Study: Mountains reached current elevation earlier than thought

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The Ruby Mountains in northeast Nevada are within the Basin and Range region where Andreas Mulch and his colleagues analyzed samples of volcanic glass. Credit: Andreas Mulch
The Ruby Mountains, in northeast Nevada, are within the Basin and Range region where Andreas Mulch and his colleagues analyzed samples of volcanic glass. Credit: Andreas Mulch

Geologists studying deposits of volcanic glass in the western United States have found that the central Sierra Nevada largely attained its present elevation 12 million years ago, roughly 8 or 9 million years earlier than commonly thought.


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