POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Calcareous phytoplankton fossil. Coloured scanning electron micrograph (SEM) of a fossil of the skeleton (coccosphere) of a coccolithotrope, a small marine algal organism. The coccosphere consists of plates (coccoliths) of calcium carbonate. These skeletons can make up the major component of a limestone rock. This fossil was found in chalk in Rochester, Kent, UK, that was laid down in the Cretaceous period, between 142 and 65 million years ago. Magnification: x5500 when printed at 10 centimetres wide.
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