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The AAPG/Datapages Combined Publications Database

Pacific Section of AAPG

Abstract


Geologic Guide to the San Onofre Nuclear Generating Station and Adjacent Regions of So. California, 1979
Pages A-63-A-70

Late Pleistocene Channel of the Lower Santa Margarita River San Diego County, California

Roy J. Shlemon

Abstract

A buried channel gravel underlying the lower Santa Margarita River is traced to a depth of approximately 50 m below sea level at the present coastline. The channel was probably cut and filled during the late Pleistocene, glacioeustatic low stand of sea level (“late Wisconsinan”), some 17,000 to 20,000 years ago. Overlying fine-grained sediments were laid down mainly during the last deglacial rise in sea level (Flandrian transgression) between about 15,000 and 5,000 years ago. The basal channel and overlying fine-grained sequence form a broad mega-fining-upward depositional cycle useful for reconstructing late Pleistocene-Holocene landscape evolution in this part of California.


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