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Showing results for tags 'cyanobacteria'.
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From the album: Wheeler Formation fossils from the Wheeler Range, UT USA
Specimens of mats of the cyanobacterium Morania fragmenta, preserved as small, featureless carbonaceous patches. In the middle specimen they form a dense lawn over the entire surface. Collected at A New Dig Quarry more or less as is.© CC-BY
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Stromatolites coming from Alebastrovo, Perm Krai (Russia). Roadian (Ufimian in Russia) stage of the Permian. The taxon is named both after the settlement Alebastrovo and the river Sylva. Alebastrophyton sylvensis in the middle, with a conifer branch and a Rufloria sp. leaf right under it. A Psygmophyllum expansum leaf can be seen on the right. A fossil in situ.
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A rangeomorph holdfast trace fossil from the Ediacara formation, Rawnsley quartzite of the Flinders Range, South Australia. This specimen is Medusina mawsoni, so called because it was until recently thought to be a jellyfish, but is now believed to be the attachment point of a fractal rangeomorph as Charniodiscus is the point of anchorage for Charnia sp. This one may have been the holdfast point for some species of Rangea. The diameter of the outer circle is 1.5 cm and the fossil is estimated to be 555 million years old.
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Hello all, I feel like I've hit the jackpot finding this forum. I have quite a few pieces needing identified. I am so excited to be here. Please stay tuned as I have read the suggestions on how to photograph specimens, so I will be working on those pics over the next few days. Thank you for having me. I can't wait to learn from each of you.
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Just a note that James Cullison's 1944 monograph on the rocks and fauna of the upper Lower Ordovician of Missouri and Arkansas is now freely available for download or perusal at https://archive.org/details/paper-cullison-1944-the-stratigraphy-of-some-lower-ordovician-formations-of-the This publication has always been devilishly tough to get a hold of. A nice systematic paleontology section deals with the many gastropods and other mollusks as well as the less diverse brachiopods, trilobites, and sponges. The monograph covers the following formations as currently accepted in Missouri: • Smithville Formation • Powell Formation • Cotter Formation • Jefferson City Formation Enjoy and share as you like. Full citation: J. S. Cullison, 1944: "The Stratigraphy Of Some Lower Ordovician Formations Of The Ozark Uplift." The University of Missouri School of Mines and Metallurgy Bulletin Technical Series, Vol. 15, No. 2, 112 pp + 35 pl.-
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Precambrian Slowdown in Earth’s Rotation Could Have Affected the Oxygen Content of the Atmosphere
Oxytropidoceras posted a topic in Fossil News
A 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 and Blackledge, B.W., Green, J.A.M., Barnes, R. and Way, M.J., 2020. Tides on Other Earths: Implications for Exoplanet and Palaeo‐Tidal Simulations. Geophysical Research Letters, 47(12), p.e2019GL085746. Yours, Paul H. -
Hello guys! Please advise if this is a geological formation, or if there is any organic activity - cyanobacteria? Thanks! N.1 N.2 N.3
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This silicified lacustrine Miocene stromatolite is a trace fossil made by a gram-negative photosynthetic blue-green bacteria. The originally limestone stromatolite was formed as a bacterial mat trapped sediment and precipitated limestone as it grew from the lake floor towards the sun. It shows classic convex layering towards the top. The stromatolites occur in tuffaceous and lime rich lake sediments that might be part of the Chalk Canyon Formation that is bounded on the bottom by basaltic lava and volcanic rich conglomerate and sandstone on the top. Locally numerous silicified casts and molds of reed like plants, their roots, and palm wood occur in the lacustrine sediments. Since the area is under possible scientific investigation I will not give a more specific locality. The Arizona Museum of Natural History has fossils from the site per my showing them the site. The taxonomy is very unsettled as is the author of Cyanobacteria. Taxonomy per International Registry of Marine and Nonmarine Genera: https://www.irmng.org/aphia.php?p=taxdetails&id=110 See also: https://link.springer.com/article/10.1007/s10750-014-1971-9 “The cyanobacteria are named under Botanical and Bacteriological Codes, and the usage of both systems at the same time causes considerable confusion as the rules of the Botanical Code are quite different from those of the Bacteriological one.” Photo 1: detail of photo 2. Photo 2: 9” wide polished cross section cut and polished courtesy of Stan Celestian. Photo 3: 6” wide polished cross section of another side. Photo 4: top of colony. Photo 5: bottom of colony. Fossil Cyanobacteria & stromatolite overview: https://ucmp.berkeley.edu/bacteria/cyanofr.html Interesting paper that suggest Cyanobacteria created calcified structures because of interactions with viruses: White, R. A., 3rd, Visscher, P. T., & Burns, B. P. (2021). Between a Rock and a Soft Place: The Role of Viruses in Lithification of Modern Microbial Mats. Trends in microbiology, 29(3), 204–213. https://doi.org/10.1016/j.tim.2020.06.004 https://newsroom.unsw.edu.au/news/science-tech/stromatolites-–-fossils-earliest-life-earth-–-may-owe-existence-viruses
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Is this sample from northcentral Indiana a stromatolite? Thanks in advance!
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Has Anybody Found the Precambrian Fossils in Utah?
DeepTimeIsotopes posted a topic in Questions & Answers
So I've had a hankering for some Precambrian fossils. In Utah, according to this article, there is cyanobacteria fossils present in Utah. Does anybody have any examples of Cyanobacteria fossils that they'd like to show the world so I can have an idea what I'm looking for? If you know anything extra about localities or examples of the Red Pine Shale fossils and don't want to share with everybody we can PM. I'm just trying to get a feel for them before I head out. Thanks. -
Articles: Scientists discover the world's oldest colors “Scientists have discovered the oldest colors in the geological record, 1.1-billion-year-old bright pink pigments extracted from rocks deep beneath the Sahara desert in Africa.” Scientists discover world's oldest colour – bright pink ”Pigments found in 1.1bn-year-old rocks beneath the Sahara desert shed light on ‘major puzzle’ about early life” Scientists Discover The Oldest Color On Earth “Scientists from Australia, the United States and Japan have discovered the world’s oldest color: bright pink” Paper: 1.1-billion-year-old porphyrins establish a marine ecosystem dominated by bacterial primary producers Dr Amber Jarrett and Associate Professor Jochen Brocks at the Australian National University. Photograph: Stuart Hay/ANU Biogeochemistry Lab Manager Janet Hope from the ANU Research School of Earth Sciences holds a vial of pink colored porphyrins representing the oldest intact pigments in the world. Credit: The Australian National University
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Slide 1 I recently started reading up on stromatolites after I learnt that we have stromatolite formations and living tufa cyanobacteria colonies in the rocky beaches of Port Elizabeth, South Africa. The cyanobacteria found here are unique, their habitat is the semi-freshwater pools where freshwater from springs meet the sea where they line and grow on the submerged surfaces of the pools. The stromatolites have irregular forms and my observation is that quite often they are concave plates opposed to the more well known dome shaped forms. Here is a photo I took at Schoenmakerskop this morning. The cyanobacteria colony is in the centre and the stromatolite formations in the background Picture 1 I was wondering how it is that the reefs are often arranged in straight and parallel lines, some drama must have played off here over millions of years! Here is an example of the convex shaped plates (How old are they?) Picture 2
