page_title: List of the Cenozoic life of Oregon
section_title: O
hierarchical_section_title: List of the Cenozoic life of Oregon / O
caption_attribution_description: English: American pika (Ochotona princeps) carrying flowers and grass to build its nest. Photo was taken on 24-07-2016 at Cawridge, Alberta (Canada).
context_page_description: This list of the Cenozoic life of Oregon contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Oregon and are between 66 million and 10,000 years of age.
context_section_description: †Ocajila
   Ochotona
  †Ochotona spanglei – type locality for species
  Ocotea
  †Ocotea ovoidea
  †Ocyplonessa
  †Ocyplonessa shotwelli – type locality for species
  †Odontocaryoidea
  †Odontocaryoidea nodulosa
  †Ogmophis – type locality for genus
  †Ogmophis oregonensis – type locality for species
  Olar
  †Olar buccinator
  †Olequahia
  †Olequahia schencki
  †Oligobunis
  Olivella
   †Olivella biplicata
  †Olivella mathewsonii
  †Olivella pedroana
  †Omsicarpium
  †Omsicarpium striatum
  Ondatra
  †Ondatra annectens – type locality for species
  Opalia
  †Opalia hertleini
  †Opalia williamsoni – or unidentified comparable form
  †Oregonomys
  †Oregonomys pebblespringsensis – type locality for species
  †Oregonomys sargenti
  †Oreodontoides
  †Oreodontoides oregonensis
  †Oreolagus
  †Oreolagus wallacei – type locality for species
  †Oryctoantiquus – type locality for genus
  †Oryctoantiquus borealis – type locality for species
  †Osbornodon
  †Osbornodon sesnoni
   †Osmunda
  †Osmunda occidentale
  Ostrea
  †Ostrea lurida – or unidentified comparable form
  Ostrya
  †Ostrya oregoniana
caption: A living Ochotona, or pika
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