Introduction Open-File Report 03-418 is a digital geologic data set that maps and describes the geology of the Fontana 7.5’ quadrangle, Riverside and San Bernardino Counties, California. The Fontana quadrangle database is one of several 7.5’ quadrangle databases that are being produced by the Southern California Areal Mapping Project (SCAMP). These maps and databases are, in turn, part of the nation-wide digital geologic map coverage being developed by the National Cooperative Geologic Map Program of the U.S. Geological Survey (USGS). General Open-File Report 03-418 contains a digital geologic map database of the Fontana 7.5’ quadrangle, Riverside and San Bernardino Counties, California that includes: 1. ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 7.2.1 coverages of the various elements of the geologic map. 2. A Postscript file (fon_map.ps) to plot the geologic map on a topographic base, and containing a Correlation of Map Units diagram (CMU), a Description of Map Units (DMU), and an index map. 3. An Encapsulated PostScript (EPS) file (fon_grey.eps) created in Adobe Illustrator 10.0 to plot the geologic map on a grey topographic base, and containing a Correlation of Map Units (CMU), a Description of Map Units (DMU), and an index map. 4. Portable Document Format (.pdf) files of: a. the Readme file; includes in Appendix I, data contained in fon_met.txt b. The same graphics as plotted in 2 and 3 above.Test plots have not produced precise 1:24,000-scale map sheets. Adobe Acrobat page size setting influences map scale. 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. Where known, grain size is
indicated on the map by a subscripted letter or letters following the
unit symbols as follows: lg, large boulders; b, boulder; g, gravel; a,
arenaceous; s, silt; c, clay; e.g. Qyfa is a predominantly young alluvial
fan deposit that is arenaceous. Multiple letters are used for more specific
identification or for mixed units, e.g., Qfysa is a silty sand. In some
cases, mixed units are indicated by a compound symbol; e.g., Qyf2sc. 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 (4b above) or plotting the postscript
files (2 or 3 above). |
Learn more about the Fontana data set and its contents
![]() |
This illustration is a .gif (GIF) non-navigable image of
the USGS geologic-map plot of the Fontana quadrangle |
File Name |
File Type and Description |
File Size |
|
README's and METADATA |
|||
Text version of readme file that explains how to use the digital database | 44 Kb |
||
PDF version of the readme file that explains how to use the digital database. | 404 Kb |
||
Text file of the FGDC-compliant metadata | 28 Kb |
||
DATA |
|||
Compressed tar file of the digital database for this map | 1.9 MB |
||
FILES for VIEWING and PLOTTING |
|||
fon_map.ps.gz | Compressed (gzip) PostScript file used for plotting a paper copy of the map with a black topographic base | 2.2 MB |
|
fon_grey.eps.gz | Encapsulated PostScript plot file of geologic map on a grey topographic base | 4.3 MB |
|
Shade, line, and marker sets used to produce
an optimum plot |
184 Kb |
||
fon_grey.pdf | PDF file of map sheet that can be used for viewing map in a browser, as well as for plotting on a grey topographic base | 3.5 MB |
|
PDF file of map sheet that can be used for viewing map in a browser, as well as for plotting on a black topographic base | 3 MB |
For questions about the content of this report, contact Doug Morton
Download a current version of Acrobat Reader for free
| Help | PDF help | Geopubs main page | Open-File Reports for 2003 |
| Privacy Statement | Disclaimer | Accessibility |
| Geologic Division | Earth Surface Processes |
This report is available only on the Web