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Showing results for tags 'cretaceous–paleogene boundary'.
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My family and I have recently made a few trips to Mussell Creek (Alabama), which contains the Prairie Bluff Chalk. This the is very end of the Cretaceous in Alabama. I have been told that in some places this formation shows evidence of the Chicxulub tsunami, though I do not know if this is visible at this site. In one of the pictures I am pointing a stick at the Prarie Bluff Chalk. Right above that is the Paleogene. We have found small shark teeth, urchins, coral, baculites and snails at the site, along with large amounts of shells, including some nice Exogyra (I think) oysters. Unfortunately, I don't have images of the fossils yet (they aren't super exciting, except that some of the Exogyra are really well preserved), but as you can see it is a truly beautiful site, and wading in the cool creek makes for some fun fossil hunting. My kids are all better fossil hunters than me....my youngest is insisting I get him a screen with 1/8 mesh so he won't miss any of the really tiny teeth! (how does he see them?)
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The Dinosaur-Killing Asteroid Acidified the Ocean in a Flash The Chicxulub event was as damaging to life in the oceans as it was to creatures on land, a study shows. New York Times https://www.nytimes.com/2019/10/21/science/chicxulub-asteroid-ocean-acid.html Tiny shell fossils reveal how ocean acidification can cause mass extinction By Julie Zaugg, CNN, October 22, 2019 https://www.cnn.com/2019/10/22/europe/ocean-acidification-asteroid-intl-hnk-scn/index.html New study underpins the idea of a sudden impact killing off dinosaurs and much of the other life, GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre October 22, 2019 https://www.sciencedaily.com/releases/2019/10/191022080721.htm The open access paper is: Michael J. Henehan, Andy Ridgwell, Ellen Thomas, Shuang Zhang, Laia Alegret, Daniela N. Schmidt, James W. B. Rae, James D. Witts, Neil H. Landman, Sarah E. Greene, Brian T. Huber, James R. Super, Noah J. Planavsky, Pincelli M. Hull, 2019, Rapid ocean acidification and protracted Earth system recovery followed the end-Cretaceous Chicxulub impact. Proceedings of the National Academy of Sciences Oct 2019, 201905989; DOI: 10.1073/pnas.1905989116 https://www.pnas.org/content/early/2019/10/15/1905989116 Yours, Paul H.
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