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Found 6 results

  1. 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.
  2. Aloha, here is the best of my collection. Since I moved together with my girlfriend, only the small and nice samples are on display, one showcase out of three. Looking forward to the day when we will have some more space. So it is a crowded mix of fossils, minerals, recent beachfinds and mosty selfmade or altered skeleton models. Sadly, only a small percentage of my fossils is selffound, although nearly all of the beach stuff is. There is the "poultry showcase", dedicated to Birds and pterosaurs (Parrot skull is a replica of course, as is the Pterosaur plate regrettably) The big showcase is a composite image because I could not get all into one foto. The whales you may know from the Palaeorecreation thread. Best Regards, J
  3. Oldest meteorite collection on Earth found in one of the driest places, Geological Society of America Sciencedaily, May 23, 2019 https://www.sciencedaily.com/releases/2019/05/190523130200.htm Earth's Oldest Meteorite Collection Just Found in the Driest Place on the Planet By Brandon Specktor, May 24, 2019 https://www.livescience.com/65558-atacama-desert-has-meteors-for-days.html The paper is: A. Drouard, J. Gattacceca, A. Hutzler, P. Rochette, R. Braucher, D. Bourlès, ASTER Team, M. Gounelle, A. Morbidelli, V. Debaille, M. Van Ginneken, M. Valenzuela, Y. Quesnel, R. Martinez. The meteorite flux of the past 2 m.y. recorded in the Atacama Desert. Geology, May 22, 2019. Open Access https://pubs.geoscienceworld.org/gsa/geology/article/570818/the-meteorite-flux-of-the-past-2-m-y-recorded-in https://arxiv.org/abs/1904.12644 Yours, Paul H.
  4. Evidence suggests life on Earth started after meteorites splashed into warm little ponds, PhysOrg, October 2, 2017 https://phys.org/news/2017-10-evidence-life-earth-meteorites-splashed.html How did Life Start? Meteorites crashing into Darwin's Little Warm Ponds May Have been Trigger, by Megham Bartels, Newsweek. http://www.newsweek.com/2017/10/27/how-did-life-start-meteorites-crashing-darwins-warm-little-ponds-was-possible-675655.html The paper is: Pearce, B.K., Pudritz, R.E., Semenov, D.A. and Henning, T.K., 2017. Origin of the RNA world: The fate of nucleobases in warm little ponds. Proceedings of the National Academy of Sciences, vol. 114 no. 43, pp. 11327-11332 http://www.pnas.org/content/114/43/11327 https://arxiv.org/pdf/1710.00434.pdf Yours, Paul H.
  5. Myth busted: No link between gigantic asteroid break-up, rise in biodiversity, University of Copenhagen, February 3, 2017 https://www.sciencedaily.com/releases/2017/02/170203110156.htm https://phys.org/news/2017-01-meteorites-enrich-ocean-life.html the paper is; Lindskog, A., M. M. Costa, C.M.Ø. Rasmussen, J. N. Connelly, and M. E. Eriksson, 2017, Refined Ordovician timescale reveals no link between asteroid breakup and biodiversification. Nature Communications, 2017; 8: 14066 DOI: 10.1038/ncomms14066 http://www.readcube.com/articles/10.1038/ncomms14066 http://www.nature.com/articles/ncomms14066 Yours, Paul H.
  6. Meteorites & Gravity

    Could all of the large meteorite impacts, especially the one(s) that drove the dinosaurs to extinction, increase the earths gravity? And if so is it likely this is a big factor in the next evolutionary step for dinosaurs, feathered flight?
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