Yellowstone Sepia Snow | In Search of… At Yellowstone, the rain and melted snow seeps into the earth. The cold water gets warmed by heat from molten magma deep underground. The hot water with dissolved limestone rises up through small fissures. Once above ground, the dissolved limestone solidifies into a white, chalky mineral called travertine. Travertine forms the terraces at Mammoth Springs as well as other formations like this one, found nearby. For the whole story with all images, see Yellowstone Sepia Snow | a 7 Image Story.
