LIST OF PLATES. 



N.B. In each map the horizontal blue lines represent the area which 

 is supposed to have been covered by the sea. 



PAGE 



PLATE I. Hypothetical Restoration of early Ordovician geo- 

 graphy (Arenig epoch) 36 



PLATE II. Hypothetical Restoration of Silurian geography (Llan- 



dovery or Valentian epoch) 46 



PLATE III. Supposed geography of Lower Devonian and Old 



Red Sandstone time 60 



PLATE IV. A Restoration of Lower Carboniferous geography 



(Lower Shale and Limestone epoch) .... 86 



PLATE V. Geography of the Permian or Dyassic period . . 106 



PLATE VI. Geography of the Triassic period (Keuper) . . 130 



PLATE VII. Geography of the Lias and Inferior Oolite . .150 



PLATE VIII. Geography of the Portlandiau epoch . . .160 



PLATE IX. Geography of the later part of the Vectian period 



(Aptien) 186 



PLATE X. Geography of the Upper Greensand epoch . . 190 



PLATE XI. Geography of the Lower Eocene (Thanet Beds and 



London Clay) . 222 



PLATE XII. Geography of Oligocene time .... 232 



PLATE XIII. Geography of later Pliocene time (the closer lines 

 representing the extent of the sea at the time of the Forest 

 Bed) 258 



PLATE XIV. Pleistocene geography, coast-line coinciding with 



contour of 80 fathoms 294 



PLATE XV. Pleistocene geography, coast-line coinciding with 



contour of 40 fattcms ..... 300 



