Indian Grinding Rocks State Historic Park
14881 Pine Grove-Volcano Rd.
Pine Grove, CA 95665
State Park: Birding, Camp, Hike, History, Picnic, RV, Walk
The park nestles in a little valley 2,400 feet above sea level with open meadows and large valley oaks that once provided the native Americans of this area with an ample supply of acorns. The 135-acre 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