320 



THE GEOLOGIST. 



the contrary, possesses an open and unobstructed view of some distance 

 around, and is then separated, by a slight depression, from the higher hills to 

 the southward. The pits are of considerable extent, and have been long 

 worked for brick-earth, sand, and gravel. The total thickness of all the beds, 

 which repose upon a very irregular and eroded surface of chalk, varies from 

 about twenty to thity feet. The worked flints are found chiefly in the lower 

 bed of gravel, more particularly in the lower part of it or near the chalk, where 

 also the greater number of bones are found, but this is by no means a general 

 rule. A considerable number of teeth and bones are also met with in the 

 sand and marl above the gravel. 



Fig. 5.— Section in a pit at St. Acheul, on the side nearest the Cagny road. 



Fig. Section in a pit at St. Acheul, on the side nearest the Cagny road. 



