﻿686 SUMMARY OF THE CONTENTS. 



the Kristiania region, especially cardium ciliatuni, Fabr. and 

 aphrodite [serripes] grønlandica, Chemn. 



Pp. 131—152. C. The Retreat of the lee Border from the 



Ra-Station to the Series of Terminal Moraines, Svelvik — 



As (the inner ra). The Middle Area Clay, etc. 



The deposition of the ra indicates a long period during 

 which the iceborder must have remained in about the same 

 position. After this intermission. a change in the velocity of 

 melting must have set in, and the land-ice must have receeded 

 proportionaily very rapidly to the next great stage of repose, 

 the series of enormous terminal moraines, which may be desig- 

 nated as the inner ra-stage — at the distance of about 20—25 

 km. from the ouler ra. 



The Svelvik moraine is one of the biggest moraines of the 

 series of terminal moraines forming the inner ra-stage. A 

 description of this moraine is given on pp. 131 — 141. From the 

 study of the volume of the moraine, and its content of rocks 

 from the granitite-territory of the Dranmien region behind it, 

 compared with the area of this granite-territory, the conclusion 

 is derived, that the great difference in the depth of the outer 

 and of the inner basin of the Drammen Fjord on both sides of 

 the moraine (see the map, p. 133) must be explained by a shoa- 

 ling up of the outer basin by a deposition of sand and silt in 

 front of the ridge, not by the excavation of the inner fjord-basin 

 by the glacier, during the stay of the ice-border behind the ridge. 



The building-up of the outer as well as of the inner ra by 

 stratified sand and gravels (see the figures, pp. 135, 136) up to 

 at least 150 m. above sea-level, proves that these series of 

 moraines have been deposited helow sea-level. 



Between the two moraine-stages of the outer and the inner 

 ra, there are great areas covered by thick strata of clay depo- 

 sited immediately on the scratched floor, and thus the oldest 

 marine strata of this area. These clay-beds are very thick; a 

 number of localities are described on pp. 141—149. The fauna 



