Abstract
The area described in this paper is about 5 miles east of Rhayader and 4 miles north of Llandrindod Wells. The igneous rocks come to the surface in two localities, namely Baxter's Bank and Caerfagu Mill. The former is approximately half a mile north of the main road from Rhayader to Pen-y-Bont, whilst the latter is situated immediately to the south of the main road and about three-quarters of a mile south-east of the village of Nantmel.

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