39 o SCIENCE PROGRESS 



will be published. In the meantime, a provisional account is 

 as follows : 



Base of the Gaiilt at 947 ft. 8 in. 



Thickness. Depth. 

 Lower Green sand (52 ft. 4 in.) 



2 ft. 4 in. Folkestone Beds 950 ft. 



33 „ Sandgate Beds 983 „ 



Hythe Beds absent 



17 „ Atherfield Clay 1000 ft. 



Wealden Series (35 ft.) 



6 ft. 6 in. Weald Clay 1006 ft. 6 in. 



28 „ 6 „ Hastings Beds 1035 „ 



Oolites (350 ft. 6 in.) 



54 ft. Corallian 1089 ft. 



128 „ Oxfordian 1217 „ 



43 „ ? Kelloway Rock and Cornbrash . . . 1260 „ 



91 „ 6 in. Bathonian 1351 „ 6 in. 



24 „ ? Lias 1375 » 6 » 



The Folkestone Beds (947 ft. 8 in. to 950 ft.). 



The Zone of Ammonites mammillatus is represented by 

 2 ft. 4 in. of a glauconitic phosphatic conglomerate, with pebbles 

 of Lydite and quartz, some rolled, some angular, up to h in. 

 diameter, some being highly polished ; there are also irregular 

 phosphatic nodules. There is a fragment of an Anthoceras .sp. 

 which is not A. mammillatus. This bed is undoubtedly identical 

 with the A. mammillatus Bed at the outcrop at Folkestone, and 

 of the Dover shafts. The characteristic hard concretions are 

 invariably met with in the borings in East Kent, and are 

 generally referred to as the " hard band," showing that, 

 though remarkably attenuated, this bed is very persistent. 



The Sandgate Beds (950 to 983 ft.). 



Immediately beneath we find 5 ft. of a glauconitic muddy 

 sand, a washing from the top of the Sandgate Beds. The 

 ground becoming firmer, we get a glauconitic mixture of clay 

 and sand, resembling the same ground in the Dover pits, down 

 to 967 ft., where it becomes more glauconitic and contains more 

 pebbles. At 968 to 969 ft. it has passed into a greensand with a 

 little clay. From 969 to 983 ft. we only have a sediment, which 

 probably represents the Pholas Band of the Dover section. 



Thus we have a total thickness of 35 ft. that can be safely 

 attributed to the Sandgate Beds. In the other borings these 

 beds are persistent, but more attenuated and very argillaceous. 



