Alluvial Fans of the Cucamonga District, Southern California

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Abstract
Along the south margin of the San Gabriel (California) mountain block alluvial fans have accumulated to a thickness of a thousand feet and more. The whole series of sediments is a unit, still growing, but chiefly of Pleistocene or earlier age. The fans are being dissected, with the formation of fanhead trenches and midfan mesas. The trenching of the fanheads is chiefly a normal, somewhat late feature of the fan development, though recent uplift, indicated by well-preserved fault scarps, has been a factor, and climatic changes may have contributed to the result. The midfan mesas may be the indirect result of faulting now obscured.

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