1913] SOME CLAY DEPOSITS IN THE S.-E. PART OF NORWAY 31 



Portlandia lenticula Mull. forma typica of length 5 mm. 

 was rather numerous and also occurred in the next clay-layer 

 upvvards. 



Axinopsis sp. orbiculata G. 0. Sårs. A somewhat broken 

 east was found to which I would have paid no special attention 

 if I had not been favoured by the good opportunity of a direct 

 and immediate comparison with a similar specimen from the 

 clay-deposit of the tile-work of Rakkestad. As well from a 

 biological point of a view as in regard to stratigraphical corre- 

 lation the occurrence of this species is, however, of great im- 

 portance. 



Balanus crenatus Brug., Darw. A fine east was found in 

 the upper clay-layer of nearly the same variety as I also found 

 in the shell-bank of Enger (Høland). As already mentioned an 

 upper clay-layer of a thickness of about one meter and a half 

 could be distinguished by its bluish-grey colour. The fine stratifi- 

 cation was not so prominent in this upper layer as in the lower 

 one. The whole of the just mentioned clay-deposit was covered 

 with a layer of grey colour and consisting of a very much 

 decomposed and sandy clay of the thickness of about half 

 a meter. 



As we proceed towards the northwest along the Lake of 

 Ørje we in Rødenæs on the east side of the Lake and opposite 

 to the church have a fair view of another terrace rising to a 

 higher level than that of the fossil-bearing one near the brick- 

 work of Ørje. This higher terrace proves to correspond with 

 that of the shell-bank of Skulerud and seems to be a gravel- 

 terrace of the very same kind as the last mentioned one. The 

 shell-bank of Skulerud and the terraces surrounding this locality 

 I described on a former occasion (Christiania Vid.-Selsk. Skr. I. 

 Mathm.-Naturvid. Kl. 1908, Nr. % pp. 12—17). On that occasion 

 the height of the shell-bank of Skulerud was measured to be 

 178 m. a. s. and the height of the corresponding shore-terrace 

 proved to be 181,5 m. a. s. This shell-bank of Skulerud I have 

 referred to the Mytilus-stage. In the surroundings of Skulerud, 

 however, we witness the appearance of at least two other 



