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The seismic profile and geologic section shown in Figure 2 is taken across the north margin of the platform. The lack of deformation is evident in the section with the present basin topography essentially unchanged from the end of the Visean. Uplift and doming of the platform has resulted in the removal of between one to two km of Namurian and Westphalian sediment. The maximum cover for the platform is therefore somewhere between one and two km with maximum basin depths on the order of five km attained towards the end of the Carboniferous.for the top of the platformevidence for high pore fluid pressures during the period of faulting with the development of mode I fractures and in places a pervasive mesoscale fracture network. Fracture dimensions range from sub-mm to fault widths of several metres. Fracture and fault vein fill at all the locations is dominated by white, sparry calcite often showing a syntaxial growth pattern with varying degrees of complexity as a result of repeated episodes of movement, brecciation and renewed hydrothermal mineral growth.