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Powell first saw the Great Unconformity in 1869, video of his USGS Exploration

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Powell first saw the Great Unconformity in 1869, video of his USGS Exploration

↗https://www.dailymail.com/video/sciencetech/video-2485595/Video-Powell-saw-Great-Unconformity-exploration.html

John Wesley Powell Great Unconformity 1869 USGS Lake Powell Grand Canyon

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