How an overflowing spring begins to build a terrace of "geyserite" deposits, Yellowstone Park, U.S.A.
You are up on one of the terraces of the Mammoth Springs, an irregular shaped hill, three hundred feet high, above the plateau by the hotel and the barracks of Fort Yellowstone. All the "rock" on which you stand here has been built up by slow deposits from the overflowing waters of the boiling hot springs. you can see here for yourself what the process is; these waters, boiling over the rim of their kettle, are trickling down over the outside, and, as they evaporate, they leave this crusty deposit behind, like salt or sugar on a cook's utensils. Ages and ages on ages this sort of thing has been ...
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