There are few places where the span of geologic and human history is as wide or apparent as it is at Petrified Forest National Park. Fossilized trees and countless other fossils date back to the Triassic Period, while a stretch of the famed Route 66 of more modern lore is protected within park boundaries. Ancestors of the Hopi, Zuni, and Navajo left petroglyphs, pottery, and even structures built of petrified wood. Nine park sites are on the National Register of Historic Places; the Painted Desert Inn is one of only 3% of such sites that are further listed as National Historic Landmarks.
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