Ch. XXI.] 
THE COOMB, NEAR LEWES. 
301 
declivities on each side are covered with green turf, as is the 
bottom, which is perfectly dry. No outward signs of dis- 
turbance are visible, and the connexion of the hollow with 
subterranean movements would not have been suspected by the 
geologist, had not the evidence of great convulsions been clearly 
exposed in the escarpment of the valley of the Ouse, and in 
the numerous chalk pits worked at the termination of the 
No. 75. 
The Coomb, near Lewes. 
Coomb. By aid of these we discover that the ravine coincides 
precisely with a line of fault, on one side of which the chalk 
with flints a, appears at the summit of a hill, while it is thrown 
down to the bottom on the other. 
No. 76. 
Fault in the cliff-hills near Lewes, 
a, Chalk with flints. b, Lower chalk*. 
The fracture here alluded to is one of those which run east 
* I examined this spot in company with Mr. Mantell, to whom I am indebted 
for the above section. 
