42 
II. T. FERRAR. 
The carbonaceous band (G) had been slickensided and baked to such an extent 
that it has proved impossible to determine the fossils which it contains (see report by 
Mr. E. A. Newell Arber, on p. 48). 
The Inland Forts (Fig. 20). 
Five miles west of the Inland Forts, at the spot marked y 2 on the map, the 
cliff forming the north side of the glacier is composed of two rocks, a yellow one 
below and a dark one above. The junction as usual is regular and almost 
horizontal. On examination the yellow rock proved to be sandstone. The 
only accessible part was the base of the cliff where the rock is a sandstone barren 
of fossils. It is subdivisible into a series of alternate yellow and white beds, and 
a few pebble-patches were 
noted. The following section 
from the level of the ice up- 
wards, shows the order of 
succession : — 
Top. (4) 100 feet — brown col- 
li rnnar rock 
(dolerite) 
(3) 100 feet — yellow 
sandstone 
(2) 100 feet — uniformly 
light - coloured 
sandstone 
Bottom. (1) 100 feet — a yellow 
and much banded 
sandstone. 
At the Inland Forts, where the hills are at about the same level as those 
below y 2 , 2000 feet of the Beacon Sandstone are exposed, and of this nearly 
1500 feet have been examined. The Forts are four conspicuous hills mainly 
composed of sandstone, but they are capped by dolerite (Fig. 20). They are separated 
by well-marked cols through which the ice once forced its way northwards into the 
adjoining drainage-system. The exposure is well illustrated by the photographs of 
this side of the valley. The sandstone is part of a great deposit which is buried 
westwards beneath the Inland-ice and determines the distinctive features of 
the mountains on each side of the main valley of the Ferrar Glacier. 
Extending southwards from C 6 and C 8 are two ridges of similar, sand- 
stone. These ridges have rounded outlines and resemble groins built against a 
sea-wall to break the force of the waves. Though now r above the level of the 
ice, they formerly acted like groins and thus collected rock-material ou their 
westward side. These ridges, which I have termed the West and the East 
East Groin Round Mount, C, 
Fig. 20. — The Inland Fobts. Sandstone capped by Dolerite. 
