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Before Dinosaurs' Era, Volcanic Eruptions Triggered Mass Extinction

Posted Mar 21 2013 2:00pm

Road passing through snow covered ancient rocks in Hartford Basin, Conn.

More than 200 million years ago, a massive extinction decimated 76 percent of marine and terrestrial species, marking the end of the Triassic period and the onset of the Jurassic.

The event cleared the way for dinosaurs to dominate Earth for the next 135 million years, taking over ecological niches formerly occupied by other marine and terrestrial species.

It's not clear what caused the end-Triassic extinction, although most scientists agree on a likely ...

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This is an NSF News item.

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