dos GEOLOGICAL Means
Neither Parker et al. ( 2005 ) neither Look mais aussi al. ( 2005 ) experimented with an excellent phylogenetic study regarding R. callenderi according to the the brand new skeletal point. Although not, one another groups listed several top features of the latest hindlimb which were unambiguous synapomorphies off Pseudosuchia. Parker et al. ( 2005 ) hypothesized a prospective cousin-classification reference to aetosaurs, listing the brand new morphological similarities of your squamosal and you can paramedian osteoderms. An identical reputation try proposed by Look mais aussi al. ( 2005 ) according to unspecified reputation states of your tarsus and also the osteoderms. Brusatte mais aussi al. ( 2010 ) incorporated Roentgen. callenderi inside their investigation out-of very early archosaur dating, programming regarding composed data and you will definitions of Parker ainsi que al. ( 2005 ) and you may Look et al. ( 2005 ). You to definitely research retrieved Roentgen. callenderi because the aunt taxon with the early-diverging suchian clade Ornithosuchidae. ( 2011 ) retrieved R. callenderi in a highly-supported reputation just like the sis taxon so you can aetosaurs, a consequence supported by newer training (elizabeth.grams., Butler et al., 2014 ; ; Nesbitt & Butler, 2013 ; Nesbitt ainsi que al., 2014 ; Nesbitt et al., 2020 ; Nesbitt, Stocker, ainsi que al., 2018 ).
Which share completely relates to the latest https://datingranking.net/tr/christianmingle-inceleme/ osteology out of R. callenderi centered on no less than twelve anybody (considering femora number) of PEFO plus three well-managed related limited skeletons collected between 2005 and 2015, will bring osteohistological perspective, and covers brand new taxon’s importance to have insights early suchian advancement.
dos.1 Stratigraphic standing
So it malfunction out of R. callenderi try mostly centered on situation off several localities regarding Chinle Development off Petrified Forest National Playground (PEFO), Arizona, All of us (Figure step 1; look for Medical Paleontology). The top Triassic Chinle Creation in this area constitutes mostly fluvial and floodplain strata off switching claystones, siltstones, sandstones, and you may conglomerates (Billingsley, 1985 ; Heckert & Lucas, 2002a ; ). The newest Chinle Development about Petrified Tree National Park urban area saves well-recognized traditional assemblages from flowers (palynomorphs, renders, wood), invertebrates, and you can vertebrates (elizabeth.g., Ash, 2005 ; Baranyi ainsi que al., 2018 ; An excellent, 1998 ; Irmis, 2005 ; Litwin, Traverse, & Ash, 1991 ; Parker, 2005b , 2006 ; Reichgelt mais aussi al., 2013 ). Really non-dentigerous and you may low-osteoderm specimens from Roentgen. callenderi away from PEFO, and those people demonstrated right here, have been found instantly above Painted Wilderness Sandstone 3 (sensu Billingsley, 1985 ; Lithodendron Wash Bed sensu Heckert & Lucas, 2002a ) in the middle an element of the Petrified Forest Associate (sensu Woody, 2006 ) of your own top area of the Chinle Development (Heckert & Lucas, 2002a ; Irmis, 2005 ; Padian, 1990 ; Parker, 2005b , 2006 ; Parker mais aussi al., 2005 ; Parker & ). Separated pearly whites out of Roentgen. callenderi was retrieved away from microvertebrate assemblages regarding reduced in brand new Chinle Formation on PEFO, extending new stratigraphic list of so it taxon toward Sonsela Member and you may uppermost Bluish Mesa Representative (pick Medical Paleontology).
The three head localities one lead the new specimens out-of R. callenderi revealed here (Data S1) could be the Revueltosaurus Quarry (PFV 297), Revueltosaurus Quarry SW (PFV 414), together with Offering Site (PFV 231). The web sites exists since the paleosols during the a stacked fluvial series for the the middle of new Petrified Forest Representative (Atchley ainsi que al., 2013 ; Loughney ainsi que al., 2011 ; Parker mais aussi al., 2005 ; Parker & ). PFV 297 and PFV 414 try split spatially by the 20 m consequently they are consequently on 200 m toward southeast off PFV 231 (Profile 1a). Coated Wilderness Sandstone step 3, and that quickly underlies the around three localities, are stratigraphically
40–fifty m over the root of the Petrified Forest User (Contour 1b; Parker & ), and you may is short for a sheet sandstone placed of the recurrent disperse inside the an excellent higher sinuosity lake station (Johns, 1988 ). PFV 297 and you can PFV 414 are present some large on the succession than just PFV 231 (Parker & ).