Abstract
The Namurian and lowest Westphalian beds of the Millstone Grit are mapped between Brynmawr and Blorenge, South Wales. It is shown that a phase of secondary dolomitisation is related to zones of close jointing of post-Carboniferous age. This has led to easier weathering of the more friable dolomite which in turn has resulted in irregularities along the Millstone Grit-Carboniferous Limestone junction. Details of an easterly directed overstep of Namurian B (R 2) age are described together with a further possible overstep of early Westphalian ( lenisulcata Zone) age.
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