has two main vents, below large, deep pools, and several smaller satellite vents. As its name (given in 1878) suggests, eruptions are irregular, lasting from 10 minutes to several hours, separated by quiet periods of between 1 and 3 hours, and sending water up to 15 feet in the air, from both the main vents. The pools are surrounded by extensive formations of white and grey, coral-like sinter. The geyser is connected to nearby Penta
geysers; all lie at the east edge of the basin, bordered by the pine forest.
Back to map of the Upper Geyser Basin