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A lost mega-cliff may explain the Grand Canyon’s missing billion years

Scientists have made an exciting discovery about the Grand Canyon's geological history, revealing that a massive ancient cliff system may have exposed its deepest rocks nearly a billion years before the Colorado River began its work. This 'great escarpment' formed around 800 million years ago during the breakup of the supercontinent Rodinia. Over time, erosion has revealed some of the oldest rocks in North America, with the Grand Canyon being the prime example. This research not only fills in gaps in the canyon's history but also sheds light on the mysterious Great Unconformity.
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