title: Alsea Formation
text: # Alsea Formation
  
  The Alsea Formation is a geologic formation in Oregon. It preserves fossils dating back to the Rupelian stage of the Oligocene period.
  
  ## Fossil content
  
  The following fossils have been reported from the formation:
  
  ### Mammals
  
  * Aetiocetus cotylalveus
  * Maiabalaena nesbittae
  * Simocetus rayi
  
  ### Fish
  
  * Orthechinorhinus davidae
  