#cryogenian — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #cryogenian, aggregated by home.social.
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https://www.europesays.com/ie/482226/ Earth’s Longest Ice Age May Have Repeatedly Thawed and Refrozen for 56 Million Years #AncientEarth #AtmosphericOxygen #BasaltWeathering #CarbonCycle #ClimateChange #Cryogenian #Éire #Exoplanets #FranklinLargeIgneousProvince #IE #Ireland #paleoclimate #Science #SnowballEarth #SturtianGlaciation #Volcanoes
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Snowball Earth wasn’t fully frozen: ice-free oases sheltered early life
#Science #SnowballEarth #Cryogenian #ClimateScience #EarthHistory #EarlyLife #Geology #GarvellachIslands #Sturtian #Marinoan #Paleoclimate #Nature
https://the-14.com/snowball-earth-wasnt-fully-frozen-ice-free-oases-sheltered-early-life/ -
Some 700 million years ago, #Earth would have looked like a blinding white #snowball.
During the #Cryogenian period, from 720 million to 635 million years ago, the Earth was buried by massive ice sheets that marched from the poles to the tropics.
Surface temperatures were as low as -50°C.
Because the bright, white surface of the #planet reflected the Sun’s energy – a phenomenon known as the albedo effect – the Earth remained locked in this extreme climate state for tens of millions of years.
This seems an unlikely cradle for #life, yet new evidence suggests the frozen #ocean featured restricted ice-free oases that provided a lifeline for our earliest complex ancestors.
#astrobiology #planets
https://theconversation.com/snowball-earth-wasnt-fully-frozen-ice-free-oases-sheltered-early-life-275240 -
Some 700 million years ago, #Earth would have looked like a blinding white #snowball.
During the #Cryogenian period, from 720 million to 635 million years ago, the Earth was buried by massive ice sheets that marched from the poles to the tropics.
Surface temperatures were as low as -50°C.
Because the bright, white surface of the #planet reflected the Sun’s energy – a phenomenon known as the albedo effect – the Earth remained locked in this extreme climate state for tens of millions of years.
This seems an unlikely cradle for #life, yet new evidence suggests the frozen #ocean featured restricted ice-free oases that provided a lifeline for our earliest complex ancestors.
#astrobiology #planets
https://theconversation.com/snowball-earth-wasnt-fully-frozen-ice-free-oases-sheltered-early-life-275240 -
Some 700 million years ago, #Earth would have looked like a blinding white #snowball.
During the #Cryogenian period, from 720 million to 635 million years ago, the Earth was buried by massive ice sheets that marched from the poles to the tropics.
Surface temperatures were as low as -50°C.
Because the bright, white surface of the #planet reflected the Sun’s energy – a phenomenon known as the albedo effect – the Earth remained locked in this extreme climate state for tens of millions of years.
This seems an unlikely cradle for #life, yet new evidence suggests the frozen #ocean featured restricted ice-free oases that provided a lifeline for our earliest complex ancestors.
#astrobiology #planets
https://theconversation.com/snowball-earth-wasnt-fully-frozen-ice-free-oases-sheltered-early-life-275240 -
Some 700 million years ago, #Earth would have looked like a blinding white #snowball.
During the #Cryogenian period, from 720 million to 635 million years ago, the Earth was buried by massive ice sheets that marched from the poles to the tropics.
Surface temperatures were as low as -50°C.
Because the bright, white surface of the #planet reflected the Sun’s energy – a phenomenon known as the albedo effect – the Earth remained locked in this extreme climate state for tens of millions of years.
This seems an unlikely cradle for #life, yet new evidence suggests the frozen #ocean featured restricted ice-free oases that provided a lifeline for our earliest complex ancestors.
#astrobiology #planets
https://theconversation.com/snowball-earth-wasnt-fully-frozen-ice-free-oases-sheltered-early-life-275240 -
Some 700 million years ago, #Earth would have looked like a blinding white #snowball.
During the #Cryogenian period, from 720 million to 635 million years ago, the Earth was buried by massive ice sheets that marched from the poles to the tropics.
Surface temperatures were as low as -50°C.
Because the bright, white surface of the #planet reflected the Sun’s energy – a phenomenon known as the albedo effect – the Earth remained locked in this extreme climate state for tens of millions of years.
This seems an unlikely cradle for #life, yet new evidence suggests the frozen #ocean featured restricted ice-free oases that provided a lifeline for our earliest complex ancestors.
#astrobiology #planets
https://theconversation.com/snowball-earth-wasnt-fully-frozen-ice-free-oases-sheltered-early-life-275240 -
Cryogenian (Geological periods 🌍)
The Cryogenian is a geologic period that lasted from 720 to 635 million years ago. It is the second of the three periods of the Neoproterozoic era, preceded by the Tonian and followed by the Ediacaran. The Cryogenian was a time of drastic climate changes. After the long environmental stability/stagnation during the Boring Billi...
https://en.wikipedia.org/wiki/Cryogenian
#Cryogenian #IceAges #Glaciology #Neoproterozoic #GeologicalPeriods #GeologyControversies
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Longer #SnowballEarth deglaciation could have driven multiple phases of #SeaLevelRise and fall https://phys.org/news/2024-12-longer-snowball-earth-deglaciation-driven.html
Melting the #Marinoan Snowball Earth: The impact of #deglaciation duration on the sea-level history of continental margins. By Freya Morris et al. https://www.sciencedirect.com/science/article/pii/S0012821X24005648
"The #Cryogenian period is believed to have played a significant role in the emergence of complex, multicellular life, with animal and algal-based ecosystems beginning to appear once the ice sheets retreated"
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Cryogenian (Geological periods 🌍)
The Cryogenian is a geologic period that lasted from 720 to 635 million years ago. It is the second of the three periods of the Neoproterozoic era, preceded by the Tonian and followed by the Ediacaran. The Cryogenian was a time of drastic climate changes. After the long environmental stability/stagnation during the Boring Billi...
https://en.wikipedia.org/wiki/Cryogenian
#Cryogenian #IceAges #Glaciology #Neoproterozoic #GeologicalPeriods #GeologyControversies
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I have now done #paleoart for every single period of the Phanerozoic, plus the Ediacaran and Cryogenian! So with that milestone, I thought it'd be fun to go through those periods in order and show off one paleoart of mine for each!
In the Cryogenian, the Earth froze over. Twice! Life wasn't much to look at yet, but I enjoyed drawing what our planet might have looked like at the time. The girdle of lakes at the left is the equator, which may have had ice-free patches.
(1/14)
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A frozen world heaves through the void,its bright surface reflecting the light and heat of the Sun back into space.Is this one of the moons of the gas giants?No, it's our own Earth during the Cryogenian period,640 million years ago. These Snowball Earth events caused the entire planet to freeze over for millions of years. Life held on by the skin of its teeth, whether under the ice or in equatorial lakes.
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Snowball Earth
Through many posts we have talked about the Great Unconformity (yes, you must capitalize it) and how it occurs worldwide in different rock sections. Why? Scientists believe that at several times in Earth’s history the planet was buried in a blanket of ice. Oceans were nearly frozen. This is what scientists call Snowball Earth, or sometimes Slushball Earth.
The last occurred sometime before 650 million years ago, during the aptly named Cryogenian period. In 200 million years, uplift and the giant erosive conveyor belts of ice eroded continents down to the roots of the ancient mountains and left the land at sea level. Think the Canadian Shield. This scraped bare land is the base of the Great Unconformity. As the glaciers melted, sea level rose and covered the land and deposition of sedimentary layers began. Variations of this happened worldwide. We can focus on the North American continent which looked much different at that time. Forget anything west of Idaho or so. It wasn’t there yet.
Wyoming Geologist Myron Cook does a much better job than I could of explaining Snowball Earth, the Great Unconformity, and why different gaps, between hundreds of millions to billions of years of time, exist across what was North America at the time in his great video published only 11 days ago. Throw in a master-class in Deep Time, and you have it all put together as only a master story teller can. And there are lots of rocks, yay! Watch this wonderful video. Yes, it’s long, but you’ll absolutely hate yourself if you don’t get to see the Mineral Fork Tillite and how the story ends. Trust me.
Follow it up with further findings on Snowball earth using thermochronology by Kalin T. McDannell, et. al. including our own @brenhinkeller as they work to help determine if glaciation or the recent hypotheses of tectonic influence had more impact on denudation of the continent. Spoiler alert: read the title of this post again.
https://www.pnas.org/doi/full/10.1073/pnas.2118682119
Another version here: https://eos.org/articles/erasing-a-billion-years-of-geologic-time-across-the-globe
Pinging @BoxcarMurphy who probably knows all about this already :)
#SnowballEarth #SlushballEarth #Glaciation #Cryogenian #TheGreatUnconformity #NorthAmericanContinent #DeepTime #MyronCook #HowSnowballEarthLeveledTheContinentsAndCreatedTheGreatUnconformity #WatchTheDamnVideo #geology #ScienceMastodon @geology