A Cambrian series 3 (Guzhangian) fauna with 'Centropleura' from Northern Victoria Land, Antarctica

A Cambrian Series 3 (Guzhangian, probably lower Lejopyge laevigata Zone) trilobite assemblage is described from the northern Bowers Mountains, Northern Victoria Land, Antarctica. This is the oldest known fossil assemblage from the northern Bowers Mountains. There are ten agnostoid taxa including the widespread species Lejopyge armata, L. calva, Onymagnostus hybridus, Acidusus aculeatus and Goniagnostus nathorsti. The nine polymerid taxa include the cosmopolitan genus Centropleura plus the widespread genera Fuchouia, Pianaspis and Acontheus. Acontheus is recorded from Antarctica for the first time. A revised diagnosis of Acontheus is given. The fossils occur within a succession of mudstone with thin layers of calcareous mudstone and concretionary bands that are more resistant than the mudstone; an outer shelf to upper slope depositional environment is proposed.