The Relations between the Llandovery Rocks of Llandovery and those of Garth

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Abstract
While we were engaged in examining the districts described in the two preceding communications, we frequently compared notes upon the succession and fauna. These comparisons appeared to show that during the Llandovery Epoch the geological events in one district were reproduced with some exactness in the other. A closer enquiry revealed, however, certain significant differences between the two areas, and, as both the similarities and the differences throw an interesting light upon the earth-movements which affected these areas during the Llandovery Epoch, we believe that it will serve a useful purpose to bring them to the notice of the Society. The observations upon which the comparisons are based are contained in the accounts of the respective areas, except that some additional facts relating to the northern part of the Llandovery district are recorded in this paper and on the map which accompanies it (p. 408). Both districts lie on the eastern flank of the Towy Anticline, and on the same general line of strike. The rocks belong to the shelly facies, but contain an occasional graptolite. About 5 miles away to the west, the Llandovery rocks of Rhayader and of Ystradffin mark the position of the western flank of the Towy Anticline, but these belong to the graptolitic facies. The axis of that anticline is not situated midway between the eastern and the western Silurian outcrops; it must, in fact, pass within a mile or two west of the base of the Silurian in both the Garth and the Llandovery

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