290 



ON SOME LACUSTEINE DEPOSITS 



sistent, but still hardly to be distinguished from the surround- 

 ing drift, and not continuing very far in a horizontal direction. 

 The following main lines of division were here made out : — 



Ordinary drift 8 feet. 



Clay of a white colour with small sandstone 



boulders ... ... ... ... ... o-i feet. 



Reddish clay with rather larger blocks of 



sandstone ... ... ... ... ... 3 inches. 



Yellowish clay with small bits of Magnesian 



Limestone (base not seen) ... ... 2-8 inches. 



To the west this section at once changes, its place being 

 taken by the ordinary drift, which thickens up to 15 feet, its 

 base not being visible. To the east the same thing happens, 

 but the drift here becomes gradually thinner. 



The remaining section is that visible on the south side of 

 this cutting (C), and here the most striking features are 

 developed. The section gradually thickens from 3 feet at its 

 eastern end to 16 feet at its western extremity, where the base 

 of the drift is seen lying on a Coal Measure sandstone. For 

 some distance along the exposure a band of pure white clay 

 of a uniform thickness of 3 feet (except near the centre, where 

 it contains an undulation) occupies the base of the section, 

 being continued for about fifty yards from east to west, when 

 it gradually sinks out of sight. 



Fig. 3. Section oji south side of south cutting ; sketch ex- 

 planatory of photograph of same section. 



1. White clay. 



2. Yellow sand. 



3. Ordinary drift. 



This white clay is very well developed, entirely devoid of 

 stratification, and contains no pebbles of any kind ; towards 



