This Month in Photo of the Day: National Geographic Magazine Features

Boulders perch randomly at Olmsted Point in Yosemite National Park. A glacier sculpted the 92-million-year-old bedrock here and left the boulders, plucked from a nearby mountain, when it retreated. The rocks, along with grooves in the bedrock, show the path of the glacier.

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

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