S66 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 8, 



over a considerable tract on the road to Upsala, wiiich is covered 

 by osar, surmounted at intervals by the larger blocks, the whole 

 region is found admirably calculated to exhibit the results which 

 such drift has produced. Slightly covered over with angular blocks 

 and coarse detritus, usually on the south side of the hills, each pro- 

 montory is seen entirely cleared of wood; and in travelling through 

 this district I observed many hillocks, the northern faces of which 

 were invariably rounded, polished and scratched, but which assumed 

 different curvilinear forms, some being very nearly vertical, others 

 quite planed away into a gradual slope, and others again of inter- 

 mediate shapes, as represented in the annexed sketches. Of these 



Fig. 8. 



Fig. 11. 



diagrams fig. 8 exhibits a sloping rounded surface to the north and 

 a flattened summit covered at once by erratic angular blocks, some 

 of which are seen also at the ragged or southern scarped side, whilst 

 an OS of gravel and sand to the south of the hillock is partially sur- 

 mounted by angular erratics. Fig. 9 shows the northern face much 

 more abraded and flattened, and the surface of the summit to some 

 extent covered by the drift and also by the angular erratics. 



In the next diagram (fig. 10) the vertical 'bomber' northern face, 

 so common in the worn rocks of Sweden, and its southern scarp, are 

 followed by a very coarse os, whilst, as in fig. 11, some of the ridges 



