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.
Registration Date: 1/31/1978
4100 Petrified Forest Rd, 5 mi NW of Calistoga
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