Yellow Mounds
South Dakota
This is the most colorful portion of Badlands geology. Yellow, purple, gray, and striped reddish beds display the sequence of the most colorful portion of Badlands geology—the Interior Paleosol, Chadron, and Brule formations respectively, from bottom to top. Paleosols are ancient fossilized soils preserved in the rock record, and they often appear as brightly colored layers like the Yellow Mounds, which gets its mustardy color from a mineral called Goethite. Photo © copyright by Robert Faucher.
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