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Researchers find origin of 'breathable' atmosphere half a billion years ago
Date:10/29/2007

d sulfur isotope data -- oxygen levels dramatically rose during that time.

What can this event tell us about climate change today" Oxygen levels have been stable for the last 50 million years, but they have fluctuated over the last 500 million, Saltzman said. We showed that the oxygen burst in the late Cambrian happened over only two million years, so that is an indication of the sensitivity of the carbon cycle and how fast things can change.

Global cooling may have boosted life early in the Ordovician period, but around 450 million years ago, more tectonic activity -- most likely, the rise of the Appalachian Mountains -- brought on a deadly ice age. So while most of the world's plant and animal species were born during the Ordovician period, by the end of it, more than half of them had gone extinct.


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Contact: Matthew Saltzman
Saltzman.11@osu.edu
614-292-0481
Ohio State University
Source:Eurekalert

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