• Rainbow over Half Dome

    Yosemite

    National Park California

Yosemite Nature Notes 10: Rock Fall

Rockfall from Royal Arches

Rock Fall
July 7, 2010

Since the glaciers retreated around 15,000 years ago, rock fall has been the major force of change in Yosemite Valley. Geologists work to understand this force of nature in order to protect the millions of visitors who come here each year.

 
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Did You Know?

Rockfall area and talus slope at base of Three Brothers in Yosemite Valley.

In March 1987, the largest historical rockfall in Yosemite National Park deposited an estimated 1.5 million tons of debris at the base of Three Brothers, closing Northside Drive for several months.