Volcanism triggered end-Triassic extinction

The end-Triassic mass extinction exterminated up to three-quarters of all species on land and in the oceans 201 million years ago. This die-off opened up ecological niches and allowed for, among other changes, dinosaurs to diversify and spread across terrestrial ecosystems during the rest of the Mesozoic. Volcanism has long been implicated in the extinction, but whether it had a major impact on the planet at the time has remained unclear. In new research, scientists observed elevated mercury concentrations in extinction-aged rocks from around the world. Because volcanism is the main nonanthropogenic source of mercury in the environment, the findings suggest that volcanic activity was likely the main extinction trigger at the end of the Triassic.

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Lucas Joel

Lucas Joel was EARTH's 2015 summer intern.

Joel was EARTH’s 2015 summer science writing intern and is now a freelance science writer. He has a master's in paleontology from the University of California, Riverside. Based out of Ann Arbor, Mich., he ventures often to the sandstone cliffs of Kentucky’s Red River Gorge and dreams of hiking up Mont Blanc in the French Alps. 

Thursday, September 21, 2017 - 06:00

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