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Chawse Indian Grinding Rock Associaton WELCOME TO THE CHAWSEINDIAN GRINDING ROCK ASSOCIATION TheChawse Indian Grinding Rock Associationis a notforprofit allvolunteer organization supporting Indian Grinding Rock State Historic Park one of the most important Native American historic sites in California. Indian Grinding Rock State Historic Park located in Northern Californias Sierra Nevada foothills is known for its unique chawse grinding rock decorated with petroglyphs. The park also features a ceremonial roundhouse a reconstructed village picnic grounds trails and camping facilities. The onsiteChawse Regional Indian Museumfeatures technology and crafts of the Miwok and other Sierra Nevada Native American groups.