PATRICK LANDMANN / SCIENCE PHOTO LIBRARY PATRICK LANDMANN / SCIENCE PHOTO LIBRARY
Fossilised foraminiferan. Scanning electron micrograph (SEM) of a section through the fossilised shell of a foraminiferan in a sample of limestone. Foraminifera are single-celled aquatic protozoa that construct and inhabit shells composed of several chambers. The shells form an important component of chalk. In previous geological ages foraminifera occurred in such enormous numbers that their shells, largely of calcium carbonate, have formed immense fossil deposits seen today as limestone.
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