(;/.. IC/.I I. GI-'A )LOGy OF NOR rif GREENLA ND 



'97 



is C()iiii)lctely concealed. Where this happens, the topography 

 of the suj^erficial drift reproduces, in all essential respects, the 

 topography of the rough terminal moraines of the United States. 

 Between adjacent hillocks or short ridges there are round, irreg- 

 ular, or elongate dej)ressions, with sides often as steep as the 



P'iG. 27. — Mound of debris on edge of ice-cap near Hubbard glacier. It repre- 

 sents an excepiional accumulation of debris at one point, along the line where an 

 upturning layer outcrops. 



material will lie. The swells between the depressions are cor- 

 respondingly abrupt. In its general contours, as well as in the 

 specific relations of the elements of its topography, the surface 

 drift of this locality is so like that of the terminal moraines of 

 the United States as to suggest that, in the phenomena shown on 

 the ice-cap at this and other points, is to be found the explana- 

 tion of at least a part of the roughness of topography which 

 characterizes terminal moraines in general. It is probably true 

 that if the ice within the area here mentioned were to melt, 

 depositing the drift on the surface beneath, its topography w^ould 

 be less rough than it is now, for it is probable that some consid- 

 erable part of the elevations which appear to be of drift is really 

 due to cores of concealed ice. 



