SENTINEL ROCK is Mount Diablo's answer to Half Dome in Yosemite. You may laugh, but geologically it is not as silly as it sounds.

Take a virtual walk on the TRAIL THROUGH TIME, a series of geology videos featuring naturalist Ken Lavin. Sponsored by the Mount Diablo Interpretive Association in partnership with Save Mount Diablo. Videography by Macha Rose. Animations by Tanya Atwater, UC Santa Barbara. Music by Phil Heywood. Produced by Joan Hamilton.