548 



MESSES. G. P. PRANKS AN"D J". B. HAERISON [Aug. 1 898, 



Y. CONCLTJSIONS. 



The preservation of the outlier on Bissex Hill is partly due to 

 the faults ^hich have let it down into a trough of the older rocks. 

 It can hardly he doubted that the marls once had a much greater 

 extension over what is known as the Scotland district, and the 



Fig. 3. — Comparative views of the succession on Bissex Hill and 



Mount Hillaby. 



Bissex Hill. 



MoFiTT Hillaby. 



Globigerina-maj:] , 



Unconformity. 



Siliceo- calcareous 

 earths. 



Siliceous radiolarian 

 earths. 



Chalky earths. 

 Unconformity. 



Scotland Beds. 



Yolcanic mudstones. 



Bed and yellow 

 clays. 



Upper chalks. 



Siliceo-calcareous 

 earths. 



Sihceoua radiolarian 

 earths. 



Calcareo-siliceous 

 earths and chalks. 



Unconformity. 



Scotland Beds. 



[Scale: 100 feet = 1 inch.] 



frequent occurrence of pehbles and large lumps of the foraminiferal 

 limestone in the alluvial gravels of the districts north and north- 

 west of Bissex Hill is some evidence of such former extension. 

 We should not he surprised if careful search disclosed the 



1 See Quart. Joum. Geol. Soc. vol. xlviii (1892) p. 210. 



