A Micrograph of 2 types of Foraminifera (IMAGE) University of California - San Diego Caption A micrograph of two types of foraminifera, M. sinuosa and W. baltica, and uses to study climate conditions during the Cretaceous Thermal Maximum, 91 million years ago. Credit 2007 Scripps Institution of Oceanography, UC San Diego 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.