Sierra Nevada Range Was Born Twice – Study Reveals
New research reveals that after its initial formation 100 million years ago, the Sierra Nevada “died” during volcanic eruptions that blasted lava across much of the American West 40 million to 20 million years ago. Then, tens of millions of years later, the Sierra Nevada mountain range as we know it today was “reborn.”
When geologist Elizabeth Miller started mapping a fault system in Death Valley, she questioned the origin of some sedimentary rocks previously assumed to be locally derived. Now, analysis has revealed where they really came from: central Nevada, indicating that part of today’s Great Basin was the highest land in North America some 40 million to 20 million years ago.
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