Federal Writers' Project of the Works Progress Administration for the State of North Dakota, North Dakota: A Guide to the Northern Prairie State
“ The chief agent, however, in the formation of the Badlands has been the Little Missouri River, which centuries ago began to carve its way down through the soft shales and sandstones with which the early seas had covered the area. Aided by the eroding action of wind, frost, and rain, by huge landslides, and by burning coal veins, the once swift, always silt-laden river and its tributaries have floated away all the age-old clays of the region except these buttes and domes piled in indescribable confusion along the valley floor. ”
