How old is Yosemite Valley?

ENN
Oct 24, 2022, 4:25 pm231 pts
First-time visitors to Yosemite Valley gape in awe at the sheer granite wall of El Capitan and the neatly sliced face of Half Dome, aware, perhaps vaguely, that rain and glaciers must have taken a long time to cut and sculpt that landscape. But how long?

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