Burgess Shale fossil quarry. These rocks contain large numbers of fossils from 500 million years ago. They were formed when an avalanche of fine mud buried and preserved a large number of marine animals. The site is remarkable for the excellent preservation of invertebrates. It recorded a key moment in Earth's history,the Cambrian Explosion,when an unprecedented period of evolution produced a wide diversity of body types,including those of today's animals. The site,in Canada's Rocky Mountains,was discovered in 1909 by Charles D. Walcott. It is now a UNESCO World Heritage Site. The sedimentary rock layers are clearly seen. Photographed at Walcott Quarry | |
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Credit: | Science Photo Library / Sirulnikoff, Alan |
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