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Late Cretaceous sturgeons from K/Pg impact deposits in North Dakota
Oxytropidoceras posted a topic in Fossil News'Hell fish' likely killed by dinosaur-ending asteroid is preserved in stunning detail Joanna Thompson, Live Science, October 12, 2022 Four exceptional fossils represent newly described species. https://www.livescience.com/3d-sturgeon-fossils-tanis The open access paper is: Hilton, E.J. and Grande, L., 2022. Late Cretaceous sturgeons (Acipenseridae) from North America, with two new species from the Tanis site in the Hell Creek Formation of North Dakota. Journal of Paleontology, pp.1-29. Another open access paper is: DePalma,
Another K-Pg Impact Crater?
Tidgy's Dad posted a topic in Fossil Newshttps://www.bbc.com/news/science-environment-62575581
Chicxulub impact tsunami megaripples in the subsurface of Louisiana
Oxytropidoceras posted a topic in Fossil NewsGiant tsunami from dino-killing asteroid impact revealed in fossilized ‘megaripples’ By Akila Raghavan, AAAS Science, Jul. 12, 2021 The paper is: Kinsland, G.L., Egedahl, K., Strong, M.A. and Ivy, R., 2021. Chicxulub impact tsunami megaripples in the subsurface of Louisiana: Imaged in petroleum industry seismic data. Earth and Planetary Science Letters, 570, no.117063. Yours, Paul H.
K-Pg Impact Spurred the Evolution of the Modern Rainforest
Oxytropidoceras posted a topic in Fossil NewsHow the Dinosaur-Killing Asteroid Spurred the Evolution of the Modern Rainforest New evidence from fossil plants shows today’s South American rainforests arose in the wake of Earth’s fifth mass extinction. Smithsonian Magazine Prior to the Chicxulub impact, rainforests looked very different Plant fossils from Colombia show a turnover from conifers to today's forests. by Doug Johnson, Ars Technica, April 1, 2021 Paper Carvalho, M.R., Jaramillo, C., de la Parra, F. et al. 2021. Extinction at the end-Cretaceous and the origin of modern
Globally distributed iridium layer preserved within the Chicxulub impact structure
Oxytropidoceras posted a topic in Fossil NewsIridium in undersea crater confirms asteroid wiped out the dinosaurs Hamish Johnston, Physics World, February 24, 2021, https://physicsworld.com/a/iridium-in-undersea-crater-confirms-asteroid-wiped-out-the-dinosaurs/ Tha paper is: Goderis, S., Sato, H., Ferrière, L, et al. 2021, Globally distributed iridium layer preserved within the Chicxulub impact structure Science Advances 24 Feb 2021: Vol. 7, no. 9, eabe3647 https://advances.sciencemag.org/content/7/9/eabe3647 There are arguments that seismic waves from the Chicxulub imp
Breakup of a long-period comet as the origin of the dinosaur extinction
Oxytropidoceras posted a topic in Fossil NewsAstronomers: A comet fragment, not an asteroid, killed off the dinosaurs Jupiter's gravity pushed comet toward Sun; comet was ripped apart by tidal forces. Jennifer Ouellette, ArsTechnica, February 15, 2021 https://arstechnica.com/science/2021/02/astronomers-a-comet-fragment-not-an-asteroid-killed-off-the-dinosaurs/ The open access paper is: Siraj, A. and Loeb, A., Breakup of a Long-Period Comet as the Origin of the Dinosaur Extinction. Scientific Reports volume 11, Article number: 3803 (2021) https://www.nature.com/articles/s41598-021-8232
K-Pg Boundary Microtektites
ThePhysicist posted a gallery image in Members Gallery
From the album: DinosaursK-Pg Boundary Microtektites Hell Creek Formation Garfield Co., MT, USA These aren't fossils, but are relevant to the extinction of the non-avian dinosaurs, pterosaurs, large marine reptiles, and many other species of flora/fauna at the end of the Cretaceous. When a large meteor/asteroid struck the earth ~ 66 mya, it sent molten ejecta across the world. Some of this molten material, sourced from the impact site, was shaped by its trajectory through the atmosphere and cooled into small, glassy droplets. The black blobs you see are those droplets, called tektites
In death of dinosaurs, it was all about the asteroid
Oxytropidoceras posted a topic in Fossil NewsYale University. "In death of dinosaurs, it was all about the asteroid -- not volcanoes." ScienceDaily. ScienceDaily, 16 January 2020. https://www.sciencedaily.com/releases/2020/01/200116141708.htm Meteorite or Volcano? New Clues to the Dinosaurs’ Demise Twin calamities marked the end of the Cretaceous period, and scientists are presenting new evidence of which drove one of Earth’s great extinctions. New York Times, January 16, 2020 https://www.nytimes.com/2020/01/16/science/dinosaurs-extinction-meteorite-volcano.html The paper is:
Colorado Fossils Show How Mammals Raced to Fill Dinosaurs’ Void
Oxytropidoceras posted a topic in Fossil NewsColorado Fossils Show How Mammals Raced to Fill Dinosaurs’ Void An unusually rich trove found in Colorado reveals the world in which our mammalian forebears evolved into larger creatures. https://www.nytimes.com/2019/10/24/science/fossils-mammals-dinosaurs-colorado.html Fossil trove shows life's fast recovery after big extinction by Malcolm Ritter, PhysOrg. October 24, 2019 https://phys.org/news/2019-10-fossil-trove-life-fast-recovery.html Yours, Paul H.
Chicxulub impact acidified the ocean instantly
Oxytropidoceras posted a topic in Fossil NewsThe 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
Feud About the Extinction of Dinosaurs
Oxytropidoceras posted a topic in Fossil NewsThe Nastiest Feud in Science A Princeton geologist has endured decades of ridicule for arguing that the fifth extinction was caused not by an asteroid but by a series of colossal volcanic eruptions. But sheʼs reopened that debate. Bianca Bosker, The Atlantic, September 2018 https://www.theatlantic.com/magazine/archive/2018/09/dinosaur-extinction-debate/565769/ Gerta Keller, Professor of Geosciences http://gkeller.princeton.edu/ Yours, Paul H.
Seafloor Data Point to Global Volcanism after Chicxulub Impact
Oxytropidoceras posted a topic in Fossil NewsThe dinosaur-murdering asteroid maybe also triggered an underwater volcano meltdown. Why pick just one flavor of apocalypse? By Rachel Becker, The Verge, Feb 7, 2018 https://www.theverge.com/2018/2/7/16988112/asteroid-chicxulub-mass-extinction-dinosaurs-underwater-volcanoes-magma Seafloor data point to global volcanism after Chicxulub meteor strike, University of Oregon, February 7, 2018 https://www.eurekalert.org/pub_releases/2018-02/uoo-sdp020518.php https://around.uoregon.edu/content/one-two-punch-may-have-helped-deck-dinosaurs The pape
Chicxulub Impact Cooled Earth's Climate More than Previously Thought
Oxytropidoceras posted a topic in Fossil NewsAsteroid impact plunged dinosaurs into catastrophic 'winter' By Jonathan Amos, BBC, October 31, 2017 http://www.bbc.com/news/science-environment-41825471 Dinosaur-killing asteroid impact cooled Earth's climate more than previously thought. PhysOrg, October 31, 2017 https://phys.org/news/2017-10-dinosaur-killing-asteroid-impact-cooled-earth.html The paper is: Artemieva, N., et al, 2017, Quantifying the Release of Climate-Active Gases by Large Meteorite Impacts With a Case Study of Chicxulub. Geophysical Research Letters (2017). D
Drill Cores Clarify How Peak Rings In Chicxulub Crater Formed
Oxytropidoceras posted a topic in Fossil NewsUpdate: Drilling of dinosaur-killing impact crater explains buried circular hills by Eric Hand, Science News, Nov. 17, 2016 http://www.sciencemag.org/news/2016/11/update-drilling-dinosaur-killing-impact-crater-explains-buried-circular-hills Wendel, J., 2016, Cores from crater tied to dinosaur demise validate impact theory, Eos, 97, doi:10.1029/2016EO063123. Published on 17 November 2016. https://eos.org/articles/cores-crater-tied-dinosaur-demise-validate-impact-theory the paper is: Morgan, J. V., S. P. S. Gulick, and many others, 201
Chicxulub Impact Crater Investigation Begins in Earnest
Oxytropidoceras posted a topic in Fossil NewsChicxulub 'dinosaur crater' investigation begins in earnest by Jonathan Amos, BBC News, October 11, 2016 http://www.bbc.com/news/science-environment-37625348 In addition, Moon impacts are more frequent and hazardous then have been previously estimated. Go see; The moon has hundreds more craters than we thought Daily News, October 12, 2016 https://www.newscientist.com/article/2108929-the-moon-has-hundreds-more-craters-than-we-thought/ How old is our Moon? Hundreds of previously unseen craters could final
Which Layer Is K-Pg Boundary?
Fujii posted a topic in Questions & AnswersI am studying geology. I could not identify K-Pg boundary within this picture. http://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_boundary#mediaviewer/File:KT_boundary_054.jpg In addition, I have visited Horseshoe canyon, but is it possible to find T-Pg boundary in this picture? https://29b39c5a-a-62cb3a1a-s-sites.googlegroups.com/site/fkazumichi/home/english-fujii-kazumichi/Horseshoe%20formation.jpg?attachauth=ANoY7co1OJjZTF5XzOgS3an-tzNpf0UaK7ewt3I9fXKkNzQ277O3zaurGJru6nMwOsuqOzUMe7m3Ztslf795NdZRKcCcVJ7jiUV18K9MQtOar3ucC19o1lCPiGIJL22LKL-wRm-A3qbm4RkCeIFXHaPb2EVn3ap0G3b1pHFSVXy90