VOL. XIX. (2) THE SILURI.AX INLIEH OF IJSK 
•3v 
massive Limestone are exposed. The Limestone is bent here 
into shallow folds so that its outcrop is very wide compared 
to the width seen elsewhere in the district {v. fig. 3). 
(6) The next stretch of Limestone is seen in a large quarry 
near Fyn-y-caeau farm, where 12 feet of the massive Limestone 
is seen underlying layered limestone. 
■EWAUN Stream Cii.wrgi 
1 , 
Fig. 3. — North and South Section through Cilwrgi, ^ mile East of Christchurch Common, Coed-y-]iaen. 
Horiz : .Scale 6" = i mile. Vert : Scale exaggerated. 
(7) To the North of this, near Cilfeigan, are quarries 
showing sandy beds on 4 feet of sandy beds with calcareous 
nodules, and below these, 8 feet of compact Limestone con- 
taining many crinoid fragments. 
(8) The small stretches of Limestone in the neighbourhood 
of Cefn-Ila are very poorly exposed, while the final extension 
near Rhadyr is seen in some old, much overgrown workings. 
Besides occurring in the Coed-y-paen Anticline, Wenlock 
Limestone is also seen in the Llangibby Anticline in Cwm 
Dowlais. Here it is bent into an arch, and forms the lowest 
visible bed of the Anticline. The section here is as follows : — 
Irregular Limestone bands with sandy shale partings. 
10 feet of compact Limestone. 
12 feet of Limestone in irregular layers with sandy .shale partings. 
5 feet of compact Limestone (seen at base). 
From the sections now visible we may therefore say that 
in the Usk Inlier the Wenlock Limestone is over thirty feet 
thick, and though, as no complete section through it exists, 
its maximum thickness cannot be stated with accuracy, it is 
probably 35-40 feet. 
It usually occurs in irregular layers, separated by thin 
sandy deposits, the layers of Limestone being only some 4 inches 
thick. But amongst this thin bedded Limestone there occur 
