THE DARLING PENEPLAIN OF WESTERN AUSTRALIA. 385 
THH DARLING PEHENEPLAIN OF WESTERN 
AUSTRALIA. 
By W. G. WOOLNOUGH, D.Sc., F.G.S. 
With Plate XXX. 
[Read before the Royal Society of N.S. Wales, September 4, 1918.] 
THE foundations of the study of the physiography of Western 
Australia have been laid deep and strong by Jutson in his 
masterly survey of the question in Bulletin No. 61 of the 
Geological Survey of that State, published in 1914. The 
author desires to express his admiration for the work done 
by this investigator, a work remarkable quite as much for 
its sobriety of hypothesis as for its scope of reading, care 
in investigation and profundity of deduction. As Jutson 
himself has pointed out, little detailed investigation of 
physiographic problems has been carried out in Western 
Australia, and the results of a preliminary statement of 
physiographic structure cannot be considered as final or 
complete. From time to time the author hopes to add 
contributions to the subject. The present note in some 
ways elaborates, and in others differs from the views of 
the previous author. 
With Jutson’s main premise, that the “‘ Great Western 
Australian Plateau ”’ is a vast uplifted peneplain, the author 
is entirely in agreement. Peneplain is here used in the 
sense of an almost level, or, at most, a gently undulating 
surface, carved out at an altitude very near base-level of 
erosion (usually sea-level), by the ordinary forces of sub- 
aerial erosion under humid conditions. Asa result of many 
years of teaching experience, it has been found extremely 
Y—September 4, 1918. 
