Redondasaurus is temporally restricted and easily identified. The biostratigraphic importance of the genus was reaffirmed when it was determined that the beginning of the Apachean was lower than previously concluded. Rather than at the base of the Redonda Formation, the Apachean appears high in the Bull Canyon Formation. Correlating the vertebrate stratigraphy of Redondasaurus has also allowed for the correlation of Redonda locally within the southwestern USA. Given the recent acquisition of additional diagnostic characteristics, and the increase in number of Redondasaurus skulls recognized in literature, it is likely that the use of the genus as an index fossil will expand to other deposits and even globally. References Further reading The Great Rift Valleys of Pangea in Eastern North America By Peter M. LeTourneau, Paul Eric Olsen. Published 2003, Columbia University Press. Palaeogeography, Palaeoclimatology, Palaeoecology By Elsevier Science (Firm). Published 1998, Elsevier. v. 143. Original from the University of California. External links Redondasaurus at the Paleobiology Database Phytosaurs Prehistoric reptile genera Late Triassic reptiles of North America Chinle fauna Fossil taxa described in 1993