The fresh Chinle Development in the PEFO has become really-dated from the highest-precision U–Pb zircon age and you may magnetostratigraphy, exhibiting that whole development in this area is Norian-Rhaetian inside the age (Kent et al., 2018 , 2019 ; Ramezani ainsi que al., 2011 ; Rasmussen ainsi que al., 2020 ). Roentgen. callenderi happens in the fresh new uppermost Blue Mesa Member compliment of center Petrified Tree Member from the PEFO, which have a numerical age groups out of
No specimens display screen people signs of scavenging conclusion
218.5–210 Ma (middle-late Norian; Rasmussen mais aussi al., 2020 ). There’s particular uncertainty on the age of the low part of Sonsela Associate depending on the ages design chosen (Rasmussen mais aussi al., 2020 ) however, this won’t affect the ages of the first otherwise history situations off R. callenderi from the PEFO.
A huge selection of components of R. callenderi had been collected of PFV 297, anywhere between busted isolated bones so you can partially articulated skeletons. , 2007 ). The brand new specimens had been the recovered in one horizon in the a beneficial greenish-gray mudstone (“bluish internet sites” of Loughney mais aussi al., 2011 ) which is next to a channel facies of the Coated Wilderness Sandstone 3 (Parker et al., 2005 ), and therefore most likely show levee places on the proximal part of the floodplain (T. Demko, personal interaction, ). Almost every other vertebrate localities regarding the Petrified Forest Associate occur within similar drab-coloured bedrooms that have been interpreted because representing badly drained paleosols inside quit route fill that were no less than seasonally liquids-saturated (Loughney ainsi que al., 2011 ; Therrien & Fastovsky, 2000 ).