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Mesozoic Oxygen



S.S. Lazarus wrote:

"Is there anyway to infer oxygen levels during the Mesozoic from the fossil
record?"

The study in question, Hengst et. al. (1996), notes a number of ways that
indirect evidence for varying Mesozoic oxygen levels have been detected,
including analysis of the thickness of dinosaur eggshell (Erben et. al 1979)
and analysis of gases trapped in amber air bubbles (Landis et. al. 1993). The
paper also cites Cerling's study of root paleosols that found C02 levels two
to tens times greater than that in the present atmosphere.

Caitlin R. Kiernan