56 GLACIOLOGY 



by upthrust marine sediments. In one place on this same moraine we observed 

 a very large and delicate compound siliceous sponge firmly attached by growth 

 to a granite boulder. (See figure in Chapter on Raised Beaches.) 



These muds, which are probably of the nature of upthrust marine muds, are 

 described in detail in the Chapter on Raised Beaches. The structure of the piedmont 

 between the Drygalski-Larsen and the Reeves Glaciers has been described in detail, 

 as it is of great import in the glaciology of this interesting region, and is the key 

 to the mystery of the Ross Barrier, as will appear later.* When ascending Back- 

 stairs Passage we observed two considerable moraines sweeping out from the shore 



Dr>galski 

 Ice Barrier 



Relier 

 Inlet 



Shear ptones 

 Ice Uunga Old 



moraine 



A 



neeves 

 Glacier 



B 



Enlarged Section of above 



Ice 

 Donga 



Disjunctive planes 

 in part due to thrust 



: Old moraine 

 on glacier ire 



B 



Reeves Glacier 



Fig. 13. SECTION ACROSS THE DRYGALSKI PIEDMONT, AFLOAT FOR 



A GREAT PART 



at the foot of the Reeves Glacier seawards. In travelling from the Drygalski 

 Glacier around the ice clifi" of Terra Nova Bay to Evans Coves, one of our col- 

 leagues on the Nimrod took a photograph of the ice clifi" with dirt bands embedded 

 in it (Plate XII. Fig. 4). 



While much still remains in doubt, a section may be drawn provisionally from 

 the farthest point of our route up the Reeves Glacier to the Drygalski Barrier 

 at Relief Inlet, and thence to the point where we first reached the southern side of 

 the Barrier (Fig. 13). 



* A summary of the Drygalski and Reeves Piedmont will be given when the rest of the evidence 

 supplied by its feeding glaciers has been stated. 



