THE SOUTHERN PORTION OF THE WEALDEN AREA. 



645 



pierpoint. All these gravels agree in containing both angular and 

 subangular flints, very little ironstone, and no chert or Wealden 

 sandstone. 



We now come to the line of watershed between the Adur and the 

 Ouse, the elevated ridge running through Ditchling to Burgess Hill. 

 At the village of Keymer, half a mile from Ditchling, small traces of 

 flint-drift are to be seen near the Post Office ; but on ascending to 

 the summit of the water-parting at Lodge Hill, 278 feet above sea- 

 level, the fields are again strewn with an abundance of flints, which 

 become thickest near Oldland Windmill. This bed of gravel is 

 entirely confined to the summit of the watershed, and disappears 

 abruptly on descending below the 200 feet contour in any direction. 

 Following the line of watershed from Ditchling to Burgess Hill the 

 surface is at first depressed, and there is no sign of any drift ; but 

 the moment we ascend the higher ground at Burgess Hill small 

 sections of gravel, from 1 to 3 feet in thickness, again appear at about 

 200 feet elevation. The flints here are as angular as any observed 

 elsewhere, and they rest upon the Weald-clay. On the hill at 

 Inholmes Farm the clay has been extensively worked for bricks and 

 pottery, and on closely examining the sections numerous pockets of 

 gravel are seen, sometimes dipping from 2 to 3 feet into the clay and 

 then again thinning out and perhaps entirely disappearing. The 

 flints are very angular, no traces of stratification are here visible, 

 and there is very little admixture of ironstone. The general 

 appearance of these remnants of angular gravel is represented in 

 the diagram (fig. 7). Again, at Oathill Farm the fields are thickly 



Fig. 7. — Section at Inholmes Farm. 



S AV/SoW.f c. 



1. Weald clay. 2. Gravel. 



strewn with angular flints to a height of 181 feet above the sea-level, 

 or 80 feet above the level of the river. From this point the gravel 

 descends to the river, and forms a well-marked bed along its left 

 bank, the right bank at Wivelsfield and Lunceshill being quite 

 free from any detritus, nor was any trace of this gravel found in 

 the lower grounds lying to the west of the line of railway. An 

 interesting feature of this gravel at Oathill is that it rests partly 

 upon the Hastings beds, and, unlike the gravel at Amy's Mill, near 

 Horsham, previously described, it consists almost entirety of angular 

 flints, with' only a very small admixture of Wealden fragments. 



Crossing now the valley between Burgess Hill and Ditchling 

 Common, the gravel reappears at the latter place on reaching an 

 altitude of from 170 to 200 feet, and at Ditchling Potteries several 

 sections are visible, showing from 1 to 5 feet of angular flint-gravel 



