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A volcanic hot spot beneath the site forced geysers of steam up through cracks and fissures, similar to those in Yellowstone.
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When the hot spoot cooled or moved, the fissures filled with hard minerals. Then, over countless eons, the soft sandstone around them eroded away. We are left with modern works of Nature's patient art--a grand gift to the lowly photographer!
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Look at the size of Chimney Rock! (above). Even the Grand Parade (below) has its own decorative spire.
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Can you tell I'm enjoying myself going though thousands of images?...