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Castle Geyser
Castle Geyser is a cone geyser in the Upper Geyser Basin of Yellowstone National Park. It is noted for the particularly large geyserite sinter deposits, which form its cone. These deposits have been likened in appearance to a castle.
When the geyser was given this name in 1870, the top edges of the structure resembled the typical profile associated with the modern concept of a castle, having the appearance of a large keep, multiple turrets, and especially because of the crenellation along the top edges of what resembled its towers. As the drawing below shows the cone had distinctive appearance at the time. Over time the cone's shape changes because of the layers of mineral deposited in successive eruptions.
==History==
On September 18, 1870, the Washburn-Langford-Doane Expedition entered the Upper Geyser Basin. Eventually, members of the expedition named seven geysers they observed in the basin. The appearance of this geyser led Lieutenant Gustavus Cheyney Doane to name it ''Castle Geyser''. Nathaniel P. Langford gave this account in his 1871 Scribner's article:
"The Castle," situated on the summit of an incrusted mound, has a turreted crater through which a large volume of water is expelled at intervals of two or three hours to the height of fifty feet, from a discharging orifice about three feet in diameter. The architectural features of the silicious sinter surrounding it, which is very massive and compact, indicating that at some former period the flow of water must have been much greater than at present, suggested its name. A vent near it is constantly discharging a large stream of boiling water, and when the geyser is in action the water in this vent boils and bubbles with great fierceness.
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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