Alsea Formation

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

Alsea Formation
Stratigraphic range: Rupelian (Whitneyan)
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TypeFormation
UnderliesYaquina Formation
Lithology
PrimarySiltstone
OtherMudstone
Location
Coordinates44.6°N 124.0°W / 44.6; -124.0
Approximate paleocoordinates44.3°N 113.1°W / 44.3; -113.1
RegionLincoln County, Oregon
Country United States
Alsea Formation (the United States)
Alsea Formation (Oregon)

Fossil content

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

Mammals

Fish
  • Orthechinorhinus davidae[5]

See also

References
  1. Alsea Formation at Fossilworks.org
  2. Deméré & Berta, 2008
  3. Peredo et al., 2018
  4. Fordyce, 2002
  5. Welton, 2016

Bibliography
  • Peredo, C. M.; N. D. Pyenson; C. D. Marshall, and M. D. Uhen. 2018. Tooth loss precedes the origin of baleen in whales. Current Biology 28. 1-9.
  • Welton, B. J. 2016. First report of Orthechinorhinus (Squaliformes: Etmopteriidae) from the Pacific Basin; A new species from Early Oligocene rocks of Oregon, USA. Fossil Record 5. 303–308.
  • Deméré, T. A., and A. Berta. 2008. Skull anatomy of the Oligocene toothed mysticete Aetiocetus weltoni (Mammalia; Cetacea): implications for mysticete evolution and functional anatomy. Zoological Journal of the Linnean Society 154. 308–352.
  • Fordyce, R. E. 2002. Simocetus rayi (Odontoceti, Simocetidae, new family); a bizarre new archaic Oligocene dolphin from the eastern North Pacific. Smithsonian Contributions to Paleobiology 93. 185–222.
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