4 ms·
This is another fascinating window on the impact: https://news.berkeley.edu/2019/03/29/66-million-year-old-deathbed-linked-to-dinosaur-killing-meteor/ https://
by anadem 7y ago
This is another fascinating window on the impact:
https://news.berkeley.edu/2019/03/29/66-million-year-old-deathbed-linked-to-dinosaur-killing-meteor/ https://news.berkeley.edu/2019/03/29/66-million-year-old-dea...
"the first mass death assemblage of large organisms anyone has found associated with the K-T boundary"
And I've read (can't find the link now) that had the impact happened ten minutes sooner or ten minutes later the effect would have been much less, because the sulfur-bearing rocks wouldn't have been hit thus the climate-changing aerosols would not have been released.
- 5555624 7y agoAn article from The New Yorker on the same thing: https://www.newyorker.com/magazine/2019/04/08/the-day-the-dinosaurs-died https://www.newyorker.com/magazine/2019/04/08/the-day-the-di... The big concern at the time was that nothing about this find had been published in academic publications, just The New Yorker, Fox News, and other news outlets. I haven' heard anything since April.
- greeneggs 7y agoHere's the paper: "A seismically induced onshore surge deposit at the KPg boundary, North Dakota" Robert A. DePalma, Jan Smit, David A. Burnham, Klaudia Kuiper, Phillip L. Manning, Anton Oleinik, Peter Larson, Florentin J. Maurrasse, Johan Vellekoop, Mark A. Richards, Loren Gurche, and Walter Alvarez PNAS April 23, 2019 116 (17) 8190-8199 https://www.pnas.org/content/116/17/8190 https://www.pnas.org/content/116/17/8190
- mmmrtl 7y agoHere's the paper: The first day of the Cenozoic Sean P. S. Gulick, Timothy J. Bralower, Jens Ormö, Brendon Hall, Kliti Grice, Bettina Schaefer, Shelby Lyons, Katherine H. Freeman, Joanna V. Morgan, Natalia Artemieva, Pim Kaskes, Sietze J. de Graaff, Michael T. Whalen, Gareth S. Collins, Sonia M. Tikoo, Christina Verhagen, Gail L. Christeson, Philippe Claeys, Marco J. L. Coolen, Steven Goderis, Kazuhisa Goto, Richard A. F. Grieve, Naoma McCall, Gordon R. Osinski, Auriol S. P. Rae, Ulrich Riller, Jan Smit, Vivi Vajda, Axel Wittmann, the Expedition 364 Scientists Proceedings of the National Academy of Sciences Sep 2019, 201909479; DOI: 10.1073/pnas.1909479116 https://www.pnas.org/content/early/2019/09/04/1909479116 https://www.pnas.org/content/early/2019/09/04/1909479116
- ctchocula 7y agoI was curious about what you meant by 10 minutes sooner or 10 minutes later, so I found this [1]: > The discovery of the Chicxulub crater dramatically enhanced the community’s ability to evaluate the environmental effects of an impact at the K-T boundary, because both the geographic location of an impact site and the target rocks involved in an impact can affect the environmental outcome. For example, rocks composed of the mineral anhydrite in the Chicxulub target sequence imply that sulfate aerosols were injected into the stratosphere, affecting the radiative budget of the atmosphere (heating the stratosphere while cooling the Earth’s surface) before settling to the troposphere where they were washed out as acid rain. [1] https://www.lpi.usra.edu/science/kring/Chicxulub/global-effects/ https://www.lpi.usra.edu/science/kring/Chicxulub/global-effe...
- TeMPOraL 7y agoI assume the parent means that the same asteroid, on the same trajectory, but delayed or hastened by 10 minutes will hit a completely different spot on the planet.
- wiz21c 7y agoHAd to look for K-T boundary : Cretaceous–Tertiary (K-T) boundary :-)