THE DRYGALSKI ICE TONGUE 53 



southern margin of the Barrier at this point are filled with sea water. The con- 

 vexly-shaped lids of the crevasses, met with on its northern side at about 

 2 miles back from the margin, suggest also that the fact of their being in relief is 



Glacier Ice 



Possible tidal crach 

 ,\>* Sea water 



sea leven . 



Bank or 

 hard snow 



Surface of sea ice 



Crevasse Creyasse Crevasse 

 (Base of Glacier riot shonnt 



Fig. 10 



due to sea water filling the crevasses at a depth, and constantly giving oiF vapour, 

 which is built up in the form of arched girders across the tops of the crevasses. No 

 trace of moss ice, nor of arched crevasse lids, was observed by us in the central part 

 of the Drygalski Barrier. Diagrammatically the section appears to have been as 

 follows : — 



Moss ice over A rched lids oyer 



litis of crevasses ^, jo m/e^ ^ tfie crey asses 



; In this area the crevasses have 



sea level 



SOUTH 



flat hds. mostly countersunk •^^'mjgt' ^^^'^^ ^"'^^ 



Sea leyal 



NORTH 



Marine mud f jottom'^' 

 TRUE SCALE 



Fig. 11 



It is, therefore, highly probable that there is actually sea water under the 



Drygalski Barrier on our line of march for 2 miles inwards from either margin. 



As far as the evidence of the structure of the lids of the crevasses go there is no 



evidence that there is sea water under the central 10 miles of the Drygalski Ice 



II 



