News of the WeekPaleoclimatology

Cosmic Dust Supports a Snowball Earth

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Science  08 Apr 2005:
Vol. 308, Issue 5719, pp. 181
DOI: 10.1126/science.308.5719.181

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Summary

On page 239 of this issue, a group of geochemists say they found so much iridium--which continually rains down on Earth from space--deposited at the end of a glaciation 635 million years ago that the planet must have been frozen pretty much solid for 12 million years straight.