95 
SUNKLANDS OF PORT PHILLIP BAY AND BASS STRAIT 
at Flinders; it bears S.E.b.S. from Mount Bellarine to Sorrento, 
thence S.E. to Main Creek at a point N.E. of Cape Schanck, and, 
finally, easterly to Flinders. The Bellarine Fault is postulated 
about 7 miles off the shore from the Otway Coast (Fig. 12). Sec- 
tions of the floor of Bass Strait suggest the downward extension 
of Torquay Fault (Hills, 1940), but when the exaggerated vertical 
scale of these sections is appreciated this seems improbable. More- 
over, w^hile the Torquay Fault curves in towards Geelong about 
12 miles S.W. of Barwon Heads, the Bellarine Fault persists in 
its N.E. strike as the north-west boundary of the Sunklands as 
far as St. Leonards on the east shore of the Bellarine Peninsula; 
beyond this point it is covered by the waters of Port Phillip, 
but reappears on the east shore of the Bay as the Beaumaris 
FIG. 9. 
Section Line from Mt. Bellarine to Flinders. 
Monocline, and extends some distance inland. The Beaumaris 
Monochne is the only appearance at the surface of this line ot 
weakness; the evidence for it is, otherwise, largely inferential. 
It is known that the Carrum Swamp, probably the south-west 
extension of the Croydon Sunkland (Jutson 1910) has been 
lowered by the monocline. The evidence for this is a bore about 
sea level near MordiaUoc, which passed into Tertiary Older Basalt 
at 233 feet; north of Frankston, on the relative upthrow side of 
Selwyn’s Fault, which is the S.E. boundary of the Sunkland, 
the Older Basalt outcrops at approximately 50 feet above sea 
level suggesting a subsidence of about 280 feet. The profile o 
Dandenong Creek, from near Dandenong where it passes on to 
the Carrum Swamp, to the submerged delta on the floor of Port 
Phillip, is shown in Fig. 10. The Patterson River, a channel cut 
