PRESIDENT^ ADDRESS — SECTION C. 
69 
impossible to account for their presence except on the glacial sup- 
position.” 
In 1886 Mr. James Stirling records glaciated surfaces^ at eleva- 
tions between 4,000 and 6,000 feet, on the quartz porphyries of the 
Cobboras, and on the metamorphic rocks of Mount Pilot down to 
3,000 feet. He also describes (op. cit p. 487) evidences of 
glaciation at Mount Bogong, 6,508 feet high ; and ho and Professor 
Lendenfeldt refer to huge masses of angular and subangular basalt 
at an elevation of only 1,000 feet above the sea, towards the Beewa 
Valley, as undoubted moraines. 
In 1886 Mr. B. M. Johnston records evidence of huge ice-borne 
erratics of Permo-Carboniferous age at One Tree Point, Bruni Island, 
Tasmania. f 
In the year 18S7, in a paper read before the Geological Society 
of London,! I recorded — 
(L.) The possible evidence of ice-action in Siluro-Devonian rocks, 
as observed by Mr. C. 8. Wilkinson. The beds supposed to be of 
glacial origin are gold-bearing conglomerates two miles north of the 
town of Temora, in New South Wales. It is stated (op. cit., p. 195) 
that “the boulders are much rounded, polished, and in some cases 
striated. The blocks consist chiefly of quartz imbedded in a clayey 
base ; the largest have a diameter of 4 feet.” Mr. Wilkinson 
showed me one of the smaller blocks from this conglomerate. It 
had the appearance of being a waterworn pebble, and certainly 
showed stria?, but I think that it was doubtful whether they were of 
true glacial origin. 
(2.) In the same paper I recorded the occurrence of numerous 
erratics in Per mo- Carboniferous Upper Marine strata at Grass- 
tree, twenty-eight miles north-westerly from Branxton (op. cit., 
pp. 192-193). They are described as follows: — 
“ The deposit here consists of reddish-brown to greenish -brown 
shales, and is crowded with round and subangular fragments of rock, 
from pebbles no larger than marbles up to blocks one-third of a ton 
in weight. * # # Lenticular patches of gravel may be 
observed in places filling contemporaneously eroded hollows ; but 
stratification, if it exists, is not strongly marked. 
“ Most of the boulders in the beds are more or less rounded, 
angular fragments being rare; their shape is very irregular, but 
generally oue end is more pointed than the other, and as a rule their 
outlines are less convex than those of waterworn pebbles. 
“ Most of the stones presented the appearance of having been 
ground, and showed a dull polish, and many exhibit well-marked 
striae. # # * 
“ They are scratched on the top, bottom, and sides. The striae, 
although plainly visible, are not deeply cut, and no grooves were 
observed. Most of the boulders are covered with a thin crust of 
carbonate of lime, the derivation of which is obvious from the 
calcareous nature of the shales. * # # 
“ The largest boulders are granite, clay slate and aplito.” 
* Proc. Lin. Soc. N.S. W», Second series, vol, i., 1886, pp. 483-488, 
t Proc. Roy. Soc. Tasmania, 1886, pp. 23-24. 
X “Evidence of glacial action in the Carboniferous and Hawkesbury Series, N.S. W.” 
Q.J.G.S., vol. xliii., pp. 190-196. 
