Recently, my girlfriend brought me a great toy trilobite from the Royal Ontario Museum. It came as part of a collection of Burgess Shale fauna replicas, based on research carried out by the museum's Paleontology Department in an effort to gain greater understanding of the creatures of the Cambrian ocean. The Burgess Shale is located in the mountains of British Columbia, and contains some of the best preserved Cambrian fossils in the world, prized for their incredible detail. They show remarkable preservation of even soft tissue, making them extremely valuable. We are able to see many structures that are normally destroyed before fossilization, including the legs, gills and antennae of the trilobite Olenoides serratus (below).
Also include are Wiwaxia; a sort of armored slug, Pikaia; an early chordate, Laggania; kind of a big, nasty sea-monkey, and Opabinia, a crazy, five-eyed creature with a mobile proboscis at the end of which is its presumed mouth. These creatures are just a small sample of the life from that ancient time of incredible biodiversity.