Alsea Formation
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| Alsea Formation | |
|---|---|
| Stratigraphic range: Rupelian (Whitneyan) ~ | |
| Type | Formation |
| Underlies | Yaquina Formation |
| Lithology | |
| Primary | Siltstone |
| Other | Mudstone |
| Location | |
| Coordinates | 44°36′N 124°00′W / 44.6°N 124.0°W |
| Approximate paleocoordinates | 44°18′N 113°06′W / 44.3°N 113.1°W |
| Region | Lincoln County, Oregon |
| Country | United States |
  Alsea Formation (the United States)  Alsea Formation (Oregon) | |
The Alsea Formation is a geologic formation in Oregon. It preserves fossils dating back to the Rupelian stage of the Oligocene period.[1]