Abstract
Samples of diatomaceous sedimentary rock from the Oregon continental shelf appear to have come from a definable stratigraphic unit. This unit may be, in part, a correlative of the Pullen Formation of northern California. Diatoms and silicoflagellates from the offshore rock unit suggest a Delmontian (late Miocene) age. This occurrence of diatomaceous upper Miocene rock on the Oregon shelf adds to the growing list of such occurrences in the upper Miocene around the Pacific.
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