Alsea Formation
# Alsea Formation

The Alsea Formation is a geologic formation in Oregon. It preserves fossils dating back to the Rupelian stage of the Oligocene period.

## Fossil content

The following fossils have been reported from the formation:

### Mammals

* Aetiocetus cotylalveus
* Maiabalaena nesbittae
* Simocetus rayi

### Fish

* Orthechinorhinus davidae
