Save Mount Diablo: Rocks on the Move

Rock City Parking Lot S. Gate Road, Danville, CA, United States

Explore 180 million Years of Geologic History on Mount Diablo What do the summit of Mount Diablo and the Marin Headlands have in common? How is Sentinel Rock in Rock City related to Yosemite’s Half Dome? You’ll discover the answers … Read more


Lake Temescal Walking Waterhoods Tour

Lake Temescal 6500 Broadway Avenue, Oakland, CA

Join us for a one-mile natural and cultural history walking tour of Lake Temescal on Saturday, Feb 17th from 11:00 am to 12:30 pm. Please register here. We are requesting a $10 donation, but no one will be turned away … Read more