﻿702 SUMMARY OF THE CONTENTS. 



A. The Upper Clay-beds and Shell-banks, younger 

 than the Mya-banks. 



Pp. 355 — 359. 1. The Uppermost Clay-beds in the Kristiania 

 Valley, younger than the Mya-time. 



In the Kristiania Valley, a series of clay-oceurrences show 

 how the immigration of southern mollusca has continued after the 

 deposition of the beds of cardium clay at Grorud, The fauna 

 of the clay at Bryn, not far from Kristiania, is mentioned on 

 pp. 356, 357. This clay — a younger cardiumclay — pro- 

 bably corresponds to 50 ^/oo of the uplift. 



Pp. 359—381. 2. The Uppermost Ostræa-banks. 



A number of shell-banks corresponding to 60 — 67 %o of the 



total uplift are described on pp. 359 — 376; a table of the occur- 



rences of this kind known (11) is given on p. 377. The fauna 



of these uppermost ostræa-hanks is summed up in the table on 



pp. 378 — 380. The table comprises 77 species of shell-bearing 



2 .6 3 . . 



mollusca, of which about tt are arctic, tt boreal and tt lusitanic 



11 11 11 



species. 



On pp. 361 — 364, the question of the first appearance of the 

 oyster [ostræa edulis) in the deposits of the Kristiania region is 

 discussed. 



Pp. 382 — 384 contain a table on the mollusc fauna 



that have lived in the Kristiania Fjord at the time when 



the land bad risen to a level corresponding to about ^/s of the 



total uplift. This table comprises nearly a hundred (93) species, 



of v^^hich 17 are arctic, 45 boreal, and 31 lusitanic, or in the 



f 2 , 5 , . 4 , 



proporhon ]j;a-+Jjb:— jjl. 



This scheme thus shows a great difference from the fauna 

 of the mya-banks. The arctic forms are already proportionally 



