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#precambrian

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Lukas VFN 🇪🇺

First evidence of life colonizing deep into the bedrock of Greenland phys.org/news/2024-09-evidence

Late #Cretaceous and Early #Paleogene Fluid Circulation and Microbial Activity in Deep Fracture Networks of the #Precambrian Basement of Western Greenland agupubs.onlinelibrary.wiley.co

"These ages overlap with tectonic events related to the opening of the Atlantic Ocean... deep fracture networks in western #Greenland opened and were colonized by #microbes, such as sulfate reducers, during these events."

photo of cylindrical rock cores with markings ion them
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Paul Drye

For years I've been keeping an eye on the disputed Francevillian biota -a possible experiment in multicellular life that well pre-dated the Ediacaran/Cambrian foray we all see today.

Recently we got a new paper on the subject suggesting that it existed in an inland sea cut off from the wider world, which prevented it from thriving and led to its extinction when O2 levels in the atmosphere went south again:

sciencedirect.com/science/arti

No free version, unfortunately, until 2025.

#Precambrian
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rlfswdn

sciencedaily.com/releases/2024

ScienceDailyNew pieces in the puzzle of first life on EarthMicroorganisms were the first forms of life on our planet. The clues are written in 3.5 billion-year-old rocks by geochemical and morphological traces, such as chemical compounds or structures that these organisms left behind. However, it is still not clear when and where life originated on Earth and when a diversity of species developed in these early microbial communities. Evidence is scarce and often disputed. Now, researchers have uncovered key findings about the earliest forms of life. In rock samples from South Africa, they found evidence dating to around 3.42 billion years ago of an unprecedentedly diverse carbon cycle involving various microorganisms. This research shows that complex microbial communities already existed in the ecosystems during the Palaeoarchaean period.
#palaeoarchaean#precambrian#evolution
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flug

More from our visit to Crouse Canyon in the eastern #UintaMountains of #DaggettCounty #Utah. FYI the red sandstone formation you see throughout is the Uinta Mountain Formation, which has been called "the sandstone that fooled the great geologists".

Powell, Hayden, Emmons, and King all thought the rock was mid-Paleozoic but in fact it is *Pre-Cambrian*.

TLDR: They thought it was about 400 million years old but in fact it is 650 million - 2.5 billion years old. So they were off by a bit.

The Crouse Canyon formation here is about 800 million years old.

What is unusual for rock this old is that is it is mainly plain old sedimentary sandstone. Strange for rock buried 15-20,000 feet deep for several hundred million years. Some deeper/old layers are partially or completely metamorphosed, but these upper layers are not.

plantsandrocks.blogspot.com/20

#GreenRiver#BrownsPark#OutlawTrail
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Talya (she/her) 🏳️‍⚧️✡️

TIL that the first pre-#cambrian #fossil, Charnia masoni, was originally discovered by a 15 years old girl named Tina Negus, who was discounted by her geography teacher saying precambrian fossils were impossible.
A year later it was rediscovered by a boy named Roger Mason, who also took a stone rubbing of the fossil. This time the discovery was taken seriously, and the species is even named "masoni" to this day after him.

en.wikipedia.org/wiki/Charnia#

en.wikipedia.orgCharnia - Wikipedia
#fossils#precambrian#sexism
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