The underlying material is nonmarine sedimentary rock, (weathered from shale, sandstone, and calcified weathered granite) deposited from the San Gabriel and San Bernardino Mountains as recently as 0.7 million years ago (National Cooperative Soil Survey). Surface soil is described as young alluvial fan deposits, well-drained, course, loamy, with a pH of 8.2 (USGS).
090-P79135 San Timoteo Canyon Park Property © 2012, California State Parks. Photo by Brian Baer.
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