Astoria Formation

Astoria Formation
Stratigraphic range: Miocene
TypeGeological formation
Sub-unitsFrom top to bottom:
  • Big Creek sandstone member
  • Newport sandstone member
  • Silver Point mudstone member
  • Angora Peak sandstone member
UnderliesMontesano Formation
OverliesLincoln Creek Formation
Location
RegionWashington, Oregon
CountryUnited States

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).

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