UPPER STEPTOEAN (UPPER CAMBRIAN) TRILOBITES FROM THE MCKAY GROUP OF SOUTHEASTERN BRITISH-COLUMBIA, CANADA

An abundant and well preserved trilobite fauna is described from Upper Cambrian calcareous mudstones of the McKay Group, near Cranbrook in s outheastern British Columbia. The trilobites are mostly articulated, c onsisting of similar numbers of molts and carcasses. They are represen tative of a new deep water biofacies, the Wujiajiania Biofacies, and a new Wujiajiania sutherlandi Fauna of late Steptoean age. The trilobit es were collected from a narrow interval (<2.0 m thick) of richly foss iliferous strata, in a thick sequence of unfossiliferous to sparsely f ossiliferous strata of similar lithology. The fauna includes fourteen species, six of which are new: Aciculolenus palmeri, Burnetiella leech i, Hedinaspis canadensis, Labiostria westropi, Pterocephalia norfordi, and Wujiajiania sutherlandi.