'The Grand Canyon is an epic Rosetta Stone for geology,' Denver Museum of Nature and Science geologist James Hagadorn said.
The Grand Canyon may rewrite the textbooks on the Cambrian Explosion—a key turning point in Earth's history when there was a sudden boom in complex life and the emergence of all the major animal groups seen alive today.This is the conclusion of a U.S. team of researchers, led by the University of New Mexico and the Utah State University, who studied the 'Tonto Group', a 0.3-mile-thick collection of five rock formations that are exposed along the sides of the canyon.
According to the team, however, instead of one major transgression with only minor regressions , there are in fact five sedimentary sequences, the lower three of which are separated by gaps in the rock record where material was eroded away.
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