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Found 27 results

  1. Texas cave sediment upends meteorite explanation for global cooling by Baylor University August 1, 2020 https://phys.org/news/2020-07-texas-cave-sediment-upends-meteorite.html The paper is: Sun, N, Brandon, A.D., Forman, S.L., Waters, M.R. and Befus, K.S., 2020. Volcanic origin for Younger Dryas geochemical anomalies ca. 12,900 cal B.P. Science Advances, 6(31), eaax8587 https://advances.sciencemag.org/content/6/31/eaax8587 Related papers: Holliday, V.T., Bartlein, P.J., Scott, A.C. and Marlon, J.R., 2020. Extraordinary biomass-burning episode and impact winter triggered by the Younger Dryas cosmic impact∼ 12,800 years ago, parts 1 and 2: a discussion. The Journal of Geology, 128(1), pp.69-94. https://www.journals.uchicago.edu/doi/abs/10.1086/706264 Wolbach, W.S., Ballard, J.P., Mayewski, P.A., Kurbatov, A., Bunch, T.E., LeCompte, M.A., Adedeji, V., Israde-Alcántara, I., Firestone, R.B., Mahaney, W.C. and Melott, A.L., 2020. Extraordinary Biomass-Burning Episode and Impact Winter Triggered by the Younger Dryas Cosmic Impact∼ 12,800 Years Ago: A Reply. The Journal of Geology, 128(1), pp.95-107. https://www.journals.uchicago.edu/doi/abs/10.1086/706265 Yours, Paul H.
  2. Asteroid shower rained space rocks on Earth and the moon 800 million years ago By Charles Q. Choi, SpaceCom, July 21, 2020 Asteroid shower on the Earth-Moon system 800 million years ago revealed by lunar craters by Osaka University, PhysOrg, July 21, 2020 The open access paper is: Terada, K., Morota, T. & Kato, M. Asteroid shower on the Earth-Moon system immediately before the Cryogenian period revealed by KAGUYA. Nature Communications (2020). DOI: 10.1038/s41467-020-17115-6 Yours, Paul H.
  3. New insight into the Great Dying, University of Leeds, June 11, 2020 https://phys.org/news/2020-06-insight-great-dying.html The open access paper is: Jacopo Dal Corso, Benjamin J. W. Mills, Daoliang Chu, Robert J. Newton, Tamsin A. Mather, Wenchao Shu, Yuyang Wu, Jinnan Tong, and Paul B. Wignall (2020) Permo-Triassic boundary carbon and mercury cycling linked to terrestrial ecosystem collapse. Nature Communications 11, Article number: 2962 doi: https://doi.org/10.1038/s41467-020-16725-4 https://www.nature.com/articles/s41467-020-16725-4 https://www.nature.com/articles/s41467-020-16725-4.pdf Yours, Paul H.
  4. Coal-burning in Siberia led to climate change 250 million years ago, Arizona State University https://asunow.asu.edu/20200615-coal-burning-siberia-led-climate-change-250-million-years-ago Elkins-Tanton, L.T., Grasby, S.E., Black, B.A., Veselovskiy, R.V., Ardakani, O.H. and Goodarzi, F., 2020. Field evidence for coal combustion links the 252 Ma Siberian Traps with global carbon disruption. Geology, 48. (open access) https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47365.1/587319/Field-evidence-for-coal-combustion-links-the-252 Yours, Paul H.
  5. There is a series of open access papers about what caused the Late Ordovician mass extinction. They are: Bond, D.P. and Grasby, S.E., 2020. Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation. Geology. https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47377.1/586486/Late-Ordovician-mass-extinction-caused-by Mitchell, C. E., and Melchin, M.J., 2020. COMMENT: Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation. Geology https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47946C.1/587311/COMMENT-Late-Ordovician-mass-extinction-caused-by Bond, D.P. and Grasby, S.E., 2020. REPLY: Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation. Geology. https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47984Y.1/587312/REPLY-Late-Ordovician-mass-extinction-caused-by Wang, G., Zhan, R. and Percival, I.G., 2019. The end-Ordovician mass extinction: A single-pulse event?. Earth-Science Reviews, 192, pp.15-33. https://www.sciencedirect.com/science/article/pii/S0012825218305099 https://www.researchgate.net/publication/331275476_The_end-Ordovician_mass_extinction_A_single-pulse_event https://www.researchgate.net/profile/Gx_Wang2 Yours, Paul H.
  6. End-Devonian Mass Extinction Caused by Erosion of Ozone Layer, New Study Finds, Sci-News. May 28, 2020 http://www.sci-news.com/paleontology/end-devonian-mass-extinction-erosion-ozone-layer-08477.html No asteroids needed: ancient mass extinction tied to ozone loss, warming climate By Paul Voosen Science News, May. 27, 2020 https://www.sciencemag.org/news/2020/05/no-asteroids-or-volcanoes-needed-ancient-mass-extinction-tied-ozone-loss-warming The open access paper is: John E. A. Marshall, Jon Lakin, Troth, and Sarah M. Wallace-Johnson, 2020, UV-B radiation was the Devonian-Carboniferous boundary terrestrial extinction kill mechanism. Science Advances 27 May 2020: Vol. 6, no. 22, eaba0768 DOI: 10.1126/sciadv.aba0768 https://advances.sciencemag.org/content/6/22/eaba0768 https://advances.sciencemag.org/content/6/22/eaba0768/tab-pdf Yours, Paul H.
  7. Green, C. E., 2019. Investigating the origin of a Greenland ice core geochemical anomaly near the Bølling-Allerød/Younger Dryas boundary (Doctoral dissertation, Durham University). http://etheses.dur.ac.uk/13490/ http://etheses.dur.ac.uk/13490/1/C_Green_thesis_final_CORRECTIONS.pdf Green (2019) noted: "The source of a platinum peak identified in the Greenland Ice Sheet Project 2 (GISP2) ice core associated with high platinum/iridium (Pt/Ir) and platinum/aluminium (Pt/Al) ratios, and previous research attributed the anomaly to an unusual iron-rich Ir-poor meteorite impact." Green (2019) concluded: I. the Laacher See eruption is not the Pt spike source because: A. the Laacher See tephra has low Pt concentrations, B. the Laacher See tephra’s geochemical ratios are dissimilar to the GISP2 Pt spike and C. conversion of the Pt spike timing to the newest ice core age-depth model shows a chronological offset of ~60 years between the two events. II. The event resulting in the Pt spike occurred ~60 years after GS-1 cooling, and was therefore not the primary trigger. III. and the Pt spike origin is interpreted as either: A. a noncataclysmic impact of an undiscovered iron meteorite B. or an unidentified Pt-rich volcanic eruption contemporaneous with the anomaly, whose aerosol fractionated in the atmosphere or ice. Yours, Paul H.
  8. Racki, G., 2020, Volcanism as a prime cause of mass extinctions: Retrospectives and perspectives, in Adatte, T., Bond, D.P.G., and Keller, G., eds., Mass Extinctions, Volcanism, and Impacts: New Developments: Geological Society of America Special Paper 544, p. 1–34 https://www.researchgate.net/publication/337951571_Volcanism_as_a_prime_cause_of_mass_extinctions_Retrospectives_and_perspectives https://www.researchgate.net/profile/Grzegorz_Racki Racki, G., Rakociński, M., Marynowski, L. and Wignall, P.B., 2018. Mercury enrichments and the Frasnian-Famennian biotic crisis: A volcanic trigger proved?. Geology, 46(6), pp.543-546. https://www.researchgate.net/publication/326031821_Mercury_enrichments_and_the_Frasnian-Famennian_biotic_crisis_A_volcanic_trigger_proved Let's be careful out there, Paul H.
  9. A new study shows that stony corals, which provide food and shelter for almost a quarter of all ocean species, are preparing for a major extinction event. Researchers identified an increased prevalence of certain traits found with previous extinction-survival characteristics among corals. By studying the fossil record of coral skeletons, they were able to determine that corals are showing some survival traits that match the last major extinction event 66mya. These traits include an increase in deep water residence, cosmopolitan distributions, smaller colonies, non-symbiotic relationship to algae and higher resistance to bleaching. The study also discusses in detail the comparison to primates and discusses how primates don't show the same survival characteristics that some corals do. Finally the authors state that the corals that are likely to survive extinction are less likely to be from tropical coral reefs and more likely to be from smaller, solitary, slower growing & deep dwelling corals. https://www.sciencedaily.com/releases/2020/03/200303113246.htm Gal Dishon, Michal Grossowicz, Michael Krom, Gilad Guy, David F. Gruber, Dan Tchernov. Evolutionary Traits that Enable Scleractinian Corals to Survive Mass Extinction Events. Scientific Reports, 2020; 10 (1) - the article is open access https://www.nature.com/articles/s41598-020-60605-2#rightslink
  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. 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.
  12. New evidence suggests volcanoes caused biggest mass extinction ever Mercury found in ancient rock around the world supports theory that eruptions caused 'Great Dying' 252 million years ago. University of Cincinnati, Science Daily, April 15, 2019 https://www.sciencedaily.com/releases/2019/04/190415122249.htm The open access paper is: Jun Shen, Jiubin Chen, Thomas J. Algeo, Shengliu Yuan, Qinglai Feng, Jianxin Yu, Lian Zhou, Brennan O’Connell, Noah J. Planavsky. Evidence for a prolonged Permian–Triassic extinction interval from global marine mercury records. Nature Communications, 2019; 10 (1) https://www.nature.com/articles/s41467-019-09620-0 Yours, Paul H.
  13. Meet the Antarctic king

    https://www.eurekalert.org/pub_releases/2019-01/fm-idc012319.php http://blogs.discovermagazine.com/deadthings/2019/01/31/antarctanax/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A DiscoverBlogs (Discover Blogs)
  14. Stone, P. and McCarthy, D., 2018. Were the Falkland Islands hit by a giant asteroid 250 million years ago?. Falkland Islands Journal, 11(2), pp.42-54. http://nora.nerc.ac.uk/id/eprint/521520/ http://nora.nerc.ac.uk/id/eprint/521520/1/STONE AND MCCARTHY FIJ 2018pp 42-54.pdf Yours, Paul H.
  15. Megalodon may have been killed off by Supernova radiation, Hannah Osborne, Newsweek, December 13, 2018 https://www.newsweek.com/megalodon-extinct-shark-supernova-cosmic-ray-cancer-mutations-1256980 Massive supernova explosion may have wiped out giant prehistoric sharks, scientists say. Megalodon may have been among creatures driven to extinction after cosmic particles drove up cancer rates, new study claims The Independent, Josh Gabbatiss, December 2018 https://www.independent.co.uk/news/science/supernova-stars-explosion-giant-sharks-prehistoric-megalodon-extinction-science-a8679636.html The paper is: Adrian L. Melott, Franciole Marinho, and Laura Paulucci 2018, Hypothesis: Muon Radiation Dose and Marine Megafaunal Extinction at the End-Pliocene Supernova. Astrobiology, Published Online, November 27, 2018 https://doi.org/10.1089/ast.2018.1902 and at Muon Radiation Dose and Marine Megafaunal Extinction at the end-Pliocene Supernova Adrian L. Melott (Kansas), Franciole Marinho, Laura Paulucci (Submitted on 26 Dec 2017 (v1), last revised 17 Oct 2018 (this version, v2)) https://arxiv.org/pdf/1712.09367.pdf https://arxiv.org/abs/1712.09367 Yours, Paul H.
  16. Kornei, K. (2018), Tiny algae may have prompted a mass extinction, Eos, 99, https://doi.org/10.1029/2018EO102539. Published on 11 July 2018. https://eos.org/articles/tiny-algae-may-have-prompted-a-mass-extinction https://eos.org/wp-content/uploads/2018/08/eos0918.pdf?x69145 https://eos.org/current-issues The paper is; Shen, J., Pearson, A., Henkes, G.A., Zhang, Y.G., Chen, K., Li, D., Wankel, S.D., Finney, S.C. and Shen, Y., 2018. Improved efficiency of the biological pump as a trigger for the Late Ordovician glaciation. Nature Geoscience, 11(7), p.510. https://www.nature.com/articles/s41561-018-0141-5 Yours, Paul H.
  17. Near-Earth Supernovas snd Mass Extinctions

    Near-Earth Supernova Explosions (When Stars Attack! ) In Search of Near-Earth Supernova Explosions Brian Fields, KU Physics & Astronomy Public Talks, Published on Apr 20, 2016 https://www.youtube.com/watch?v=ND6u4Rnq0g0 Related papers are: Breitschwerdt, D., Feige, J., Schulreich, M.M., de Avillez, M.A., Dettbarn, C. and Fuchs, B., 2016. The locations of recent supernovae near the Sun from modelling 60 Fe transport. Nature, 532(7597), p. 73-78. https://www.earth.northwestern.edu/people/seth/351/breitschwerdt.pdf https://www.nature.com/articles/nature17424 Fields, B.D. and Ellis, J., 1999. On deep-ocean 60Fe as a fossil of a near-earth supernova. New Astronomy, 4(6), pp. 419-430. https://arxiv.org/pdf/astro-ph/9811457.pdf https://www.sciencedirect.com/science/article/pii/S1384107699000342 Fry, B.J., Fields, B.D. and Ellis, J.R., 2015. Astrophysical shrapnel: Discriminating among near-earth stellar explosion sources of live radioactive isotopes. The Astrophysical Journal, 800(1), 17 pp. https://arxiv.org/pdf/1405.4310.pdf http://iopscience.iop.org/article/10.1088/0004-637X/800/1/71/meta Wallner, A., Feige, J., Kinoshita, N., Paul, M., Fifield, L.K., Golser, R., Honda, M., Linnemann, U., Matsuzaki, H., Merchel, S. and Rugel, G., 2016. Recent near- Earth supernovae probed by global deposition of interstellar radioactive 60 Fe. Nature, 532(7597), pp. 69-72. Yours, Paul H.
  18. 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.
  19. http://www.geologypage.com/2018/06/what-caused-the-mass-extinction-of-earths-first-animals.html
  20. Mercury Rising: New evidence that volcanism triggered the late Devonian extinction, Geological Society of America, May 1, 2018 https://www.sciencedaily.com/releases/2018/05/180501161805.htm Volcanic Eruptions Led to Mass Extinction 370 Million Years Ago http://www.sci-news.com/geology/volcanic-eruptions-late-devonian-mass-extinction-05967.html The abstract is: Grzegorz Racki, Michał Rakociński, Leszek Marynowski, Paul B. Wignall. Mercury enrichments and the Frasnian- Famennian biotic crisis: A volcanic trigger proved? Geology, 2018; DOI: 10.1130/G40233.1 https://pubs.geoscienceworld.org/gsa/geology/article-abstract/530692/mercury-enrichments-and-the-frasnian-famennian Related papers are: Courtillot, V., Kravchinsky, V.A., Quidelleur, X., Renne, P.R. and Gladkochub, D.P., 2010. Preliminary dating of the Viluy traps (Eastern Siberia): Eruption at the time of Late Devonian extinction events?. Earth and Planetary Science Letters, 300(3-4), pp. 239-245. https://sites.ualberta.ca/~vadim/Publications-Kravchinsky.htm https://sites.ualberta.ca/~vadim/Publications-Kravchinsky_files/2010-Courtillot et al - Preliminary dating of the Viluy traps.pdf Kravchinsky, V.A., 2012. Paleozoic large igneous provinces of Northern Eurasia: correlation with mass extinction events. Global and Planetary Change, 86, pp. 31-36. https://sites.ualberta.ca/~vadim/Publications-Kravchinsky.htm https://sites.ualberta.ca/~vadim/Publications-Kravchinsky_files/2012-Kravchinsky - Paleozoic large igneous provinces of Northern Eurasia- Correlation with mass extinction events.pdf Ricci, J., Quidelleur, X., Pavlov, V., Orlov, S., Shatsillo, A. and Courtillot, V., 2013. New 40Ar/39Ar and K–Ar ages of the Viluy traps (Eastern Siberia): further evidence for a relationship with the Frasnian–Famennian mass extinction. Palaeogeography, Palaeoclimatology, Palaeoecology, 386, pp. 531-540. http://paleomag-ifz.ru/en/articles?page=1 http://www.paleomag-ifz.ru/sites/default/files/articles/ricci_et_al.pdf Carmichael, S.K., Waters, J.A., Batchelor, C.J., Coleman, D.M., Suttner, T.J., Kido, E., Moore, L.M. and Chadimová, L., 2016. Climate instability and tipping points in the Late Devonian: detection of the Hangenberg Event in an open oceanic island arc in the Central Asian Orogenic Belt. Gondwana Research, 32, pp. 213-231. https://pdfs.semanticscholar.org/270e/8f86bcc9677b802e049640d2dc8f8ab01652.pdf Yours, Paul H.
  21. Dinosaurs ended - and originated - with a bang ? In the new paper, published today in Nature Communications, evidence is provided to match the two events – the mass extinction, called the Carnian Pluvial Episode, and the initial diversification of dinosaurs Press release http://www.bristol.ac.uk/news/2018/april/dinosaurs-ended-and-originated-with-a-bang-.html Paper https://www.nature.com/articles/s41467-018-03996-1
  22. Did Ice Age Cause Mastodon Extinction?

    Did Ice Age Cause Mastodon Extinction? New Research Suggest Several Causes Central Washington University, Oct. 29, 2017 http://www.cwu.edu/did-ice-age-cause-mastodon-extinction-new-research-suggest-several-causes Emery-Wetherell, Meaghan M., Brianna K. McHorse, and Edward Byrd Davis. "Spatially explicit analysis sheds new light on the Pleistocene megafaunal extinction in North America." Paleobiology (2017): 1-14. https://www.researchgate.net/publication/319333874_Spatially_explicit_analysis_sheds_new_light_on_the_Pleistocene_megafaunal_extinction_in_North_America https://www.cambridge.org/core/journals/paleobiology/article/spatially-explicit-analysis-sheds-new-light-on-the-pleistocene-megafaunal-extinction-in-north-america/ https://www.cambridge.org/core/journals/paleobiology/article/spatially-explicit-analysis-sheds-new-light-on-the-pleistocene-megafaunal-extinction-in-north-america/A3EBE9B5067CFFB821F4EDC81962421D Another paper is: Brault, M.O., Mysak, L.A., Matthews, H.D. and Simmons, C.T., 2013. Assessing the impact of late Pleistocene megafaunal extinctions on global vegetation and climate. Climate of the Past, 9(4), p.1761. https://www.clim-past.net/9/1761/2013/cp-9-1761-2013.pdf https://search.proquest.com/docview/1430895281?pq-origsite=gscholar http://citeseerx.ist.psu.edu/viewdoc/download?doi= Yours, Paul H.
  23. 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.
  24. Interesting open access paper on mass extinctions. Jones, D. S., A. M. Martini, D. A. Fike, and K. Kaiho, 2017, A volcanic trigger for the Late Ordovician mass extinction? Mercury data from south China and Laurentia. Geology v. 45; no. 7; p. 631–634 http://geology.geoscienceworld.org.libezp.lib.lsu.edu/content/45/7/631 http://geology.geoscienceworld.org.libezp.lib.lsu.edu/content/45/7 Yours, Paul H.
  25. Falkland Islands basin shows signs of being among world's largest craters, New York University, May 4, 2017 https://www.sciencedaily.com/releases/2017/05/170504131658.htm Falkland Islands basin shows signs of being among world's largest craters, Engineering, Science and Technology Research New York University, May 4, 2017 http://www.nyu.edu/about/news-publications/news/2017/may/falkland-islands-basin-shows-signs-of-being-among-worlds-largest.html The paper is: Rocca, M.C., Rampino, M.R. and Báez Presser, J.L., 2017. Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau. Terra Nova. http://onlinelibrary.wiley.com/doi/10.1111/ter.12269/abstract Another paper is: Rocca, M. C. L., & Baez Presser, J. L., 2015. A possible new very large impact structure in Islas Malvinas. Historia Natural, Tercera Serie, 5, 121–133. https://www.researchgate.net/publication/283123311_A_POSSIBLE_NEW_VERY_LARGE_IMPACT_STRUCTURE_IN_MALVINAS_ISLANDS yours, Paul H.