62 
PLASTIC CLAY. 
At Chimting Castle, about a half mile to the 
east of Seaford, the upper part of the cliffs is 
composed of a bed of sand, about fifty feet thick. 
Here a stratum of the ferruginous breccia, pre- 
viously mentioned, is seen in situ, lying beneath 
the sand, and immediately upon the chalk. The 
sand is of a fawn-colour, passing into olive green ; 
it contains numerous irregular veins, and concre- 
tions of mammillated ironstone. The pudding- 
stone, or breccia, is precisely similar to that of 
Castle Hill, with which, there can be no doubt, it 
was once continuous. The flints that compose it 
present the same characters ; some being rolled, 
others angular, and all of them either of a dark 
green or yellow colour externally. The bed of 
breccia, in some places, is nearly four feet 
thick ; from this stratum the blocks distributed 
through the diluvial deposits were, no doubt, de- 
rived. The strata above named extend eastward 
about half a mile, and disappear near the Signal 
House ; they dip to the west at an an&’le of from 
10° to 20°. 
Eastward of this place, the chalk has only a 
covering of ochraceous clay, and vegetable mould, 
and, with the exception of the blocks of breccia 
at Brighton, &c., previously alluded to, and a few 
insular patches of olive green sand in hollows of 
the chalk at Piddinghoe, I am not aware of the 
existence of any other decided examples of the 
Plastic clay in the south-eastern part of Sussex. 
In the western division of the county. Professor 
Buckland observed a red variety of Plastic clay, in 
a small valley, at the village of Binstead, three 
