2 GEOLOGICAL Means
Neither Parker mais aussi al. ( 2005 ) neither Have a look ainsi que al. ( 2005 ) experimented with an excellent phylogenetic investigation from Roentgen. callenderi based on the the skeletal question. Although not, each other communities indexed several attributes of this new hindlimb that have been unambiguous synapomorphies out-of Pseudosuchia. Parker et al. ( 2005 ) hypothesized a potential cousin-category connection with aetosaurs, detailing the fresh morphological parallels of your squamosal and you will paramedian osteoderms. A similar condition are recommended of the Search et al. ( 2005 ) based on unspecified character says of one’s tarsus and osteoderms. Brusatte ainsi que al. ( 2010 ) integrated R. callenderi within studies out-of very early archosaur relationship, coding from the wrote rates and you can meanings of Parker ainsi que al. ( 2005 ) and you may See ainsi que al. ( 2005 ). You to definitely study retrieved Roentgen. callenderi because the sibling taxon into very early-diverging suchian clade Ornithosuchidae. ( 2011 ) retrieved R. callenderi for the a well-supported reputation given that sibling taxon in order to aetosaurs, an outcome backed by new training (e.grams., Butler et al., 2014 ; ; Nesbitt & Butler, 2013 ; Nesbitt ainsi que al., 2014 ; Nesbitt et al., 2020 ; Nesbitt, Stocker, mais aussi al., 2018 ).
That it sum totally describes the fresh new osteology off R. callenderi predicated on a minimum of twelve someone (according to femora number) out of PEFO as well as around three really-managed related partial skeletons amassed anywhere between 2005 and you can 2015, brings osteohistological context, and you will covers the latest taxon’s benefits to own skills very early suchian advancement.
dos.step one Stratigraphic reputation
So it malfunction out of Roentgen. callenderi are mainly predicated on point regarding multiple localities throughout the Chinle Creation away from Petrified Tree Federal Playground (PEFO), Arizona, You (Figure 1; discover Medical Paleontology). The top Triassic Chinle Formation of this type comprises mostly fluvial and you will floodplain strata out-of alternating claystones, siltstones, sandstones, and you will conglomerates (Billingsley, 1985 ; Heckert & Lucas, 2002a ; ). The newest Chinle Development regarding the Petrified Tree Federal Park area conserves well-known fossil assemblages away from herbs (palynomorphs, simply leaves, wood), invertebrates, and you may vertebrates (e.g., Ash, 2005 ; Baranyi ainsi que al., 2018 ; An excellent, 1998 ; Irmis, 2005 ; Litwin, Navigate, & Ash, 1991 ; Parker, 2005b , 2006 ; Reichgelt et al., 2013 ). Most non-dentigerous and you may non-osteoderm specimens from R. callenderi out of PEFO, including those people demonstrated here, have been discovered instantaneously significantly more than Decorated Desert Sandstone 3 (sensu Billingsley, 1985 ; Lithodendron Clean Sleep sensu Heckert & Lucas, 2002a ) among part of the Petrified Tree Representative (sensu Woody, 2006 ) of the higher the main Chinle Creation (Heckert & Lucas, 2002a ; Irmis, 2005 ; Padian dine app, 1990 ; Parker, 2005b , 2006 ; Parker mais aussi al., 2005 ; Parker & ). Remote white teeth regarding Roentgen. callenderi had been recovered away from microvertebrate assemblages regarding reduced in the new Chinle Creation at the PEFO, stretching the stratigraphic range of that it taxon towards the Sonsela Representative and you can highest Blue Mesa User (come across Logical Paleontology).
The 3 main localities you to lead brand new specimens from Roentgen. callenderi demonstrated here (Studies S1) will be the Revueltosaurus Quarry (PFV 297), Revueltosaurus Quarry SW (PFV 414), additionally the Giving Website (PFV 231). The internet sites exists since paleosols into the a piled fluvial series within the the center of the newest Petrified Tree Representative (Atchley et al., 2013 ; Loughney mais aussi al., 2011 ; Parker mais aussi al., 2005 ; Parker & ). PFV 297 and you can PFV 414 was split up spatially of the 20 meters and generally are consequently regarding 200 m toward southeast of PFV 231 (Shape 1a). Decorated Wasteland Sandstone 3, hence quickly underlies the around three localities, is stratigraphically
40–50 meters above the foot of the Petrified Forest Member (Shape 1b; Parker & ), and is short for a layer sandstone placed by the recurrent disperse during the a great large sinuosity river channel (Johns, 1988 ). PFV 297 and you will PFV 414 can be found quite high on succession than just PFV 231 (Parker & ).
