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CONE VS FOUNTAIN GEYSERS

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The plumbing system of a cone-type geyser usually has a narrow constriction close to the geyser’s vent. During eruptions, the constriction acts like a nozzle, causing the water to jet in great columns. The cone is formed by the constant deposition of silica around the geyser’s vent.

Many of Yellowstone's most famous geysers, including Old Faithful, are cone-type geysers.

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