On the Pre-Cambrian and Cambrian Rocks of Brawdy, Hayscastle, and Brimaston (Pembrokeshire)

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Abstract
I. Introduction During the recent revision of the geology of the Pembrokeshire coalfield by the Geological Survey, a portion of the area dealt with in this paper had to be surveyed by one of us on the scale of 6 inches to the mile. The work had not progressed far before it was recognized that this area was one of exceptional interest, and one in which the relations of the Lower Cambrian to the pre-Cambrian rocks could be made out with little difficulty. We therefore decided to make an unofficial survey, on the same scale, of that portion of the district, containing Lower Cambrian and older rocks, which lay beyond the limits of the proposed publications of the revised geological survey. The area surveyed and represented by the appended map (Pl. XL) is that portion of Pembrokeshire which stretches from the River Cleddau at St. Lawrence to St. Bride's Bay at Newgale, and includes the villages of St. Lawrence, Hayscastle, and Brawdy. Its total length from east to west is about 9 miles, and it has a maximum breadth of about 2 miles. The country is of low relief, seldom rising to more than 400 feet above sea-level, and forms a somewhat elevated part of the West Pembrokeshire plain. The surface-configuration has but little relation to the nature or texture of the rocks beneath, and natural exposures are of rare occurrence, except on the sides of the deeper valleys and in the sea-cliffs. Before proceeding to a description of the

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