u 
IT. T. FERRAR. 
above the snow which surrounds it. When traced from west to cast the rock 
becomes finer grained. In places it encloses many vertical quartz-veins (5G0). 
Near E 4 , at a height of 5000 feet, Mr. Skelton obtained a specimen of grey 
granite (626), and another from a boss of rock just peeping above the snow. In 
this exposure the joint-planes dip to the south, and, in places, kersantite-veins (625) 
cross the mass. 
From the “ 3500 feet Knoll,” e 5 , Mr. Skelton brought back a specimen of 
a somewhat coarse-grained pink granite with phenocrysts of felspar up to a quarter 
of an inch across (555, 556). The exposure is much weathered, and it is here that 
the type (A) of hollowed rock* with 
the white (calcium carbonate) incrusta- 
tion (554) occurs (Fig. 16). This will 
be referred to later (see p. 88). 
At e c Dr. Koettlitz got a speci- 
men of dark grey hornblende-granite 
(563) with idiomorphic crystals of 
pink felspar up to one inch in length. 
The height at which this exposure 
occurs is more than 3000 feet, and 
the rock forms the eastern end of a 
spur of the Royal Society Range. 
The joint-surfaces are conspicuously 
developed, and are arranged as a 
syncline with east - and - west axis. 
Other specimens from this locality 
are a grey biotite-augen-gneiss 
and a doleritic rock (565). 
The Granite Hills between G 2 and G 3 (Plate IV). 
The hill G 3 rises to a height of 3500 feet above sea-level ; it is 1000 feet 
above the level of the Snow Valley, and nearly 2000 feet above the ice in the 
valley below. Eastwards the height decreases to 2000 feet, where this patch of 
bare rock is separated from the gneiss of G 2 by the ice-cascade previously 
mentioned. As a whole this G 3 block is a series of rounded hills ; as viewed from 
the surface of the Ferrar Glacier (Fig. 43, p. 78), it has no very conspicuous valleys, 
but presents an almost straight and even valley-wall. 
The specimens (55 7, 558) from near the summit of G 3 are all of hornblende- 
granite with large pink porphyritic crystals of orthoclase. 1 1 is here that type 13 of 
hollowed crystalline rock is found, and owing to the rapid weathering the ground 
* Ferrar, Geol. Mag., Dec. V, 1905, vol. ii, p. 190. 
Fig. 16. — Hollowed Granite-boclder in the Snow Valley 
NEAR THE ROYAL SOCIETY RANGE. 
