Pliocene Deposits North of Simi Valley, California

Abstract

The youngest Tertiary rocks on the south slope of the Santa Susana Mountains north of Simi Valley, in eastern Ventura and western Los Angeles counties, consist of sandstones and conglomerates that lie unconformably on beds ranging in age from upper Miocene to Eocene. Though they are the youngest consolidated deposits in this region, they embrace rocks that are far harder than any of the other Tertiary rocks; they cap high ridges and supply the most durable rock waste to the streams.

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