An Early Permian brachiopod-gastropod fauna from the Calytrix Formation, Barbwire Terrace, Canning Basin, Western Australia

TABOADA, ARTURO CÉSAR; MORY ARTHUR; SHI GUANG R.; HAIG DAVID; PINILLA KARINA

ALCHERINGA

TAYLOR & FRANCIS LTD

Lugar: Londres; Año: 2015 vol. 39 p. 207 - 223

0311-5518

A small brachiopod-gastropod fauna from a core at the base of the Calytrix Formation within the Grant Group includes the brachiopods Altiplecus decipiens (Hosking), Myodelthyrium dickinsi (Thomas), Brachythyrinella narsarhensis (Reed), Neochonetes (Sommeriella) obrieni Archbold, Tivertonia sp. nov.? and the gastropod Peruvispira canningensis sp. nov. The fauna shows affinities with that of the late Sakmarian-early Artinskian Nura Nura Member directly overlying the group in other parts of the basin but, as with all Lower Cisuralian (and Upper Carboniferous) glacial strata in Western Australia, its precise age remains poorly constrained especially in terms of correlation to international stages. Although the Calytrix fauna lies within the Pseudoreticulatispora confluens palynozone, the only real age constraint on its age (and that of the associated glacially influenced strata) is from stratigraphically younger faunas. A brief review of radiometric ages from equivalent strata elsewhere in Gondwana shows that those ages need to be updated. The presence of Asselian strata and the position of the Carboniferous‒Permian boundary remain unclear in Western Australia.