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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

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