xxii 



LIST OF ILLUSTRATIONS. 



No. 



13. Fossils of the Coal Brook Dale Coal-field 105 



14. Coral of the Carboniferous Limestone 107 



15. Basalt of the Clee Hills 12 5 



16. Coal and Basalt of the Clee Hills i 2 >j 



17. Newent Coal-field, section across. N.B. In this wood-cut the coal on the eastern side 



ought probably to have been placed beneath the base line by a downcast fault . . . 155 



18. Castel-cerrig-cennen, Caermarthenshire, view of 162 



19. Old Red Sandstone in Hereford and Brecon, view of mountains of 169 



20. Old Red System, general descending section of 171 



21. Trap dyke, Brockhill, Worcestershire, view of 185 



22. Silurian System, general descending section of 196 



23. Cophinus Ludensis, a nondescript fossil of the Upper Ludlow Rock (see also PI. 26, f. 12) 199 



24. Ludlow Rocks overlying the Wenlock Edge, sectional view of 208 



25. Wenlock Limestone, detailed section of 210 



26. Lincoln Hill, quarries of Wenlock Limestone, view of ...211 



27. Caradoc Sandstone, quarry of 218 



28. The Wrekin seen from the south-east 232 



29. 



Dislocations of Ludlow Rocks 237 



• 299 



32. Whiteway Head, near Ludlow, view of — joints distinguished from beds 243 



33. Concretions, joints and beds 245 



34. Landslip at the Palmer's Cairn, or Churn Bank near Ludlow, view of 248 



35. " Bone Well " near Ludlow, joints in the rocks at 250 



36. Longmynd Hills, view in the 255 



37. Trap and Cambrian Rock in the Longmynd 260 



38. Trap, Cambrian Rock and bitumen at Haughmond Hill . 265 



39. Stiper Stones, Salop, view from 268 



40. Volcanic Grit, view of quarry of 270 



41. beds of . 271 



42. ] 



^ V Eruptive trap rocks in the Corndon Hills 274 



44. Trap dyke and altered rocks in the Corndon Hills 274 



45. The Breidden Hills, view of their summit 287 



46. Trap rock of Nantcribba, Montgomeryshire, section 288 



47. Trap rock of the Standard Quarries, Welch Pool, view of ... 288 



48. Union of concretionary and prismatic trap at Welch. Pool 289 



49. Trap and altered rocks, Moel-y-golfa, Breidden Hills . . 293 



50. Powis Castle, section at 304 



51. Contorted Upper Silurian Rocks . 312 



52. Nash Scar, Radnorshire, altered limestone of 313 



53. Trap rock of Old Radnor, throwing off limestone and conglomerate 319 



54. ] 



I Trap and altered rocks near Old Radnor 320 



55. J 



