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8 March 2010
When the Sturtian happened
Last Friday, I spent the evening riding up to New York on a bus. To pass the time, I had my iPod and a new paper by Francis Macdonald and colleagues in Science. The paper examines the timing of one of the episodes of “Snowball Earth” glaciation. There’s some important new data in this paper, and it helps constrain the “Sturtian” glaciation in time. So here’s the deal with Precambrian …
Video on carbon sequestration in Oman ophiolite
http://www.whoi.edu/oceanus/viewArticle.do?id=61206 (from one of the Skepchicks)
Suevite from Vrederfort
One of my students brought this sample in the other day: She said her father collected it in South Africa. It was labeled “suevite.” I learned the term suevite about a year ago, while touring the USGS Chesapeake Bay Impact Crater coring project samples at the USGS Headquarters in Reston, Virginia. Wright Horton taught me that suevite is impact-generated melt that chills with other chunks of the pre-impact rock mixed …