Prehistoric Glaciers: How Ice Ages Sculpted the American Landscape
You live on the aftershock of ice. Whether you stand on a rocky New England hill, a flat Midwestern cornfield, or a U-shaped valley in the Rockies, you’re standing in a landscape carved, scraped, and rearranged by glaciers that vanished thousands of years ago. Those ancient ice sheets were unimaginably large, as thick as skyscrapers ...












