Safe Mode: On
Volcanic Eruptions And Global Warming Likely Cause Of Great Dying 250 Million Years Ago

The greatest mass extinction in Earth's history also may have been one of the slowest, according to a study that casts further doubt on the extinction-by-meteor theory.

Creeping environmental stress fueled by volcanic eruptions and global warming was the likely cause of the Great Dying 250 million years ago, said USC doctoral student Catherine Powers.

Writing in the November issue of the journal Geology, Powers and her adviser David Bottjer, professor of earth sciences at USC, describe a slow decline in the diversity of some common marine organisms.

The decline began millions of years before the disappearance of 90 percent of Earth's species at the end of the Permian era, Powers shows in her study.

More damaging to the meteor theory, the study finds that organisms in the deep ocean started dying first, followed by those on ocean shelves and reefs, and finally those living nea

-

Added: Oct-26-2007 
By: HAPPYSNAPPER
In:
Other
Tags: Global Warming, Volcanic,
Views: 9027 | Comments: 2 | Votes: 0 | Favorites: 0 | Shared: 1 | Updates: 0 | Times used in channels: 1
You need to be registered in order to add comments! Register HERE