Reflected Light Image of the Shell of a Fossil Planktic Foraminifera Globigerinoides Ruber (image) University of Southampton Share Print E-Mail Caption Reflected light image of the shell of a fossil planktic foraminifera Globigerinoides ruber. The boron isotopic composition of the shells of this species was used to reconstruct atmospheric CO2 1 million years ago in this study. Credit Tom Chalk Usage Restrictions None Share Print E-Mail 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.