See Ear Spring, Upper Geyser Basin, Yellowstone National Park, Wyoming

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Ear Spring is a truly hot spring, with surface water temperatures often above the boiling point of 198°F (92°C) at this elevation. True to its name, this pool is shaped somewhat like an ear. Very rarely, Ear Spring erupts. The last eruption happened on September 15, 2018 (14 years since the last known eruption). This eruption proved to be historic, for it actually ejected old coins, cans, a cement block, and even a baby pacifier along with the usual water and steam. This is a good reminder to never toss anything into thermal features, as they can damage the features, sometimes to the point of plugging the vents completely. Thankfully, it appears that the major of objects ejected from Ear Spring were historic rather than contemporary objects. Ear Spring has an average temperate of 197.1°F (91.7°C), an average pH of 8.4, and an average conductivity of 1889 uS/cm.

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