SNAIL STORIES Need proof that the Bay Area was once under water? Have a look at marine turritellas preserved in rocks on Mount Diablo.

It's episode 14 of 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.