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originally posted by: ArMaP
a reply to: audubon
It also says:
That some organisms survived—and even branched off into new species—during the Sturtian glaciation adds credence to the idea that snowball Earth harbored open-water refuges, or at least cracks in the ice, Macdonald said.
The carbon isotopes in the Neoproterozoic rocks of Namibia record a different situation. Just before the glacial deposits, the amount of carbon 13 plummets to levels equivalent to the volcanic source, a drop we think records decreasing biological productivity as ice encrusted the oceans at high latitudes and the earth teetered on the edge of a runaway freeze.
Once the oceans iced over completely, productivity would have essentially ceased, but no carbon record of this time interval exists because calcium carbonate could not have formed in an ice-covered ocean. This drop in carbon 13 persists through the cap carbonates atop the glacial deposits and then gradually rebounds to higher levels of carbon 13 several hundred meters above, presumably recording the recovery of life at the end of the hothouse period. Abrupt variation in this carbon isotope record shows up in carbonate rocks that represent other times of mass extinction, but none are as large or as long-lived. Even the meteorite impact that killed off the dinosaurs 65 million years ago did not bring about such a prolonged collapse in biological activity.
MARS still receives periodic impact's from the asteroid belt
originally posted by: audubon
If you're thinking that I was implying that life was destroyed and didn't do anything until the snowball Earth period ended, as though coming out of hibernation, that's a mistaken observation:
originally posted by: ArMaP
originally posted by: audubon
If you're thinking that I was implying that life was destroyed and didn't do anything until the snowball Earth period ended, as though coming out of hibernation, that's a mistaken observation:
I was, I forgot that you had said "except some very simple extremophile creatures clustered around a very limited number of deep-ocean volcanic vents".
originally posted by: stonerwilliam
Interesting picture of a Snake in that photo and it looks alive
www.chron.com...
originally posted by: FlyInTheOintment
a reply to: LABTECH767
MARS still receives periodic impact's from the asteroid belt
Speaking of periodic impacts - do you realise that your sentences are grotesquely long, grammatically improper & really annoying to read? You're supposed to punctuate your thoughts with impactful periods, commas & the like...
With that said, once I get past the absurd sentence structure, I agree with many of your points. The reason I highlight your grammatical treason, is that it really distracts the reader from paying close attention to what you're actually trying to say. Maybe have a go at reducing the length of your sentences? I suppose you may be stuck in a comfortable rut, but by breaking out of that you will have a much easier time of conveying your thoughts to others in a way that doesn't cause annoyance/distraction, or which may indeed be affecting their perception of your intellect..