MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
A fossil crinoid, Pentacrinites fossilis, showing the stem with numerous root-like cirri and the long main arms of the crinoid "head". At one period in prehistory, "meadows" of such crinoids grew on the floor of a warm shallow sea that covered southern England. This specimen, found in Lyme Regis, Dorset, in the UK, has been replaced by the brassy-looking mineral pyrite (iron sulphide).
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