78 
president’s ADDRESS — SECTION C. 
showed a thickness of at least 3,500 feet, provided the beds are not 
repeated by faulting, These beds consist of — 
(i.) Hard mudstones with small well-glaciated boulders. The 
groundmass is brownish-grey. Described by Messrs. Daintree and 
Wilkinson as light claret -colour where weathered, and as bluish- 
grey at a depth. It is composed partly of clayey material, partly 
of quartz grains, mostly subangular. but a few well-rounded. A 
small proportion of fragments of uudecomposed felspar, and minute 
chips of black shale are present, together with small pieces of 
carbonised plants. The diameter of the boulders varies from a few 
inches up to 5J- feet, but that of most of them is less than a foot. 
None observed by me were absolutely angular, all being subangular 
or rounded. Several of the boulders, which are most powerfully 
glaciated, are flattened on one side like a holystone. Well-rolled 
pebbles, faceted or simply faced by having had one side rasped 
down, arc frequently noticeable, some of the smaller ones presenting 
the appearance of having been literally half ground away, as if on 
a grindstone. They are very firmly bedded in the groundmass, as 
though the whole had been subjected to considerable pressure. The 
thickness of individual beds of this formation varies from about 20 
feet to 40 feet. 
(ii-) Conglomerates, greenish-brown and lithologically resembling 
those of Newcastle, in New South Wales, composed of well-rolled 
pebbles from an inch or so up to 6 inches in diameter, with, rarely, 
large glaciated erratics. The conglomerates in places, as at the elbow 
of Myrniong Creek, about half a mile below Dunbar, the residence 
of Mr. Brittlebank, make a very uneven junction line with the 
bouldery mudstones underlying them, as shown in the photograph 
exhibited, suggestive of their having been squeezed down by pressure 
from above, so as to form pockets in the underlying mudstones. The 
thickness of individual beds varies from 8 feet up to about 50 feet. 
(iii.) Sandstones, brownish to whitish-grey, in places finely 
laminated, or showing distinct ripple mark. When finely laminated 
the lamina* exhibit a remarkable amount of contemporaneous con- 
tortion. The more massive varieties of soft brownish-grey ferruginous 
sandstone contain leaves of Gang a mop ter is in tolerable abundance on 
possibly two distinct horizons, neither of which can be less than 3,000 
feet above the base of the glacial beds. Fragments of plants, identified 
by Sir Frederick McCoy as Schizoneura and Zeugopliyllites, have 
been obtained from a bed of sandstone close to the top of the glacial 
series on the east of Korkuperrhnal Creek, above the small quarrv. 
The angle of dip varies from a few degrees up to over 45° in the 
upper portion of Korkuperrimal Creek, being southerly at from about 
43 c to 45° for a distaiice of nearly three-quarters o± a mile at right 
angles to the strike. The direction of the dip is easterly at the 
Gangamopteris quarry, on the lower portion of Korkuperrimal Creek, 
and also at the Werribee Gorge, the angle varying from about 5° up 
to 27°. Strong unconformability follows. 
(7.) Post- Ordovician and Pre-Permo- Carboniferous Granite . — 
This rock has intruded the Ordovician strata, but is clearly older than the 
glacial beds, which, where resting on it, are largely composed of pebbles 
and finer material derived from its waste. Along the junction line of 
the granite pavement with the glacial boulder beds the rock has in 
