Winter Collection (IMAGE) Proceedings of the National Academy of Sciences Caption Winter collection of sediment cores from the bottom of Lake Baikal whilst the lake was frozen. Credit Image credit: Anson W. Mackay 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.