Astoria Formation

The Astoria Formation is a geologic formation in Washington state & Oregon. It preserves fossils dating back to the early to middle Miocene.

Description

The Astoria Formation is a thick marine formation representing a near shore, relatively shallow-water shelf deposit. The formation spans a considerable amount of time, with its base considered to be lower boundary of Newportian Stage & its top to be upper boundary of Newportian Stage.

Fossil content

Mammals

Carnivorans

Cetaceans

Perissodactyls

Birds

Cartilaginous fish