fossil firmament flip flopped frequently?http://www.msnbc.msn...cience-science/
Fossil Atmosphere Flip Flopped
Started by
Scylla
, Mar 20 2012 08:06 PM
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#2
Auspex
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Posted 20 March 2012 - 08:27 PM
Huh...I wonder if they have any guesses as to the duration of the cycles?
It seems to me that their margin of 100 million years between the deposition of the rocks they sampled, and the stabilization of the atmosphere by cyanobacteria, is a terribly small increment of time compared to the 2.5-2.65 billion year age of the rocks...the individual cycle layers must span periods close to their capability to measure them!
It seems to me that their margin of 100 million years between the deposition of the rocks they sampled, and the stabilization of the atmosphere by cyanobacteria, is a terribly small increment of time compared to the 2.5-2.65 billion year age of the rocks...the individual cycle layers must span periods close to their capability to measure them!
"There has been an alarming increase in the number of things I know nothing about."
-Ashleigh Ellwood Brilliant
#3
Scylla
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Posted 20 March 2012 - 08:33 PM
Nat geo version says "every few million years"
http://newswatch.nat...aze-on-and-off/
http://newswatch.nat...aze-on-and-off/
Edited by Scylla, 20 March 2012 - 08:34 PM.
#4
xonenine
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Posted 20 March 2012 - 08:42 PM
maybe ocean overturn events drove the cycle...
"Your serpent of Egypt is bred now of your mud by the operation of your sun; so is your crocodile." Lepidus
#5
Auspex
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Posted 20 March 2012 - 09:20 PM
Maybe an unmoderated, unbuffered oscillation between methane producers and methane consumers? Solar light levels reaching the surface could have tipped the scales each way in turn.
"There has been an alarming increase in the number of things I know nothing about."
-Ashleigh Ellwood Brilliant
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