Arizonasaurus fossil map
Where fossils of Arizonasaurus have been found, shown on the Earth as it looked about 252 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 252 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Crocodile relatives |
|---|---|
| Lived | 247–244.4 million years ago |
| Periods | Triassic |
| Family | Ctenosauriscidae |
| Named by | Welles 1947 |
| Fossil records | 6 occurrences at 6 locations (PBDB) |
| Found in | United States |
| Rock formations | Moenkopi |
About Arizonasaurus
Arizonasaurus (meaning "Arizona reptile") is a genus of ctenosauriscid archosaur from the Middle Triassic (243 million years ago) Moenkopi Formation of what is now Arizona. It is known for having a large back sail formed by elongated neural spines of its vertebrae. The type and only known species is A. babbitti, named and described in 1947.
Text in “About” is quoted from the Wikipedia article Arizonasaurus (revision 1372243404), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q134797.
