Abstract
Abstract Contemporaneous erosion and reworking of sediment is now known from a wide scattering of locations within the Dinantian rocks of the South Munster Basin. The phenomenon is most marked close to the northern margin of the basin, which lay within the Cloyne Syncline from Cork Harbour westwards to Ballygarvan. Exploration drilling further west in this syncline, near Inishannon, has found Dinantian/Namurian basinal sequences containing thicknesses of breccias with shelf carbonate clasts. The northern basin margin continues obliquely across strike westwards to cross the extension of the Cork Syncline near Crookstown, where recent drilling has located the basin margin. There is no evidence of reworking in the basin during the latest Devonian-early Tournaisian. A widespread sequence boundary is recognized in the middle Tournaisian (base of Courtmacsherry-Reenydonagan Formations). Within the Kinsale sub-basin, Member 2 Courtmacsherry Formation is a silt-sand unit within a mudstone-carbonate sequence; sourcing of the sand demands considerable intrabasinal or basin margin erosion. In the Bantry sub-basin, reworked conodonts occur at different levels within Member 3, Reenydonagan Formation (late Tournaisian to Arundian). There is indirect evidence for a carbonate shelf or intrabasinal high of Tournaisian to Asbian age in this western region.
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