Excelsior Geyser,
Yellowstone Park
Excelsior Geyser, located in Yellowstone's Midway Geyser Basin, is considered the largest geyser in the world, though now effectively dormant. During its last major eruptions in the 1880s, Excelsior frequently reached a height of 300 feet, creating the dramatic display shown in this early Haynes divided-back postcard. It is believed that the violent eruptions of that period may have caused damage to the sinter lining, allowing gas leakage, and resulting in reduced thermal energy. The only observed eruption since that early time was in 1985 when Excelsior erupted for two days, reaching a height of between 20 and 80 feet. As a hot spring, it discharges more than 4050 gallons of water per minute. Its large deep crater and brilliant blue appearance allow it to remain one of Yellowstone's popular thermal attractions.  (Source: Carl Schreier, A Field Guide to Yellowstone's Geysers, Hot Springs and Fumaroles)
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