Figure 15.29

Rockfall in Yosemite Valley. (A) This map shows the locations of rockfall events in Yosemite Valley over 150 years. The season is coded by color, and the amount of material that fell is indicated by the size of the colored circle. (B) This photo captured a major rockfall event as it occurred on October 11, 2010. (C) Large angular boulders dot Yosemite Valley’s floor. Many of these boulders, which originated from prehistoric rockfall events, traveled far into the valley before they came to rest.

(A. Greg Stock, Yosemite National Park, National Park Service; B. © Tom Evans, www.elcapreport.com; C. Steven M. Bumgardner, Yosemite National Park, National Park Service)