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Showing results for tags 'cyanobacteria'.
Found 10 results
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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 Missour-
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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 -
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 cast
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Is this sample from northcentral Indiana a stromatolite? Thanks in advance!
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Ordovician STROMATOLITES to trade.
WI-fossil-guy posted a topic in Member Fossil Trades Bulletin Board
Would anyone be interested in trading for high quality unpolished Ordovician STROMATOLITES of various sizes from a few ounces to up to ten pounds in weight? Fossils have been collected in Wisconsin USA (from the Oneota Formation). I have a large number of every size from a few ounces to ten pounds. Most all contain classic stromatolite features including concave (dome-like) tops, concave bottoms and multiple apical laminae (visible from side-view). I am attaching representative photos of a few specimens. Many more are available based on what you may desire. Additional photos can be sent. -
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 wor
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Biomarkers helped solve the mystery of 500-million-year-old macroorganisms
Oxytropidoceras posted a topic in Fossil News
Biomarkers helped solving the mystery of 500-million-year-old macroorganisms, Lomonosov Moscow State University, January 23, 2018, https://phys.org/news/2018-01-biomarkers-mystery-million-year-old-macroorganisms.html Bobrovskiy, I., Hope, J.M., Krasnova, A., Ivantsov, A. and Brocks, J.J., 2018. Molecular fossils from organically preserved Ediacara biota reveal cyanobacterial origin for Beltanelliformis. Nature Ecology & Evolution, Received: 16 July 2017 Accepted: 04 December 2017 Published online: 22 January 2018 https://www.nature.com/article -
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.
