X. 



J.IST OF PLATES AND TABLES. 



PAGE 



12 Diagram of dip of Strata of 



equal thickness . . .98 



13 Strata thinning out downwards 99 



14 Strata thickening downwards . 99 



15 Strata thinning out on an old 



uneven sea bed . . 99 



16 Strata thickening downwards 



on an, uneven sea-bed . 99 



17 Strata of equal thickness, at an 



angle on uneven sea-bed 100 



18 Coin of Lysimachus with the 



horn of Ammon . . .112 



19 Section of the Clee Hills at 



Oreton . . . .122 



20 The Elled Patch, Beaufort, 



South Wales . . .126 



21 Section of Rocks from Silurian 



to Oolite . . . .131 



22 Section of Rocks, New Red 



Sandstone, to Lias . . 133 



23 Section, Wenlock Limestone, 



and New Red Sandstone 134 



24 Section of the Plain of Thing- 



valla . . . .145 



25 Grand Plan of Plain of Thing- 



valla . . . .146 



26 Outline of Calyx of Hydreiono- 



crinus . . . .147 



27 Teeth of Anchiterium Radegon- 



dense . . . .153 



28 Section of a Geysir . . .176 



29 Plan of Calyx of Hydreiono- 



crinus (?) globularis . .181 



30 Plan of Calyx of Pisocrinus 182 



TAGE 



31 Section of American Rocks, 



Millstone Grit to Lower 

 New Red . . . . 188 



32 Section of Carboniferous Rocks 



near Mitcheldean . 226 



33 Sifter for Fossil Microscopic 



and Minute Organisms . 249 



34 Section of Beds of Iron-ore and 



Coal-measures, Forest of 

 Dean .... 267 



35 Coal-seams cut by a " Horse," 



Ruardean . , . 268 



36 Drift-bedding in Carboniferous 



Sandstone .... 269 



37 Plan of "Pillar and Stall" 



Workings . . . 278 



38 Rhynchonellee from Pi. XIIL, 

 Phillip's Geology of York- 





shire .... 



314 



39 



Section of Oyster -Deposits at 







Sunderidge 



328 



40 



Plan of Railway Works . 



341 



41 



Cross Section of Tunnel . 



341 



42 



Longitudinal Section of Railway 







Works 



342 



43 



Section of Strata, Dundonald 







Colliery . . . . 



354 



44 



Longitudinal Section of Cyrtina 







heteroclyta 



4L5 



45 



Diagram of Anticlinals and 







Synclinals 



428 



46 



Diagram of Fault . 



429 



47 



Spiral Lamellae of Athyris pec- 







tinifera . . . .. 



459 



LIST OF PLATES AND TABLES. 



PAGE 



I. Woodocrinus macrodactylus . . . . . . . .12 



II. Woodocrinus expansus 14 



III. Ammonites communis . . . . . . . . .112 



Table of British Rocks .120 



Table of Probable Equivalents of the Silurian andCambrianRocks . 138 

 ly. Hydreionocrinus ? globularis, H. Woodianus, H. Scoticus, Pisocrinus 



pilula, P. ornatus • . . . .148 



V. Panoramic View of North Wales from Cad er Idris . . . .169 



VL Remnants cf the First Dry Land, N. America 288 



VII. Oldhamia radiata, the oldest known Fossil. {To face Title). . . 240 



VIII. The Devil's Chapel, Forest of Dean 275 



IX. Rhynchonella acuta, and Rhynchonella cynocephala . . . . 3l6-f 

 X. Marbled Paper in Illustration of Ribboned-structure of Gneissic Rocks 364 



Index Map to Geological Survey 389 



XI. Plant from Coal-strata of South Wales 448 



XII. 'J'ypical It'orms of Brachiopoda, with Spiral Appendages for Oral Arms 472 



