Downstream of Blue Spring, the Little Colorado River glows brilliant turquoise due to suspension of minerals including calcium carbonate, seen on Day 4 of 16 days rafting 226 miles down the Colorado River in Grand Canyon National Park, Arizona, USA. Marble Canyon runs from Lees Ferry at River Mile 0 to the confluence with the Little Colorado River at Mile 62, which marks the beginning of the Grand Canyon. Although John Wesley Powell knew that no marble was found here when he named Marble Canyon, he thought the polished limestone looked like marble. In his words, "The limestone of the canyon is often polished, and makes a beautiful marble. Sometimes the rocks are of many colors – white, gray, pink, and purple, with saffron tints." Multiple overlapping photos were stitched to make this panorama.
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