1) Burgess Shale fossil 
Marrella splendens is an arthropod known from the middle Cambrian Burgess Shale of British Columbia. It is the most common animal in the Burgess Shale. ==History== Marrella was the first fossil collected by Charles Doolittle Walcott from the Burgess Shale, in 1909. Walcott described Marrella informally as a `lace crab` and described it more form.....