Abstract
THE oldest exposed rocks in the northern part of the Derbyshire Dome are limestones belonging to the Upper Seminula (S2) Zone of the Dinantian. Previously only one borehole has been considered to have passed through the entire Dinantian sequence of this area into the sub-Carboniferous floor, at Woo Dale, about 5 km east of Buxton1. Drilling commenced in S2 dolomites and continued in limestones and dolomites, all provisionally regarded as Visean in age, to 272 m. Below this a 2 m breccia separated the limestones from volcanic rocks, which were tentatively considered to be Precambrian and' continued to the total depth of 312 m.
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