Latest / America's National Parks, One at a Time
Grand Canyon: Two Billion Years of Rock in One Gorge
The Grand Canyon's layered walls span nearly two billion years of Earth's history, from 1.75-billion-year-old Vishnu Schist at the bottom to 270-million-year-old Kaibab Limestone at the rim. We cover the Great Unconformity's billion-year gap in the record, why the canyon itself is geologically young (5-6 million years), and how five of Earth's seven life zones exist within one mile of elevation change.
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The skinny
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