Site information:

4100 Petrified Forest Rd, 5 mi NW of Calistoga

Site is privately owned and operated. Access to site and plaque is limited to operating hours.  You don't have to pay to get to the plaque, but the parking lot is gated.

38.555766,-122.638720

Plaque information:

State plaque

Plaque text:

Petrified Forest

The petrified forest, dating from the Eocene period, is the only know example of a petrified forest in California. Its size, scope and variety of petrification is unique in the world. Opalized wood, obsidian, quartz crystal, petrified coral and fossilized insects number among its wonders.

Plaque placed by the State Department of Parks and Recreation in cooperation with Ollie Orre Bockee, Jeanette Orre Hawthorne, and Davida Conway, August 19, 1978.

OHP description:

The petrified forest, historically and scientifically significant as the state's only petrified forest dating from the Eocene period, is unique in its size, scope, and variety of petrification. Discovered in 1870, the forest is about a mile long by half a mile wide.

Registered 1/31/1978