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How are dinosaur tissues preserved in deep time? by Tracey Peake, North Carolina State University, PhysOrg, May 1, 2023 The open access paper is: Anderson, L.A., 2023. A chemical framework for the preservation of fossil vertebrate cells and soft tissues. Earth-Science Reviews, no. 104367. Yours, Paul H.
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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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They both have potassium. New way to look for ancient fossils 2+ billion years old. https://m.phys.org/news/2019-07-scientists-method-early-life-ancient.html
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- ancient fossils
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