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World's oldest muscle-fibre fossil reveals the origin of legs

It looks like a tattered surgical stocking with legs. But this millimetre-long fossil is one of the best preserved animal fossils from the Cambrian period, 500m years ago. With no mineralised hard parts, worms like this would normally rot and decay long before the processes of fossilisation could get to work. But this exceptional one-off preserves every wart and wrinkle of the animal's skin, along with the fibrous tissues of its muscles.
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