The Petrified Forest outside of Calistoga, CA displays the largest petrified trees in the world. These forests of redwood and pine trees once covered the hills of this area. A violent eruption from Mt. St. Helena, (not Mt. St. Helens – that’s in Oregon) covered these trees in a blanket of volcanic ash. For several million years, water saturated the ground dissolving silica from the ash. The silica eventually replaced the molecules of the wood, turning wood to solid silica, quartz, and stone.
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