Obsidian Cliff Yellowstone National Park

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Historical landmark in Tower Junction, United States
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Obsidian Cliff is the primary source of obsidian in a large concentration of Midwestern archeological sites.

Frequently asked questions

Q:
Did other national parks exist before Yellowstone?
A:
Some sources list Hot Springs in Arkansas as the first national park. Set aside in 1832, forty years before Yellowstone was established in 1872, it was actually the...
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