Mainly because flying animals did REALLY well in the thicker, more-viscuous, CO2-enriched air of the Cretaceous. Despite lower O2 levels, the greater average air temperature did wonders for the propogation of wildfires, which was selectively more detrimental to terrestrial animals.
Figure mean daily summer temperatures in Massachusetts on the order of 35 to 40 C, perhaps a bit less along the coast.
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Date: 2017-04-12 08:39 pm (UTC)Figure mean daily summer temperatures in Massachusetts on the order of 35 to 40 C, perhaps a bit less along the coast.