The Geology of the District around Meifod, Montgomeryshire

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Abstract
Previous work in the area.—The Meifod district was visited by Sedgwick on various occasions in 1832, and again in 1842 and 1843, in the last-mentioned year in company with J. W. Salter. It was from this district that several of the types described by McCoy were collected, and also many of the fossils recorded in Salter's catalogue were obtained during these visits. It seems strange, since this district was in many ways a connecting link between Sedgwick's Bala succession and Murchison's Shropshire succession, that no further work has been published since Salter's catalogue in 1873. The general succession was established by Sedgwick, but the exact horizons of some of the beds and the relationship between them needs revision in places: thus Sedgwick attributed the absence of the May Hill Sandstone to the unconformable overlap of the Wenlock Series, whereas, as will be shown in the sequel, the succession is complete at this horizon. It is also unfortunate that the beds in the Mathrafal section were placed by Salter in the Upper Bala (Llandovery rocks = Lower Llandovery of the Geological Survey), since it would now appear that they belong to the base of the Upper or top of the Middle Llandovery of the type area. The Caradocian deposits on the whole occur in the northern part of the area under discussion, where they form the folded southern flank of the Berwyn dome and the cores of the series of anticlines which run off south-westwards from the main dome. The strata

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