ANTARCTIC ADVENTURE AND RESEARCH 



elsewhere there is another type of rock-residual which 

 has been very markedly smoothed off by overriding ice 



Fig. 17. — Block diagrams illustrating the "palimp- 

 sest theory" of glacier erosion applied to the Royal 



Society Range. 



In the upper figure the pre-glacial topography is suggested ; in 

 the central figure the advancing hemicycle with much cirque-ero- 

 sion by headward recession ; in the lower figure the period of 

 ice-flood when the outlet glaciers were at their maximum. (K. F. T. 

 indicate Koettlitz, Ferrar and Taylor glaciers.) 



which has since retreated. IMy Norwegian colleague, 

 Gran, suggested the Icelandic term nmiakol (lonely 

 rounded ridge) as suitable for this land-form, which 



128 



