000 means that higher resolution information is not generally present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities above the intended resolution of the database. Similarly, although higher resolution data is incorporated at a few places, the resolution of the combined output will be limited by the lower resolution data. Map accuracy standards Until uniform National geologic map standards are developed and adopted, lines and points on SCAMP 1:24,000 scale geologic maps that are located to within 15 meters, relative to accurately located features on the base map, are considered to meet map accuracy standards. Dashed lines, indicated in the database as approximately located or inferred, are generally located within 30 meters, relative to accurately located features on the base map. Faults and landslides This database is sufficiently detailed to identify and characterize many actual and potential geologic hazards represented by faults and landslides, but it is not sufficiently detailed for site-specific determinations. Database specifics The content of the geologic database can be described in terms of feature classes that include lines, points, and areas that compose the map. See the metadata text file (valjean_meta.txt) for detailed descriptions. Lines - Lines are recorded as strings of arcs and are described in an arc attribute (.aat) table as LTYPE. They represent contacts and faults, which define the boundaries of map units and map boundaries. Polygons --- Geologic map units (polygons) are described in the polygon attribute (.pat) table as PTYPE. For traditional descriptions of the map units, see the Portable Document Format file crn_map.pdf (valjean_geomap.pdf) or Postscript map plot (valjean_geomap.eps). Points - Point information (attitudes of planar and linear features) is recorded as coordinate and related information. REFERENCES Calzia, J.P., 1990, Geologic studies of the Kinsgston Range, southern Death Valley, California: Davis, University of California, PhD dissertation, 230 p. Calzia, J.P., Troxel, B.W., Wright, L.A., Burchfiel, B.C., Davis, G.A., and McMackin, M.R., 2000, Geologic map of the Kingston Range, southern Death Valley, California: U.S. Geological Survey Open-File Report 00-412, scale 1:31,680 Fowler, T.K., 1992, Geology of Shadow Mountain and the Shadow Valley Basin: Implications for Tertiary tectonics of the eastern Mojave Desert: University of Southern California PhD dissertation, 160 p. Heassler, M.J., and Friend, L.D., 1986, Geology of the Valjean Hills, southeastern Death Valley region, San Bernardino County, California: California State University, Sonoma, senior thesis, 56 Mason, J.F., 1948, Geology of the Tecopa area, southeastern California: Geological Society of America Bulletin, v. 59, p. 333-352 Scott, R.K., Wright, L.A., and Drake, R.E., 1986, Thrust fault-related monolithologic breccias and cyclic playa-lake deposits in the Miocene China Ranch basin, Death Valley region, California: Geological Society of America Abstracts with Program, v. 20, p. 229.