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Showing results for tags 'microbial mats'.
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Oldest known archaea microbes? (Barberton greenstone belt, South Africa)
Oxytropidoceras posted a topic in Fossil News
3.42-billion-year-old fossil threads may be the oldest known archaea microbes. The structure and chemistry of the filaments hints that they may be ancient cells. By Carolyn Wilke, Science News, July 26, 2021 Cavalazzi, B., Lemelle, L., Simionovici, A., Cady, S.L., Russell, M.J., Bailo, E., Canteri, R., Enrico, E., Manceau, A., Maris, A. and Salomé, M., 2021. Cellular remains in a~ 3.42-billion-year-old subseafloor hydrothermal environment. Science Advances, 7(29), p.eabf3963. Yours, Paul H.-
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- barberton greenstone belt
- south africa
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We may Finally know what life on Earth breathed before there was oxygen By Carly Cassella, ScienceAlert The open access paper is: Visscher, Pieter T., Kimberley L. Gallagher, Anthony Bouton, Maria E. Farias, Daniel Kurth, Maria Sancho-Tomás, Pascal Philippot et al. "Modern arsenotrophic microbial mats provide an analogue for life in the anoxic Archean." Communications Earth & Environment 1, no. 1 (2020): 1-10. Yours, Paul H.
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- laguna la brava
- microbial mats
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Problematic Mesoproterozoic fossil Horodyskia, Belt Supergroup, western North America
Oxytropidoceras posted a topic in Fossil News
Rule, R.G. and Pratt, B.R., 2019. The pseudofossil Horodyskia: Flocs and flakes on microbial mats in a shallow Mesoproterozoic sea (Appekunny Formation, Belt Supergroup, western North America). Precambrian Research, 333, p.105439. Archived PDF file More papers by Brian R. Pratt Retallack, G.J., Dunn, K.L. and Saxby, J., 2013. Problematic Mesoproterozoic fossil Horodyskia from Glacier National Park, Montana, USA. Precambrian Research, 226, pp.125-142. Archived PDF file Yours, Paul H.-
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- pseudofossi
- horodyskia
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I found the silicified and brecciated laminar structures in Miocene lake deposits north of Phoenix, Arizona. Could they be disturbed algal mats? I envision a drying algal mat in a lake that is disturbed by an event such as a flood, windstorm, landslide or earthquake. Compare to Kinneyia trace fossil: https://woostergeologists.scotblogs.wooster.edu/2015/10/23/woosters-fossil-maybe-of-the-week-kinneyia-ripples/ Confirmed stromatolites occur nearby in the lake sediments. Photo 1: typical wrinkled/ cracked marks in surface of laminar structures. Photo 2: typical piece of folded and brecciated laminar structures. Photo 3: detail of photo 2. Photo 4: edge of rock in photo 2. 4.5 cm field of view. Photo 5: Another piece. Photo 6: detail of photo 5. Photo 7: edge of photo 5. 3 cm field of view.
- 2 replies
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- miocene
- stromatolites
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