I. D. Somerville, C. N. Waters, 2011. "Dublin Basin", A Revised Correlation of Carboniferous Rocks in the British Isles, C. N. Waters, I. D. Somerville, N. S. Jones, C. J. Cleal, J. D. Collinson, R. A. Waters, B. M. Besly, M. T. Dean, M. H. Stephenson, J. R. Davies, E. C. Freshney, D. I. Jackson, W. I. Mitchell, J. H. Powell, W. J. Barclay, M. A. E. Browne, B. E. Leveridge, S. L. Long, D. McLean
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The Carboniferous rocks of the Dublin Basin extend from the east coast of north Co. Dublin westwards to the River Shannon at Athlone and northwards to the Lower Palaeozoic rocks of the Longford-Down Massif (see Strogen et al. 1996, fig. 5; Sevastopulo & Wyse Jackson 2009, fig. 10.13 & Fig. 57). They occur in counties Longford, Westmeath, Meath, north Co. Dublin, north Co. Offaly, north Co. Kildare and south Co. Dublin. Most of the rocks in the region belong to the Mississippian Subsystem, with Pennsylvanian strata preserved only in boreholes at Kingscourt (Fig. 58, Col. 1). The marine Tournaisian strata present above a basal continental siliciclastic facies are represented by three contrasting lithological successions referred to as the North Midlands, Kildare and Limerick provinces (see Philcox 1984; Strogen & Somerville 1984; Sevastopulo & Wyse Jackson 2009).
During the Tournaisian there was a gradual northward advance across Ireland of the marine transgression with associated deepening. In the Dublin Basin the arrival of marine sedimentation did not take place until the late Tournaisian (Pseudopolygnathus multistriatus conodont Biozone and PC miospore Biozone; Jones et al. 1988; Sevastopulo & Wyse Jackson 2009). Diachroneity of lithological units can be recognized when traced from south to north across the basin (see Sevastopulo & Wyse Jackson 2009). In the northern part of the Dublin Basin, above the basal red-bed facies, the marine Tournaisian succession forming the North Midlands Province (Philcox 1984) has been divided into two groups, the Navan and Cruicetown groups (Strogen et al. 1990).