392 W. G. WOOLNOUGH. 
marked inland. While it is really beyond the scope sug- 
gested by the title of the present paper, the author wishes 
to suggest the possible bearing of the theory, above out- 
lined, upon the problem of the topographic development in 
the great interior Salt Lake Region. Jutson has implicitly 
stated that the summits of the higher levels in this region 
are the remnants of the Great Plateau. The author desires 
to make this statement explicitly, and to claim the laterite 
residuals like the Red Hill at Coolgardie (Plate XXX, fig. 3) 
as the remnants of a peneplain contemporaneous and co- 
extensive with the Darling Peneplain. During the great 
rest-period, when laterization was going on, this surface 
was at a much lower level than at present, quite low enough 
to account for the submergence below sea-level which has 
been noted at Lake Cowan (Norseman). 
While it is by no means so certain as the fact of the 
existence of a western coast not far from the present one, 
there is strong probability that a coast line existed away 
to the south-east of the Coolgardie area. The comparatively 
recent date of the limestones of the Nullarbor Plains (Hucla 
Limestone Plateau of Jutson) suggests former extension of 
the Southern Ocean as a veritable Mediterranean Sea far 
into the south-eastern portion of the State. 
The uplift which produced the Meckering Level on the 
western side rejuvenated the drainage on the eastern side 
as well. As Jutson has pointed out, there is every reason 
to believe that the climate of the interior of Australia was 
formerly much moister than it is now. Under such con- 
ditions a development of mature valleys analogous to those 
of the Meckering level may be postulated. As these would 
be base-levelled, their lower courses would undoubtedly 
enter salt water, and Lake Cowan may have been a bay or 
estuary. 
About the time of the main Darling Uplift, which may 
also have caused the Bunda Scarp, the progressive desicca- 
