New discovery of Jurassic dinosaur fossils in Chaya area, Qamdu district, Tibet.
The dinosaur fossils were discovered in Jurassic red beds in Chaya area, Qamdu district,Tibet, mainly including ribs, vertebral bodies and so on, and their well preserved cervical vertebrae and scapula and pubis were morphologically described. Despite some difficulties in the attribution of species since few materials have been discovered so far, the discovery enriches the Jurassic dinosaur-bearing localities. Many dinosaur bones have been discovered in this area, indicating that they are relatively abundant. Further exploration and study of dinosaur fossils in the region will help us better understand the early evolution and differentiation of sauropods and theropods in Asia.
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Steven Goderis, Honami Sato, Ludovic FerriÃre, Birger Schmitz, David Burney, Pim Kaskes, Johan Vellekoop, Axel Wittmann, Toni Schulz, Stepan M. Chernonozhkin, Philippe Claeys, Sietze J. de Graaff, Thomas DÃhais, Niels J. de Winter, Mikael Elfman, Jean-Guillaume Feignon, Akira Ishikawa, Christian Koeberl, Per Kristiansson, Clive R. Neal, Jeremy D. Owens, Martin Schmieder, Matthias Sinnesael, Frank Vanhaecke, Stijn J. M. Van Malderen, Timothy J. Bralower, Sean P. S. Gulick,, David A. Kring, Christopher M. Lowery, Joanna V. Morgan, Jan Smit, Michael T. Whalen & IODP-ICDP Expedition Scientists (2021)
Globally distributed iridium layer preserved within the Chicxulub impact structure.
Science Advances 7(9): eabe3647
DOI: 10.1126/sciadv.abe3647
https://advances.sciencemag.org/content/7/9/eabe3647
The Cretaceous-Paleogene (K-Pg) mass extinction is marked globally by elevated concentrations of iridium, emplaced by a hypervelocity impact event 66 million years ago. Here, we report new data from four independent laboratories that reveal a positive iridium anomaly within the peak-ring sequence of the Chicxulub impact structure, in drill core recovered by IODP-ICDP Expedition 364. The highest concentration of ultrafine meteoritic matter occurs in the post-impact sediments that cover the crater peak ring, just below the lowermost Danian pelagic limestone. Within years to decades after the impact event, this part of the Chicxulub impact basin returned to a relatively low-energy depositional environment, recording in unprecedented detail the recovery of life during the succeeding millennia. The iridium layer provides a key temporal horizon precisely linking Chicxulub to K-Pg boundary sections worldwide.