Vol. 51.] 



AND GRAVELS OF ABERDEENSHIRE. 



473 



those in the clay, found up to 470, and a scattered few of the same 

 kind up to 560 feet. On the assumption that the clay is a sub- 

 marine deposit, these pebbles are taken to indicate the limit of the 

 submergence, which is thus currently stated to have been about 

 560 feet. Nevertheless, we think it clearly appears, from Mr. 

 Jamieson's minute and faithful description of this clay, that it is as 

 truly a glacial deposit as the underlying gravels, to which reference 

 has already been made. 



Sketch-map showing the Movement of Ice along the N.E. coast 

 of Scotland. 



A rrowheads =Direction of 



glacier-movement. 



English. Miles 

 o 10 20 30 



B = Boulder Clay containing sea-shells. 

 C = Clava. K = King Edward. 



This clay, Mr. Jamieson remarked, ' is not such a deposit as 

 would be derived from the rocks of the district in which it occurs ' ; 

 it is quite unlike the grey Boulder Clay derived from the gneiss and 



