Every month, 100,000 readers use the Dinosaur Database, but we receive no support from you. Developing and updating the database requires a lot of work. Therefore, as of September 1, 2025, the database will be closed. If you want it to remain open and be updated, please support us via the "Buy us a coffee" button available on every page.
Dinosaur: Arkansaurus fridayi

Length*: | 4.5 m | 14.8 ft |
Weight*: | 200 kg | 441 lb |
*The largest known specimen
Period
Epoch: Early Cretaceous
Stage: Aptian-Albian
Years: 121.4–100.5 Ma
Details
Status: valid
Author: Hunt & Quinn
Year: 2018
Distribution
Area: North America
Country: USA
Region: Arkansas
Formation: Trinity Group
Locations
Sources
Material: Partial right pes, including metatarsals II, III, and IV, pedal phalanges II-1, III-1, III-2, and IV-1, and three pedal unguals.
References: Hunt, R. K., & Quinn, J. H. (2018). A new ornithomimosaur from the Lower Cretaceous Trinity Group of Arkansas.