ICE SHEETS AND GLACIERS 



proximately at grade, and still supplies some ice to the 

 Ferrar Glacier just south of its snout. Its supply of 

 snow and ice occupies a saddle-hollow or large cirque 

 above the valley slope, down which it descends with 

 some crevasses and falls. It reaches the Ferrar Glacier 

 in a series of large ice steps. Apparently it is strong 

 enough to push the main glacier to one side for about 

 one hundred yards, and it here raises a series of low 



Fig. 20. — The Herbertson Glacier pressing into the 

 Ferrar Glacier on the left. 



Looking east from the hill slope. 



ridges in the main glacier. However, there are in- 

 dications that a permanent tide-crack or stream sepa- 

 rates the two, and it is in the arrangement of the pres- 

 sure-ridges that the chief interest lies. 



The snout of this small glacier is about one quarter 

 of a mile wide, and along its western side is a well- 

 marked silt-fan or delta. The lower portion of the 

 Herbertson Glacier was at an angle of 27° and it was 

 broken into steps each about twelve feet high. In the 



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