Abstract
Abstract Uplift centred on the Irish Sea in latest Cretaceous times accompanied by a locally raised geothermal gradient is supported by apatite fission track analyses from the area, the outcrop patterns of the Mesozoic rocks of England and the positive gravity anomalies over the whole of the Irish Sea region. This conclusion allows more precise modelling of the history of the region and the lost Mesozoic cover can be reconstructed, with varying degrees of certainty, by combining the results of extrapolation from existing land and submarine outcrops and subcrops, with the amount of cover lost. Stratigraphical considerations suggest the occurrence of both Late Cimmerian and latest Cretaceous inversions of the Irish Sea area. Following rapid erosion of the central part of the domed area in the Palaeogene, alluvial plain sedimentation was established over the Irish Sea region, developing around valleys cut through the Mesozoic sediments of the area. Deflation of the dome and accompanying faulting allowed the sea to enter the area, initially primarily through St George’s Channel in the early Oligocene and into the whole of the basin in Neogene times.
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