Deinosuchus fossil map
Where fossils of Deinosuchus have been found, shown on the Earth as it looked about 75 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 75 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 | 83.6–72.2 million years ago (Campanian) |
| Periods | Cretaceous |
| Named by | Holland 1909 |
| Fossil records | 19 occurrences at 18 locations (PBDB) |
| Found in | United States, Mexico |
| Rock formations | Aguja, Judith River, Mooreville, Kaiparowits, Fruitland, Coffee Sand |
About Deinosuchus
Deinosuchus is an extinct genus of eusuchian, either an alligatoroid crocodilian or a stem-group crocodilian, which lived during the Late Cretaceous around 82 to 73 million years ago. The first remains were discovered in North Carolina in the 1850s, and the genus was first described in 1909. Additional fragments were discovered in the 1940s and were later incorporated into an influential, though inaccurate, skull reconstruction at the American Museum of Natural History. Knowledge of Deinosuchus remains incomplete, but better cranial and postcranial material found in recent years has expanded scientific understanding of this massive predator.
Although Deinosuchus was far larger than any modern crocodile or alligator, with the largest surpassing 9 meters (30 ft) in total length, its overall appearance was fairly similar to its smaller relatives, but with a proportionally longer skull than modern crocodilians. It had large, robust teeth built for crushing, and its back was covered with thick hemispherical osteoderms. One study indicated Deinosuchus may have lived for up to 50 years, growing at a rate similar to that of modern crocodilians, but maintaining this growth over a much longer time.
Text in “About” is quoted from the Wikipedia article Deinosuchus (revision 1378716335), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 22 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q133223.
