Alsea Formation Explained

Alsea Formation
Type:	Formation
Age:	Rupelian (Whitneyan) ~
Period:	Rupelian
Prilithology:	Siltstone
Otherlithology:	Mudstone
Region:	Lincoln County, Oregon
Coordinates:	44.6°N -124°W
Paleocoordinates:	44.3°N -113.1°W
Underlies:	Yaquina Formation

The Alsea Formation is a geologic formation in Oregon. It preserves fossils dating back to the Rupelian stage of the Oligocene period.^[1]

Fossil content

The following fossils have been reported from the formation:^[1]

Mammals

• Aetiocetus cotylalveus^[2]
• Maiabalaena nesbittae^[3]
• Simocetus rayi^[4]

Fish

• Orthechinorhinus davidae^[5]

See also

• List of fossiliferous stratigraphic units in Oregon
• Paleontology in Oregon

References

Bibliography

Notes and References

1. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayStrata&geological_group=&formation=Alsea&group_formation_member=Alsea Alsea Formation
2. Deméré & Berta, 2008
3. Peredo et al., 2018
4. Fordyce, 2002
5. Welton, 2016