YPM 8545, but the correct designation is YPM 7666 following Heckert et al. (2012). The type series of R. olseni was thought to originate from the Pekin Formation of Montgomery County. Heckert et al. (2012) noted that recent field work has shown that strata formerly assigned to that formation, including the type locality of R. olseni, actually pertain to the overlying Cumnock Formation (located in the Sanford Subbasin, Deep River Basin). Hence, the type locality and the newly discovered Moncure locality are from the same stratigraphic interval. The Cumnock Formation belongs to the Chathan Group (of the Newark Supergroup), which is recognized as Late Triassic in age. Most workers have assigned the Cumnock Formation a Carnian age. Most recent work, however, demonstrates that much of it is in fact Norian in age. Therefore, the strata exposed at the Moncure locality are probably early Norian in age. The Moncure locality have yielded many referred specimens of R. olseni including NCSM 21647, NCSM 23539, 41-46, 48-50, 52-57, NCSM 24722, 58-62 and NCSM 25194-227. NCSM 24728, 25192-3 and 25228 were referred to ?Revueltosaurus. Some osteoderms were referred to it to, as they very similar to those seen in the Petrified Forest material of R. callenderi. R. olseni is thought to be one of the most common tetrapods from its assemblage. Irmis et al. (2007) and Nesbitt et al. (2007) tentatively synonymized Pekinosaurus (and Galtonia) with Revueltosaurus, and refer its type series to Revueltosaurus sp. They noted that Hunt and Lucas (1994) did not provide any differential diagnosis, autapomorphies, or unique combination of characters for Pekinosaurus. Furthermore, they argued that it cannot be differentiated from R. callenderi. Heckert et al. (2012) agreed that R. olseni is extremely similar to R. callenderi, however they found that Pekinosaurus teeth have slightly different proportions and outline than R. callenderi. They provided a differential diagnosis for that species and referred it to Revueltosaurus, under the new combination R. olseni. Classification All species of Revueltosaurus were thought to represent monospecific genera of basal ornithischian dinosaurs based on their teeth. New discoveries of skeletal material of R. callenderi have suggested that Revueltosaurus is a pseudosuchian. According to William Parker, "we have pretty much erased the record of Triassic ornithischian dinosaurs from North America, Europe and worldwide, except for South America." His co-author Randall Irmis said, "because the teeth look like those we know from herbivorous ornithischians, people assigned them to