''Tridentichnus'' is an

ichnogenus An ichnotaxon (plural ichnotaxa) is "a taxon based on the fossilized work of an organism", i.e. the non-human equivalent of an artifact. ''Ichnotaxon'' comes from the Ancient Greek (''íchnos'') meaning "track" and English , itself derived from ...

of fossil footprints. The ''Tridentichnus'' trackmaker was a relatively large animal with five toes on its hind feet. They are preserved in the

Supai Formation The Supai Group is a slope-former, slope-forming sequence of mixed red beds and limestones that outcrop in the Colorado Plateau. The group was laid down during the Pennsylvanian (geology), Pennsylvanian to Lower Permian. Cliff-former, Cliff-formin ...

and located in

Arizona Arizona is a U.S. state, state in the Southwestern United States, Southwestern region of the United States, sharing the Four Corners region of the western United States with Colorado, New Mexico, and Utah. It also borders Nevada to the nort ...

, United States. The ichnospecies '' Steganoposaurus belli'' are similar footprints preserved in the Tensleep Sandstone of

Wyoming Wyoming ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States, Western United States. It borders Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho t ...

Footnotes

References

* Lockley, Martin and Hunt, Adrian. '' Dinosaur Tracks of Western North America''. Columbia University Press. 1999. Vertebrate trace fossils {{trace-fossil-stub