| Fan and Mortar Geysers | |
|---|---|
 Mortar on the left and Fan on the right | |
 | |
| Name origin | Fan - Washburn Party (1870) Mortar - Frank Jay Haynes (1883) |
| Coordinates | 44°28′28″N 110°50′33″W / 44.47444°N 110.84250°W |
| Elevation | 7,300 feet (2,200 m)[1] |
| Type | Cone geyser |
| Eruption height | Fan-125 feet, Mortar 80 feet |
| Frequency | 3 days-weeks |
| Duration | 30 min |
| Temperature | 48.2 °C (118.8 °F)[2] |
Fan and Mortar Geysers are two geysers in the Upper Geyser Basin in Yellowstone National Park. For the past several decades, they have erupted in concert with one another and are generally talked about together. The records detailing these geysers' known eruptive history shows that they have been infrequent and irregular performers.
- ^ U.S. Geological Survey Geographic Names Information System: Fan Geyser
- ^ "Fan Geyser". Yellowstone Geothermal Features Database. Montana State University. 1999-06-19. Retrieved 2009-12-19.