The Science of Rockfall: What We Know—and What We Don’t
It was a trip of many firsts for Greg Stock. As Yosemite’s park geologist, Stock was doing the first inventory of rock types on El Capitan, with the help of two climbing rangers. The weather was clear and mild that October 2008 day on Mescalito (5.9+ A3). He stopped at the top of each pitch to ...