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Fossil crinoids

Fossil crinoids

E442/0616

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Credit

HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY

Caption

Fossil crinoids. Polarised light micrograph of fossil crinoid sections (round) in siliceous marl. Crinoids are marine echinoderms and have been in existence for 500 million years. These fossils are sections through crinoid stems, which they used to attach themselves to the sea floor. Siliceous marl is a mixture of clays, calcium and magnesium carbonates, and silica. Magnification: x4 when printed at 10 centimetres wide.

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