Early Ordovician trilobites from Barnicarndy 1 stratigraphic well of the southern Canning Basin, Western Australia

Twenty-three trilobite taxa are described here from the Early Ordovician (Tremadocian to Floian) Nambeet Formation retrieved Barnicarndy 1 drillcore, Canning Basin, Western Australia. This includes one new genus, Veeversaspis gen. nov., and six species: Asaphellus zheni sp. Madiganaspis lauriei Norasaphus (Norasaphus) jagoi Rodingaia leggi Sanbernardaspis excalibur jelli et nov. fauna can be divided into three stratigraphically distinct assemblages, Apatokephalus sp.–Veeversaspis Assemblage (2177.50–2382.94 m depth), trinodosus (2030.07–2177.52 (1595.83–2001.88 depth). The two lowest assemblages consistent with a late latest Tremadocian age (both within Paroistodus proteus Zone). third, highest, assemblage is mid-Floian (within Oepikodus communis systematic contribution refines previous biostratigraphic work based on an age-diagnostic conodont demonstrates stratigraphic utility of using multiple taxonomic groups for more robust estimates.P.M. Smith [[email protected]], Palaeontology Department, Australian Museum Research Institute, Sydney, New South Wales, 2010, Australia, Department Biological Sciences, Macquarie University, 2109, Australia.H.J. Allen [[email protected]], Geological Survey Mines, Industry Regulation Safety, Mineral House, 100 Plain Street, East Perth, 6004,