The first Americans could have taken a coastal route into the New World

Glacial retreat had cleared a path along Alaska’s shores by 17,000 years ago

Geologist Alia Lesnek

DEICED PASSAGE  Rocks on an Alaskan island display smooth surfaces covered by cracks created when ice once moved over them. Alia Lesnek (shown) and colleagues have determined that ice on this and three nearby islands retreated about 17,000 years ago, just before ancient humans colonized the Americas.

Jason Briner

This article is only available to Science News subscribers.

Subscribers, enter your e-mail address to access our archives.

Not a subscriber?

Science News is a nonprofit.

Support us by subscribing now.

More Stories from Science News on Climate

From the Nature Index

Paid Content