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[dinosaur] Choristoderan(?) trackway from Cretaceous of Korea + dinoturbation in Xinjiang, China (free pdfs)



Ben Creisler
bcreisler@gmail.com

Recent ichnology papers with free pdfs:
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Novapes ulsanensis, n. ichnogen., n. ichnosp.Â

Yuong-Nam Lee, Dal-Yong Kong & Seung-Ho Jung (2020)
The first possible choristoderan trackway from the Lower Cretaceous Daegu Formation of South Korea and its implications on choristoderan locomotion.
Scientific Reports 10, Article number: 14442
doi: https://doi.org/10.1038/s41598-020-71384-1
https://www.nature.com/articles/s41598-020-71384-1

Free pdf:
https://www.nature.com/articles/s41598-020-71384-1.pdf


Here we report a new quadrupedal trackway found in the Lower Cretaceous Daegu Formation (Albian) in the vicinity of Ulsan Metropolitan City, South Korea, in 2018. A total of nine manus-pes imprints show a strong heteropodous quadrupedal trackway (length ratio is 1:3.36). Both manus and pes tracks are pentadactyl with claw marks. The manus prints rotate distinctly outward while the pes prints are nearly parallel to the direction of travel. The functional axis in manus and pes imprints suggests that the trackmaker moved along the medial side during the stroke progressions (entaxonic), indicating weight support on the inner side of the limbs. There is an indication of webbing between the pedal digits. These new tracks are assigned to Novapes ulsanensis, n. ichnogen., n. ichnosp., which are well-matched not only with foot skeletons and body size of Monjurosuchus but also the fossil record of choristoderes in East Asia, thereby N. ulsanensis could be made by a monjurosuchid-like choristoderan and represent the first possible choristoderan trackway from Asia. N. ulsanensis also suggests that semi-aquatic choristoderans were capable of walking semi-erect when moving on the ground with a similar locomotion pattern to that of crocodilians on land.

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Not yet mentioned


Lida Xing, Martin G. Lockley, Zhongdong Li, Hendrik Klein, Shaojie Chen, W. Scott Persons IV & Miaoyan Wang (2020)
Large scale dinoturbation in braided stream deposits: evidence from the Cretaceous Tugulu Group of the Hami area, Eastern Xinjiang, China.
Biosis: Biological Systems 1(2): 72-84.
doi: Âhttps://doi.org/10.37819/biosis.001.02.0054
https://eaapublishing.org/journals/index.php/biosis/article/view/54

Free pdf:

https://eaapublishing.org/journals/index.php/biosis/article/view/54/131


Large dinosaur tracks were recently reported from locations in the Pterosaur-Yadan National Geological Park situated about 100 km south of Hami in Xinjiang Province, China. The park comprises a substantial area in a much larger arid region comprising and extensive spectrum of Cretaceous, siliciclastic, Tugulu Group, lithofacies representing proximal, basin margin, alluvial fan and braided stream deposits, grading into alluvial plain, deltaic and lacustrine facies near the depocenter. Due to the difficulties of conducting detailed geological surveys in such a vast and inhospitable area, definitive resolution of the litho-, bio- and chrono-stratigraphy is challenging in some areas, and yet to be published in detail. Nevertheless, the occurrence of large dinosaur tracks and dinoturbated units, here interpreted as sauropodan, in association with root casts, dinosaur bone and fossil wood, points to the potential of this frontier area to yield valuable paleontological information, and show that flora and fauna were found in arid braided stream systems away from the lacustrine depocenters where body fossils are more abundant and better known.

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