Why were the Black Hills so called?

Black Hills is a literal translation of the name given by the Sioux Indians to the mountainous region in western South Dakota. In the Dakota tongue the name was Paha Sapa, which the early French explorers rendered Carte Noire (“black hills”), and it alluded to the dark and somber aspect of the pine-clad heights as seen from the plains. These heights really deserve to be called mountains. The highest peak, Harney, has an elevation of 7,242 feet above sea level and is higher than any elevation in the Appalachian or Ozark ranges. There are several other peaks in the Black Hills with altitudes of 6000 feet or more.