Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast ...
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 ...
From bison burgers to huckleberry margaritas, get ready to discover the must-try dishes and best places to eat in Yellowstone ...