THE DARLING PENEPLAIN OF WESTERN AUSTRALIA. 389 
even if the same difference existed prior to uplift. There 
is then no necessity to postulate a tilt as well as bodily 
uplift, though it is possible that sucha tilt may have taken 
place. 
Up to this point the author’s observations are merely a 
corroboration and amplification of the principles laid down 
by Jutson. Here, however, the author desires to diverge 
somewhat. Jutson has made no mention of residuals of an 
older landscape standing above the surface of the Darling 
Peneplain, and such residuals are by no means abundant or 
conspicuous. One’s outlook from one of the laterite scarps 
usually so circumscribed, owing to the heavy jarrah forests 
and to the youthfulness of erosion of the stream valleys, 
that an extensive prospect is rarely obtained. The author 
was fortunate enough to visit the estate of Mr. A. R. Gorrie 
near Chidlow’s Well, and to obtain thence a magnificent 
panorama of part of the Darling Peneplain (Plate XXX, 
fig. 1). From this point of view the existence of monadnocks 
of considerable dimensions was at once recognised. The 
chief of these is Mount Dale, associated with which are a 
number of other out-standing peaks including Kagle Hill, 
Mount Randell and others. Ontwo recent motor journeys 
between Perth and Albany, near views of Mount Randell 
(about 45 miles south of Perth) were obtained, and the 
general contour of the mountain strongly bears out the 
views stated as to its mode of origin. The same group of 
hills also forms a conspicuous landmark from the higher 
ground near Williams (100 miles south of Perth) and from 
this aspect also their residual character becomes apparent. 
There is therefore evidence of the existence of a higher, 
and therefore older, level of erosion for which the name of 
the “‘ Mount Dale Level’’ is proposed. 
Jutson has noted the highly mature character of many 
of the valleys on the surface of the Darling Peneplain, of 
which the Avon River at York and Northam is a striking 
