Possible Emplacement History of a Sandblow Structure at Pallett Creek, California

Abstract

Detailed study of a pre-historic sandblow structure at Pallett Creek, California, indicates a complicated and enigmatic history of development. The sandblow feature is located four meters west of the main trace of the San Andreas fault in a late Holocene section of peat and fluvial silt, sand and gravel (in exposure 5 Fig. 3, previous article, this volume). Elsewhere at the site, the strata containing the sandblow are characterized by minor faulting, disruption of the pre-historic surficial layer, and other liquefaction features which are interpreted by Sieh (1978) as evidence of a major earthquake in the 7th-century A.D.

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