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1540
Prehistoric Peoples live in the park (13,500 BCE-1540 CE)
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Captain Lorenzo Sitgreaves first documents petrified wood in Petrified Forest National Park
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President Theodore Roosevelt creates the Petrified Forest National Monument
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President Woodrow Wilson signs the National Park Service Act
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Over 53,000 acres are added to Petrified Forest National Park
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Petrified Forest National Park is officially established and completed
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Paleontologists discover 50 new fossil sites and at least a dozen dinosaur skeletons
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George W. Bush signs a bill that allows Petrified Forest National Park to expand by more than 2x the size.
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Painted Desert Community Complex Historic District listed on the National Register of Historic Places.
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Petrified Forest National Park celebrates 100 years of protection