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zzi) Basement Rocks, Laying The Foundation - Grand Canyons Story Began 1,840 Million (Nearly 2 Billion) Years Ago ....JPG
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%20Basement%20Rocks%2C%20Laying%20The%20Foundation%20-%20Grand%20Canyons%20Story%20Began%201%2C840%20Million%20(Nearly%202%20Billion)%20Years%20Ago%20....JPG "zzi) Basement Rocks, Laying The Foundation - Grand Canyons Story Began 1,840 Million (Nearly 2 Billion) Years Ago ....JPG")