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Fan and Mortar Geysers
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.
== History ==
Fan and Mortar's effect on the surrounding area, plus the size of their respective cones reveal that they were very active in the past. However, up until 1925, they were essentially two geysers that were very close to each other as their eruptive patterns were independent of each other and were nowhere near the power of the eruptions of today. Some time preceding 1925, the two must have been eventually become connected at some depth and they have since performed as one very large geyser. Fan Geyser was named by the Washburn–Langford–Doane Expedition of 1870. Mortar Geyser was named by Frank Jay Haynes in 1883 because eruptions resembled mortar discharges.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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