﻿SUMMARY OF tHE CONTENTS. 693 



II. The Late Glacial Shell-banks and Clay-beds 

 Deposited during the Rise of the Land. 



Pp. 210—217. The HIghest Occurrences of Shells from 

 the Kristiania Region. At Grefsen and Arvold, just below the 

 upper marine boundary at Kristiania (215 — 217 m. above the 

 sea) Mr. Øyen discovered a series of shell-oecurrences in littoral 

 beds of gravel and sand, 203 — 208 m. above sea-level. The 

 fauna comprises only a few species: mytilus edulis, Lin. macoma 

 haltica, Lin., mya truncata, Lin., saæicava pholadis, Lin. and 

 halanus crenatus, Brug. As mytilus edulis on high-arctic 

 shores is not a Httoral shell, this fauna proves, that at the time 

 of the deepest submergence of the land, the climate cannot have 

 been high arctic, hut only a boreo-arctic, very similar to the 

 present climate of Finmark. The shell-bearing beds were over- 

 laid by strata of gravel with great boulders in abundance. 



Pp. 218—352. The Mya-banks. 



a. The Upper Mya-banks; the Level Corresponding to — 25 ^/oo 

 of the Total Uplift. 



Pp. 120—244. 1. The Upper Mya-banks in the Southern 

 Part of Smålenene (southeast of Kristiania). 



The mya-banks of this part of the country are mostly 

 ordinary littoral shell-banks, deposited in very shallow water or 

 in the shore-line, and generally consisting almost exclusively, 

 or for a great part, of crumbled shells. Other occurrences are 

 more rich in clay, a sandy shell-clay, etc. 



The fauna of shell-bearing moUusca on these shell-banks 

 is given on pp. 238, 239; it comprises 23 species. Only 17 of 

 these are arctic, and 6 are boreal species, although some of 

 them in arctic varieties. One of the most characteristic species 

 is mya truncata, Lin. which in these upper banks in Smålenene 

 occurs only in the arctic variety tiddevallensis (see fig. 24, p. 



