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Figure 1. Location and regional geology of the Peak District area of the southern pennines. (A) Geographic location; (B) Visean palaeogeography showing the distribution of basement (Wales-Brabant High), platform and basin facies sediments. Major normal growth faults that bound the basins are indicated in red; (C) Location of Dirtlow Rake in relation to the platfrom margin and major mineralised faults and veins indicated in red. The line A-B marks the line of the geologic section in shown  Figure 2. The dotted line that runs sub-parallel to the line of section indicates the approximate line of the seismic section shown in Figure 2.