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Re: Atmospheric O2

> From: "Kay A Ferrari" <Kay.A.Ferrari@jpl.nasa.gov>

>  During the conversation, they mentioned that oxygen 
> levels in the Mesozoic atmosphere fluctuated significantly, sometimes getting 
> up as high as 35 percent.  This information, Kevin said, was gathered by 
> analyzing air pockets in amber from different time periods.

I would have thought that amber was a particularly poor source to 
study atmospheric oxygen as even H2O seem to diffuse through the 
structure to a certain extent - most of the insects appear to be 
dessicated..... or am I wrong?