1913] SOME CLAY DEPOSITS IN THE S.-E. PART OF NORWAY 23 



layer of the clay was of a grey colour and of a decomposed appear- 

 ance. Neither in this nor in the underlying layer could any 

 reaction of HO be observed. This underlying clay-layer was 

 composed of a fine and rather solid material of yellowish-grey 

 colour but it was only in the lower part of this layer that I 

 succeeded in detecting any fossils, viz. — 



Area pectunculoides Sc. and Antalls striolata Stimps. 

 seemed to appear in a somewhat higher level than the other 

 ones. Area meassured a length of 7 mm. and a height of 5 mm. 



Lower down an intermediate layer proved to contain the 

 following species: — 



Leda pernula Mull. Length 13 mm. 

 Portlandia lenticula Møll. Length 6 mm. 

 Area glacialis Gray forma typiea. 

 Abra longicallis Sc. 

 Below the yellowish-grey clay we meet with a fine and 

 rather soft clay of bluish-grey colour giving in some scattered 

 places a slight reaction to HG1. This clay was rather rich in 

 fossils mostly occurring only in casts as in the upper layers. The 

 following species were collected in this underlying clay deposit: — 

 Nucula tennis Mont. Length 8 mm. 

 Yoldia hyperborea Lov. was rather common in fine casts 

 and well preserved epidermis of quite the same type as that 

 described from Horten and Rakkestad. Length of the specimens 

 25 mm. or even in exceptional cases nearly 30 mm. 



Leda pernula Mull. forma typiea Length 20 mm. 

 Portlandia lenticula Møll. Length 5 mm. 

 Abra longicallis Sc. 



In order to obtain some more material for comparison we are 

 also to call attention to the section of the river of Holsbækken 

 situated some seven kilometres and a half to the east-southeast. 

 This section I described on a former occasion (Christiania Vid- 

 Selsk. Skr. I. Mathm.-Naturvid. Kl. 1908, Nr. 2, p. 40) and the 

 following fossils were found: — 



Portlandia lenticula Møll. 



Abra longicallis Sc. 



Balanus crenatus Brug. Darw. 



