
TINDALE—SUBDIVISION OF PLEISTOCENE 643 
correct in interpreting them as representing a single terrace unit, although he did 
so on entirely different grounds. 
During the retreat phase of the sea which followed Reedy Terrace times, the 
stream appears to have flowed out across what is now the sea floor of Lacepede Bay 
in a valley which conveniently may be known as Lacepede channel. 
Still later, soon after the beginning of the earliest of the Woakwine Terrace 
dune formations, Reedy Creek was cut off from direct access to the sea at 
Blackford and once more began to be diverted, step-by-step northwards behind 
the developing Woakwine shore dunes. For a period it seems to have maintained 
a channel open to the sea west of Taratap Station at about the northern end of 
Seetion 11, Hundred of Duffield. Diversion again became effective and the stream 
mouth shifted to near Coolatoo where it became joined with Brown Cattle Creek. 
Its mouth was maintained there for what may have been a long period of time. 
The stream bed seemingly can be traced out to sea as Coolatoo channel. Yet again 
diversion began and by the end of the complex events of Woakwine times its 
mouth came to be at Salt Creek, 40 miles north of its position at the end of Reedy 
Terrace times, 
Brown Cattle Creek, prior to late Woakwine times, had been an independent 
stream. It had, throughout Reedy Terrace time maintained a channel through 
the early and late dunes of the terrace at the northern end of the Hundreds of 
Duffield and Landseer, locally cutting its bed down to porphyritie granite bedrock 
on the northern boundary of Duffield, It drew its head waters from the Naracoorte 
area. 
Following the end of Woakwine Terrace times, the combined waters of Reedy 
and Brown Cattle stream beds apparently flowed out towards a low level seashore 
by a channel indicated off-shore between Salt Creek and Chinaman Well. This 
Chinaman Channel can be traced out on the continental shelf for at least 60 miles. 
The temporary stabilizations of Reedy Creek mouths at Hatherleigh, 
Blackford, Taratap and Coolatoo, ete., furnishes probable indications of the inter- 
polation of a temporary low sea level phase at each of these times. 
Tt seems clear that the step-by-step northward diversion of Reedy Creek 
cannot be regarded as due to small intermittent tectonic tilting movements, but 
was initiated by the trend of local shore currents. The reality of this has been 
demonstrated by the experiences of the engineers of the South Eastern Drainage 
Board. In recent years in their endeavours to maintain the mouth of the present 
drainage channel of Lake Bonney, they have met with diversionary activities by 
shore currents, with this difference that at present the shore currents off Lake 
Bonney South are diverting the mouth southwards. Similarly, the present Murray 
mouth is moving southward. 
It is of some interest to note that the traces of submarine channels on the floor 
