NO. 915 PETRIFIED FOREST - 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.
4100 Petrified Forest Road West of Calistoga
NO. 915 PETRIFIED FOREST - Marker