6.2.step 3 Most other Revueltosaurus-such taxa
To start with labeled an enthusiastic ornithischian dinosaur (Galton, 1983 ), Irmis, Parker, ainsi que al. ( 2007 ) contended you to definitely NSM 004 Sweetheart , a beneficial posterior part of a left maxilla with the majority of good enamel from inside the a keen alveolus, offers enough character says with Roentgen. callenderi in both dental care and you can maxillary morphology including a strong ridge along side ventral margin of your antorbital fossa, the latest well-put up buccal emargination of your own enamel row when you look at the ventral examine, and you will a good denticled enamel top devoid of good basal asymmetrical swelling (Irmis, Parker, ainsi que al., 2007 ). An ilium about Wolfville Development (NSM 012 Girl ) is very similar to that of R. callenderi in that have a keen anterior procedure for the newest iliac blade one will not extend anteriorly outside of the prior the amount of your own pubic peduncle and it has a broad, circular dorsal margin towards the iliac knife. That it element together with supporting the clear presence of a beneficial Revueltosaurus-like taxon on formation (Sues & Olsen, 2015 ).
six.3 Biostratigraphic situations and implications
Roentgen. callenderi only has become registered out-of a couple of section, the sort locality from the Bull Canyon Development (Dockum Group) out-of east The brand new Mexico (Check, 1989 ; Search et al., 2005 ) plus the Chinle Development in the Petrified Forest Federal Playground (Padian, 1990 ; Beuhler mais aussi al., 2001 ; Parker et al., 2005 ; Atchley ainsi que al., 2013 ; Profile 1b). From the second area, just before looking voucher specimens of the taxon from the uppermost Bluish Mesa Associate and you will middle Sonsela Member, https://datingranking.net/tr/chatrandom-inceleme/ R. callenderi is actually considered take place in a limited stratigraphic diversity for the the low-middle Petrified Forest Associate (Beuhler et al., 2001 ; Look, 2001 ; Parker & ) debated you to Roentgen. callenderi is actually off biochronological electricity. In this new North american country sorts of locality and Painted Desert localities from inside the north PEFO, R. callenderi cooccurs into aetosaur T. coccinarum and mystriosuchine (= pseudopalatine) leptosuchomorph phytosaurs, taxa that have been used due to the fact directory taxa toward Revueltian holochronozone (Lucas & See, 1993 ; ) argued that once the at PEFO R. callenderi are discover only for the a particular facies (blue paleosols) on an individual stratigraphic top (right above the Painted Wasteland 3 Sandstone), why these events don’t show the genuine stratigraphic range of the taxon and you can instead reflected a preservation bias. Subsequent discoveries out of R. callenderi question about Owl Material Member (Gordon et al., 2020 ; Whatley ainsi que al., 2013 ) and Sonsela User (Atchley ainsi que al., 2013 ) supporting so it theory, that the new specimens reveal that at least at PEFO, the stratigraphic set of Roentgen. callenderi offers to your hidden Adamanian holochronozone. Its lack of Roentgen. callenderi in the other penecontemporaneous internet about American Southwestern is puzzling, eg given how numerous it’s during the web sites in which they does occur. Such, the latest vertebrate assemblage of your Petrified Tree Representative in the Ghost Farm from inside the northern The fresh new Mexico was geographically intermediate amongst the form of locality regarding R. callenderi and PEFO, shares the visibility a variety of Revueltian index taxa (Irmis, Nesbitt, mais aussi al., 2007 ; Whiteside ainsi que al., 2015 ), and contains perfect ages limits that show it overlaps eventually to the all the way down Petrified Tree Associate at the PEFO (Irmis ainsi que al., 2011 ; Rasmussen ainsi que al., 2020 ). There isn’t any visible taphonomic reason why it really-sampled and varied assemblage must not preserve Revueltosaurus, since it contains many techniques from brief-bodied drepanosaurs so you can highest-bodied phytosaurs and you can aetosaurs. Similarly, it is interested you to R. callenderi was not found at most other Bull Canyon Formation websites or in equivalent strata in the western Colorado (e.g., Lehman & Chatterjee, 2005 ; ).