VOL. XIX. (2) 
TilE SILURI.VN LNLIER OF USK 
153 
strip of Ludlow beds to the West of the great central mass of 
Wenlock Shales. • 
The only other exposure of Silurian beds to the West is 
in the railway cutting, close to the Reformatory School, about 
a mile and a quarter to the South-West of the last-mentioned 
exposure. Here are seen sandy shales with thin calcareous 
partings, dipping 30° E.S.E. They contained ; — 
Cornulites seypularius. Cainarotcechia )iHCula Holopella ? sp. 
Chonetes striatella. Orthonota sp. Orthoceras sp. 
Oythis lunata. 
These beds seem to be entirely surrounded by drift, but 
as they lie well to the West of the boundary of the Inlier to 
the South of the Usk railway, where Wenlock Limestone is 
faulted against Old Red Sandstone, it seems probable that an 
East and ^^Tst fault runs somewhere close to the railway 
and shifts the boundary of the Inlier on the North to the West. 
Though these exposures along the Western side of the 
inlier to the North of the Usk railway are too scanty to enable 
one to speak with certainty about the arrangement of the beds, 
yet it is clear that they are of Ludlow age to as far North as 
Tump Farm, and it seems probable that we have here a set of 
Ludlow beds faulted off from \^Tnlock Shales to the East, 
and from Old Red Sandstone to the \^Tst. 
Jhtliologically these beds correspond to the lower set of 
Ludlow beds seen in the Coed-y-paen anticline, and the fossil 
evidence tends to confirm this view. 
V. THE LLANFRECHFA INLIERS. 
About a mile-and-a-half to the South of Llandegveth is 
the village of Llanfrechfa, which is partly situated on a small 
inlier of Silurian rocks, while another, and slightly larger, 
inlier lies between this one and the Silurians of Usk. Though 
the exposures in these two small areas are few, yet no account 
of the Silurian rocks of Usk would be complete without some 
reference to them. 
'J'he Northern Llanfrechfa inlii'r is crossed from North to 
South by the Candwr brook, and in the bed of this stream to 
