The fresh new Chinle Development at PEFO became really-dated because of the high-accuracy U–Pb zircon many years and magnetostratigraphy, exhibiting the whole development here is Norian-Rhaetian when you look at the decades (Kent mais aussi al., 2018 , 2019 ; Ramezani ainsi que al., 2011 ; Rasmussen et al., 2020 ). R. callenderi takes place in the brand new best Blue Mesa User as a result of center Petrified Tree Member within PEFO, having a numerical a long time of

Zero specimens monitor any signs and symptoms of scavenging conclusion

218.5–210 Ma (middle-late Norian; Rasmussen ainsi que al., 2020 ). There is certainly some suspicion about chronilogical age of the low area of Sonsela Representative according to ages model selected (Rasmussen ainsi que al., 2020 ) but this does not affect the age of the first or past situations from Roentgen.