Kayaks at Pictured Rocks National Lakeshore, Munising, Michigan                                         (Larger)
by Don Olson Photography on Flickr

“…Streaks on the face of the cliffs come from the groundwater leaching out of the rock. With it come iron (red), manganese (black-white), limonite (yellow-brown), copper (pink-green) and other minerals. As the water evaporates, these minerals leave streaks of color…” [Wikipedia]

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