
634 RECORDS OF THE S.A. MUSEUM 
vicinity evidence suggesting its diversion northward during late Reedy Terrace 
times. The presence of lacustrine and estuarine deposits near Hatherleigh con- 
nected with its former channels has, over a distance of about 25 miles, introduced 
eomplexities in the physiography deserving of special study, 
According to a very tentative interpretation, the front of Reedy Terrace 
ean be linked with Tatherleigh and Millieent Ranges and also forms the old 
sea shore evident at Tantanoola (elevation, approximately 80 feet). According 
to this view, Millicent North stands on a line of dunes between two swamp areas. 
This line of dunes is a transverse beach ridge developed at the northern end of 
Wyrie swamp at a time when it formed part of the lagoon behind the Woakwine 
Terrace dunes. The altitudes of the sirand plain of Wyrie swamp, 5) feet 
(17 metres), and of Mt. Muirhead Flat, behind this terrace front (60 feet), may be 
held to support this interpretation. Further south, evidence of what is apparently 
the earliest phase of Reedy Terrace is found on the plain near the foot of Mt. Burr 
Range. At Section 225, Hundred of Hindmarsh, it is a marine terrace, eut in 
Miocene limestone and strewn with tabular flint boulders and marine shells 
tm silm at an elevation of 80 feet (25 metres). This height was estimated by 
R. A. Keble and the present writer, using aneroid readings tied to a draimage 
survey datum of 62 feet at Suuggery., ‘The same marine floor appears near the foot 
of Tantanoola Cave searp on the inland side of dunes, Also identified with an 
early stage in the formation of this terrace, at an altitude of 90 feet (28 metres), 
read by aneroid and tied to the railway survey datum at Tantanoola Station, 
835 feet (26 metres) is a flint boulder beach dn situ, covered by dunes, the sands of 
which rise to heights up to 115 feet ina belt about a mile in width, The seaward face 
of the terrace is a broad plain 80 feet (25 metres) above sea level, which crops 
rather suddenly down, west of Suugegery, to the level of Wyvie Swamp at 55 feet 
(17 metres), 
An interpretation contrary ta the above, unpublished, regards Millicent, 
Range, in the vicinity of Millicent, as the inland margin of the Woakwine Terrace, 
with the rest of which 1t links up by way of the uplands of Millicent. North. 
Acceptance of this view would seemingly inean that the earliest Woakwine Terrace 
floor and dines were locally elevated approximately 30 feet. Sinee the front of 
tle Woakwine Range stands here at the same height (25 feet) as elsewhere, this 
uplitt must have been completed and its effects on the local shoreline largely 
removed before the end of Woakwine Terrace time. This suggested local disturb- 
ance, if it be real, does nol appear to have affeeted general terrace velationships in 
the Mt. Sehank areas ancl elsewhere to the south as Taras the Glenelg River. 
Attempts have been made to trace Reedy Terrace northward to the Murray 
River, Beyond County Cardwell a terrace ocenrs and has been observed inland 
