Petrified Forest National Park in northern Arizona is famous for enormous crystalized trees and dinosaur bones dating back to the Triassic period. The park's hills are also full of tiny bones.

Petrified Forest, declared a national monument in 1906 and a national park in 1962, covers more than 220,000 acres in northeastern Arizona and contains exposures of a unit of rock called the ...

Petrified Forest National Park in northern Arizona is famous for enormous crystalized trees and dinosaur bones dating back to the Triassic period. The park's hills are also full of tiny bones.