Please Note: This is an archived website. It is recommended to search on-line for revised or newer information.
Link to USGS Home Page CGS home USGS home


Find Geologic Maps


Southern California Geology

Links and Resources

Site Contents

Contact Us

Southern California Geology

Geologic Setting of the Transverse Ranges Province

San Bernardino Mountains

Geologic Setting Between the Mission Creek and Wilson Creek Strands, San Andreas Fault

The Mission Creek strand and Wilson Creek strand of the San Andreas Fault bound a narrow slice of crystalline basement rocks and overlying Tertiary sedimentary rocks (index map). The crystalline rocks mainly are gneissose to foliated granodiorite that is associated with texturally massive dioritic to monzogranitic plutonic rock (Matti and others, 1983a, 1992b). These rocks locally are overlain unconformably by upper Cenozoic nonmarine sandstone and conglomerate of the Mill Creek Formation (of Gibson, 1964, 1971, as used by Matti and others, 1992b). The sedimentary rocks are well exposed along both sides of State Highway 38 in Mill Creek Canyon just upstream from the San Bernardino National Forest Mill Creek Ranger Station.

As with rocks outboard (southwest) of the Mission Creek strand, rocks outboard of the Wilson Creek strand are not native to the San Bernardino Mountains. They are generally similar to rocks in the Little San Bernardino Mountains, and appear to have been faulted against the San Bernardino Mountains by about 40 to 50 km of displacement on the Wilson Creek and Mill Creek strands of the San Andreas Fault (Matti and Morton, 1993; but see different interpretations by Hillenbrand, 1990, and Sadler and others, 1993).

Continue to Geologic Setting East of the San Andreas Fault Zone

Selected References

Return to Transverse Ranges Province

Return to Geologic Setting and Geologic History

Return to Southern California Geology

blue line
Southern California Areal Mapping Project logo
SCAMP Home Page
USGS Geology, Minerals, Energy, and Geophysics
California Geological Survey
USGS Home || Search USGS

blue line

  U.S. Department of the Interior, U.S. Geological Survey
Maintainer: WESP team webmaster contact
Privacy Statement || Disclaimer || Accessibility
This site last updated September 3, 2004 (ps)

First Gov