Ice Age Illustration (IMAGE) Rice University Caption This is an illustration depicting the minimum (interglacial, black) and maximum (glacial, grey) glaciation of the northern hemisphere during the ice age that began about 3.2 million years ago. Credit Hannes Grobe/AWI/Wikimedia Commons Usage Restrictions Credit must be used. 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.