Petrified Forest National Park is in northeastern Arizona, consisting of semi-desert shrub steppe and colorful badlands. The northern part known as the Painted Desert was declared a national monument in 1906 and a national park in 1962. The Petrified Forest is known for its large deposits of fallen trees that lived in the Late Triassic, about 225 million years ago. The sediments containing the fossil logs are part of the widespread and colorful Chinle Formation, from which the Painted Desert gets its name.
