#proterozoic — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #proterozoic, aggregated by home.social.
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Mid-Proterozoic Expansion Of Passive Margins And Reduction In Volcanic Outgassing Supported Marine Oxygenation And Eukaryogenesis
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https://doi.org/10.1016/j.epsl.2025.119683 <-- shared paper
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https://zenodo.org/records/17353904 <-- supplementary data
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#proterozoic #platetectonics #tectonics #deepcarboncycle #eukaryogenesis #evolutionoflife #life #evolution #geology #geologichistory #pangea #supercontinent #diversification #volcanic #offgassing #marine #thermodynamics #model #modeling #spatialanalysis #spatiotemporal #nuna #subduction #structuralgeology #CO2 #carbondioxide #climate #eukaryotic #BoringBillion #rodinia #oceanbasins #marinechemistry #outgassing #global #earth -
Mid-Proterozoic Expansion Of Passive Margins And Reduction In Volcanic Outgassing Supported Marine Oxygenation And Eukaryogenesis
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https://doi.org/10.1016/j.epsl.2025.119683 <-- shared paper
--
https://zenodo.org/records/17353904 <-- supplementary data
--
#proterozoic #platetectonics #tectonics #deepcarboncycle #eukaryogenesis #evolutionoflife #life #evolution #geology #geologichistory #pangea #supercontinent #diversification #volcanic #offgassing #marine #thermodynamics #model #modeling #spatialanalysis #spatiotemporal #nuna #subduction #structuralgeology #CO2 #carbondioxide #climate #eukaryotic #BoringBillion #rodinia #oceanbasins #marinechemistry #outgassing #global #earth -
#WeekendReading: Canfield et al., looking at some proxy records for continental weathering to see how it changed between the #Proterozoic and #Phanerozoic, and how it might have affected the #sea.
https://www.pnas.org/doi/10.1073/pnas.2507312122 -
#WeekendReading: Canfield et al., looking at some proxy records for continental weathering to see how it changed between the #Proterozoic and #Phanerozoic, and how it might have affected the #sea.
https://www.pnas.org/doi/10.1073/pnas.2507312122 -
@KateShaw has made a new episode, featuring goblet-shaped Diskagma of the Paleoproterozoic, and Horodyskia of the Mesoproterozoic and Neoproterozoic.
https://strangeanimalspodcast.blubrry.net/2025/08/04/episode-444-diskagma-and-horodyskia/
#fossils
#preCambrian
#proterozoic
#Paleoproterozoic
#Mesoproterozoic
#Neoproterozoic
#Ediacaran -
@KateShaw has made a new episode, featuring goblet-shaped Diskagma of the Paleoproterozoic, and Horodyskia of the Mesoproterozoic and Neoproterozoic.
https://strangeanimalspodcast.blubrry.net/2025/08/04/episode-444-diskagma-and-horodyskia/
#fossils
#preCambrian
#proterozoic
#Paleoproterozoic
#Mesoproterozoic
#Neoproterozoic
#Ediacaran -
Boring Billion (Geological periods 🌍)
The Boring Billion, otherwise known as the Mid Proterozoic and Earth's Middle Ages, is an informal geological time period between 1.8 and 0.8 billion years ago during the middle Proterozoic eon spanning from the Statherian to the Tonian periods, characterized by more or less tectonic stability, climatic stasis and slo...
https://en.wikipedia.org/wiki/Boring_Billion
#BoringBillion #Proterozoic #Astrobiology #1995InScience #PlateTectonics #GeologicalPeriods
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Volyn biota (Ecosystems 🏞️)
The Volyn biota are fossilized microorganisms found in rock samples from miarolitic cavities of igneous rocks collected in Zhytomyr Oblast, Ukraine. It is within the historical region of Volyn, hence the name of the find. Exceptionally well-preserved, they were dated to 1.5 Ga, within the "Boring Billion" period of the Proterozoic geological eon.
https://en.wikipedia.org/wiki/Volyn_biota
#VolynBiota #Volhynia #Ecosystems #Lithophiles #Proterozoic #ZhytomyrOblast
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A very productive hour spent learning about Earth's primary productivity (organic molecules produced) over time via a talk by Peter Crockford, Carleton University.
Fun fact: every carbon atom has likely be cycled through an organism ~100 times over the last 3+ billion years!
Crockford et al., The geologic history of primary productivity, Current Biology (2023), https://doi.org/10.1016/ j.cub.2023.09.040
#CarletonU #McGillUniversity #Photosynthesis #EarthSystemScience #Proterozoic #Geology
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A very productive hour spent learning about Earth's primary productivity (organic molecules produced) over time via a talk by Peter Crockford, Carleton University.
Fun fact: every carbon atom has likely be cycled through an organism ~100 times over the last 3+ billion years!
Crockford et al., The geologic history of primary productivity, Current Biology (2023), https://doi.org/10.1016/ j.cub.2023.09.040
#CarletonU #McGillUniversity #Photosynthesis #EarthSystemScience #Proterozoic #Geology
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#Mafic enclave (?) in Rattlesnake Hill #Granite, #Massachusetts
This Devonian granite intrudes #Proterozoic Dedham Granite south of #Boston. It is younger than the nearby Blue Hill Granite Porphyry. The triangular area is rich in large crystals, possibly hornblende. The blue crystals at lower left may be #riebeckite, another amphibole. Riebeckite gives Quincy Granite and the #BlueHills Range their distinctive color. All on Avalon terrane, out of Gondwana. Acadian Orogeny was Devonian. My #photo
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#Mafic enclave (?) in Rattlesnake Hill #Granite, #Massachusetts
This Devonian granite intrudes #Proterozoic Dedham Granite south of #Boston. It is younger than the nearby Blue Hill Granite Porphyry. The triangular area is rich in large crystals, possibly hornblende. The blue crystals at lower left may be #riebeckite, another amphibole. Riebeckite gives Quincy Granite and the #BlueHills Range their distinctive color. All on Avalon terrane, out of Gondwana. Acadian Orogeny was Devonian. My #photo
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Above and upon #igneous #dikes
The feature sure looked like a #dike on #satellite view, and a ground check confirmed it. Probably a late #Triassic or early #Jurassic intrusion into #Proterozoic Dedham #Granite, as #Pangea rifted. At Black Rock #Beach, #Hingham, #Massachusetts, #NewEngland #geology USA.
Satellite view from #AppleMaps, #photo by me.
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Above and upon #igneous #dikes
The feature sure looked like a #dike on #satellite view, and a ground check confirmed it. Probably a late #Triassic or early #Jurassic intrusion into #Proterozoic Dedham #Granite, as #Pangea rifted. At Black Rock #Beach, #Hingham, #Massachusetts, #NewEngland #geology USA.
Satellite view from #AppleMaps, #photo by me.
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More #geotourism, this time in the lovely postglacial landscape of #Ontario, #Canada, specifically an island in #SandLake on the #RideauCanal. Always amazing to consider that around 15,000 years ago this spot would have been under at least 1000 metres of ice.
The rocks at this spot are a mixture of #Proterozoic metasediments of the Grenville Supergroup - basically billion year old sedimentary rocks that were well baked and deformed by a major mountain building event that pre-dates the formation of Appalachian Mountains (which formed 'only' 250 million years ago).
And everything is pretty much covered in lichen... makes close-up images less interesting unfortunately :-)
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More #geotourism, this time in the lovely postglacial landscape of #Ontario, #Canada, specifically an island in #SandLake on the #RideauCanal. Always amazing to consider that around 15,000 years ago this spot would have been under at least 1000 metres of ice.
The rocks at this spot are a mixture of #Proterozoic metasediments of the Grenville Supergroup - basically billion year old sedimentary rocks that were well baked and deformed by a major mountain building event that pre-dates the formation of Appalachian Mountains (which formed 'only' 250 million years ago).
And everything is pretty much covered in lichen... makes close-up images less interesting unfortunately :-)
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Katie Maloney spoke about the 950 million year old algae fossils from the Wernecke Mountains, Yukon Territory, Canada. She's reconstructing the biosphere and the spread of eukaryotes at a time before shells or any other hard parts evolved.
#McGillUniversity #EarthSystemScience #FossilFriday #Proterozoic #Yukon -
Katie Maloney spoke about the 950 million year old algae fossils from the Wernecke Mountains, Yukon Territory, Canada. She's reconstructing the biosphere and the spread of eukaryotes at a time before shells or any other hard parts evolved.
#McGillUniversity #EarthSystemScience #FossilFriday #Proterozoic #Yukon -
We walked around #Cohasset, #Massachusetts #USA in the unusually warm (50 F, 10 C) “winter” weather here in #NewEngland. This is an (absurdly) prosperous #coastal community just south of #Boston. The walk included lovely views across coves and marshes (including #invasive Phragmites australis and #peat under #native #Spartina), as well as nice exposures of the > 600 Ma #Dedham #granite, the #pluton coring most of the #Avalon terrane in this area.
#photo #igneous #Proterozoic #geology #saltMarsh -
We walked around #Cohasset, #Massachusetts #USA in the unusually warm (50 F, 10 C) “winter” weather here in #NewEngland. This is an (absurdly) prosperous #coastal community just south of #Boston. The walk included lovely views across coves and marshes (including #invasive Phragmites australis and #peat under #native #Spartina), as well as nice exposures of the > 600 Ma #Dedham #granite, the #pluton coring most of the #Avalon terrane in this area.
#photo #igneous #Proterozoic #geology #saltMarsh -
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When was the first time life began to prey on each other? https://phys.org/news/2022-12-life-began-prey.html
A case for an active #eukaryotic marine #biosphere during the #Proterozoic era: Lisa Eckford-Soper et al. https://www.pnas.org/doi/abs/10.1073/pnas.2122042119
"We use a size- & trait-based ecosystem model to show that the #microfossil record is most compatible with an active #eukaryote #ecosystem conducting #osmotrophy, #photosynthesis, #phagotrophy. Marine #ecosystems 1,700-780 Ma were far more active, diverse than generally thought."
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When was the first time life began to prey on each other? https://phys.org/news/2022-12-life-began-prey.html
A case for an active #eukaryotic marine #biosphere during the #Proterozoic era: Lisa Eckford-Soper et al. https://www.pnas.org/doi/abs/10.1073/pnas.2122042119
"We use a size- & trait-based ecosystem model to show that the #microfossil record is most compatible with an active #eukaryote #ecosystem conducting #osmotrophy, #photosynthesis, #phagotrophy. Marine #ecosystems 1,700-780 Ma were far more active, diverse than generally thought."
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One of my favourite #Fridayfold locations in the Åland Islands, between Finland and Sweden.
Flattened pillow lavas buckled by later minor folding.
#Proterozoic #SvecoFennian -
One of my favourite #Fridayfold locations in the Åland Islands, between Finland and Sweden.
Flattened pillow lavas buckled by later minor folding.
#Proterozoic #SvecoFennian
