Wealden District and the Bus Boulonnais. 



15 



These circumstances combined afford strong evidence ot" the valley in question 

 having originated in a transverse fissure. 



I shall now proceed to the western and south-western parts of the district. 



I have already described the general horizontality of the beds near Horsham, 

 and the consequent absence of any determinate anticUnal line. Still the general 

 configuration of the district shows distinctly the continuation of the anticlinal eleva- 

 tion. The greensand of Hind Head for instance is much higher than the same beds 

 at those points north and south of that hill where they pass under the chalk escarp- 

 ments ; but this greater elevation being principally acquired soon after emergence 

 from beneath the chalk, the central portion is left nearly horizontal. This relative 

 elevation is also in great measure lost still further to the west by the gradual west- 

 ward declination of the beds ; and therefore, when we arrive at the chalk on the west 

 of the general denudation, it becomes still more diflicult to assign any determinate 

 position to a distinct anticlinal line. Mr. Martin however appears to have recog- 

 nized, in an east and west valley near Haslemere, some evidence of its continuance 

 along that valley, a position which very well accords with the general elevation, 

 and also with the westerly prolongation of the Hastings sands. 



Greenhurst Anticlinal Line. — This line, running near and parallel to the South 

 Downs, is one of the most important geological features in the south-western por- 

 tion of the district. It has already been described in detail by Mr. Martin. The 

 evidence of this line, as pointed out to me by that gentleman, is perfectly clear 

 from the chalk at Piecomb on the east to Coldwaltham Park (south-west of Pul- 

 borough) on the west. It will be immediately recognized on the map. 



Pulborough Line of Flexure. — About two miles to the north of this line and 

 parallel to it, we recognize a well-marked line of flexure passing close above the 

 village of Pulborough. The annexed diagram represents the section from the 

 chalk escarpment to the Weald clay, in a direction nearly north and south, and 

 passing by Wiggonholt Common and Pulborough. 



4. Chalk and Upper Greensand. 

 3. Gault. 



2'. Lower Greensand, lower beds. 

 2. Lower Greensand, upper beds. 

 1. Weald Clay. 



The Greenhurst line meets the section at A, and the line of flexure at B. 

 This line of flexure does not extend far to the east of Pulborough. On the west 

 of that place it is well defined near Stopham and Fittleworth. 



