Ancient Volcanic Ash Deposits Help Clarify Mass Extinction Event (IMAGE)

University of Texas at Dallas

Ancient Volcanic Ash Deposits Help Clarify Mass Extinction Event

Caption

Dr. John Geissman, professor and head of the Department of Geosciences at UT Dallas, examines a fossilized volcanic ash deposit in the Karoo Basin South Africa. He is part of an international research team studying geological evidence related to the largest mass extinction on Earth 250 million years ago.

Credit

Photo courtesy Robert Gastaldo, Colby College

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