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Indian Grinding Rock State Historical Park
Near Volcano in Amador County, California

Indigenous habitation sites in California usually include bedrock mortars, holes in the rock used to grind acorns and other foods. The marble outcrop at this location is by far the largest assemblage of such mortars, with 1,185 of them.

In addition to the mortars the park includes a re-created roundhouse, granaries, bark slab houses, and the Chaw'se Regional Indian Museum. Local Miwok people host events at the park.


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Indian Grinding Rock Park

Indian Grinding Rock Park

Stately oaks and open meadows at Indian Grinding Rock

Indian Grinding Rock State Historical Park, California

Date photographed: June 26, 2012
See location in Google Maps

Bedrock Mortars at Indian Grinding Rock

Bedrock Mortars at Indian Grinding Rock

1185 bedrock mortars in marble bedrock were used to grind acorns into meal

Indian Grinding Rock State Historical Park, California

Date photographed: June 26, 2012
See location in Google Maps

Roundhouse at Indian Grinding Rock

Roundhouse at Indian Grinding Rock

Recreated Native American roundhouse or meeting hall

Indian Grinding Rock State Historical Park, California

Date photographed: June 26, 2012
See location in Google Maps

Roof of the Roundhouse at Grinding Rock

Roof of the Roundhouse at Grinding Rock

Earth-covered roof of the ceremonial roundhouse

Indian Grinding Rock State Historical Park, California

Date photographed: June 26, 2012
See location in Google Maps

Miwok village at Grinding Rock

Miwok village at Grinding Rock

Bark-slab shelters in the recreated Miwok village under the huge oaks at Indian Grinding Rock

Indian Grinding Rock State Historical Park, California

Date photographed: June 26, 2012
See location in Google Maps

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