6.dos.3 Almost every other Revueltosaurus-such as for instance taxa
Originally labeled a keen ornithischian dinosaur (Galton, 1983 ), Irmis, Parker, et al. ( 2007 ) argued one to NSM 004 Girlfriend , a beneficial posterior part of a left maxilla that have the majority of a great tooth when you look at the an alveolus, offers a great amount of character says which have R. callenderi in both dental care and you can maxillary morphology including an effective ridge over the ventral margin of your antorbital fossa, brand new well-put up buccal emargination of your enamel row inside ventral check, and you may good denticled enamel top not having a great basal asymmetrical swelling (Irmis, Parker, et al., 2007 ). An enthusiastic ilium about Wolfville Creation (NSM 012 Gf ) is very like Roentgen. callenderi inside which have dabble a keen prior process of the fresh iliac knife that doesn’t stretch anteriorly outside of the anterior the amount of one’s pubic peduncle features a broad, round dorsal margin towards iliac blade. That it feature and additionally supporting the presence of a great Revueltosaurus-such taxon throughout the creation (Sues & Olsen, 2015 ).
six.3 Biostratigraphic events and ramifications
R. callenderi has only started registered off a few section, the sort area on the Bull Canyon Development (Dockum Category) regarding eastern New Mexico (Seem, 1989 ; Hunt mais aussi al., 2005 ) as well as the Chinle Formation during the Petrified Forest National Park (Padian, 1990 ; Beuhler ainsi que al., 2001 ; Parker mais aussi al., 2005 ; Atchley ainsi que al., 2013 ; Figure 1b). In the latter area, ahead of looking coupon specimens of your taxon on highest Bluish Mesa Representative and you can center Sonsela Associate, R. callenderi are considered occur in a small stratigraphic range in the the lower-middle Petrified Tree Representative (Beuhler ainsi que al., 2001 ; Take a look, 2001 ; Parker & ) argued that Roentgen. callenderi try from biochronological energy. In the latest North american country style of area and Coated Wasteland localities in the northern PEFO, R. callenderi cooccurs to the aetosaur T. coccinarum and you can mystriosuchine (= pseudopalatine) leptosuchomorph phytosaurs, taxa which have been used due to the fact directory taxa to the Revueltian holochronozone (Lucas & Have a look, 1993 ; ) argued you to definitely since on PEFO Roentgen. callenderi is actually found merely within the a specific facies (bluish paleosols) at one stratigraphic peak (just over the Painted Wilderness step three Sandstone), these incidents didn’t depict the genuine stratigraphic list of the new taxon and alternatively shown a maintenance bias. After that discoveries of Roentgen. callenderi topic on the Owl Stone Affiliate (Gordon et al., 2020 ; Whatley et al., 2013 ) and Sonsela Affiliate (Atchley mais aussi al., 2013 ) helps it theory, and these this new specimens show that at least during the PEFO, the new stratigraphic variety of Roentgen. callenderi offers into the fundamental Adamanian holochronozone. The absence of Roentgen. callenderi at almost every other penecontemporaneous web sites regarding American Southwestern try puzzling, such offered how plentiful it is at the web sites in which it takes place. Such as, the fresh new vertebrate assemblage of your own Petrified Tree User at Ghost Ranch for the northern This new Mexico are geographically advanced within variety of area regarding Roentgen. callenderi and you will PEFO, shares the newest visibility a variety of Revueltian index taxa (Irmis, Nesbitt, mais aussi al., 2007 ; Whiteside mais aussi al., 2015 ), and it has specific ages limitations that show it overlaps as time passes with the lower Petrified Tree User within PEFO (Irmis mais aussi al., 2011 ; Rasmussen ainsi que al., 2020 ). There isn’t any obvious taphonomic reason why it really-tested and you may varied assemblage ought not to manage Revueltosaurus, as it contains everything from quick-bodied drepanosaurs so you can higher-bodied phytosaurs and aetosaurs. Likewise, it’s interested one R. callenderi was not found at almost every other Bull Canyon Formation sites or in similar strata inside western Colorado (e.grams., Lehman & Chatterjee, 2005 ; ).