history of the salt flats
History of the Bonneville Salt Flats, Utah. Taken from the Utah History Encyclopedia (Links Added). -1-. The Bonneville Salt Flats of the western Great Salt Lake Desert were formed through the evaporation of the Pleistocene-era Lake Bonneville. The salt flats are actually the bed of that once massive lake which rivaled in size present Lake Michigan. The flats are composed mainly of potash salts ranging in thickness from less than one inch to six feet.