GLACIAL ACTION—VICTORIA. 363 
sandstone. In all cases where these local boulders have been 
observed, the surface of the granite rises at a sharp angle of 
from 20 degrees to 70 degrees.* 
On close examination, the stratification of the sandstone can be 
traced up to the face of the boulders. In no instance have blocks 
of local granite been observed to the lee of the granite boundary. 
The matrix of the glacial drift situated on the lee of the granite 
area does not differ from the general character of that to the lee 
side of any silurian area, either in contained boulders or the 
matrix in which they are embedded, as far as can be judged from 
macroscopic examination. In certain places, however, a layer of 
several inches in thickness composed of rotten local granite can be 
observed resting on the granite base. Like the local boulders 
these patches occur at the foot of steep faces of granite, or along 
the bottom of pre-glacial hollows. A number of observations show 
that in no case, with the above exceptions, does the glacial matrix 
appear to be formed from local granite. In a number of places, 
more especially where the granite face is flat, or has a gentle 
slope, a thin layer of highly waterworn pebbles of various sizes 
and kinds up to three quarters of an inch in diameter, rests directly 
on the undecomposed glacial surface of the granite. Above the 
pebbles are the usual highly stratified sandstones and mudstones 
with bands of conglomerate formed of waterworn pebbles in which 
fragments of local granite are not represented. In a few places 
the grains of sand resting on the pebbles, and in direct contact 
with the granite face, are somewhat larger than those at higher 
levels ; but in others, only a few chains apart, exceedingly fine 
stratified sandstone is in contact with the granite. 
II, ABSENCE OF LOCAL BOULDERS. 
After a search extending over several years for local boulders 
in the glacial deposit, one is forced to conclude that the occurrence 
of such is somewhat rare. During this period rock fragments, 
which could be classed as local, have not been found, with the 
exception of the granite blocks which occur on the bottom of pre- 
glacial gullies or at the foot of steep slopes or cliffs. On the other 
hand, many kinds of rock, a large percentage of which are supposed 
to be foreign to Victoria, are found in abundance. 
III. ABSENCE OF UNSTRATIFIED GLACIAL DRIFT. 
Perhaps one of the most striking features in the Bacchus Marsh 
glacial deposits is the almost total absence of unstratified material. 
This is the more inexplicable, as the other evidences of powerful 
ice action are present in a marked degree. 
* Speaking for himself, Mr. Brittlebank considers that they have probably fallen from a 
higher level. 
