Oxytropidoceras Posted June 3, 2021 Share Posted June 3, 2021 (edited) Mysterious event nearly wiped out sharks 19 million years ago By Yasemin Saplakoglu, Live Science, June 3, 2021 "It's unknown whether the ancient sharks died off in a single day, weeks, years or even thousands of years." The paper is: Elizabeth C. Sibert and Leah D. Rubin, 2021 An early Miocene extinction in pelagic sharks Science 04 Jun 2021: Vol. 372, Issue 6546, pp. 1105-1107 DOI: 10.1126/science.aaz3549 Yours, Paul H. Edited June 3, 2021 by Oxytropidoceras changed title 1 Link to post Share on other sites
Harry Pristis Posted June 3, 2021 Share Posted June 3, 2021 I think this is sketchy research hyped by crappy science writing. 1 Link to post Share on other sites
JohnJ Posted June 3, 2021 Share Posted June 3, 2021 Quote Romain Vullo, a paleontologist with the French National Center for Scientific Research (CNRS) at the Géosciences Rennes, in France, who was not part of the study, said the findings were surprising. They can't be explained by a known global climate event at the time, and the extinction isn't seen in the global fossil record of sharks, he told Live Science in an email. Still, "further data from other regions in the world would be required to confirm the interpretation of the authors," he added. Sibert and Rubin draw a major conclusion based on detailed study at two sites. It seems overly presumptive, given the scope of their claims. Link to post Share on other sites
FossilDAWG Posted June 4, 2021 Share Posted June 4, 2021 I'm surprised this survived peer review. Don 1 Link to post Share on other sites
siteseer Posted June 10, 2021 Share Posted June 10, 2021 Nineteen million years ago, world climates were warming and sea level was rising as a general trend. Sharks might have adjusted to the changes and weren't frequenting the same areas. I don't have the paper so I wonder which shark taxa are said to have died out. A few of the apparently pelagic sharks of the time were Alopias (various species including the large A. grandis and A. palatasi), Parotodus, and Isurus retroflexus. They have been proposed as pelagic forms because they are rare in nearshore deposits with modern Alopias species frequenting the open ocean or observed nearshore and open ocean. Those sharks don't seem to have become any rarer in the early Miocene than before or after. Jess Link to post Share on other sites
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