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Showing results for tags 'neoproterozoic'.
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Are sponges a major source of Neoproterozoic C30 steranes?
Oxytropidoceras posted a topic in Fossil News
Great virtual talk about using biomarkers to determine the presence of sponges in the Neoproterozoic. What are the major sources of Neoproterozoic C30 steranes? Gordon Love, University of California, Riverside Virtual Seminars in Precambrian Geology, December 2, 2022 In addition, starting at 53:30, Dr. Love presents very specific arguments about why the cholestane biomarker recovered from fossils of White Sea Dickinsonia fossils are Quaternary contaminates and are not in any way associated with them. If so, this renders the arguments about whether the cholestane biomarker indicates Dickinsonia is an animal rather moot. The original Fossil Forum post is: Dickinsonia steroids not unique to animals The original papers are: Bobrovskiy, I., Hope, J.M., Ivantsov, A., Nettersheim, B.J., Hallmann, C. and Brocks, J.J., 2018. Ancient steroids establish the Ediacaran fossil Dickinsonia as one of the earliest animals. Science, 361(6408), pp.1246-1249. and Retallack, G.J., 2022. Damaged Dickinsonia specimens provide clues to Ediacaran vendobiont biology. Plos one, 17(6), p.e0269638. More of Bobrovskiy’s papers More of Rettalack’s papers Yours, Paul H.-
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Supermountains might have affected the evolution of life on Earth
Oxytropidoceras posted a topic in Fossil News
Supermountains controlled the evolution of life on Earth Australian National University, February 2, 2022 EurekaAlert posting Scientists discover lost range of 'supermountains' three times longer than the Himalayas By Brandon Specktor, Live Science, February 4, 2022 The destruction of these ancient mountains may have fueled Earth's biggest evolution booms. Selected papers: Zhu, Z., Campbell, I.H., Allen, C.M., Brocks, J.J. and Chen, B., 2022. The temporal distribution of Earth's supermountains and their potential link to the rise of atmospheric oxygen and biological evolution. Earth and Planetary Science Letters, 580, p.117391. Squire, R.J., Campbell, I.H., Allen, C.M. and Wilson, C.J., 2006. Did the Transgondwanan Supermountain trigger the explosive radiation of animals on Earth?. Earth and Planetary Science Letters, 250(1-2), pp.116-133. Yorus, Paul H.- 2 replies
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When did Life Arrive on Land? (Organic-walled microfossils, *FUNGI* Arctic, Canada)
Oxytropidoceras posted a topic in Fossil News
How Did Life Arrive on Land? A Billion-Year-Old Fungus May Hold Clues A cache of microscopic fossils from the Arctic hints that fungi reached land long before plants. Carl Zimmer, New York Times, May 22, 2019 https://www.nytimes.com/2019/05/22/science/fungi-fossils-plants.html The paper is: Loron, C.C., Rainbird, R.H., Turner, E.C., Greenman, J.W. and Javaux, E.J., 2019. Organic-walled microfossils from the late Mesoproterozoic to early Neoproterozoic lower Shaler Supergroup (Arctic Canada): Diversity and biostratigraphic significance. Precambrian Research, 321, pp.349-374. https://www.researchgate.net/publication/329839018_Organic-walled_microfossils_from_the_late_Mesoproterozoic_to_early_Neoproterozoic_lower_Shaler_Supergroup_Arctic_Canada_Diversity_and_biostratigraphic_significance https://www.researchgate.net/profile/Corentin_Loron https://www.researchgate.net/profile/J_Wilder_Greenman https://www.sciencedirect.com/science/article/pii/S030192681830216X Yours, Paul H.- 15 replies
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Neoproterozoic glacial origin of the Great Unconformity
Oxytropidoceras posted a topic in Fossil News
Researchers suggest missing crust layer can be blamed on 'Snowball Earth' January 3, 2019 by Bob Yirka, Phys.org https://phys.org/news/2019-01-crust-layer-blamed-snowball-earth.html Around the world, miles of rock are missing. Could ‘Snowball Earth’ be the culprit? by Julian Rosen, Los Angeles Times, January 3, 2019 https://www.latimes.com/science/sciencenow/la-sci-sn-snowball-earth-geology-20190103-story.html the paper is: C. Brenhin Keller et al. Neoproterozoic glacial origin of the Great Unconformity, Proceedings of the National Academy of Sciences (2019). DOI: 10.1073/pnas.1804350116 https://www.pnas.org/content/early/2018/12/26/1804350116 Yours, Paul H.-
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