Mystery of Grand Canyon’s lost rocks may finally be solved

A mystery lies deep within the Grand Canyon: one billion years’ worth of rocks have disappeared. This “Great Unconformity” has rocked the scientific community since it was first described almost 150 years ago. 

“Think of the red bluffs and cliffs of the Grand Canyon as Earth’s history textbook,” Barra Peak, a geologist from the University of Colorado, Boulder, said in a statement. “If you scale down the canyon’s rock faces, you can jump back almost 2 billion years into the planet’s past. But that textbook is also missing pages: In some areas, more than 1 billion years’ worth of rocks have disappeared from the Grand Canyon without a trace.”



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