An Unexpected Discovery in Yellowstone Is Leaving Experts Without Answers

Inside Yellowstone National Park, researchers uncovered evidence of a prehistoric network far older and more complex than many people expected.
At Obsidian Cliff, archaeologists discovered that ancient peoples were quarrying volcanic glass thousands of years ago.
The discovery was remarkable.
This obsidian was not just used locally.
It traveled across vast distances.
It appeared in archaeological sites far beyond Yellowstone.
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