BUILDING THE TRAIL In this tour, we've visited every stop on Mount Diablo's Trail Through Time. Here, finally, is the story of how the trail was built.

The TRAIL THROUGH TIME is 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.