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Bipedal archosaur tracks frome Late Triassic of China



From: Ben Creisler
bcreisler@gmail.com


A new online paper:

Lida Xing, Guangzhao Peng, Daniel Marty, Yong Ye, Hendrik Klein,
Jianjun Li, Gerard D. Gierliński, and Chunkang Shu (2013)
An unusual trackway of a possibly bipedal archosaur from the Late
Triassic of the Sichuan Basin, China.
Acta Palaeontologica Polonica (in press)
doi: http://dx.doi.org/10.4202/app.2012.0087
http://app.pan.pl/article/item/app20120087.html


The Longguan dinosaur tracksite in the Sichuan Basin (China) is
described. It is located in the uppermost part of the Upper Triassic
Xujiahe Formation and displays a single, unusual trackway consisting
of 19 deeply impressed pes imprints. All tracks have suffered from
erosion over many years of exposure, but they still reveal interesting
details such as conspicuous elongated grooves, interpreted here as toe
and claw drag marks. The trackmaker, a medium-sized archosaur, was
walking in a thick and relatively soft layer of sand. The elongated,
oval shape of the footprints resembles the ichnogenus Eosauropus from
North America and Europe, assigned to facultative bipedal
sauropodomorphs. The Chinese track differs by inward rotation of the
footprints toward the midline, whereas in Eosauropus, these are turned
strictly outward. Other ichnotaxa and possible trackmakers are
discussed, but presently, a distinct assignment cannot be given. The
Longguan trackway enlarges the scarce footprint record from the
Triassic of China.