The subdued light of morning on the yellow mounds area with the rim road passing through it, as seen looking back from Conata Basin Overlook.
In full sun this is the most colorful portion of Badlands geology. Yellow, purple, gray, and striped reddish beds are prominently on display. 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.