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Found 18 results

  1. There is a very interesting paper about the tracks of footprints of birds, pterosaurs, dinosaurs found just below the K/Pg boundary in the Las Encinas Formation, State of Coahuila, Mexico. Although the PDF is in Spanish, a more or less usable translation can be obtained using document option of Goggle Translate. The open access paper is: Serrano-Brañas, C., Espinosa-Chávez, B., Flores-Ventura, J., Barrera-Guevara, D., Torres-Rodríguez, E., Cadena-González, D., and Vega, F.J., 2024. Huellas de aves, pterosaurios, dinosaurios y el límite K/Pg en Coahuila, México (Footprints of birds, pterosaurs, dinosaurs and the K/Pg limit in Coahuila, Mexico). Revista-Maya-Geociencias, Febrero 2024. pp. 96-105. LInks to PDFs of Febrero 2024 and other issues of Revista Maya Geociencia A related paper is: Serrano-Brañas, C.I., Espinosa-Chávez, B., Ventura, J.F., Barrera-Guevara, D., Torres-Rodríguez, E. and Vega, F.J., 2022. New insights on the avian trace fossil record from NE Mexico: evidences on the diversity of latest Maastrichtian web-footed bird tracks. Journal of South American Earth Sciences, 113, p.103686. Yours, Paul H.
  2. “Chill Factor” – The Volcanic Plot Twist in Dinosaur Extinction SciTechDaily, December 4, 2023 The open access paper is: Callegaro, S., Baker, D.R., Renne, P.R., Melluso, L., Geraki, K., Whitehouse, M.J., De Min, A. and Marzoli, A., 2023. Recurring volcanic winters during the latest Cretaceous: Sulfur and fluorine budgets of Deccan Traps lavas. Science Advances, 9(40), p.eadg8284. Yours, Paul H.
  3. ThePhysicist

    K-Pg Boundary Microtektites

    From the album: Dinosaurs

    K-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 (each typically ~ 1 mm in diameter). The layer which these came from is more famous for its unusually high concentration of iridium (which is more common in meteorites than on Earth). However, in some locations, tektites have been preserved. In this matrix sample, I've also found carbonized plant material (charcoal), which suggests fires that could be associated with the impact event.
  4. '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, R.A., Smit, J., Burnham, D.A., Kuiper, K., Manning, P.L., Oleinik, A., Larson, P., Maurrasse, F.J., Vellekoop, J., Richards, M.A. and Gurche, L., 2019. A seismically induced onshore surge deposit at the KPg boundary, North Dakota. Proceedings of the National Academy of Sciences, 116(17), pp.8190-8199. Yours, Paul H.
  5. Tidgy's Dad

    Another K-Pg Impact Crater?

  6. Giant 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.
  7. How 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 Neotropical rainforests. Science. Vol. 372, Issue 6537, pp. 63-68 Related papers Wing, S.L., Herrera, F., Jaramillo, C.A., Gómez-Navarro, C., Wilf, P. and Labandeira, C.C., 2009. Late Paleocene fossils from the Cerrejón Formation, Colombia, are the earliest record of Neotropical rainforest. Proceedings of the National Academy of Sciences, 106(44), pp.18627-18632. Graham, H.V., Herrera, F., Jaramillo, C., Wing, S.L. and Freeman, K.H., 2019. Canopy structure in Late Cretaceous and Paleocene forests as reconstructed from carbon isotope analyses of fossil leaves. Geology, 47(10), pp.977-981. Yours, Paul H.
  8. Iridium 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 impact did a superfrack job on the Deccan volcanoes and magnified their eruptions. Go see; Richards, M.A., Alvarez, W., Self, S., Karlstrom, L., Renne, P.R., Manga, M., Sprain, C.J., Smit, J., Vanderkluysen, L. and Gibson, S.A., 2015. Triggering of the largest Deccan eruptions by the impact. Geological Society of America Bulletin, 127(11-12), pp.1507-1520. http://eprints.esc.cam.ac.uk/3289/1/Gibson bul gsa.pdf http://pages.uoregon.edu/leif/resources/papers/GSAB_2015_Richards.pdf https://pubs.geoscienceworld.org/gsa/gsabulletin/article-abstract/127/1112/1507/126064 Commentary on flood basalts and mass extinctions: Ernst, R.E. and Youbi, N., 2017. How Large Igneous Provinces affect global climate, sometimes cause mass extinctions, and represent natural markers in the geological record. Palaeogeography, palaeoclimatology, palaeoecology, 478, pp.30-52. Link, Ernst and Youbi (2017), at bottom of page at http://www.largeigneousprovinces.org/downloads http://www.largeigneousprovinces.org/sites/default/files2/Ernst and Youbi 2017 PPP.PDF https://www.sciencedirect.com/science/article/pii/S0031018217302857 Yours, Paul H.
  9. Astronomers: 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/s41598-021-82320-2 https://www.cfa.harvard.edu/~loeb/SLD.pdf Keep warm and safe out there Paul H.
  10. Yale 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: Hull, P.M., Bornemann, A., Penman, D.E., Henehan, M.J., Norris, R.D., Wilson, P.A., Blum, P., Alegret, L., Batenburg, S.J., Bown, P.R. and Bralower, T.J., 2020. On impact and volcanism across the Cretaceous- Paleogene boundary. Science, 367(6475), pp.266-272. https://science.sciencemag.org/content/367/6475/266.abstract Yours, Paul H.
  11. Colorado 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.
  12. 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.
  13. Oxytropidoceras

    Feud About the Extinction of Dinosaurs

    The 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.
  14. The 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 paper is; Joseph S. Byrnes and Leif Karlstrom, 2018, Anomalous K-Pg–aged seafloor attributed to impact-induced mid-ocean ridge magmatism Science Advances 07 Feb 2018: Vol. 4, no. 2, eaao2994 DOI: 10.1126/sciadv.aao2994 http://advances.sciencemag.org/content/4/2/eaao2994 Yours, Paul H.
  15. Asteroid 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). DOI: 10.1002/2017GL074879 http://onlinelibrary.wiley.com/doi/10.1002/2017GL074879/abstract A related paper is: Pierazzo, E. and Artemieva, N., 2012. Local and global environmental effects of impacts on Earth. Elements, 8(1), pp.55-60. http://users.unimi.it/paleomag/geo2/Pierazzo&Artemieva2012.pdf Yours, Paul H.
  16. Update: 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, 2016, The formation of peak rings in large impact craters. vol. 354, no. 6314, pp. 878-882 DOI: 10.1126/science.aah6561 http://science.sciencemag.org/content/354/6314/878 Yours, Paul H.
  17. Chicxulub '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 finally unlock its true age: New estimates suggest 180 craters of at least ten metres in diameter form each year by Liat Clark, Wired, A facelift for the Moon every 81,000 years, October 12, 2016 http://phys.org/news/2016-10-facelift-moon-years.html http://phys.org/news/2016-10-reveals-lunar-surface-features-younger.html The paper is: Speyerer, E. J., R. Z. Povilaitis, M. S. Robinson, P. C. Thomas, And R. V. Wagner, 2016, Quantifying crater production and regolith overturn on the Moon with temporal imaging. Nature. Vol. 538, pp. 215–218 (13 October 2016) doi:10.1038/nature19829 http://nature.com/articles/doi:10.1038/nature19829 Yours, Paul H.
  18. I 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-A3qbm4RkCeIFXHaPb2EVn3ap0G3b1pHFSVXy90zLMqgt4tXhTiLK7MOz-qxds3Zt0CPGeZQXuwdHS2-CR1auCDyPsi6UW4iYlbkxQbKMLkXjFaORoU0LWEG2PiXGDuYcfGk9V3XlBVU7L2IoecWvRMEL1Tw%3D%3D&attredirects=0 Thank you for your kindness.
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