Alsea Formation
{{Short description|Geologic formation in Oregon, United States}}
{{Infobox rockunit
| name = Alsea Formation
| image =
| caption =
| type = Formation
| age = Rupelian (Whitneyan)
~{{fossil range|33.7|30.6}}
| period = Rupelian
| prilithology = Siltstone
| otherlithology = Mudstone
| namedfor =
| namedby =
| year_ts =
| region = Lincoln County, Oregon
| country = {{USA}}
| coordinates = {{coord|44.6|N|124.0|W|display=inline,title}}
| paleocoordinates = {{coord|44.3|N|113.1|W|display=inline}}
| unitof =
| subunits =
| underlies = Yaquina Formation
| overlies =
| thickness =
| extent =
| area =
| map = {{Location map+ | United States#Oregon
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | United States#Oregon
| lat_deg = 44.6
| lon_deg = -124.0
| mark = Orange ff8040 pog.svg
| marksize = 12
}}
}}
| map_caption =
}}
The Alsea Formation is a geologic formation in Oregon. It preserves fossils dating back to the Rupelian stage of the Oligocene period.[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Alsea&group_formation_member=Alsea Alsea Formation] at Fossilworks.org
Fossil content
= Mammals =
= Fish =
See also
References
{{reflist|3}}
= Bibliography =
- {{citation |last1=Peredo |first1=C. M. |first2=N. D.|author2-link=Nicholas Pyenson |last2=Pyenson |first3=C. D. |last3=Marshall |first4=M. D. |last4=Uhen |year=2018 |title=Tooth loss precedes the origin of baleen in whales |journal=Current Biology |volume=28 |issue=24 |pages=1–9|doi=10.1016/j.cub.2018.10.047 |pmid=30503622 |bibcode=2018CBio...28E3992P }}
- {{citation |last=Welton |first=B. J |year=2016 |title=First report of Orthechinorhinus (Squaliformes: Etmopteriidae) from the Pacific Basin; A new species from Early Oligocene rocks of Oregon, USA |journal=Fossil Record |volume=5 |pages=303–308}}
- {{citation |last1=Deméré |first1=T. A. |first2=A. |last2=Berta |year=2008 |title=Skull anatomy of the Oligocene toothed mysticete Aetiocetus weltoni (Mammalia; Cetacea): implications for mysticete evolution and functional anatomy |journal=Zoological Journal of the Linnean Society |volume=154 |issue=2 |pages=308–352|doi=10.1111/j.1096-3642.2008.00414.x }}
- {{citation |last=Fordyce |first=R. E |year=2002 |title=Simocetus rayi (Odontoceti, Simocetidae, new family); a bizarre new archaic Oligocene dolphin from the eastern North Pacific |journal=Smithsonian Contributions to Paleobiology |volume=93 |pages=185–222|doi=10.5479/si.00810266.93.185 |url=https://www.biodiversitylibrary.org/part/352095 }}
Category:Paleogene geology of Oregon
Category:Oligocene Series of North America
Category:Shallow marine deposits