TJII': GREAT riKDMONT GLAC]1:K 
427 
Glacier. The walls arc facetted, hut not much facetting 
is visible — for the Mackay would seem to be hlling its 
bed to a greater extent than the Ferrar or Taylor ghiciers. 
Traces of a high level plateau at 3000 Icet are evident 
all around Mt. Tryggve Gran, and the ice sheet drains 
thence into large tributary glaciers such as the Cleveland. 
The upland topography is of three types. There are 
mountains, such as Tryggve (Iran, whose shape is due to 
their stratigrapliy. This peak is ilat-topped owing to tJie 
presence of a dolcrite capping. Others exhibit tJie typical 
cusps of the Matterhorn type, due to cwms encroaching 
on three sides. Others again, such as Mt. Korde, the 
Whale Back and Whitefinger, are now like giant nuna- 
koller,* for the cusps have yielded to the smoothing 
action of frost erosion. 
Scattered over the glacier are tlie nunatakker* (such 
as Mount Suess) and nunakoller * (Gondola Ridge and 
Redcliffs) which have been described in the narrative. 
{(1) Space does not permit of any adequate account 
of the Great Piedmont Glacier. It lias a seaward edge 
some 200 feet thick over tlie land, and iov a considerable 
portion its front would appear to be floating, for here the 
edge is but 30 feet above the sea ice (and presumably 
200 feet below water level). It rises to some 2000 feet 
above the sea about 3 or 4 miles from the coast, and is beau- 
tifully moulded over hidden ntinakoller. One (jr two of 
these project above the ice about a thousand feet, and 
the mountains behind exhibit beautifully the relation of 
* Tlic two types of islands projectiiif; Uii-()ti^';li thu ice slieot need lo be 
disUnguishcd. Nuna-tah is 'lonely peak,' and 1 suggest miua-hol {fide (iran) 
for the rounded ridges which have been covered by the icc-ilood. 
