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Showing results for tags 'proterozoic'.
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Origin of metazoans as recorded by small carbonaceous fossils - 2022 open access review paper
Oxytropidoceras posted a topic in Fossil NewsThe comprehensive, open access review paper is: Slater, B.J. and Bohlin, M.S., 2022. Animal origins: The record from organic microfossils. Earth-Science Reviews, 232, no. 104107. open access review paper A related video. Possible sponge fossils in the Tonian of northwestern Canada, Elizabeth Turner, Laurentian University, Virtual Seminars in Precambrian Geology Turner's open access paper is: Turner, E.C., 2021. Possible poriferan body fossils in early Neoproterozoic microbial reefs. Nature, 596(7870), pp.87-91.
Ancient Planet CGI Documentary
3depix posted a topic in Paleo Re-creations3D documentary I have been working on for the last 3 years is finally released! It is called Ancient Planet and tells the the story of Earth from the its formation in the Hadean Eon, until the end of the Proterozoic with its mysterious Ediacaran organisms. All 3 episodes are available for watching on Tubi service, which is completely free, just requires registration: https://tubitv.com/series/300007201/ancient-planet-trilogy?start=true
Precambrian Slowdown in Earth’s Rotation Could Have Affected the Oxygen Content of the Atmosphere
Oxytropidoceras posted a topic in Fossil NewsA Slowdown in Earth’s Rotation Could Have Affected the Oxygen Content of the Atmosphere Max Planck Institute, August 2, 2021 The open access paper is: Klatt, J.M., Chennu, A., Arbic, B.K. et al., 2021 Possible link between Earth’s rotation rate and oxygenation. 2 August 2021, Nature Geoscience. DOI: 10.1038/s41561-021-00784-3 A fascinating talk about variations in tides and non-uniform rates of change in Earth's rotation is: A journey through tides in Earth's History Mattias Green, Seds Online, Oct 22, 2000
Billion-year-old, freshwater, multicellular microfossils reported from the Torridonian sequence of the Northwest Scotland
Oxytropidoceras posted a topic in Fossil NewsOne Billion-Year-Old Fossil Could Be The Oldest Multicellular Animal. David Bressan, Forbes, April 30, 2021 https://www.forbes.com/sites/davidbressan/2021/04/30/one-billion-year-old-fossil-could-be-the-oldest-multicellular-animal/ The open access paper is: Strother, P.K., Brasier, M.D., Wacey, D., Timpe, L., Saunders, M. and Wellman, C.H., 2021. A possible billion-year-old holozoan with differentiated multicellularity. Current Biology. https://www.sciencedirect.com/science/article/pii/S0960982221004243 https://www.cell.com/current-b
Earth's mountains disappeared for a billion years, and then life stopped evolving
Oxytropidoceras posted a topic in Fossil NewsEarth'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.
Sinopaleus posted a fossil in Other InvertebratesGenerally accepted to be one of the earliest eukaryotes, these spiral ribbons are also the oldest macroscopic body fossils known to date. The Negaunee Fm. has been dated to 2.11 billion years old, but new studies suggest the unit is 1.87 billion years old. These ribbons are most simply referred to as a form of archaic alga, and existed when increasing oxygen levels caused global rusting of the oceans, also resulting in the extinction of other lifeforms unable to adapt to the then-toxic levels of oxygen.
New research supports existence of Scottish impact crater
Oxytropidoceras posted a topic in Fossil NewsBiggest Meteorite Impact in the UK Found Buried in Water and Rock https://www.sciencedaily.com/releases/2019/06/190610085903.htm https://www.livescience.com/65679-biggest-meteorite-impact-uk.html https://www.space.com/scotland-biggest-meteorite-crater-uk-discovery.html The paper is: Kenneth Amor, Stephen P. Hesselbo, Don Porcelli, Adam Price, Naomi Saunders, Martin Sykes, Jennifer Stevanović and Conal MacNiocaill, 2019, The Mesoproterozoic Stac Fada proximal ejecta blanket, NW Scotland: constraints on crater location from field obs
Evidence of a Limited Biosphere 1.4 Billion Years Ago
Oxytropidoceras posted a topic in Fossil NewsEvidence of a Limited Biosphere 1.4 Billion Years Ago Louisiana State University and McGill University https://www.mcgill.ca/newsroom/channels/news/billion-year-old-lake-deposit-yields-clues-earths-ancient-biosphere-288081 https://www.lsu.edu/mediacenter/news/2018/07/23gg_hayles_bao_nature.php The paper is: Crockford, P.W., Hayles, J.A., Bao, H., Planavsky, N.J., Bekker, A., Fralick, P.W., Halverson, G.P., Bui, T.H., Peng, Y. and Wing, B.A., 2018. Triple oxygen isotope evidence for limited mid-Proterozoic primary productivity. Natu
How Did Early Earth Stay Warm?
Oxytropidoceras posted a topic in Fossil NewsMethane muted: How did early Earth stay warm? University of California, Riverside, October 7, 2016 http://sciencebulletin.org/archives/6111.html https://www.sciencedaily.com/releases/2016/10/161007090659.htm http://astrobiology.com/2016/10/how-did-early-earth-stay-warm.html The paper is: Olson, S. L., Christopher T. Reinhard, and T. W. Lyons, 2016, Limited role for methane in the mid-Proterozoic greenhouse. Proceedings of the National Academy of Sciences, USA. 201608549 DOI: 10.1073/pnas.1608549113 http:/