IpIO.] 



INLAND-ICE OF THE ARCTIC REGIONS. 



95 



ing effect of obstructions in the bed, and by the shearing and over- 

 thrusting movements which are found to exist in inland-ice near 

 its margin^* (see Figs. 27 and 28). This process has much in 



Fig. 27. Diagram to show the efifect of a basal obstruction in the path 

 of the ice near its margin (after Chamberlin). 



common with that which we have already described in connection 

 with scape colks. 



Fliwio-glacial Deposits. — Where studied by Chamberlin near 

 Inglefield Gulf, there appears to be little or no gushing of water 

 from beneath the inland-ice. Small streamlets only appeared be- 



FiG. 28. Surface marginal moraine of the inland ice of Greenland. 



neath the ice border, bringing gravel and sand which they distri- 

 buted among the coarser morainic material. So far as land has 

 been recently uncovered by the ice in north Greenland, and so far 

 as differentiated from the topography of the underlying rock, it was 

 " Chamberlin, /. c, p. 92. 



