LIST OF ILLUSTRATIONS. xxiii 



No. Page 



56. Altered limestone of Nash Scar, near Presteign 321 



57. Alternations of bedded trap and Lower Silurian deposits near Llandrindod 325 



58. Trap and altered schist, Radnorshire . 328 



59. Trap and altered shale near Builth 332 



60. Trap and altered rocks near Builth 333 



61. Trap and altered rocks with mineral spring, Builth 334 



62. Llanwrtyd Wells, Brecknockshire, view near 336 



63. Brecon anticlinal ; transverse section of Ludlow rocks 338 



64. Porphyritic and altered rocks near Llanwrtyd, Brecknockshire 343 



65. Vale of the Towy, Caermarthenshire, view of 347 



66. Noeth-griig, Caermarthenshire, sectional view of, to show the difference between cleavage 



and bedding 35^ 



67- 1 



68. \ Slaty cleavage, concretions, and beds of Cambrian Rocks, Caermarthenshire . . . 359 



69. J 



70. Veins of Gogo-fau, Caermarthenshire . 368 



71. Stackpole Rock, Pembrokeshire, view of . 370 



72. Transverse general section of all the sedimentary groups in Pembrokeshire 375 



73. Culm or coal resting on Silurian Rocks, Pembrokeshire .375 



74. Culm or coal resting on Cambrian Rocks, Pembrokeshire 375 



75. " Slash " of culm, Pembrokeshire, with contorted and broken strata 377 



76. Stackpole, cliffs of contorted carboniferous limestone, view of 382 



77. Skomer Isle, &c, view of, from the main- land, Pembrokeshire 389 



78. Marloes Bay, Pembrokeshire, seen from the west, view of 392 



79. Marloes Bay, Pembrokeshire, sectional view in 393 



80. -1 



81. \ Cleavage coincident with stratification in Pembrokeshire explained 400 



82. J 



83. Trappean conglomerate and dislocated Old Red Sandstone 404 



84. Intrusive trap and Upper Silurian Rocks, Marloes Bay, Pembrokeshire 405 



85. Malvern Hills, view on the western flanks of 409 



86. Section of Volcanic Grit 416 



87- Malvern Hills, general slight sketch of, from the east 417 



88. Arched strata and syenite, Malvern Hills 418 



89. Silurian strata reversed in the Abberley Hiils 421 



90. 1 



9l' I ^ ren ^ oc ^ Limestone dislocated on a line of volcanic fissure, ground plan 421 



92. Silurian strata reversed by Malvern syenite 423 



93. Silurian strata dislocated by Malvern syenite 423 



94. Wenlock Limestone near the Malvern s, contraction and expansion of 424 



95. Woolhope Valley of Elevation, transverse section of 428 



96. Purton Passage on the Severn, showing arched strata upon an anticlinal line .... 446 



97. Tortworth Terrace, Gloucestershire, view from 447 



98. Trap rock near Tortworth .459 



