Western Earth Surface Processes

U.S. Geological Survey
Open-File Report 2006-1217
Version 1.0

Geologic Map of the San Bernardino and Santa Ana 30' x 60' quadrangles, California

By Douglas M. Morton and Fred K. Miller
Digital preparation by Pamela M. Cossette and Kelly R. Bovard

thumbnail view of map

The area covered by the combined Santa Ana and San Bernardino 30' x 60' quadrangles includes highly diverse geologic, physical, and climatic features. Topographic relief ranges from subsea to rugged mountains reaching elevations of more than 3,000 m, and includes large areas of low relief that are largely urbanized. Climatic variations include moderate coastal, cool mountain, and hot desert. Having a current population exceeding five million people, much of the quadrangles are densely populated metropolitan areas and rapidly urbanizing areas, but they also encompass large tracts of undeveloped land and even remote wilderness areas.

Included in the two quadrangles is some of the most varied and complex geology in the western United States. Parts of three major physiographic provinces fall within the area, the Peninsular Ranges, Transverse Ranges, and Mojave Desert provinces, in addition to four herein informally designated basement rock assemblages, the San Gabriel Mountains, San Bernardino Mountains, Mill Creek, and Peninsular Ranges assemblages (figs. 1 and 2). Bounding and falling within these basement rock assemblages are elements of several seismically active fault zones, including the San Andreas, San Jacinto, Elsinore, Whittier, Cucamonga, and Sierra Madre Faults.


This comprehensive publication pamphlet contains a detailed Description of Map Units (DMU), and a discussion of the regional geologic framework. It is provided here in two forms, one without photographs and a larger collection of files that includes links to images of many exemplary rock unit outcrops and geologic features. The first file can be using the link below. The second file must be downloaded to your hard disc, expanded, and viewed offline.

Download pamphlet without photos as a PDF file (of2006-1217_pamphlet_nophotos.pdf; 2 MB)

Download pamphlet with 588 photos as a compressed ZIP file (of2006-1217_pamphlet_photos.zip; 153 MB that opens into a 156-MB folder)


Four sheets are included in this report:
Sheet 1 (of2006-1217_geol_map.pdf; 37.6 MB) is the geologic map;
Sheet 2 (of2006-1217_major_flts.pdf; 18 MB), a fault map;
Sheet 3 (of2006-1217_young_flts.pdf; 24 MB), faults that cut late Pleistocene and Holocene deposits, and
Sheet 4 (of2006-1217_cmu.pdf; 1.1 MB), correlation of map units. In addition to the four map sheets, the report includes five figures.
Figures 1 and 2 (of2006-1217_fig1_and_2.pdf; 912 KB): Figure 1 shows the location of most place names used in descriptive parts of the report. Figure 2 is a highly simplified diagram showing the location of the two quadrangles relative to physiographic provinces of southern California.
Figure 3 (of2006-1217_fig3.pdf; 538 KB) shows the location of the major physiographic features including definable structural blocks having internally consistant characteristics.
Figure 4 (of2006-1217_fig4.pdf; 592 KB) shows sources of geologic mapping used to compile the geologic map and digital database. In this figure, published and unpublished mapping by the compilation authors are distinguished from published and unpublished mapping by others, in addition to showing where work by more than one person overlaps. References for published mapping are given; information for unpublished mapping includes the year(s) the mapping was done, the scale at which it was done, and the individual(s) who did the mapping.
Figure 5 (of2006-1217_fig5.pdf; 1.6 MB) shows the historic lake levels of Mystic Lake and a projection of where the lake level (closed depression) is predicted to be in 2023.


Download the Readme file for this report as a PDF file (of2006-1217_readme.pdf; 64 KB)

Download the metadata for this report as an ASCII file. This is a text file of FGDC-compliant metadata for this report (sasb_metadata.txt; 176 kB).

sasb_geodatabase.zip Geodatabase package (332.5 MB; expands to 575.7 MB).

sasb_shapefiles.zip Shapefile package (198 MB; expands to 487 MB).

sasb_interchange_files.zip Coverage data model interchange (.e00) files (98.6 MB; expands to 422.1 MB).

symbols.zip This folder is included for those who continue to use ESRI's coverage data model: that symbology is not readable by ArcGIS 9x. However, sasb1d.style is included in the symbols folder for use with ArcGIS9x. (312 KB; expands to 3.5 MB).

For questions about the content of this report, contact Doug Morton .

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