THE S0UTHEEN POETION OE THE WEALDEN AREA. 



641 



laminated. On Hurston Warren the same gravel is seen in frequent 

 sections, covering the small plateau between the two streams to a 

 height of 50 feet. These gravels contain angular and subangular 

 flints and ironstone, but no chert. It is in these valley- and terrace- 

 gravels that mammalian remains have been found in several localities, 

 as at Burton Park, Fittleworth, Wiggonholt, and Peppering ; and 

 Murchison states that these remains only occur where the drift is 

 protected from percolation by a capping of loam or clay. 



But in addition to these gravels of undoubted river-origin, there 

 are other deposits which do not appear directly connected with the 

 present river-system. Prom Petersfield to West Heath, and thence 

 to Rogate, Trotton, and Midhurst Commons, extensive beds of angu- 

 lar flint-drift, often mingled with ironstone fragments and chert, 

 rise in places to 500 feet above sea-level and 300 feet above the 

 present drainage-level. West of the Arun these beds of angular 

 drift are most abundant between the Rother and the Chalk escarn- 



M. 



ment, but they do not usually occur either on the Upper Greensand 

 or Gault. The higher grounds, also, near the summit of the Lower 

 Greensand escarpment are quite free from flints. Murchison has 

 described these beds so fully that nothing need be added here con- 

 cerning them *. East of the Arun, however, upon or near the 

 watershed between the Arun and Adur rivers, similar beds occur, 

 and these will now be described in detail. 



Near Storrington, on approaching the summit of the hill known 

 as Sullington Common, angular flints become plentiful, and several 

 small pits have been opened in a true gravel-deposit of variable 

 thickness, and extending in patches as far as Clayton on the west 

 and Wantley on the north. The deposit is thickest on the highest 



Fig. 4. — Section on Sullington Common. 



S AWSQtf./ c, 



3. Black sand, with bleached flints. 

 2. Sand, with a few flints. 

 1. Angular gravel. 



contours of the Lower Greensand, which reach the height of more 

 than 200 feet in this district. A pit near the Washington road shows 

 from 1 to 5 feet of sandy gravel, the upper part bleached, the lower 

 part ferruginous. The flints vary from a diameter of four inches to 

 the smallest fragments, some of which are so angular and fresh that 

 their edges cut like a knife. Ironstone occurs sparingly, but chert 

 is apparently absent ; below the gravel is found sand, with a few 

 flints here and there. Scarcely any traces of stratification can be 



* Quart. Journ. Greol. Soc. vol. vii. p. 349. 



