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- Title: Devil's Tower Geology
- Description: The igneous material that forms the Tower is a phonolite porphyry intruded about 40.5 million years ago, a light to dark-gray or greenish-gray igneous rock with conspicuous crystals of white feldspar. As the magma cooled, hexagonal columns formed that are now hundreds of feet long.
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- Added: Feb 18, 2018
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