SUNKLANDS OF PORT PHILLIP BAY AND BASS STRAIT 97 
The movements along these lines are complicated by both 
upthrow, or uptilting, and downthrow, or downtilting, and, con- 
fining our remarks to the Mornington Peninsula, it is evident 
that, although there has been a cumulative downwarping of 585 
feet on the north-west side of Selwyn’s Fault, there has been an 
upward movement on the north-east side of between 400 and 500 
feet ; this is shown by the existence of a dune series, probably the 
Lower Dune Series, on the upthrow side near Cape Schanck, 
approximately 500 feet above L.W.M. 
The problematical line between Rosebud and St. Leonards is 
near, and probably coincident with, the north-east face of the 
Upper Dune Series; south-west of it are the shoal waters of Port 
Phillip, and north-east the deeper waters of the Inner Basin. 
The inference that there has been movement along this line is 
based on the fact that south of it there is a big suite of beds in 
the Sorrento and other bores, typified by a class of sedimentation 
not found north of it, nor do the dune limestones occur to the 
north of it. There is possibly some connection between it and 
the Barrabool Hill-Curlewis Fault of Coulson (1939), which he 
says has a throw of 300 feet to the north of Ceres, near Geelong. 
The late Pleistocene and Recent movement contributing to the 
final shaping of Port Phillip was downtilting on warps inland 
from the north-west shore of that Bay. This warping and 
tilting is parallel with the Bellarine Fault, and consequently the 
Otway Coast trend rather than that of the tectonic lines of the 
Mornington Peninsula. 
King Bay and Bass Strait Sunklands 
VIII. Evidence of the King Bay and Bass Strait Bathymetrical 
Contours. 
The bathymetrical chart (fig. 12) of King Bay and Bass 
Strait is compiled from Admiralty Chart 1695B, corrected by the 
Admiralty up to 1943. From 1909 to 1914 the F.I.S. Endeavour 
explored the waters of Bass Strait and Dannevig prepared 
diagrams based on the exact soundings then taken; these, unfor- 
tunately, are not available— they were probably lost when the 
vessel foundered with him and all hands. In his notes, Dannevig 
(1915) points out that the compilation of the Admiralty Chart 
from soundings, for which various methods were employed, has 
been a gradual process since Bass Strait was discovered. He 
found that these soundings, particularly under 35 fathoms, show 
a greater depth, and the undulations suggested by the charts do 
not always occur. Irregularities are most pronounced in places 
