Petrified Forest National Park is located in Arizona along Interstate 40 between Holbrook and Navajo. It features one of the world's largest and most colorful concentrations of petrified wood, mostly of the Araucarioxylon arizonicum species. The park consists of two large areas connected by a north–south corridor. The northern area encompasses part of the multihued badlands of the Upper Triassic Chinle Formation called the Painted Desert. The southern area includes colorful terrain and several concentrations of petrified wood. Several American Indian petroglyph sites are also found in the southern area.