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Fig. 8. Spatial extent of soil thickness in California derived from the USDA-NRCS State Soil Geographic Database (STATSGO). Regions identified in black depict areas where the depth to bedrock of dominant soil components of map units is within 1.5 m of the soil surface. Regions in white represent dominant soil components of map units where the depth to bedrock is >1.5 m. (Courtesy of Dr. Anthony T. O'Geen, Dep. Land, Air, and Water Resources, University of California, Davis, CA.)
