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225 BCE
Before the trees were petrified
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60 BCE
After they were petrified
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1418
Native Americans in the park started making trails
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When it was discovered
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It was established as a national monument
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People reported on the national park
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The national monument was open to the public
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It was established as a national park
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The national park extended the amount of land they owned
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People paved the paths that Native Americans made