Chaw''se Indian Grinding Rock State Historic .
Chaw''se is the Miwok word for grinding rock. Upon this rock, they ground the acorns and other seeds into meal, slowly forming the cup shaped depressions in the stone that can still be seen today. Along with the mortar holes, the main grinding rock within the park also features a number of decorative carvings (petroglyphs): circles, spoked wheels, animal and human tracks, wavy lines, etc ...