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Ancient Cliff May Explain Grand Canyon's Missing History | Science News
Scientists have uncovered a massive, ancient cliff system stretching thousands of kilometers across North America—possibly a kilometer high—that may explain a billion-year gap in the Grand Canyon’s history. This colossal escarpment, formed when a supercontinent broke apart, once stood where Arizona, Utah, and the Midwest are today. Over millions of years, erosion stripped away up to eight kilometers of rock, exposing the canyon’s oldest layers before the Colorado River even existed. This discovery sheds light on the “Great Unconformity,” revealing how this ancient continental drop-off shaped…
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