124 
the South .-1 ustraliaii Naturalist. 
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Excursion, Long Gully to Belair, Saturday, 10th May, 
1924. — A large paj'ty of members took train to Long Gully, 
under the leadership of Messrs. Walter Gill, L.L.rf., F.K.li.tS., 
and Mr. A. Wilkinson. The day was beautiful and the walk 
through the green verdure and lofty trees of this part of 
National Park was delightful indeed. The small gully from 
Long Gully Station was observed to grow chiefly the manna 
gum {Eucalyptus viminalis, Labill). The bark at the base 
of the trunk ol‘ this species varied a good deal, i.e., on some 
trees there was hardly any dark, rough bark, wliii(' on others 
it extended upwards I'or 10 to 15 ft. and beyond tlic, lower 
branches. Usually 1he rough bark was borne on the base 
of the trunk up to about 8 ft.; the trunk and branches above 
that were light in colm* and smooth. This ut3per bark 
decorticated in long strips and the tree is often known as 
‘G'ibbony” gum on this account. The stringybark {E.obliqua, 
LHer.) Avas seen in some numbers in the first part of titc 
walk, but it did not grow out of' the range where it debouched 
into the main part of the park, nor Avas it seen at a lower 
altitude than about 1,200 ft. The red gum {E. rostrata, 
Schlecht,) Avas ]iot at all plentiful within the track traversed. 
The yellow gum {E. leitcoxylon, F.V.M.) Avas seen in some 
numbers on the ironstone ridges, but they Avere not large 
trees. The blackAvood (Acacia melanoxylon, R.Br.) A\-as only 
represented by small specimens, and they preferred the 
higher altitudes Avith a corresponding heavier T-ainfaU. Not 
nuuiy trees of the native cherry (B,xocarpus cupressiformis, La- 
bill.) Avere observed, as this species does Jiot form dense 
stands. The trees arc usAially very symmetilcal and the 
bright green of the slendei*, numerous branches makes a 
j)leasing contrast in the eucalyptus forest. 
E.li.l. 
April 15, 1924. Lecture, “Glaciations of the Past, Avith 
Special Reference to Australasia.” By L. Kdth Ward, B.E., 
Government Geologist. 
The lecturer l)egan by saying that thei'e could be little 
doubt that the features of outstanding interest iji the geolo- 
gical history of South Australia Avere the changes produced 
by the agency of ice. At least tiiree glacial epochs Avere re- 
cognised in the record of this State. 
Existing glaciations are of two main types: (a) Continen- 
tal glaciers or ice-caps as seen in Greenland and Antarctica, 
(b) valley glaciers as in the Alps. The remains of ice action 
include the deposition of tillites, tiie polishing of T'oek floors 
