Abundant pre-dinosaurian tetrapod tracks, ichnofossil Chirotherium, have been found in the Moenkopi Formation. Swimming reptile tracks are found in the Torrey Member of the Moenkopi Formation in Capitol Reef National Park near Torrey, Utah. The tracks are preserved in a fine-grained sandstone deposited on a flat-lying coastal plain.
Davis, Larry E. and Eves, Robert L.
"Swimming Reptile Tracks in the Lower Triassic Moenkopi Formation, Capitol Reef National Park, UT,"
The Compass: Earth Science Journal of Sigma Gamma Epsilon:
1, Article 2.
Available at: http://digitalcommons.csbsju.edu/compass/vol88/iss1/2