96 SUNKLANDS OF PORT PHILLIP BAY AND BASS STRAIT 
to drain the Swamp, marks, approximately, a former course of 
Dandenong Creek. A feature in this section is the steepness of 
the profile for about a mile in front of the Swamp. 
Selwyn’s Fault, a well authenticated line of movement, has, on 
the shore of Bass Strait, the appearance of a warp with incipient 
fractures: the warp tilts the beds on its north-west side down- 
wards at a small angle. As a line of movement (Fig. 2) it can be 
traced from north-west of Frankston, along the east shore of Port 
Phillip, across the Nepean Peninsula, and under King Bay. The 
bathymetrical chart of Bass Strait (Fig. 12) suggests its extension 
FIG. 10. 
Profile of Dandenong Creek south of Dandenong. 
as far as Cape Wickham, the northernmost point of King Island. 
Hills (1940) says “it is a hinge fault, the displacement dying out 
to the north but increasing towards the south, where a great 
thickness of marine Cainozoic rocks, which were penetrated in a 
bore at Sorrento, has been deposited on the downthrow block.” 
Parallel to Selwyn’s Fault, there is, in the centre of the 
Mornington Peninsula, a well marked line of shatter belt called 
the Devilbend Fault, and still further east another line parallel 
to it, known as the Tyabb Fault. The existence of the Balcombe 
Fault between Selwyn’s and the Devilbend Faults and parallel 
to them is inferred from the pattern of the stream system on that 
portion of the Peninsula. 
FIG. 11 
Section of Mornington Peninsula showing Movements of Fault Blocks. 
