Castle Geyser's

Cone

This is a view of the Castle Geyser's cone. Sinter, the material the cone is made from, deposits very slowly in the Upper Geyser Basin. Because of this, the cone is estimated to be over 5,000 years old. The sinter formation on which the cone sits was deposited by a hot spring that preceded the geyser. This underlying sinter formation has been estimated to be as much as 200,000 years old.

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