SUNKLANDS OF PORT PHILLIP BAY AND BASS STRAIT 
85 
There are no water courses on the Nepean Peninsula. All the 
water that comes down in the stream channels on the denuded 
scarp of Selwyn’s Fault percolates into the dune deposits at the 
foot of the scarp; the dune rock is too porous 
waters. There is a shallow channel from the foot of that Fault 
to the Tootgarook Swamp cut by flood waters, but it is dry except 
during flood periods, and then water only flows in it for a few 
Between Rosebud and Rye, and extending inland towards the 
shore of King Bay, are the swamp deposits, peat and marl, of 
the Tootgarook Swamp ; these were deposRed in a former tide- 
way— the^ Tootgarook Tideway. On the shores of Port Phillip 
and King Bays are raised beaches, and overlying these at places. 
