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Park nearby Pine Grove
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Indian Grinding Rock State Historic Park
3.8
14881 Pine Grove Volcano Rd, Pine Grove, CA 95665, United States, GPS: 38.42407,-120.64265
The park was created in 1968 and preserves a great outcropping of marbleized limestone with some 1,185 mortar holes -- the largest collection of bedrock mortars in North America.
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