THE SOUTHERN PORTION OF THE WEALDEN AREA. 643 



deposit is its extension in a thin band from Lower Chancton Farm 

 past New Common copse to Lock's Farm, right at the base of 

 Chanctonbury Hill, thus forming a remarkable exception to the 



Fig. 6. — Section on Longbury Hill. 



3. Angular gravel, with seams of clayey sand. 

 2. Sand, with a few angular flints. 

 1. Lower Greensand. 



almost total absence of broken flints from the Gault and Upper 

 Greensand of the rest of the Aran basin *. 



The Aclur Basin. — Leaving the watershed at Longbury Hill, the 

 ground rises between Ashington and West Grinstead in a long ridge 

 to a height of nearly 150 feet at Hooklands and 180 feet at Windcave's 

 Farm. Thence there is a gradual fall to the level of the river at 

 West Grinstead. The whole of this ridge, consisting of Weald-clay, 

 is covered thickly with whole and broken flints, intermingled with 

 a few small fragments of ironstone. The boundaries of this bed of 

 drift are very clearly defined on the north-west by the small stream 

 running past Benton's Place and New Barn, and on the south-east 

 by a line running from Hook Farm to Clothall's Farm. This ridge 

 is separated by a deep valley from the high ground at Ashurst, 

 which reaches an elevation of 83 feet near Pepper's Farm. Here 

 also a coating of angular flints is seen upon the surface of the 

 Weald Clay and Lower Greensand, and several small sections occur, 

 showing 1-2 feet of gravel. The flints are occasionally cemented 

 into a dark ferruginous breccia. As at West Grinstead, the drift 

 extends right down to the margin of the river. The banks also of 

 the small stream running past Honey Bridge have a narrow fringe 

 of gravel, extending in places up to the 50 feet contour. Following 

 up the course of the Adur towards its source flints occur again 

 to a slight extent near Shipley, but after passing Coolham their 

 occurrence is extremely rare. 



Undoubted river-gravels of the Adur occur at several places on 

 the right bank of the river between Bineham Bridge and Bramber. 

 At Heath Barn, near Horsebridge Common, they cover the 50 feet 

 contour, but around Wickham Farm they reach the height of 95 feet. 

 A thick coating of flints is seen again on the opposite side of the 

 river at Streatham, but at no great height above the stream. Nearer 

 Steyning the railway-cutting exposes about 3 feet of gravel at a 



* This does not apply to the Gault near the banks of the Arun, which, at 

 Wiggonholt, Hardham, and Timberley, is covered with river -gravel, as previ- 

 ously described. 



