The Alsea Formation is a
geologic formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...
in
Oregon
Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...
. It preserves
fossils
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...
dating back to the
Rupelian stage of the
Oligocene
The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the ...
period.
[Alsea Formation]
at Fossilworks
Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database
The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...
.org
Fossil content
The following fossils have been reported from the formation:
[
]
Mammals
* ''Aetiocetus cotylalveus
''Aetiocetus'' is a genus of extinct basal mysticete, or baleen whale that lived , in the Oligocene in the North Pacific ocean, around Japan, Mexico, and Oregon, U.S. It was first described by Douglas Emlong in 1966 and currently contains kn ...
''[Deméré & Berta, 2008]
* '' Maiabalaena nesbittae''[Peredo et al., 2018]
* '' Simocetus rayi''[Fordyce, 2002]
Fish
* '' Orthechinorhinus davidae''[Welton, 2016]
See also
* List of fossiliferous stratigraphic units in Oregon
This article contains a list of fossil-bearing stratigraphic units in the state of Oregon, Oregon, U.S.
Lists of fossiliferous stratigraphic units Cenozoic
Mesozoic
Paleozoic
See also
* Paleontology in Oregon
* Lists of Oregon- ...
* Paleontology in Oregon The location of the state of Oregon
Paleontology in Oregon refers to paleontological research occurring within or conducted by people from the U.S. state of Oregon. Oregon's geologic record extends back approximately 400 million years ago to the ...
References
Bibliography
*
*
*
* {{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
Paleogene geology of Oregon
Oligocene Series of North America
Rupelian Stage
Whitneyan
Siltstone formations
Mudstone formations
Shallow marine deposits
Paleontology in Oregon
Formations