John Marshall on the Riddle of the Mass Extinction 360 Million Years Ago

The Earth has endured many mass extinctions.  We are pretty confident that we know what caused these events.  Except for one of them: the one at the end of the Devonian period 360 million years ago.  John Marshall is a fossil expert specializing in mass extinction events and is a Professor at the School of Ocean & Earth Science at the University of Southampton.  He explains how his recent research has uncovered new evidence that may finally explain what caused the end-Devonian mass extinction.

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