Sip back and explore Arizona’s deserts, canyons, and plateaus preserve one of the most diverse fossil records in the United States. From Paleozoic trilobites in Grand Canyon limestones to Triassic petrified wood at Petrified Forest National Park, the state reveals ancient seas, forests, dinosaurs, and mammals. Visitors explore iconic landscapes shaped by tectonics, volcanism, and erosion that together tell Arizona’s deep geological history for visitors today.