The accumulation regarding several people of mainly one to taxon categorizes the latest area given that a beneficial monodominant bonebed (Eberth ainsi que al
The brand new Chinle Formation at PEFO has grown to become really-old of the large-accuracy U–Pb zircon years and magnetostratigraphy, indicating that entire formation in this region try Norian-Rhaetian for the age (Kent et al., 2018 , 2019 ; Ramezani mais aussi al., 2011 ; Rasmussen mais aussi al., 2020 ). Roentgen. callenderi occurs in the newest uppermost Bluish Mesa Affiliate courtesy middle Petrified Tree Affiliate at the PEFO, with a numerical age groups off
No specimens monitor one signs of scavenging conclusion
218.5–210 Ma (middle-late Norian; Rasmussen ainsi que al., 2020 ). There clearly was specific uncertainty regarding ages of the low area of one’s Sonsela User according to the ages design picked (Rasmussen et al., 2020 ) however, this doesn’t affect the age of the original or history incidents off R. callenderi at the PEFO.
2.2 Taphonomy
Hundreds of elements of Roentgen. callenderi was basically compiled out of PFV 297, ranging from broken separated skeleton to partly articulated skeletons. , 2007 ). The fresh new specimens were every recovered from horizon in the an excellent greenish-gray mudstone (“bluish web sites” out-of Loughney et al., 2011 ) that is adjacent to a channel facies of Painted Wasteland Sandstone step three (Parker et al., 2005 ), hence most likely depict levee dumps on the proximal portion of the floodplain (T. Demko, individual communication, ). Almost every other vertebrate localities throughout the Petrified Tree Affiliate can be found inside comparable drab-colored beds that have been interpreted as the representing defectively strained paleosols within the abandoned route fill that were at least seasonally drinking water-soaked (Loughney mais aussi al., 2011 ; Therrien & Fastovsky, 2000 ). Continue Reading
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