Ice Core Sample from Antarctica (IMAGE) University of Rochester Caption A thin section of an ice core collected at Taylor Glacier in Antarctica. The ice core samples contain tiny air bubbles with small quantities of ancient air trapped inside. The researchers use a melting chamber to extract the ancient air from the bubbles and then study its chemical composition. The Rochester research focused on measuring the composition of air from the time of Earth's last deglaciation, 8,000-15,000 years ago. This time period is a partial analog to today. Credit University of Rochester photo / Vasilii Petrenko 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.