69 



great part of the slate found in the samples was derived from 

 icebergs which came from the north though some part of it 

 may have originated from rocks at the bottom of the sea. 

 Nor is the possibility excluded that greater masses of tertiary 

 existed formerly and were eroded during the ice-age, but these 

 rocks should , as shown above , be found only in the very 

 outermost samples. 



The basalt is found solid near most of the samples, and 

 its presence is very easily accounted for, as it may either 

 have originated from coast-ice or from rocks at the bottom of 

 the sea. 



The first three deposits occupy a peculiar position as 

 compared with the rest in as much as they are situated on, or 

 in the immediate neighbourhood of the moraine which must 

 exist at the bottom of the sea. We have already seen that 

 they contain, in consequence of this, a larger amount of frag- 

 ments than the deposits found further inland. It has also been 

 already mentioned that they contain much more granite than 

 the majority of the other samples, namely altogether 14 frag- 

 ments out of 26. Of the other 12. 10 are sediments, and only 

 2 basalt, which circumstance is rather difficult to explain, as 

 the basalt occupies a far larger area of the inland country than 

 is composed of the sedimentary formations. It is possible, 

 however, that much greater quantities of the latter existed 

 formerly, but were eroded during the ice-age. Of the 10 sedi- 

 ments, 4 are quartzite or hard sandstone derived probably 

 from the Silurian and the Devonian formations which must 

 extend towards the north inside С lave ring 0. Three, are 

 loose sandstones probably derived from the Jurassic, and 3 

 are clay-slates from the tertiary formation, thus all the solid 

 formations from inland are represented in the fragments of 

 the three samples, which fact is well in accordance with their 

 having originated from the moraine. 



