- Source: Astoria Formation
The Astoria Formation (formerly known as the Astoria shales) is a geologic formation in Washington state & Oregon. It preserves fossils dating back to the early to middle Miocene (but was formerly thought to date to the Oligocene).
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 (late Early Miocene) & its top to be upper boundary of Newportian Stage (middle Middle Miocene).
Fossil content
= Mammals
=Carnivorans
Cetaceans
Perissodactyls
= Birds
== Cartilaginous fish
=See also
List of fossiliferous stratigraphic units in Oregon
Paleontology in Washington (state)
List of fossiliferous stratigraphic units in Washington
Paleontology in Oregon
References
Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
Moore, E. (1963). "Miocene marine mollusks from the Astoria formation in Oregon". Professional Paper. doi:10.3133/PP419. S2CID 127613845. {{cite book}}: Missing or empty |title= (help)
"Stratigraphy and sedimentation of the Onion Peak area, Clatsop County, Oregon". 1974. {{cite journal}}: Cite journal requires |journal= (help)