218 GUERNSEY CLAYS. 



On the other hand, a peaty formation overlies hardened beds 

 of clay at the Guet, Cobo ; and at Fort Doyle common, on the 

 east side, there is a peaty-clay earth of dark colour and 

 hardened, containing numerous pebbles of local stone and 

 flint, lying above a hard yellow clay, the upper part of which 

 is free from stones, but in the lower part are angular pieces of 

 Guernsey blue stone, and a few pebbles from the same. 



The following description of the Continental Loss is so 

 perfectly applicable to our Guernsey clay that I cannot help 

 adding it ; — Geikies Prehistoric Europe, pp. 144-5 : The Loss 

 very often contains concretions or nodules of irregular form ; 

 it is not always an unstratified mass .... lines of bedding 

 .... may be traced ; intercalated layers and laminse of sand 

 make their appearance. In some regions it loses its carbonate 

 of lime, becomes more argillaceous and passes into plastic 

 clay ; or it may graduate into loam. . . . The only character 

 which all these deposits have in common is their extremely 

 fine texture. P. 146 : It must not be supposed that the Loss 

 is restricted to valleys ; extensive accumulations may be fol- 

 lowed .... over the neighbouring plateaus. P. 152 : In the 

 north of France it frequently becomes more or less argillaceous, 

 and even passes into a regular brick-earth. 



