There is an area inside Badlands National Park that highlights something called the "Yellow Mounds" so called as they display a distinct yellow color resulting from the sediments of an ancient sea that stretched from Canada to the Gulf of Mexico, splitting the continent in half. In the dry, mostly sandstone coloring of the Badlands, the Yellow Mounds bring some nice color to the area. The yellow comes from when this area was a large inland sea. The red, which is higher up, is from when the area was a wet forest. The colors tell the story.
