4 P. A. ØYEN [No. 2 



sections on the right or western bank of the river were opened 

 on belialf of the foundation work for enlarging the spinning- 

 factories of Graah. The complicated character of these sections 

 and the unusual interest that proved to be connected with them 

 induced me to study the series of layers in this place more par- 

 ticularly. In the autumn and early part of the winter several 

 spare days were consequently spent in working out the strati- 

 graphieal record of the series at the same time as the work of 

 foundation proceeded. And, it was not till the second day after 

 Christmas that I could make the finishing excursion to this place. 



Silurian schists intersected with dykes of diabases form the 

 base of the sections. And, these base rocks proved to be all 

 over conspicuously ice-scratched in a very fine manner so as to 

 present not only the well-known roches moutonnées and 

 larger canals on a rough scale but also furrows of smaller di- 

 mensions, and every where we find the characteristic striae and 

 polishing that indicate the last and finishing work of glacier ice. 

 The direction of the movement of the glacier proves to have 

 been nearly parallel to that of the river. 



The foundation plain is on a level of 27.2 metres above sea, 

 or six decimetres lower than the floor af the factory. Quite near 

 to its south-western border a tank had been sunk to the depth 

 of about two metres and a half below this plain or 25 metres 

 above sea-level. 



A 



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D E 



SoclU 1 1000 



fou rvacL-txoiv ioclLL 



.. cortdvcit seta&f. ff' ta & 



