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Grotto Spring

Yellowstone National Park

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ADDED: Jul 13, 2005 19:08

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Grotto Spring is also a small geyser with an erratic eruption interval ranging from one hour to two days. Between eruptions there is a constant gurgling sound of steam boiling from the spring.

The unusual sinter deposits around the geyser are about 8 feet high. They are forming from the splashing of water during eruptions that, in turn, evaporates, leaving behind the mineral deposits.