Fossil specimen of Opabinia regalis from the Burgess shale on display at the Smithsonian in Washington, DC. This appears to be the exact specimen pictured in Fig. 42 of 'The Crucible of Creation: The Burgess Shale and the Rise of Animals', by Simon Conway Morris, Oxford University Press, 1998.
The Strangest Cambrian Creatures Ever Discovered
Hallucigenia: a Burgess Shale fossil. The Burgess Shale Formation in the Canadian Rockies of British Columbia, is one of the world's most famous fossil fields. At 505 million years (Middle Cambrian) old, it is one of the earliest fossil beds containing exceptionally well preserved soft-part fossils.