Sulphur Works and Little Hot Springs Valley Photos

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As in many hydrothermally active areas, the rocks at Sulphur Works and Little Hot Springs Valley in Lassen Volcanic National Park have been chemically altered into bright-colored clays. Sulfurous acid and sulfuric acid have broken down hard, gray-green andesite lavas into red, yellow and buff clays and iron oxides.
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Sulphur Works

Boiling Mudpot, Little Hot Springs Valley