1913] THE QUATERNARY SECTION OF FOSS 5 



The bottom of this tank (section A) was formed by 

 scratched rock covered with a layer of a reddish-grey gravel, the 

 coarse and washed character of which indicating its true fluvio- 

 glacial origin; the thickness of this layer reached three deci- 

 metres. 



On the top of this layer we find another one representing a 

 somewhat different character consisting as it does of very coarse 

 gravel forming a slightly assorted material of a grey colour with 

 a faint dash of red. The character of this layer that has a 

 thickness of about two decimetres indicates that the glacier had 

 in the mean time somewhat increased so as to have caused the 

 deposition of this morainic matter with stones only slightly in 

 fluenced by running water. 



This true glacial material is overlapped with thin alternating 

 layers of clay and sand to the thickness of about one decimetre. 

 The clay is very tough and mixed with gravel ; it has a bluish- 

 grey colour and occurs in thin layers that have a thickness of 

 only about one millimetre. The clay-layers are separated by 

 layers of fine sand of a red or yellowish-brown colour and thin 

 as paper. This clay-deposit gives a strong reaction to HC1. No 

 fossils were found in this deposit. 



Overlying this last mentioned series we find a tough and 

 fine-grained clay of bluish-grey colour. This clay-deposit is also 

 built up from rather thin layers of a thickness of about half a 

 centimetre rising to three or four centimetres intercalated with 

 very thin layers of reddish-grey gravel or fine, grey sand. This 

 clay gives a rather strong reaction to HG1. The following fossils 

 were found, more especially in a layer lying about half a meter 

 above the lower limit, — 



Anomia squamula Lin. 



Nucula tennis Mont. var. expansa was rather common if 

 only occurring in a small variety. 



Axinus sp. was not rare if only occurring in broken spe- 

 cimens that made one be reminded of A. gouldii Phil. even if 

 some of them might rather be referred to A. flexuosus Mont. 



