Sport your favorite National Park in style with great souvenir shirts, hats, mugs, stickers and gifts from SnapTees. Petrified Forest NP Established in 1962 in Arizona with a concentration of 225-million-year-old petrified wood. The nearby Painted Desert, has eroded red-hued volcanic rock called bentonite. There are also dinosaur fossils and Native American sites. Great gifts for the whole family!