Arkansas State Dinosaur: Arkansaurus fridayi

In 1972, James Friday found fossil bones near Nashville in Howard County, Arkansas — primarily foot elements, fragmentary but unusual enough to warrant attention. The specimen went to the Arkansas State University Museum of Science and Natural History in Jonesboro, where it sat as a research curiosity for nearly four decades while paleontologists worked out what, exactly, they had.

The species name fridayi is a direct honor to the man who found it. James Friday's name is now embedded permanently in the zoological nomenclature — the formal taxonomic record that doesn't change — as the discoverer of the only dinosaur ever formally named from Arkansas.

The 2019 formal description by Scott Hartman, ReBecca Hunt-Foster, James Kirkland, and Marc and Colette Lowen placed Arkansaurus within or close to Ornithomimosauria — lightly built bipedal theropods, fast-moving, likely omnivorous or herbivorous. The genus Gallimimus is the most familiar member of the group.

The classification is provisional. What survives of Arkansaurus is foot bones — not skull, not teeth, not vertebrae — and foot anatomy alone carries limited phylogenetic weight for theropods. The 2019 authors were direct about this: the material is consistent with ornithomimosaur affinities, but the available evidence cannot rule out other placements. More complete material would be needed to settle the question, and none has been found.

Arkansas Act 840 of 2017 used the name 'Arkansaurus fridayi' in the legislation — but that name had not yet appeared in a peer-reviewed publication. The informal name was known within the paleontological community and had been used in museum contexts, but the formal description that establishes a name in zoological nomenclature didn't come until 2019. When it did, the published name matched what the law had already used, so there was no conflict. The state's official symbol simply had a legal existence for two years before it had a scientific one.

Most state dinosaurs are designated after formal description. Arkansas reversed the order. It's a minor procedural anomaly, but it's Arkansas-specific: no other state dinosaur has this gap between legislative recognition and scientific publication in its record.

The Trinity Group deposits of Howard County are roughly 110 million years old — Early Cretaceous, Albian stage. Arkansas's geological history makes terrestrial preservation at this age unusually difficult: large parts of the state were covered by shallow seas at different points during the Cretaceous, and the continental deposits that do exist have seen limited systematic paleontological survey. The Trinity Group near Nashville is one of the few windows into what lived on land in this part of the continent at that time.

Arkansaurus is not just the only named dinosaur from Arkansas — it may be the best land-animal evidence we have from this region for the entire Albian. That's a significant gap in the continental record, and it's part of why the 2019 description called Arkansaurus 'potentially important' despite the fragmentary material. What little there is may represent something genuinely rare in the North American fossil record.