*54 
PROCEEDINGS COTTESWOLD CLUB 
1916 
the West-North-West of Berth-llwyd Farm, Old Red Sandstone 
beds are seen. The rock is a hard micaceous red sandstone, 
dipping 30° S.S.W. To the South-West of the farm, by the 
roadside, red marls, dipping 20° W.S.W., are exposed, and 
between these occur Ludlow beds. There is little doubt that 
the Eastern margin of the Silurian beds is a line of fault, as 
the Old Red Sandstone is apparently dipping below the older 
rocks, but there is nothing to suggest that the succession to 
the West is not one of apparent conformity. To the South 
of Berth-llwyd along the top of the valley a line of old workings 
shows yellow sandstone, which dips 5° W.N.W., and from which 
were obtained : — 
Chonetes stviateUa^ Orihis liuiata^ Holopella gvegaria, Ovlhocenis sj). 
while in the steep road leading down to the ford, about a third 
of a mile South of the farm, are hard sandstones, dipping 
10° S.S.W. , and these yielded : — 
Cormilites sp. Orthis lunata. Orthocevas filosum. 
Chonetes striatella Holopella gvegaria 
These are the only exposures now to be seen in this inlier, 
but some three hundred yards to the South, in the stream 
running W'est from Llanfrechfa House, Silurian beds are again 
seen with Old Red Sandstone to the North. 
The latter rock is a red quartzose gritty sandstone dipping 
to the North-East, just below the road from the house, while a 
little lower down Silurian sandstones and thin calcareous beds 
dip 10° S.W. Some yards lower Old Red Sandstone is again 
seen in the North bank of the stream dipping 20° N., while 
Silurian beds in the stream dip 25° S.S.E. It seems plain, 
therefore, that the stream is running along an East and West 
fault line. 
The Ludlow beds here contained : — 
Lingula covnea. Ovihonota. sp Holopella obsoleta. 
Chonetes striatella. Holopella gvegaria ? Orthocevas sp. 
If, however, we continue Westwards along the fault line, 
we no longer find old Red Sandstone immediately to the North 
of it, but Ludlow beds. These are soft yellow sandstones, 
which are seen to the North of the house dipping 20° S.W. 
