July 21-24, 1871 No. 224. AN OBLONG FISSURED RIDGE, of about 150 yards in length, six to ten feet high, and from ten to fifteen broad at the base. The fissure runs from one end to the other, and is from six to twelve inches wide, from which steam issues in considerable quantities. The inner portion
Photograph by Yellowstone National Park
Mammoth Hot Springs
Mammoth Hot Springs is a large complex of hot springs on a hill of travertine in Yellowstone National Park adjacent to Fort Yellowstone and the Mammoth Hot Springs Historic District. It was created over thousands of years as hot water from the spring cooled and deposited calcium carbonate. Because of the huge amount of geothermal vents, travertine flourishes. Although these springs lie outside the caldera boundary, their energy has been attributed to the same magmatic system that fuels other Yellowstone geothermal areas.
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