The Alsea Formation is a geologic formation in Oregon. It preserves fossils dating back to the Rupelian stage of the Oligocene period.Alsea Formation at Fossilworks.org
Fossil content The following fossils have been reported from the formation:
Mammals Aetiocetus cotylalveusDeméré & Berta, 2008 Maiabalaena nesbittaePeredo et al., 2018 Simocetus rayiFordyce, 2002
Fish Orthechinorhinus davidaeWelton, 2016
See also List of fossiliferous stratigraphic units in Oregon Paleontology in Oregon
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