The Grand Canyon is missing over a billion years of rocks. Now scientists know why.
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More than a billion years of geological history is missing from the walls of the Grand Canyon, and now, scientists may know why. In the canyon's sides, ancient metamorphic and igneous rocks that formed 1.7 billion years ago sit directly under younger sedimentary rocks laid down 500 million years ago. The 1.2 billion-year chunk of history in between wasn't preserved — leaving a geological gap known as the Great Unconformity. This missing period was a very important time in Earth's history, becaus
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