six.2.3 Most other Revueltosaurus-including taxa
Originally known a keen ornithischian dinosaur (Galton, 1983 ), Irmis, Parker, ainsi que al. ( 2007 ) contended you to NSM 004 Gf , a great posterior percentage of a left maxilla that have much of an excellent tooth in an enthusiastic alveolus, shares a lot of reputation claims having R. callenderi in both dental care and you can maxillary morphology as well as a strong ridge over the ventral margin of your own antorbital fossa, the newest well-arranged buccal emargination of your own tooth row when you look at the ventral have a look at, and you can a beneficial denticled tooth top devoid of good basal asymmetrical swelling (Irmis, Parker, et al., 2007 ). An ilium in the Wolfville Creation (NSM 012 Girl ) is very similar to that of Roentgen. callenderi within the with an enthusiastic prior process of new iliac blade you to doesn't increase anteriorly beyond the prior the amount of one's pubic peduncle and contains a standard, game dorsal margin into iliac blade. It function and additionally helps the current presence of an effective Revueltosaurus-for example taxon about development (Sues & Olsen, 2015 ).
six.step three Biostratigraphic occurrences and you will implications
Roentgen. callenderi has only been recorded off one or two components, the sort area about Bull Canyon Formation (Dockum Category) out-of eastern New Mexico (Seem, 1989 ; Search ainsi que al., 2005 ) while the Chinle Creation within Petrified Tree Federal Playground (Padian, 1990 ; Beuhler ainsi que al., 2001 ; Parker et al., 2005 ; Atchley ainsi que al., 2013 ; Contour 1b). Within latter location, just before trying to find voucher specimens of the taxon regarding highest Blue Mesa Associate and center Sonsela Representative, R. callenderi was believed to take place in a finite stratigraphic range inside the the reduced-center Petrified Tree Affiliate (Beuhler mais aussi al., 2001 ; Hunt, 2001 ; Parker & ) argued one to R. callenderi is of biochronological utility. In the newest North american country method of area and Painted Desert localities within the northern PEFO, R. callenderi cooccurs into aetosaur T. coccinarum and you may mystriosuchine (= pseudopalatine) leptosuchomorph phytosaurs, taxa that have been utilized as the list taxa towards Revueltian holochronozone (Lucas & Look, 1993 ; ) argued you to as on PEFO R. callenderi try discovered only inside the a certain facies (blue paleosols) at the just one stratigraphic level (just over the Coated Desert step three Sandstone), these particular occurrences failed to depict the real stratigraphic list of the latest taxon and you will rather reflected an upkeep prejudice. Next discoveries off R. callenderi issue throughout the Owl Stone Associate (Gordon mais aussi al., 2020 ; Whatley mais aussi al., 2013 ) and you can Sonsela Member (Atchley et al., 2013 ) aids that it hypothesis, that brand new specimens demonstrate that at the very least at the PEFO, the latest stratigraphic directory of R. callenderi stretches towards root Adamanian holochronozone. The absence of R. callenderi at the almost every other penecontemporaneous internet sites throughout the Western Southwestern was puzzling, including offered just how abundant it is on websites in which it happen. Particularly, the latest vertebrate assemblage of Petrified Tree User within Ghost Ranch inside the north The latest Mexico are geographically advanced amongst the particular locality of Roentgen. callenderi and you will PEFO, shares this new presence some Revueltian directory taxa (Irmis, Nesbitt, et al., 2007 ; Whiteside ainsi que al., 2015 ) coffee meets bagel eЕџleЕџme, and also specific ages restrictions that show it overlaps in time on all the way down Petrified Forest Member within PEFO (Irmis et al., 2011 ; Rasmussen et al., 2020 ). There is no obvious taphonomic reason it better-sampled and you may varied assemblage cannot manage Revueltosaurus, as it include anything from short-bodied drepanosaurs in order to high-bodied phytosaurs and you may aetosaurs. Furthermore, it is interested you to R. callenderi wasn't found at almost every other Bull Canyon Formation internet sites or even in equivalent strata from inside the western Colorado (age.g., Lehman & Chatterjee, 2005 ; ).