﻿696 SUMMARY OF THE CONTENTS. 



lusitanic. The mixture of the fauna is thus still boreo-artic, 

 although indicating a somewhat niilder chmate than the fauna 

 of the upper mya-banks of Smålenene. 



Pp. 274—281. 2. The Lower My a banks at Kristiania. 



A number of these banks corresponding to 27 — 42 °/oo of 

 uplift are enumerated on p. 275; the description of the single 

 occurences follows on pp. 275 — 278. The mollusc-fauna of these 

 banks comprises 26 species, of which only 9 are arctic, while 

 13 are boreal, and 4 lusitanic. — " The arctic forms are almost 

 exclusively such as are widespread down to southern degrees 

 of latitude. The boreal forms predominate; it is to be remarked 

 for instance, that a great form of littorina littorea and further 

 the typical form of huccinum undatum, etc. already occur; 

 some of the southern forms, such as cardium edtde, peden 

 tigrinus, are not known from East Finmark. Thus the fauna 

 of the lower mya-banks at Kristiania already indicates without 

 any doubt a boreal cliniate, very similar to the present climate 

 of Nordland. 



Pp. 282—288. The Oldest Cardium Clay in the Kristiania 



Valley. 



Corresponding with the mya-banks of the Kristiania Valley, 

 a series of occurrences of fossihferous clay-beds ai*e known. 



The more elevated of these clay beds, from the first part of 

 the rise and corresponding to about — 15^/oo of the total uplift 

 may be designated mytilus-cyprina-clay. 



Somewhat lower and younger, corresponding to about 15 — 

 40 ^/oo of uplift, there are other occurrences of clay, as e. g. the 

 clays at Grorud. These clays already contain a fauna with a 

 number of southern (lusitanic) species such as pholas candida, 

 cardium edule, c. echinatum, nucula micleus, etc. These 

 thus confirm the experience gained from the corresponding lower 



