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Palm Spring Formation : ウィキペディア英語版 | Palm Spring Formation
The Palm Spring Formation is a Pleistocene Epoch geologic formation in the eastern Colorado Desert of Imperial County and San Diego County County, Southern California. ==Geology== The Palm Spring Formation is an extensively-exposed delta-plain deposit debouched by the ancestral Colorado River across the subsiding Salton Trough.〔(National Park Service: "The FISH CREEK CANYON ICHNOFAUNA: a PLIOCENE (BLANCAN) Vertebrate Footprint Assemblage from Anza-Borrego Desert State Park, California" ); by Paul Remeika.〕 It records the development of the prehistoric Colorado River delta cone into a barrier excluding marine waters from the Salton Trough.〔( San Diego State University.edu: "Environments of deposition, Pliocene Imperial Formation, Southeast Coyote Mountains, Imperial County, California" ); Bell, Patricia J.; 1980.〕
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