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Re: "Oxygen Helped Mammals Grow, Study Finds"


That may be applicable today, when we know the balance points between O2 and C13, but could there have been different ratios, influenced by other components of the atmosphere? [e.g. A lower nitrogen percentage, which would allow a larger free O2 % without affecting the C13 % - This scenario would allow for higher O2 and more C13 in the ocean - perhaps due to the tremendous amount of vegetation that may have existed (which would tie-up more N2 and release more C)].


Allan Edels

From: David Marjanovic <david.marjanovic@gmx.at>
Reply-To: david.marjanovic@gmx.at
To: DML <dinosaur@usc.edu>
Subject: Re: "Oxygen Helped Mammals Grow, Study Finds"
Date: Thu, 29 Sep 2005 21:26:33 +0200

I'd need to see the details of how amount of C13 in OCEAN deposits
correlates to O2 levels in the atmosphere.

The more carbon is washed into the oceans and thus escapes oxidation, the more oxygen stays in the air.

http://www.nature.com/news/2005/050926/full/050926-13.html for those with access to Nature News.