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San Bernardino Mountains

Oblique aerial photograph looking northeast toward the San Bernardino Mountains and part of the San Bernardino Basin, southern California. The modern trace of the San Andreas Fault lies along the base of the mountains, along with an older, concealed trace of the San Andreas that has considerable right-lateral displacement over the last 4 to 5 million years (Matti and Morton, 1993). Lowlands of the San Bernardino Basin are filled with sand and gravel derived from surrounding highlands over the last several million years. These deposits are burying underlying basement rocks of San Gabriel Mountains type, a few inselbergs or "island mountains" of which poke up above the valley surface (for example, Perris Hill, in the lower right part of the photograph). Rocks of this type completely underlie all of the sand and gravel deposited in the San Bernardino Basin, and form a "basement" foundation for the overlying sedimentary materials. Other features include: SG, San Gorgonio Mountain; MC, Mill Creek Strand of the San Andreas Fault; RS, Running Springs; BF, Barton Flat.

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This site last updated September 3, 2004 (ps)

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