VOL. XIX. (2) 
THE SILURIAN INLIER OF USK 
IV. (^/) EXPOSURES BETWEEN BETTWS-NEW YDD 
AND CLYTHA. 
Very much of the country between Bettws-Newydd and 
Clytha is drift covered, and it is only in a few exposures to 
the South-East and to the North of the drift that any ex- 
posures of Silurian rocks are to be seen. To the South-East, 
near the margin of the Inlier, Ludlow sandstones containing 
Chonetes striatella are seen round the farm called Upper Berth- 
Iwyd. 
About half-a-mile further North is the farm called Hilla, 
and here are sandstones dipping North-North-East, though 
close to the margin of the Inlier they swing round and dip 
South-East. They have yielded Dayia navicula. 
On the North-Western side of the drift area Ludlow beds 
are exposed in the neighbourhood of Clytha Castle. 
Abbout 400 yards South of the Castle is an old quarry 
in sandstones with calcareous nodules, which dip 10° N., and 
are covered by a thin capping of drift. 
Clytha Castle itself is on drift, but at the farm Ffynnonau, 
300 yards to the North-East, is a quarry in Ludlow sandstones, 
which dip 10° N., and contained : — 
Styopheodonta plosa ? 
Ovthothetes aplanata. 
Chonetes striatella. 
Ortliis liinata. 
Dayia navicula. 
.'Itrypa reticularis. 
Spirifer crispus. 
W hitpeldella didyma. 
Pterinea navijormis. 
,, iineatiila. 
Palceopecten Danbyi. 
Cucullella ovata ? 
Grammysia sp. 
Modiolopsis sp. 
Gonio phora cynibceforniis 
Orthonota impressa. 
A nodontopsis quadrat as 
Orthoceras angulation. 
Calymene sp. 
Three hundred yards further North the Abergavenny road 
climbs up from the Usk and passes through a deep cutting. 
This gives a magniftcent section through Ludlow beds, and 
shows about 12 feet of sandstones covered by 54 feet of sandy 
shales, calcareous sandstones, and thin calcareous layers, all 
dipjhng 12° E. They contain Dayia navicula. 
The relation of these Silurian beds to the Old R('d Sand- 
stone to the East is quite obscured by drift. 
