784 



THE JOURNAL OF GEOLOGY. 



are sufficient evidence that its surface slopes in a direction oppo- 

 site to the movement of the ice. An instance will be given 

 later, in the Inglefield Gulf region, where very considerable sur- 

 face streams were found flowing directly opposite to the motion of 

 the ice. 



As in the preceding case, almost no drift occurs upon the 

 surface of the glacier except where there are medial moraines. 



.,--■■.'*?; 



Fig. 12. View of a portion of the middle Blase Dale glacier showing the 

 undulation of its surface involving a backward inclination. 



The material from which the terminal moraine is built is derived 

 from the base or basal layers of the glacier. The elevation of 

 the end of the gracier is approximately 1600 feet above the sea. 

 Upper Blase Dale Glacier. — Without either descending to the 

 bottom of Blase Dale or climbing over the heights, it is pos- 

 sible to pass up the valley to the next glacier by taking advantage 

 of a terrace shelf that passes along the face of the cliffs. 

 Beyond it connects with a much more considerable terrace which 



