Ch. XXL] 



THE COOMR, 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 cli/-hilh 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. 



