Foraminifera (IMAGE) University of California - Riverside Caption Foraminifera shells helped scientists piece together a picture of ocean movement during the Eocene period, where high atmospheric carbon levels caused the exchange of ocean waters to slow down. Credit Marci Robinson, USGS Usage Restrictions No restrictions. License Public Domain 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.