April 3, 2012

Rubbing Stone, Washington

Photograph by Fritz Hoffmann, National Geographic

This Month in Photo of the Day: Nature and Weather Photos

Looking as if it fell from the sky, a 40-ton erratic stands on the Colville Indian Reservation in Washington State. Such boulders are sometimes called rubbing stones because bison scratched up against them.

See more pictures from the March 2012 feature story "Rock … And Roll."

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