Unaweep Canyon - Two Creeks Flow Out Of Either End Of This [Colorado] Canyon In Opposite Directions
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https://www.atlasobscura.com/places/unaweep-canyon <-- shared technical article
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https://doi.org/10.1130/GES01112.1 <-- shared paper
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[seems like a motorcycle road trip is in order - and happy to visit this beautiful part of the world again]
#geology #colorado #paleovalley #UnaweepCanyon #unaweep #precambrian #unique #divide #water #hydrology #underfit #drainage #EastCreek #WestCreek #Dolores #Uncompahgre #UncompahgrePlateau #erosion #Gunninson #canyon #Tabeguache #mapping #geologicmapping #fieldwork #Cenozoic #gravel #sediment #rockcore #coring #lacustrine #geomorphology #geomorphometry #dating #landform #volcanics #tectonics

Most animal body forms first appear in the fossil record in the Cambrian era, already in a recognisable form. This makes new fossils from Pre-Cambriam very exciting, like this tiny ancestor of the arthropods.
https://www.eurekalert.org/news-releases/1068455
#fossil #sciencenews #precambrian #paleontology #biology #evolution

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

Late #Cretaceous and Early #Paleogene Fluid Circulation and Microbial Activity in Deep Fracture Networks of the #Precambrian Basement of Western Greenland https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GC011646

"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."

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:

https://www.sciencedirect.com/science/article/abs/pii/S0301926824001669

No free version, unfortunately, until 2025.

#Precambrian

Always a good question, but context here is important, too. #bear #writing #evolution #Precambrian https://flighttowonder.com/2024/06/28/writing-update-why-bears/

#Mailorder

#DarkAges Twilight Of Europe
5€+🚚

Featuring members from #Drudkh #Precambrian #Rattenfänger #Unfelled #HareForest
Very damn good #DarkAmbient #DungeonSynth

Via #WerewolfPromotion

war-productions.org

#WarProductions
#SupportTheUnderground

https://www.sciencedaily.com/releases/2024/01/240124132716.htm

#palaeoarchaean #precambrian #evolution #biology

Plate tectonics in the Archean: Observation versus interpretation
https://phys.org/news/2024-01-plate-tectonics-archean.html #PlateTectonics #Archean #Precambrian #Phanerozoic

@deuxcvsix

🤔-PS Ich bin übrigens nicht #Precambrian sondern bi: #Paleogene und #Neogene

Jedem Tierchen sein Plasierchen 🙃

Discovery of oldest 3D-preserved #microorganisms.

#fossil #precambrian

https://phys.org/news/2023-07-discovery-oldest-3d-preserved-microorganisms.html

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.

https://plantsandrocks.blogspot.com/2015/01/the-sandstone-that-fooled-great.html

#GreenRiver #BrownsPark #OutlawTrail #geology #precambrian #sandstone #metamorphic

For a billion years, Earth may have had 19-hour days. Here's why.
Days were once five hours shorter than they are now due to the moon's proximity to Earth, a new study suggests.
https://www.livescience.com/space/the-moon/for-a-billion-years-earth-may-have-had-19-hour-days-heres-why #BoringBillion #geology #precambrian #days #moon

https://youtu.be/p0Sm179PlMw #preCambrian #complexlife #paleontology

A ‘lost world’ of early microbes thrived one billion years ago
Fat-like compounds in ancient rocks point to a vast array of previously unknown microorganisms that once dominated complex life on Earth.
https://www.nature.com/articles/d41586-023-01847-8 #precambrian #microbes #fat #organics

An awesome present from Australia - a lump of Proterozoic banded ironstone from the Marra Mamba Iron Formation (Hamersley region, Pilbara Craton, WA) - 2.4 billion years old.
Layered haematite & chert are evidence of fluctuations in primordial ocean oxygenation. #precambrian #proterozoic #geology

#Benthic species, Latibolivina subreticulata as #TheOceans' #Precambrian #foraminifera

A bit of #PreCambrian #Geology for a #SundayMorning. Between North and Tank Quarries, north #MalvernHills #Worcestershire. #IndustrialArchaeology #Rock #Quarry #Lichen

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.

https://en.wikipedia.org/wiki/Charnia#Discovery

#fossils #precambrian #sexism #paleontology

A sprinkling of #snow made for a beautiful #sunset on the crags and Jewels Hill rocks of Beacon Hill (which are #SSSI & #Precambrian) #LOUGHBOROUGH this evening ❄️🌄