8 P. A. Øyen. 



Laccolite-rocks (nordmarkite etc.) . . 63,56 



Dyke-rocks ' 3,96 



Brecciated augite-porphyrite 0,20 



Breccia, or fault-rock of Ekeberg . . 0,20 



Norite-rock of Jotunheimen 0,20 



To continue the study of this deposit would have been 

 highly interesting, in order to get a more extensive base on 

 which to form the calculation of the percentage of different 

 rocks, and to recover as many different types as possible. 

 But even the few facts, now obtained, are sufficient to show 

 some interesting phenomena as to the composition of glacial 

 frontal deposits, and to throw some light upon lines of glacial 

 movement at the very time of deposition of this moraine. 



In spite of Archæan gneissic rocks being the only con- 

 stituent of the superficial part of the earth^s crust all around 

 in this region, we yet see that blocks and stones belonging 

 to this type of rock only make one seventh of the whole 

 number. And we have a strong reason to believe, that even 

 out of that number, only a very scant minority may be 

 regarded as derived from the rocks of the very next neigh- 

 bourhood. For in the gravel we find specimens of those schis- 

 tose rocks to be mixed up Avith blocks and stones of an 

 igneous rock belonging to the very same period. But in 

 the immediate neighbourhood of Aas, we do not meet with 

 gneiss-granite as constituting part of the earth's crust. It 

 is not till we come some way to the north that we find this to 

 be the case, and here only for a very small part too, fully 

 corresponding with the scant percentage of specimens of 

 that rock in the gravel. And here we have a rather strong 

 proof, that the movement has not taken place in any south- 

 westerly direction, a deviation of only five to ten degrees 

 that way being able to bring within the territory of glacial 



