Twenty sq mi of Upper Cretaceous sedimentary rocks north of Ventura, Calif., were examined for sedimentary structures. On the basis of these features, Rust interprets the fine-grained deposits as deposition at considerable depth on a nearly level sea floor and the interbedded persistent conglomerates as deposition by mass movement into deep water spreading across the flat sea floor. Thus these sediments were chiefly transported and deposited by marine turbidity currents which varied considerably in scale.

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