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Found 16 results

  1. Oxytropidoceras
    Scientists Discover Ancient Traces of The Oldest Glaciers Ever Found by Clare Watson, Nature 12 July 2023 Science Alert article PhysOrg article The open access paper is: Hofmann, A. and Bindeman, I.N., 2023. Earth's first glaciation at 2.9 Ga revealed by triple oxygen isotopes. Geochemical Perspectives Letters, 26, pp.20-24. Yours, Paul H.
  2. Oxytropidoceras
    'Snowball Earth' might have been slushball by University of Cincinnati, April 9, 2023 The open access paper is: Song, H., An, Z., Ye, Q., Stüeken, E.E., Li, J., Hu, J., Algeo, T.J., Tian, L., Chu, D., Song, H. and Xiao, S., 2023. Mid-latitudinal habitable environment for marine eukaryotes during the waning stage of the Marinoan snowball glaciation. Nature Communications, 14(1), p.1564. Researchgate PDF Yoru, Paul H.
  3. Oxytropidoceras

    When Plate Tectonics Started

    Oxytropidoceras posted a topic in Geology

    Scientists Pin Down When Earth’s Crust Cracked, Then Came to Life New data indicating that Earth’s surface broke up about 3.2 billion years ago helps clarify how plate tectonics drove the evolution of complex life. The paper is: Tusch, J., Münker, C., Hasenstab, E., Jansen, M., Marien, C.S., Kurzweil, F., Van Kranendonk, M.J., Smithies, H., Maier, W. and Garbe-Schönberg, D., 2021. Convective isolation of Hadean mantle reservoirs through Archean time. Proceedings of the National Academy of Sciences, 118(2), no.e2012626118. Yours, Paul H.
  4. Oxytropidoceras
    A delightful open access paper is: De Winter, N.J., Vellekoop, J., Clark, A.J., Stassen, P., Speijer, R.P. and Claeys, P., 2020. The giant marine gastropod Campanile giganteum (Lamarck, 1804) as a high‐resolution archive of seasonality in the Eocene greenhouse world. Geochemistry, Geophysics, Geosystems, 21(4), p.e2019GC008794. Researchgate PDF file More Publications of Dr. Niels de Winter Discovery and preparation of Campanile giganteum from Lutetian of Fleury-la-Rivière (France) Fossil Forum Yours, Paul H.
  5. Oxytropidoceras
    Some of the world’s oldest rubies linked to early life Carbon residue that was once ancient life found encased in a 2.5 billion-year-old ruby, University of Waterloo Ancient Traces of Life Discovered Encased in a 2.5 Billion-Year-Old Ruby SciTechDaily, October 24, 2021 2.5 billion-year-old traces of life locked inside primeval ruby "The graphite inside this ruby is really unique." By Yasemin Saplakoglu , October 24, 2021 The paper is: Yakymchuk, C., van Hinsberg, V., Kirkland, C.L., Szilas, K., Kinney, C., Kendrick, J. and Hollis, J.A., 2021. Corundum (ruby) growth during the final assembly of the Archean North Atlantic Craton, southern West Greenland. Ore Geology Reviews, no. 104417. Yours, Paul H.
  6. Oxytropidoceras
    The City of David in Jerusalem and the sharks' teeth mystery Eureka Alert, July 3, 2021 Phys.Org, July 4, 2021 SciTechDaily, July 3, 2021 The paper is: Tütken, T., Weber, M., Zohar, I., Helmy, H., Bourgon, N., Lernau, O., Jochum, K.P. and Sisma-Ventura, G., 2020. Strontium and oxygen isotope analyses reveal Late Cretaceous shark teeth in Iron Age strata in the Southern Levant. Frontiers in Ecology and Evolution, 8. Yours, Paul H.
  7. Oxytropidoceras
    First Humans in New England May Have Shared the Landscape With Woolly Mammoths Science Daily article, March 4, 2021, Dartmouth College Science Tech Daily article, March 4, 2021, Dartmouth College The paper is: Nathaniel R. Kitchel, Jeremy M. Desilva. 2021, First AMS radiocarbon date and stable C:N isotope analysis for the Mount Holly Mammoth, Vermont, USA. Boreas, Yorus, Paul H.
  8. Oxytropidoceras
    Earth's mountains disappeared for a billion years, and then life stopped evolving A dead supercontinent may be to blame By Brandon Specktor, Live Science Tang, M., Chu, X., Hao, J. and Shen, B., 2021. Orogenic quiescence in Earth’s middle age. Science, 371(6530), pp.728-731. Yorus, Paul H.
  9. Oxytropidoceras
    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.
  10. Oxytropidoceras
    How the moon formed: New research sheds light on what happened, Physorg, The Conversation https://phys.org/news/2020-03-moon.html https://phys.org/news/2020-03-earth-moon-identical-oxygen-twins.html The paper is: Cano, E.J., Sharp, Z.D. & Shearer, C.K. Distinct oxygen isotope compositions of the Earth and Moon. Nat. Geosci. (2020). https://doi.org/10.1038/s41561-020-0550-0 https://www.nature.com/articles/s41561-020-0550-0#citeas Yours, Paul H.
  11. Oxytropidoceras
    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. Oxytropidoceras
    Below is a fascinating lecture about Antarctica and sea level. The Big Antarctic Freeze, Geological Society of London Public Lectures 2019: Professor Carrie Lear, Cardiff University Published on Sep 23, 2019 https://www.youtube.com/watch?v=__3wrLCdVTQ A related article is: Evidence for past high-level sea rise Mallorcan cave yields 4-million-year-old geologic evidence providing new insights into magnitude global sea level rise, University of New Mexico, August 30, 2019 https://www.sciencedaily.com/releases/2019/08/190830150751.htm The paper is: Dumitru, O.A., Austermann, J., Polyak, V.J., Fornós, J.J., Asmerom, Y., Ginés, J., Ginés, A. and Onac, B.P., 2019. Constraints on global mean sea level during Pliocene warmth. Nature, pp.1-7. https://www.nature.com/articles/s41586-019-1543-2 Yours, Paul H.
  13. Oxytropidoceras
    Diamonds reveal how continents are stabilized, key to Earth's habitability by Carnegie Institution for Science, PhysOrg, April 25, 2019 https://phys.org/news/2019-04-diamonds-reveal-continents-stabilized-key.html https://www.livescience.com/65327-diamond-flaws-reveal-early-geology.html The paper is: Karen V. Smit, Steven B. Shirey, Erik H. Hauri, and Richard A. Stern 2019, Sulfur isotopes in diamonds reveal differences in continent construction. Science 26 Apr 2019: Vol. 364, Issue 6438, pp. 383-385 DOI: 10.1126/science.aaw9548 https://science.sciencemag.org/content/364/6438/383 Also, there is: Lithospheric Diamonds / Continental Mantle https://sites.google.com/carnegiescience.edu/stevenbshirey/publications/lithospheric-diamondcontinental-mantle https://sites.google.com/carnegiescience.edu/stevenbshirey/home Yours, Paul H.
  14. Oxytropidoceras
    Belo are a great series of lectures (2016) that summarizes what is known and unknown about the Cryogenian. Earth Dynamics Research Group CCFS sponsored short course on Snowball Earth https://www.youtube.com/playlist?list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n Snowball Earth Lecture 1 - Snowball geology Earth Dynamics Research Group https://www.youtube.com/watch?v=RxFmcgjXtgI&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=2 Snowball Earth Lecture 2 - Snowball climate dynamics Earth Dynamics Research Group https://www.youtube.com/watch?v=8ZTR-DaT-w0&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=3 Snowball Earth Lecture 3 - Snowball geochemistry Earth Dynamics Research Group https://www.youtube.com/watch?v=AfC-YRLCKGU&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=4 Snowball Earth Lectures 4&5 - Snowball geobiology & The origin of Laurentia Earth Dynamics Research Group https://www.youtube.com/watch?v=vrjmSVcIGo0&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=5 Snowball Earth Lecture 6 - The Great Oxidation Event and a Siderian snowball earth Earth Dynamics Research Group https://www.youtube.com/watch?v=z2zXLswH02s&t=0s&list=PLb5FFe99h_Lg_t5_67MG1OIKMjOPqFS4n&index=6 Yours, Paul H.
  15. Oxytropidoceras
    Diamond’s 2-billion-year growth charts tectonic shift in early Earth’s carbon cycle, Europlanet Media Centre, February 23, 2017 http://www.europlanet-eu.org/2-billion-year-old-diamond/ http://www.europlanet-eu.org/wp-content/uploads/2017/02/catholuminescence_composite.jpg https://www.sciencedaily.com/releases/2017/02/170223102126.htm Timmerman, S., J.M. Koornneef, I.L. Chinn, G.R. Davies, 2017, Dated eclogitic diamond growth zones reveal variable recycling of crustal carbon through time. Earth and Planetary Science Letters, 2017; 463: 178 DOI: 10.1016/j.epsl.2017.02.001 http://www.sciencedirect.com/science/article/pii/S0012821X17300614 Yours, Paul H.
  16. Oxytropidoceras
    First nuclear explosion helps test theory of moon's formation By Annie Reisewitz, Univ. of California, San Diego, February 9, 2017 https://www.universityofcalifornia.edu/news/first-nuclear-explosion-helps-test-theory-moons-formation https://phys.org/news/2017-02-nuclear-explosion-theory-moon-formation.html Glass from nuclear test site shows the moon was born dry New Scientist, February 8, 2017 https://www.newscientist.com/article/2120748-glass-from-nuclear-test-site-shows-the-moon-was-born-dry/ Day, J. D. M., F. Moynier, A. P. Meshik, O. V. Pradivtseva, and D. R. Petit, 2017, Evaporative fractionation of zinc during the first nuclear detonation Science Advances. Vol. 3, no. 2, e1602668 DOI: 10.1126/sciadv.1602668 CCBY-NC http://advances.sciencemag.org/content/3/2/e1602668 http://advances.sciencemag.org/content/3/2/e1602668.full Yours, Paul H.
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