PROCEEDINGS COTTESWOLD CLUB 
134 
19^6 
The Coed-y-paen anticline is by no means a simple one, 
careful dip observations show that it is much faulted, and the 
broken nature of the outcrop of the Wenlock Limestone is 
found to be due to a series of faults. 
The Eastern or Llangibby anticline is seen from near 
Llwyn-celyn in the South as far North as Cwm Dowlais, and 
shows Ludlow beds above and Wenlock Limestone below. 
It is separated from the Coed-y-paen anticline to the 
West and from the Old Red Sandstone to the East by faults. 
At its summit is a small syncline, which has allowed the 
preservation of a patch of Old Red Sandstone near Pen-y-parc, 
and another small area of this rock is seen a little further West 
as well. 
To the North of Cwm Dowlais Ludlow beds are faulted 
down so that no Wenlock Shales are exposed to the North of 
the Wenlock Limestone in this Eastern part of the Inker. 
As the succession goes down to the Wenlock Shales in the 
Coed-y-paen anticline and the Old Red Sandstone is not 
separated from the Ludlow beds by a fault along much of the , 
margin of this Western tract, the beds of this portion of the 
Inker will be described first and then those occurring elsewhere. 
Ill (A). DETAILED ACCOUNT OF THE 
COED-Y-PAEN AREA. 
{ a ) The Wenlock Shales. 
As the Wenlock Limestone is a rock which is easily recog- 
nised wherever it occurs, it will be convenient to describe the 
underlying Wenlock shales from the base of the limestone 
downwards. 
To the South of the Monkswood drift area the shales are 
frequently exposed and are seen to be dipping at low angles, 
from 4 to 13 degrees below the limestone from near the railway 
at Tynewydd to High Cross Inn. The actual junction with 
the overlying limestone is never seen, but .sandy shales and 
sandstones are exposed not far below the Limestone in all the 
road tracks running down from (he limestone ridge towards 
