﻿SUMMARY OF THE CONTENTS. 691 



At the beginning of the melting of the ice-sheet, the land 

 commenced to sink. Hovv great the amount of the whole sin- 

 king of the land has been since the maximum of the ice-covering 

 during the time of the last ice-sheet, it is not possible to decide, 

 althoiigh it is probable, that the part of the sinking, which we can 

 certainly verify (the sinking from the beginning of the ra-time 

 to the end of the epiglacial time) is only the smaller half of the 

 whole sinking since the maximum of the last ice-covering. Per- 

 haps the ra-time was coincident with the middle part of the 

 sinking period. 



A short time before the ra-station of the ice-border, the 

 land bad about the same position in relation to the sea-level as 

 it has at present. During the deposition of the ra, then, the 

 land sank (at Moss, Horten, etc.) to the level of about 100 — 125 

 m. lower than it is at present; and in front of the ra at the 

 same time during the sinking was deposited first the older 

 yoldia clay, then upon that the younger yoldia clay, and 

 finally t/^e older area clay. Now the ice-border receded to the 

 next station, the inner ra, and in front of this the middle area 

 clay (and the older portlandia clay) was deposited. During the 

 time of the deposition of the outer series of moraines of this 

 inner ra, the land sank (at As) to about 150 — 160 (?) m., then 

 between the outer and inner series of moraines of this stage to 

 about 165 — 175(?) m. (at Holstad), and finally, before the moraines 

 of the inner series (at Hougen) to about 180 — 185 (?) m. 



Again the ice-border receded to the third great moraine- 

 series (Kristiania valley) and thereby sank further to about 200 

 m. (at Kristiania); before these moraines were deposited the 

 strata of the younger area clay (and the younger portlandia clay). 

 Finally, the land sank still more during the recession of the ice- 

 border to the moraine-series of the epiglacial station. During 

 this epiglacial time the sinking of the land ceased; the land 

 then south of Mjøsen (at Houersæter) bad sunk to about 240 (?) 

 m. Now the upHft began. 



As early as during the outer ra time, the higher parts of 

 Central Norway were probably free from ice, so that the highest 



