Abstract

Large boulders on alluvial fans are widely dispersed in the American Basin and Range province. The sizes of the more massive blocks have long intrigued regional geomorphologists, who have been hard pressed to account for their origin and presence on the fans. Herein I describe and illustrate several such boulders along the western side of the White Mountains, California, and offer an explanation for their areal distribution and method of transport. A novel approach to determination of earthquake frequency is also discussed, one based upon the proposition that megalith-like blocks and clusters of boulders on a fan represent, indirectly, the effects of energetic seismic events in or near the parent mountain range.

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