geological record Archives - TPR: The Public's Radio

Hells Canyon, the deepest river gorge in the United States, was carved just about 2.1 million years ago — making it much younger than the Grand Canyon.

NPR

Hells Canyon, the deepest gorge in the U.S., is surprisingly young

by Nell Greenfieldboyce May 27, 2025May 27, 2025

Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

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