NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Trilobite fossils, mounted slab. This slab, located in the Keeper's Meeting Room at the Natural History Museum, London, UK, is known as the butterfly stone (Hu-die-shih) and was obtained from Shantung Province, China. The butterfly-like shapes are partially seen Drepanura trilobite fossils. It is thought these specimens of these extinct marine arthropods date from the Upper Cambrian (around 488 to 500 million years ago). The term Keeper refers to the leaders of the departments at the Natural History Museum.
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