page_title: List of the Mesozoic life of Colorado
section_title: A
hierarchical_section_title: List of the Mesozoic life of Colorado / A
caption_attribution_description: English: Cropped image of taxon in file name
context_page_description: This list of the Mesozoic 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 252.17 and 66 million years of age.
context_section_description: †Acanthichnus – tentative report
  Acila
  †Acila chicotana
  Acmaea
  †Acmaea genettae – type locality for species
  †Adocus
  †Albanerpeton
  †Albanerpeton nexuosus
  †Albertosaurus – tentative report
  †Aletridelphys
  †Aletridelphys hatcheri
  †Allantodiopsis
  †Allantodiopsis erosa
  †Allantodiopsis JC018 – informal
   †Allosaurus – type locality for genus
  †Allosaurus fragilis – type locality for species
  †Allosaurus lucasi – type locality for species
  †Amblotherium – type locality for genus
  †Amblotherium gracilis
  Amia
  †Amphicoelias – type locality for genus
  †Amphicoelias altus – type locality for species
   †Amphicotylus
  †Amphicotylus lucasii – type locality for species
  †Amplovalvata
  †Amplovalvata scabrida
  †Anaklinoceras
  †Anaklinoceras minutum – type locality for species
  †Anaklinoceras reflexum
  †Anisoceras
  †Anisoceras plicatilis
  †Anisomyon
  †Anisomyon centrale
  †Anomia
  †Anomia subquadrata
  †Anomia tellinoides
   †Anomoepus – tentative report
  †Apateodus
  †Apatopus
  †Apatosaurus – type locality for genus
  †Apatosaurus ajax – type locality for species
  †Apatosaurus laticollis – type locality for species. Junior synonym of A. louisae.
  †Apatosaurus louisae
  †Arcellites
  †Arcellites disciformis
  †Archaeolamna
  †Archaeolamna kopingensis
  †Arenicolites
  Aspideretes
  †Aspideretes vagans – type locality for species
  †Aspideretoides
  Astarte
  †Atlantosaurus
  †Atlantosaurus immanis – type locality for species
  †Axonoceras
  †Axonoceras compressum
caption: Fossil (right) of the Early Jurassic dinosaur footprint ichnogenus Anomoepus
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