The Petrified Forest dating from the eocene period, is the only known 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.

California Registered Historical Landmark No. 915

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.