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Hoffman to discuss 'Snowball Earth,' March 26

lecture on "Snowball Earth: Surprise in Deep Time" will be delivered at 8 p.m. Wednesday, March 26, in Reynolds Auditorium, McDonnell Hall.

Paul Hoffman, the Sturgis Hooper Professor of Geology at Harvard University, will present the talk, which is part of this year's Evnin Lecture Series on "Fire, Water and Ice: Catastrophes in Earth History."

"Snowball Earth" refers to a situation in which sea ice extends all the way from the poles to the equator. "Many lines of evidence support a theory that the entire Earth was ice-covered for long periods 600 to 700 million years ago," Hoffman wrote in a paper with Daniel Schrag. "Each glacial period lasted for millions of years and ended violently under extreme greenhouse conditions. These climate shocks triggered the evolution of multicellular animal life, and challenge long-held assumptions regarding the limits of global change."

The lecture is sponsored by the Council on Science and Technology .

Contact: Ruth Stevens (609) 258-3601

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