Special Report

What the World Was Like a Million Years Ago

John Harrington

Methodology

To help determine what the world was like a million years ago, 24/7 Wall St. reviewed sources such as livescience.com, nasa.gov, universitytoday.com, space.com; insidescience.org; media sites such as pbs.org; and consulted experts including Ron Blakey, geology professor emeritus at North Arizona University, and Gail Ashley, professor emerita, at the Department of Earth & Planetary Sciences at Rutgers University.