78 
Geology and Physical Geography: 
That these rocks do not extend to the north-east shore of Port 
Phillip is evident from the outcrops of the Silurian rocks at and 
around Melbourne, and on the St. Kilda beach at Kenny’s baths, 
but it is possible that a tongue of Mesozoic rocks, extending in the 
direction of Bacchus Marsh, may underlie the great volcanic plains 
between Williamstown and Station Peak. 
Mesozoic Area of Western Port and South Gippsland, 
Cape Woolamai, the south-east extremity of Phillip Island, 
consists of grauite, while on the opposite eastern or mainland side 
the Mesozoic rocks appear in full development at Griffith’s Point. 
The eastern passage of Western Port Bay thus forms the extreme 
western limit of this group of rocks at the coast line. From Griffith’s 
Point eastward they form clitfs along the greater part of the coast 
line as far as Anderson’s Inlet, where recent sandy and alluvial 
deposits cover their line of contact with the Silurian rocks of Cape 
Liptrap. A line from between Anderson’3 Inlet and Cape Liptrap 
over to the north of Foster, 
at the head of Corner Inlet, 
would indicate very nearly 
the boundary between the 
Silurian rocks on the south 
and the Mesozoic on the 
north. The former dis- 
appear altogether a short 
distance east from Foster, 
while the latter have been 
proved to a considerable 
depth below sea-level in 
bores put down at various 
places between Foster and 
Port Albert. From Corner 
Inlet north-eastward to 
Toni’s Cap, the Mesozoic 
rocks constitute the pre- 
vailing rock-formation of 
the ranges which slope 
towards the level Tertiary 
country bordering the 
coast. 
On the north the Tertiary 
valley of the Koo-wec-rup 
Swamp and Lang Lang 
River, extending up from Western Port to the low saddle of the 
southern spur near Drouin, and thence the valley of the Moe 
Swamp, down to the junction of the Morwcll and La Trobe 
Fig. 2G. — Sketch Flan. 
a Silurian. h Mesozoic conglomerate. 
c Mesozoic sandstones, &t\ 
Sketch Section. 
.River Bed. 
a Silurian. b Mesozoic conglomerate. 
c Mesozoic sandstones, &e. 
