362 PROCEEDINGS OF SECTION C. 
boulder clay which is composed of some other rock.” Accepting 
the above as being correct for the glacial deposits of the northern 
hemisphere, search was made for a spot where two underlying 
rock formations were of such anature as to produce two entirely 
distinct boulder clays, had they at any time been subjected to 
invasion by land or sheet ice. As the section under notice is of 
some importance, a brief description of the contour of the under- 
lying older rocks will not be out of place. 
At 21 chains W. 30 degrees N. from the junction of the 
Myrniong Creek with the Werribee River there is an area of 
granite extending over several square miles. 
As a large proportion of the above granitic area lies to the 8S. W. 
or in the direction from which the general ice movement took 
place, this, coupled with the physical features of the striated pave- 
ments, would lead one to conclude that had land ice passed over 
this area we should find evidence of the direction of its move- 
ment in the form of ‘tail,” and also in the composition of the 
glacial deposits to the N., N.N.E., and E. Tracing the glacial 
pavement from the junction of the Myrniong Creek W. 30 degrees 
N. (about) for a distance of over 80 chains, we find the surface 
worn into three ridges with corresponding hollows. A distance 
of about 20 chains separates the ridges, and the greatest height 
of any ridge above the hollows along this section is 330 feet. The 
steepest face, however, is one in which there is a fall of over 150 
feet in 5 chains. 
From the junction of the Myrniong Creek and on the opposite 
side of the Werribee River to the above section, the older rocks 
(silurian and granite) rise abruptly to the 8.S.W. ; in fact at one 
time there must have been an exceedingly steep pre-glacial bank or 
cliff over which ice flowed or fell. (See Plate XVIII.) At the 
present time the slope rises 520 feet in less than 36 chains. At 
other points the rise is much sharper, but at these chaining was 
impracticable owing to the rough nature of the country. 
The trend of this cliff is about W. 25 degrees N., and E. 25 
degrees S., being about 35 degrees across the general direction of 
ice inflow. As the ice must have passed over the granite area for 
over 70 chains before flowing down the steep face or cliff, and as 
there are fine sections of glacial drift to the N.N.E., and E. (some 
of which are, as stated above, as much as 560 feet below the 
general surface of the granite area), careful search was made for 
any evidence of a true till or ‘“ tail” which one would expect to 
find on the lee-seite of the cliff. Although all the exposed 
sections to the N., N.W., N.E., and E. have been searched for 
boulders or fragments of local granite, the search has been with- 
out result, except in such places as those where fragments and 
blocks of granite are observed resting on the granite surface, 
or a few feet above it, where they are embedded in stratified 
