North America 12,000 Years Ago (IMAGE) U.S. National Science Foundation Caption This map shows how North America appeared just over 12,000 years ago. During the Pleistocene, repeated glaciations occurred. Credit Ron Blakey, NAU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.