Biostratigraphical Dating of Upper Viséan Limestones (NW Ireland) using Foraminiferans, Calcareous Algae and Rugose Corals

Abstract:Foraminiferans, calcareous algae and rugose corals from many sections in the Glencar Limestone, Dartry Limestone, Bricklieve Limestone and Meenymore formations in north-western Ireland have been analysed. Results from the fauna and microflora suggest that these formations constitute the early to late Asbian for the Glencar Limestone Formation and lower Bricklieve Limestone Formation (Cf6β-Cf6γ foraminiferal subzones), and the upper part of the late Asbian for the Dartry Limestone Formation and upper Bricklieve Limestone Formation (Cf6γ Subzone). The succeeding Meenymore Formation in the studied area is assigned to the Brigantian (Cf6δ Subzone). Goniatite biozonal schemes established previously for equivalent strata to the east in the Cuilcagh Mountains that are not in harmony with the dating proposed here are discussed.