[2] Fossil theropod tracks have been reported from the formation.

[3] The formation consists of interbedded fine-grained red-brown sandstone and mudstone.

[2] The formation is interpreted as having been deposited in a lake with an area of about 5,000 square kilometres (1,900 sq mi).

Hemicalypterus Semionotus Synornichthys Apachesaurus A metoposaurid, possibly juveniles of Koskinonodon Redondagnathus A trirachodontid cynodont Apachesuchus An aetosaur similar to Neoaetosauroides Redondasaurus A phytosaur Redondasuchus A typothoracisine aetosaur related to Typothorax Redondavenator A large, predatory basal crocodylomorph Vancleavea The unit was first named as the Redonda Member of the Chinle Formation by Dobrovolny and Summerson in 1947.

[1] Griggs and Read raised the unit to formation rank in 1959, and also assigned an age of late Triassic based on the presence of tracks of a bipedal dinosaur and of a phytosaur skull.