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Powell did not discover the Grand Canyon, but he led the first known passage through the Canyon in 1869. It was first seen by Europeans in 1540 but had been known by the Native Americans for centuries.
John Wesley Powell, named the Grand Canyon.
He was the first white man discover the Grand Canyon. He wrote in a diary about his adventure and discovered some new species.
John Wesley Powell
John Wesley Powell adventured through the Grand Canyon on the Colorado River on May 24, 1869.
John Wesley Powell, named the Grand Canyon.
John Wesley Powell.
John Wesley Powell
John Wesley Powell
i don't know if this is the answer your looking for but John Powell explored the grand canyon at one point.
Scientific curiosity.
he found the grand canyon