Quote:
Originally Posted by cran
The mention of 35% O2, and giant insects, rang a bell - is there some confusion here between the Cretaceous ...
and the Carboniferous?
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The story of high oxygen in the Cretaceous dates back to the 80s, with the work on amber bubbles which was subsequently discredited. It then revived with
Bergman's COPSE model. But
Berner's more recent GEOCARBSULF model (770kB pdf) suggests low levels of oxygen in the Cretaceous: down to the equivalent of 12% of our current atmospheric pressure, then rising to 18% towards the end.
Grant Hutchison