A glacial deposit near Christiania. H 



a deviation of glacial movement to the south-east, but the 

 angle of deviation does not exceed in that direction, what 

 was previously found to be the maximum of deviation in a 

 south-westerly direction. The rather small percentage of dyke- 

 rocks is in good harmony with the occurrence of dykes, but 

 we are not here to call for any special attention as to the 

 fact, that one specimen out of twenty-five ones is that of a 

 dyke-rock. 



The single specimen of the brecciated augite-porphyrite 

 of the region of the Lake of Alunsjøen indicates a removal 

 following nearly the true north-south line, the deviation not 

 being greater than if this phenomenon might have been due to 

 a dispersion on account of frontal spreading. It is also pos- 

 sible that some deviation for the basin of Christiania has 

 taken place along the hill-side of Ekeberg, continued by a 

 removal due south by a glacier- current taking the way of 

 the Bundefjord. For as we have already seen, a rather great 

 transportation of rocks from the region of the Lake of 

 Alunsjøen has gone on in a southern direction. But yet, we 

 are to add a couple of highly interesting instances, affirming 

 the fact, already mentioned. Near the bridge of Vollebæk, 

 in the same place, in which were also found some blocks of 

 camptonite, I noticed some erratics of the characteristic, reddish- 

 coloured tuffs and agglomerate of the region of the Lake of 

 Alunsjøen. In the same place, I also observed one single block 

 of grorudite, typical in grain and colour, such as that rock 

 is to be found in the dykes between Grorud and Stenbro- 

 vand. Afterwards, I also found specimens of grorudite in 

 one of the gravel-pits near Frydenhaug. 



The breccia or fault-rock of Ekeberg, of which rock 

 one single specimen was found in the gravel, also indicates 

 a glacial movement due south. 



