Archosaurs are divided into two groups: Pseudosuchians (like crocodiles, alligators, and their extinct relatives) and Ornithodirans (birds and their extinct relatives).
Aetosaurs and Revueltosaurus ![]() NPS/Jeff Martz
![]() NPS
Poposaurids, shuvosaurids, and rauisuchids
![]() NPS/Jeff Martz
![]() NPS/Jeff Martz
Crocodylomorphs ![]() NPS/Jeff Martz Hesperosuchus is the most common crocodylomorph found among park fossils.
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Last updated: April 18, 2016