This guy has really done his homework! I especially like that he shows how much larger the landmasses became when sea levels were 130 meters (426 feet) lower than today.
This is so cool! Watch as the ice advances over Seattle, Tacoma and Olympia and then retreats during the last 20,000 years.
Extent of Glaciation in various parts of the world
TV interview – “Not by Fire but by Ice”
Ice-age maps for North America and other parts of the world.