page_title: List of the Mesozoic life of Arizona
section_title: A
hierarchical_section_title: List of the Mesozoic life of Arizona / A
caption_attribution_description: English: Fossil Araucarioxylon arizonicum (petrified wood) outside the National Museum of Natural History, USA, in Washington, DC, USA.
context_page_description: This list of the Mesozoic life of Arizona contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arizona and are between 252.17 and 66 million years of age.
context_section_description: †Acaenasuchus – type locality for genus
  †Acaenasuchus geoffreyi – type locality for species
  †Acallosuchus – type locality for genus
  †Acallosuchus rectori – type locality for species
   †Acanthohoplites
  †Acanthohoplites berkeyi
  †Acanthohoplites erraticus
  †Acanthohoplites hesper
  †Acanthohoplites impetrabilis
  †Acanthohoplites schucherti
  †Acanthohoplites teres
  Acila
  †Acila schencki
  Acirsa
  †Acirsa kelseyi – type locality for species
  Acmaea
  †Acrodus
  † Acteon
  †Acteon propinguis
  †Actinastrea
  †Adamanasuchus – type locality for genus
  †Adamanasuchus eisenhardtae – type locality for species
  †Admetopsis
  †Admetopsis subfusiformis
  †Adocus
   †Allocrioceras
  †Allocrioceras annulatum
  †Alzadites
  †Alzadites incomptus
  †Ambrosea
  †Ambrosea nitida
  †Ammorhynchus – type locality for genus
  †Ammorhynchus navajoi – type locality for species
  †Anaschisma – report made of unidentified related form or using admittedly obsolete nomenclature
  †Anatimya
  †Anatimya virgata
  †Anchura
  †Anchura hopii – type locality for species
   †Angistorhinus – tentative report
  †Anisoceras
  †Anisoceras coloradoense
  †Anisodontosaurus – type locality for genus
  †Anisodontosaurus greeri – type locality for species
  †Anisomyon
  †Anisomyon spp.
  † Anomia
  †Anomia ponticulana
  †Antediplodon
  †Antediplodon dockumensis
  †Apachesaurus
  †Apachesaurus gregorii
  †Apatosaurus
  †Aphrodina
  †Aphrodina munda – or unidentified comparable form
   †Araucarioxylon
  †Araucarioxylon arizonicum
  † Arca
  Arcopagia – or unidentified comparable form
  †Arcopagia A – informal
  Arctica
  †Arganodus
  †Aricycas
  †Aricycas paulae
  †Arizonasaurus – type locality for genus
  †Arizonasaurus babbitti – type locality for species
  Astarte
  †Astarte adkinsi
  †Australosomus – or unidentified comparable form
caption: Petrified trunk segments of the Permian-Late Triassic conifer tree Araucarioxylon arizonicum. This species is the state fossil of Arizona
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