NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Didymograptus, graptolite fossil. Graptolites are an extinct group of marine, colonial animals. Known for their 'tuning-fork' shape, they formed part of ancient plankton. This specimen dates from the Ordovician. It is part of the collections held at the Natural History Museum, London, UK.
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