The Geology of the District around Corris and Aberllefenni (Merionethshire)

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Abstract
The area described in this paper lies south-east of the main mass of Cader Idris, about the villages of Corris and Aberllefenni. The north-western boundary is the great fault-valley of Tal-y-llyn, lying at the foot of Cader Idris, and along which runs the road from Towyn to Dolgelly, over the picturesque pass called Bwlchllyn-bach. The south-eastern boundary lies parallel, at a distance of some 3 or 4 miles. The area extends from the high ground about Taren y Gesail in the west to Mynydd Dolgoed and Waen Oer in the east, a distance of about 6 or 7 miles. The district lies mainly within the county of Merioneth, but a part extends over the border into Montgomeryshire. It is included in the 1-inch Ordnance Survey Maps, Sheets 149 & 150, in the 6-inch maps of Merionethshire, Sheets XLII, N.E. & S.E., XLIII, N.W., XXXVII, S.E., XXXVIII, S.W., and in the Geological Survey Map, Old Series, 1-inch Sheet 59, N.E. The area is drained almost entirely by tributaries of the River Dyfi. (Dovey), which lies some 4 or 5 miles south of Corris. The most important stream traversing the area is the River Dulas, which passes through the villages of Corris and Aberllefenni. It is along this valley that the main road from Machynlleth reaches Corris and Aberllefenni, and it is also followed by a light railway which affords alternative communication between the abovementioned localities. The regoin is one of some economic importance, and contains important slate- and slab-quarries, which have

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