These rocks/boulders are found mainly in the Idaho region. They have formed millions of years ago, three to five miles deep between two tectonic plates. Some of these are layers of sand and clay that were folded over and over, pressed together under extreme pressure and immense heat creating what we like to call IDAHO ZEBRA ROCK. These boulders come in a variety of shapes and sizes. These unique and versatile rocks can be used to enhance any landscape. Contact us for more information!