GL. 1(7.1 L GEOLOG 1 ' OF NOR TH GREENLANJ) 



795 



glaciers. The edge of the icc-ca[) a few miles west of the upper 

 end of Hubbard glacier showed the phenomena here referred 

 to in simple form. Here the layers of ice at the edge of the 

 ice-cap were upturned sharply. Between them, or between some 



Fig. 25. — A ridge of superficial debris accumulated on the surface of the ice 

 where an upturned layer reaches the surface. Edge of main ice-cap west of Hubbard 

 glacier, Inglefield Gulf. 



of them, there was debris, usually small in amount. The lines 

 of outcrop of the debris-bearing zones were clearly marked on 

 the surface of the ice-cap by nearly continuous lines of debris 

 (Fig. 26). These lines were very unequal. The amount of 

 drift coming up was much greater at some points than at 

 others, and here the drift on the surface was piled up into very 

 considerable mounds. Fig. 27 represents one of these mounds, 

 something like thirty feet high, but it is probable that some 

 portion of this ele\'ation is due to a core of ice which is pro- 

 tected from melting by the drift which caps it. 



Further west, and but a few miles east of Gable glacier, 



