Yosemite NP's formations millions of years younger than previously thought, scientists claim

Yosemite National Park's famous valley might not be as old as previously thought.

If the geologists from the University of California, Berkeley, and the park are right, the Yosemite Valley is only about 5-10 million years old, not 50 million as long thought. The three -- Kurt Cuffey and David Shuster from the university and Greg Stock from Yosemite -- say the erosional forces that carved the valley came to bear no more than 10 million years ago, and probably only in the past 5 million years.

https://www.nationalparkstraveler.org/2022/11/geologists-give-new-age-yosemite-valley