page_title: List of the Cenozoic life of Colorado
section_title: O
hierarchical_section_title: List of the Cenozoic life of Colorado / O
caption_attribution_description: English: Crop of file in filename
context_page_description: This list of the Cenozoic life of Colorado contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Colorado and are between 66 million and 10,000 years of age.
context_section_description: Ochotona
  †Ochotona princeps
  †Ocymoromelitta – type locality for genus
  †Ocymoromelitta florissantella – type locality for species
  †Ocymoromelitta miocenica – type locality for species
  †Ocymoromelitta sorella – type locality for species
  †Odaxosaurus – or unidentified comparable form
  †Odaxosaurus piger
  Odocoileus
   †Odocoileus hemionus
  †Odynerus
  †Odynerus palaeophilus – type locality for species
  †Odynerus percontusus – type locality for species
  †Odynerus praesepultus – type locality for species
  †Odynerus terryi – type locality for species
  †Odynerus wilmattae – type locality for species
  †Oedipoda
  †Oedipoda praefocata – type locality for species
  †Ogygoptynx – type locality for genus
  †Ogygoptynx wetmorei – type locality for species
  †Olbiogaster
  †Olbiogaster simplex – type locality for species
  †Oligaeschna
  †Oligaeschna lapidaria – type locality for species
  †Oligaeschna separata – type locality for species
  †Oligoaeschna – type locality for genus
  †Oligoaeschna needhami – type locality for species
  †Oligobruchus
  †Oligobruchus florissantensis – type locality for species
  †Oligobruchus haywardi – type locality for species
  †Oligobruchus primoticus – type locality for species
  †Oligobruchus scudderi – type locality for species
  †Oligobruchus submersus – type locality for species
  †Oligobruchus wilsoni – type locality for species
  †Oligocryptus – type locality for genus
  †Oligocryptus sectus – type locality for species
  †Oligodonta – type locality for genus
  †Oligodonta florissantensis – type locality for species
   †Oligomerus
  †Oligomerus breviusculus – type locality for species
  †Oligomerus duratus – type locality for species
  †Oligomerus florissantensis – type locality for species
  †Oligomyotis
  †Oligomyotis casementi
  †Oligoneuroides – type locality for genus
  †Oligoneuroides destructus – type locality for species
  †Oligoryctes
  †Oligoscalops
  †Oligoscalops galbreathi
  †Oligotricha
  †Oligotricha evanescens – type locality for species
  †Ologlyptus
  †Ologlyptus primus – type locality for species
  Olophrum
  †Olophrum boreale
  †Olophrum obtectum
  Omalium
  †Omalium antiquorum – type locality for species
  †Omileus
  †Omileus evanidus – type locality for species
  †Omomys
  †Omomys carteri
  Omus
  †Omus audouini
   Ondatra
  †Ondatra annectens
  †Oodectes
  †Oodectes herpestoides
  Ophisaurus
  Ophryastes
  †Ophryastes championi
  †Ophryastes grandis – type locality for species
  †Ophryastes petrarum
  †Ophryastites
  †Ophryastites absconsus – type locality for species
  †Ophryastites cinereus – type locality for species
  †Ophryastites dispertitus – type locality for species
  †Ophryastites hendersoni – type locality for species
  †Ophryastites miocenus – type locality for species
  †Ophyra
  †Ophyra vetusta – type locality for species
  †Opisthotriton
  †Opisthotriton kayi – or unidentified comparable form
  †Orchelimum
  †Orchelimum placidum – type locality for species
  Orchestes
  †Orchestes languidulus – type locality for species
  Oreamnos – or unidentified comparable form
   †Oreamnos harringtoni
  †Oreolagus
  †Oreolagus wilsoni – type locality for species
  †Oreopanax
  †Oreopanax dissecta
  †Oreopanax elongatum – type locality for species
  †Oreotalpa – type locality for genus
  †Oreotalpa florissantensis – type locality for species
  †Ormyrodes
  †Ormyrodes petrefactus – type locality for species
  †Orohippus
  †Orohippus sylvaticus
  †Oromeryx
   †Orontium
  †Orontium fossile
  †Orphilus
  †Orphilus dubius
  †Orthocentrus
  †Orthocentrus defossus – type locality for species
  †Orthocentrus primus – type locality for species
  †Orthriocorisa – type locality for genus
  †Orthriocorisa longipes – type locality for species
  †Oryctogma – type locality for genus
  †Oryctogma sackenii – type locality for species
  †Oryctorhinus – type locality for genus
  †Oryctorhinus tenuirostris – type locality for species
  †Oryctoscirtetes – type locality for genus
  †Oryctoscirtetes protogaeum – type locality for species
  †Osmanthus
  †Osmanthus praemissa
   †Osmunda
  †Osmunda greenlandica
  †Osmylidia
  †Osmylidia requieta – type locality for species
  †Otiorhynchites
  †Otiorhynchites absentivus – type locality for species
  †Otiorhynchites commutatus – type locality for species
  †Otiorhynchites fl
caption: Life restoration of the Paleocene-Eocene creodont mammal Oxyaena
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