Indian Grinding Rock State Historic Park
14881 Pine Grove Volcano Rd, Pine Grove, CA 95665, USA
Indian Grinding Rock State Historic Park is a California State Park, preserving an outcropping of marbleized limestone with some 1,185 mortar holes This is the largest collection of bedrock mortars in North America. The park is nestled in a little valley. This museum within the park grounds features a variety of exhibits and a vast collection of Sierra Nevada Indian artifacts.
Location of Indian Grinding Rock State Historic Park