Inky black shards of volcanic glass unearthed in Alberta are helping researchers trace the movements of Indigenous people ...
At the National Historic Landmark of Obsidian Cliff, the molten lava that ... United States to sign a new law making ...
Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park ... in Yellowstone. In samples gathered at Obsidian ...
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