Mr. Hopkins on the Structure of the 



Description of the preceding Sections. 



Of these sections the first (16) exhibits, near its southern extremity, the line 

 of flexure wliich Mr. Martin is disposed to consider as the continuation of the 

 Greenhurst anticUnal line. At its northern extremity it is intended, in conjunc- 

 tion with (17), to show the great change which takes place in the dip of the chalk 

 after we pass the western extremity of the Hog's Back, as mentioned in the descrip- 

 tion of this part of the district. Section 18, at its northern end, exhibits the 

 Weald clay just appearing at the surface in Peasemarsh, as described by Dr. Fitton 

 and Mr. Martin. The latter gentleman considers his Peasemarsh line as running 

 from thence through Crooksbury Hill. The southern end of this section exhibits the 

 Greenhurst line, with the patch of gault to the north of it, as well as the line of 

 flexure' which I have described as passing from Pulborough to Trotton Common. 

 Section 19 shows the manner in which the rapid dip is continued to the top of 

 Margaret's Chapel Hill, and, together with (20) and (21), shows the continuation 

 of the great line of flexure near the chalk escarpment of the North Downs. Section 

 20 also exhibits the Greenhurst anticlinal at the point where it brings up the 

 Weald clay in a valley of elevation. Section 2 1 exhibits the Crowborough and Cuck- 

 field anticlinals. Section 22, at its northern end, shows the Seven Oaks line, and at 

 its southern end the Lewes anticlinal, supposed to be a continuation of the Green- 

 hurst line. This section and (23) also exhibit the Bidborough and Brenchley line, 

 which is generally a line of flexure, but assumes the anticlinal arrangement at 

 Brenchley Hill. In the latter section we also recognise the Frant, Wadhurst and 

 Brightling lines. Section 24 exhibits the two distinct anticlinals through Battle 

 and St. John's Cross, into which the Brighthng appears to be divided to the east 

 of Brightling, Section 25 is perpendicular to the Battle and Bexhill lines, exhi- 

 biting the fault in the low sea-cliffs near Bexhill. 



In the lengths of these sections the scale of the Ordnance Map, one inch to the 

 mile, has been reduced to a^th of an inch to the mile. In the heights no topogra- 

 phical accuracy has been aimed at. The object has been to give a clear concep- 

 tion of the character of the phaenomena of elevation which the district presents. 



