636 ME. D. C. EVANS ON THE OEDOVICTAN [NOV. I906, 



Eeference has already been made to the dips at these two 

 localities, and to the structure that they suggest (p. 627). 



"West of the Eiver Tave the same beds are seen in a quarry near 

 Bronhaul. This, probably, is Phillips's ' Upper Moor ' fossil-locality. 

 Fossils are fairly abundant and typical. 



The narrow belt of folded-in beds of this age between Moelden 

 and Llanddowror does not yield any fresh samples of the rock, and 

 the weathered material is slightly different from that furnished by 

 these beds elsewhere. 



The beds are not typically exposed at Llanddowror. They are 

 undoubtedly represented there, but not well developed. 



At C16g-y-fran, however, beds of Llandeilo-aber-Cowyn type are 

 well seen in the farmyard, where they are faulted against Didymo- 

 graptus-bijidus Beds and Asaphus-tyr annus Limestones (see p. 599). 

 The beds are exposed, in a very rotten condition, near the pond ; but 

 fresh samples may be obtained from the lane in the field close by, and 

 in the yard near the stables. They dip northwards at about 45°. 

 Along the bottom of the yard higher beds, with abundance of typical 

 fossils, are seen dipping under them. This is another indication of 

 the overfold referred to above (p. 614). 



Beds of the same age and of similar character are exposed behind 

 the old cottage at Cwm-caedu. Here they are seen to succeed the 

 black shales, and they pass up to the next stage in the vicinity. 

 Fossils are not abundant, but the few that do occur are of the 

 characteristic type. 



(/3) Sholeshook Beds. — These differ somewhat from those just 

 described, in being much more arenaceous, and generally coarser in 

 texture. On weathering, they produce sandstone of fair quality, but 

 the material is often nothing better than loose sand. Fossils are, 

 as a rule, very abundant. 



The upper part of the section at Llandeilo-aber-Cowyn doubtless 

 exposes beds of this age, but they are not so sandy. 



At Foxhole, however, the succession is well seen. I availed 

 myself of an opportunity to examine a continuous section from the 

 Foxhole exposure to the old quarries on the brow of the hill near 

 Trefanty, where the arenaceous beds have been much quarried in 

 years gone by. Under ordinary circumstances, the relation of the 

 two groups can be clearly made out here. These old quarries have 

 yielded many fossils : big slabs have been seen which were covered 

 with Trinucleus seticornis, His. and tails of Cyhele verrucosa. Dalm. 



These beds are well developed and extensively quarried at 

 Llanddowror, 2 miles west of St. Clear's. They crop out along 

 the brow of the ridge running in a north-westerly direction from 

 the quarry — through the Gelli Wood, narrowing the valley of the 

 Tave near C16g-y-fran Bridge, and rising in a bold bluff on the north 

 of the gorge — where they have been more or less extensively 

 quarried. They cross the Tave a short distance south-west of Clog- 

 y-fran, a small exposure in the meadow indicating their strike, but 

 they appear to be cut off by a fault at no great distance. 



