NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Marrella arthropod fossil. Burgess Shale specimen of Marrella splendens, a small, aquatic arthropod. The Burgess Shale rocks of Canada's Rocky Mountains preserved soft tissue details rarely found in the fossil record. This recorded the Cambrian Explosion of around 500 million years ago, the evolution of a diverse array of invertebrates from which today's animals evolved.
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