Alcyonarian
Encyclopedia
The Alcyonarian corals are organisms resembling the octocorals (sea pens). This individual polyps formed colonies and bore sclerites. The Burgess shale
Burgess Shale
The Burgess Shale Formation, located in the Canadian Rockies of British Columbia, is one of the world's most celebrated fossil fields, and the best of its kind. It is famous for the exceptional preservation of the soft parts of its fossils...

 organism Margaretia dorus resembles an Alcyonarian, according to C.D. Walcott (1931), and was reclassified as green algae closely resembling modern Caulerpa by D.F. Satterthwait in her Ph.D. thesis in 1976 and confirmed by Conway Morris and Robison in 1988. Otherwise their fossil record can be traced back to the Cretaceous.
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