The Painted Desert at Petrified Forest National Park features badlands striped in lavender, gray, rust and cream colors, due to stratified layers of siltstone, shale, sandstone and mudstone sculpted by millions of years of erosion. Petrified Forest National Park TOP TO BOTTOM: ADOBE STOCK/FUEGE01; KERRICK JAMES Spring-fed waters rich in minerals such as calcium carbon-ate lend a turquoise hue to the Little Colorado River , one of the largest tributaries of the Grand Canyon. Little Colorado River 7