1913] SOME CLAY DEPOS1TS IN THE S.-E. PART OF NORWAY 25 



Portlandia lenticula Møll. forma typica and in some 

 places a small and short, rather high and thick variety. This 

 smaller variety has a length of 4.5 mm. and does as a rule 

 appear in such places in which we find intercalated portions of a 

 sandy clay of yellowish-grey colour. Specimens of forma typica 

 attain a length of 5 mm. 



No reaction to HGI is to be detected in any of these layers. 



As an uppermost layer covering the whole of the clay deposit 

 we find one of quite another character. This layer is built up 

 of very fine sand of a yellowish-grey colour or in some places 

 a similarly coloured compound of fine sand and clay. This 

 material gives a strong reaction to HGI. Even in this layer we 

 may sometimes, however, meet with rather small specimens of 

 the ovate-shaped type of 



Portlandia lenticula Møll. 



The characteristic fossils of this layer is, however, 

 Mytilus edulis L. and 

 Balanus crenatus Brug., Dar w. 

 which both of them occurred rather profusely even if only rela- 

 tively small specimens were to be discovered. Besides the species 

 just mentioned we in the same layer also meet with some 

 scattered specimens of 



Macoma calcaria Chemn. Length 14 mm. and 

 Saxicava pholadis L. juv. 



Having now followed the fossil-bearing deposits and even 

 traced the different faunistic series quite within the boundaries 

 of the moraines of the Aas-stage itself we might naturally look 

 for a correlation of the different strata. It is, however, difficult 

 to identify layers of gravel, sand, and clay in such a way that 

 no room is left to oppositional views. Only the uniform topo- 

 graphy and the regular stratification may render some proofs as 

 to the probable sequence of layers. Were it not for the fossils, 

 however, no real certainty might be attained to even in that 

 case. Then it is just a great satisfaction to us that not only 

 are fossils to be found throughout the whole series of layers 



