page_title: List of the Paleozoic life of California
section_title: O
hierarchical_section_title: List of the Paleozoic life of California / O
caption_attribution_description: English: An Olenellus clarki trilobite, Order Redlichiida, Family Olenellidae, 37mm measured along the axis, collected from the Latham Shale, California, USA, from the Lower Cambrian (Toyonian)
context_page_description: This list of the Paleozoic life of California contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of California and are between 541 and 252.17 million years of age.
context_section_description: †Obolella
  †OIenellus
  †OIenellus gilberti
    †Olenellus
  †Olenellus arcuatus
  †Olenellus clarki
  †Olenellus cylindricus
  †Olenellus euryparia
  †Olenellus fowleri – or unidentified comparable form
  †Olenellus frementi
  †Olenellus fremonti
  †Olenellus gilberti
  †Olenellus howelli
  †Olenellus multinodus
  †Olenellus nevadensis
  †Olenellus puertoblancoensis
  †Olenellus terminatus
  †Olenellus transifans – or unidentified comparable form
  †Olenellus transiftans – or unidentified comparable form
  †Olenellus transitans – or unidentified comparable form
  †Olenellus turmalis – or unidentified comparable form
  †Omphalotrochus
  †Omphalotrochus whitneyi – type locality for species
  †Onchocephalites
  †Onchocephalites claytonensis – type locality for species
  †Onchocephalites laevis
  †Ophiletina
  †Ophiletina sublaxa – or unidentified related form
  †Orbiculoidea
  †Orbiculoidea damanensis
  †Orthambonites
  †Orthambonites decipiens
  †Orthambonites eucharis
  †Orthambonites mazousbensis
  †Orthambonites minisculus
  †Orthambonites minusculus
  †Orthambonites patulus
  †Orthidiella
  †Orthidiella extensa
  †Orthophyllum – tentative report
  †Orthotetes
  †Orthotichia
  †Orthotichia nawtawaketensis
  †Oryctocephalites
  †Oryctocephalites resseri
  †Oryctocephalus
  †Oryctocephalus indicus
  †Oryctocephalus nyensis
  †Oryctocephalus orientalis
  †Ovatia
caption: Illustration of a fossil of the Cambrian trilobite Olenellus
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