Earth’s rocks have a missing layer spanning up to a billion years. Scientists finally know what happened to it
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The ‘Great Unconformity’ has puzzled scientists since its discovery in the 1870s Go to Story
Earth’s churning mantle may have created the Great Unconformity
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In the Grand Canyon, there is a line in the rock where time seems to have gone missing. Ancient crystalline rocks mark its bottom, while sandstones laid down as life started to diversify during the Cambrian explosion mark the top. “It’s…