Blue Star Spring is an irregularly-shaped hot spring in the Old Faithful Group of the Upper Geyser Basin in Yellowtone, Wyoming, USA. Its dimensions are about 3.5 by 4.5 meters. A thin projecting ledge of geyserite / siliceous sinter borders the pool. Part of this ledge was broken when a buffalo once stepped on it - buffalo bones are present at the bottom of the spring. Overflow drains from the southeastern corner of the spring and heads ~northeast toward the Firehole River. Blue Star Spring eruptions are rare. Bubbling, vent flaming, and occasional heavy overflow events are known.
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