1913] SOME CLAY DEPOSITS IN THE S.-E. PART OF NORWAY 7 



product from the action of sea-waves upon the slopes of the 

 ra-moraine at a time when the shore-line was lying at a level 

 of about 45 — 47 metres above the present sea-Ievel. The fossils 

 of this sand deposit also hint to quite another geological age 

 than those of the undertving clay; for, indeed, at the height of 

 about 45 m. a. s. I succeeded in adding broken specimens of 

 Ostrea edulis L. to the species already mentioned by Sårs, viz. 

 Mytilus edulis L., Cardium edule L., Mya truncata L., and 

 Littorina littorea L. Occasionally also broken shells of fresh- 

 water mollusca are met with but we are, no doubt, justified in 

 regarding them only as secondary occurrences. 



The most important division of this section is the lower 

 one crowded with arctic or glacial fossils. It is also highly 

 interesting that no disturbance could be detected in this portion 

 of the clay deposit. We are, of course, justified in regarding 

 this fossil-bearing clay as resting in primary situation. The 

 fossil species found in this clay were as follows : — 



Portlandia arctica Gray var. siliqua occurred rather 

 abundantly measuring up to 22.5 mm. It would, however, be 

 rather erroneous to assume that size of this species to be a typical 

 one for this locality. The tabulated list following will render a 

 clear representation of this fact: — 



Size Number Percentage 



5 — 10 mm. 



1 



0.3 



10-15 „ 



189 



50.4 



15-20 „ 



153 



40.8 



20—21 „ 



29 



7.7 



21—22 „ 



2 



0.5 



22.5 „ 



1 



0.3 



The external shape of the shell will be somewhat elucidated 

 by a couple of meassurements: — 



Length 19 mm. Height 14 mm. Relative index 0.737 

 — 18 „ — 14 „ — — 0.778 



