VOT,. XIX. (2) 
THE SILURIAN INLIKR OF USK 
129 
THE SILURIAN INLIER OF USK 
BY 
C. I. GARDINER, M.A., P.G.S. 
WITH A 
PALEONTOLOGICAL APPENDIX 
BY 
F. R. COWPER REED, M.A., D.Sc., F.G.S. 
{Read Febrttary i $ th , igi6.) 
CONTENTS PAGE 
I. Introduction . . . . . . . . . . 130 
II. General Succession and Structure . . 13 1 
III. (a) Detailed Account of the Coed-y-Paen Area 
[ a ] The Wenlock Shales . . . . . . 134 
[ h ] The Wenlock Limestone and its Fossils 138 
(c) The Ludlow Beds . . . . . . 142 
(b) Detailed Account of the Llangibby Area 144 
( a ) The Wenlock Limestone . . . . 146 
( b ) The Ludlow Beds . . . . . . 146 
IV. (a) The Exposures between Cwm Dowlais and 
CwM Cayo . . . . . . . . 147 
(b) The Exposures between Cwm Cayo and 
Llancayo Hill Camp . . . . . . 149 
(c) The Exposures between Llancayo Hill 
Camp and Hill Farm . . . . . . 150 
(d) The Exposures between Bettws-Newydd 
AND ClYTHA . . . . . . . . . . 15 1 
(e) The Exposures on the West Side of the 
Inlier to the North of the Usk Railway 152 
V. The Llanfrechfa Inliers . . . . . . 153 
VI. The Folding and Faulting . . . . . . 155 
VII. General Summary and Conclusions . . 156 
VIII. List of Fossils from the Ludlow Beds and | 158 
Wenlock Shales . . . . . . . . J 159 
Paleontological Appendix, with Descrip- 
tions OF New Species and Varieties by 
F. R. CowPER Reed, M.A., D.Sc., F.G.S. . . 160 
