TT. Iviær. — TCvarhTRvtidciis marino atli'irhiy'ci' vfiT Troms«. 43 



Summary of the Contents. 



On the Posttertiary and Recent Marine Deposits 



in the Tromsø Region. 



Mollusca and Foraminifera. 



I. Tlie deposits of the late glacial times. Yoldia 

 clay and Area clay. The highest occurrences of shells from 

 the Tromsø region, 66 metres above the level of the sea. 



II. The postglacial deposits. Shellbanks at Tromsø. 

 Clay beds in the inner part of the Balsfiord. Occurrences 

 of fossil shells i the littoral region. 



III. Recent deposits. In calm bays and in the deep 

 water channels of the fiords are often found a great many 

 shells of species not known living on the muddy bottom. 

 They have on the other hand belonged to 1) shallow water 

 raollusca, 2) mollusca living on hard bottom), 3) species 

 not known living in the fiords near Tromsø in recent times. 

 Those shells have been washed out from low water by 

 the waves and by the strong current rushing through the 

 narrow courses of the fiords. This is also indicated by 

 the great quantities of sea-wrack fFiicits) with littoral ani- 

 mals, which are usually fished up in the trawl from the 

 deep water channels. The shells are also partly carried 

 away from the shore by icefiakes, being frozen to these 

 or by storm swept up on the same and later the shells 

 together with gravel and stones are sunk down from the 

 melting iceflakes upon different depths. 



Near Tromsø there are partly in the shellbanks 

 partly in the different depths of the fiords, shells of 

 some boreal and lusitanic mollusca, no more found Hving 

 at the place. They are on the other hand still living by 

 the outer coast of Norway as far north as Lofoten or 

 even the North Cape and Vadsø. That they have become 



