68 
found of this age in such remote places as Great Britain, India 
South Africa, and Australia. It is possible that further search 
in the Hallett’s Cove beds may bring to light some fossil remains 
that will definitely fix the date of their deposition, but at present 
analogy seems to point most strongly to the conclusion that the 
Bacchus Marsh and the Hallett’s Cove formations belong to the 
same geological age. The Victorian beds rest on Silurian, or 
on granite, and, like the Hallett’s Cove beds, are capped by 
Tertiaries. 
THe InmMAN VALLEY SHALE. 
Since the late important discoveries at Hallett’s Cove, it has 
occurred to me that there may possibly be some relationship be- 
tween the glacial beds of the latter and the mudstones which 
occur in an isolated patch in the Inman Valley, The peculiarity 
of this formation attracted the attention of Mr. Brown, the 
Government Geologist, who thought it might be an outlier of the 
Jurassic rocks of the Leigh’s Creek district, and under his ad- 
vice the Government has bored through nearly a thousand feet 
of these beds prospecting for coal without reaching the bed rock. 
Evidences of glacial action are not wanting in this district. 
Granite boulders of great size can be traced from the Bluff, as a 
radiating centre, up the Inman Valley for miles. As far back as 
1859 Mr. A. R. C. Selwyn reported as follows :—‘‘At one point 
in the bed of the Inman I observed a smooth striated and grooved 
rock surface, presenting every indication of glacial action.” Al- 
though this spot has, unfortunately, not been rediscovered, it is 
not likely that so good a field geologist as Mr. Selwyn should have 
been deceived in his observations. Mr. H. Y. L. Brown in his 
report (1892) describes these undetermined deposits in the follow- 
ing terms :—‘“ This formation consists of a jointed shale, varying 
in color from a bluish-green to black, and interstratified with 
them there are undulatory beds of sandstone and quartzose sand- 
stone, and occasionally limestone of irregular thickness. The 
upper portion of this shale, which in some places exhibits a con- 
cretionary structure, has become decomposed into clay, and con- 
tains water-worn pebbles and boulders of granite, quartzite, 
sandstone, ironstone, &c. Some of the boulders of granite are of 
great size, and in character resemble the granite of Victor 
Harbor.” I think from the evidences before us it is not impro- 
bable that these anomalous beds of the Inman Valley may prove 
to be of the same character and age as the Hallett’s Cove and 
Bacchus Marsh glacial formations. 
THE SOURCE OF THE ICE. 
A word may be said, in conclusion, as to the probable source 
from whence the ice originated. In view of the extremely low 
