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The Cadair Idris district lies at the southern edge of the Snowdonia National Park and, from the high ridges of the Cadair Idris massif to the tidal reaches of the Mawddach and Dyfi estuaries, it is an area of spectacular beauty. For many geologists it is a special place as it lies close to the heart of Sedgwick's Cambrian System. The survey of the Cadair Idris district has followed those of the Harlech, Snowdon and Bangor districts to the north and has broadened the correlation of the Cambrian and Ordovician sequences in north-west Wales.
A detailed account of the geology shown on the complementary 1: 50 000 (or earlier 1: 63 360) geological map(s)
This booklet provides a detailed, illustrated account of the geology, glaciation and drainage of the Barmouth and Arthog area of North Wales.
The district described in this memoir (1:50 000 geological sheet 134) covers the central area of the Llyn Peninsula in north-west Wales. The solid rock types vary from deformed m'lange and Precambrian granites, through an array of Cambrian and Ordovician clastic sedimentary rocks, to a wide range of tholeitic to alkaline and ultrabasic to acid igneous rocks.
This memoir describes the geology of part of the Welsh Borderland. Precambrian and Ordovician rocks of the Shelve crop out in the north but Silurian rocks underlie most of the district, providing an insight into the development and infill of the Lower Palaeozoic Welsh Basin. The district is notable for a number of earthquakes, and a brief history of recent seismic events is included.
A brief explanation of the geology shown on the relevant 1: 50 000 scale geological map(s).
A brief explanation of the geology shown on the relevant 1: 50 000 scale geological map(s).