RIVER TERRACES OF THE MARIBYRNONG RIVER, VICTORIA 65 
records of fishes, but without details as to what part of the 
Swamp they came from. One was a tooth of the White Shark, 
Carcharodon carcliarias Lin.; another, the caudal spine of the 
Blue Spotted Ray, Myliohatis australis MacLeay. The skull of a 
dolphin is stated to have come from a depth of 10 feet, and was 
obviously deposited before the eustatic rise. The White Shark 
and the Ray imply some depth of water, and we are reliably 
informed that the White Shark does not frequent brackish or 
fresh water. 
In the National Museum collection there is a gasteropod 
described thus: Marcia nitida (Q. & G.) Pleistocene (Raised 
Beach) Saltwater River, Ascot Vale. Presented by Thomas Keys 
17.4.06. No. 7616.” We have been unable to locate the part of 
Ascot Vale from which the specimen came, but the inference is 
that it w^as one of several presented at the same time by Keys from 
sewerage excavations in Epsom Road (Fig. 6). If so, the site is 
south-east of Quarry Hill and the east side of the Estuarine Flood 
Plain. 
Again, in regard to wave platforms round the Yarra Delta, we 
are dealing with an area that has undergone almost complete 
transformation since it was settled, but we are fortunate in 
having, at one locality at least, a reliable railway section made as 
far back as 1854. The section shows two platforms on the western 
fringe of the Delta, at the foot of the slope leading up from it to 
the Newer Basalt plain on which the city of Footscray is situated. 
The Delta here is approximately 1,500 yards wide and its surface 
about 5 feet above L.W.M. The shoulders of the platforms are 
masked by talus, but, allowing for this, their estimated levels are 
9 feet and 13 feet above L.W.M. No platforms are evident on 
the opposite eastern fringe, but the grades of its slope alter at 
elevations corresponding approximately to the platforms on the 
western fringe. Less than a mile upstream, the 13 ft. platform 
is repeated in the same position as regards the fringe of the Delta. 
The fact that in both occurrences the platforms are at the same 
elevation negatives the possibility that they are the downstream 
extensions of the Maribyrnong Terrace, which would imply a fall 
for that flood plain of 19 feet to the mile. There is evidence of 
a 13 ft. terrace a short distance upstream from the head of the 
Estuarine Flood Plain (Fig. 6) and of a 10 ft. platform on the 
Flemington Racecourse. 
We are unable to visualise the formation of terraces such as 
these by entrenching following tectonic uplifts of which there is 
no evidence in the Yarra Delta. Had there been uplift, the 
channel of the Maribyrnong River would have been lowered. 
