In 1925, a hydrothermal explosion reshaped Yellowstone’s Biscuit Basin; 101 years later, USGS reconstructed from 1926 letters how a misplaced ‘Black Pearl’ sign shifted the story 1,000 feet from the real geyser

A captivating century-old enigma surrounds Yellowstone’s Biscuit Basin, centering on the misplacement of Black Pearl Geyser. The confusion stemmed from a hydrothermal explosion in 1925, which not only reshaped the landscape but also displaced a key sign. Correspondence from 1926 highlighted the depth of this perplexity related to the geyser’s position.
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