Burgess Shale Fossil
The Burgess Shale beds were formed over half a billion years ago when a mudslide covered a deep sea ridge in what is now modern Canada. The result was some excellently preserved fossilised sea creatures, which were found in 1909 by American palaeontologist Charles Doolittle Walcott.
They are a very rare find, as the soft body tissues have been preserved as well as the hard body parts. These fossils demonstrate the evolution of complex multi-celled animals at the end of the Pre Cambrian period about 600 million years ago. The diversity of life had begun!