Indian Grinding Rock State Historic Park Wikipedia
Indian Grinding Rock State Historic Park is a California State Park, preserving an outcropping of marbleized limestone with some 1,185 mortar holesthe largest collection of bedrock mortars in North is located in the Sierra Nevada foothills, 8 miles (13 km) east of park is nestled in a little valley 2,400 feet (732 m) above sea level, with open meadows and large