The Higher Silurian Rocks of the Kerry District, Montgomeryshire

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Abstract
The north-western part of the upland tract of Clun Forest is shown on the Geological Survey maps (sheets 56 and 60) to be composed of a wide belt of rocks of Ludlovian age, overlain to the south-east by a roughly circular outlier of “Old Red Sandstone” known as the Bettws-y-crwyn outlier. The area dealt with here includes the north-western part of that outlier and a considerable part of the Ludlovian belt to the north and west, forming the borderland of the counties of Radnorshire, Shropshire, and Montgomeryshire. The district has been studied on the six-inch scale: namely, on the Ordnance Survey maps, Montgomeryshire XLIV NW. and SW., XLIII NE. and SE., Radnorshire IV NE., and Shropshire LXVIII NW. Like all the Clun Forest district, the general elevation of the ground is from 1000 to 1500 feet, and the southern and eastern sides of the hills are mostly gentle dip-slopes, while the northern and western sides are steeper scarp slopes. The main ridge of high ground, Kerry Hill, forms the watershed between the streams flowing north-eastwards into the Severn, and the south-easterly flowing Teme and its tributaries. The south-westward extension of Kerry Hill and the high ground around Gorddwr Bank form the watershed between these two drainage systems and the south-westerly flowing tributaries of the Ithon. The valleys are mostly filled with drift, and the glacial geology of the district has been discussed by Dwerryhouse and Miller (1930). Murchison (1839) gave a general description of the “OuTliers of Old Red Sandstone

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