318 
PROCEEDINGS OF SECTION C. 
They are composed for the most part of quartzite and fragments 
of reddish purple sandy shale, weathering greenish grey, both varieties 
being precisely similar to the dominant local types of Archaean 
rocks. There can be little doubt that the bulk of the boulders and 
of the material composing the Glacial Beds, especially the reddish 
clay shales intercalated with the boulder beds, is of local origin, and 
derived from the crushing and partial trituration of the neighbouring 
Archaean rocks. Associated, however, with the blocks of purely 
local origin are various foreign rocks, true erratics, the parent rocks of 
which “ do not occur in situ nearer than the G-orge at Normanville, 
about thirty miles to the south. In all seventeen distinct varieties of 
rock, chiefly metamorphic, and foreign to the immediate neighbourhood, 
have been collected.”* 
Conspicuous among the foreign rocks is a variety of very coarsely 
crystalline red granite, containing crystals of orthocla.se felspar over 
2 inches in diameter. A rounded block of this, measuring 8 feet 
by 6^ feet by 4 feet, is observable on the beach a short distance to the 
south of the mouth of Field River, which empties into Hallett’s Cove. 
This has probably been derived from Port Victor or Port Elliott, about 
forty miles to the south of Hallett’s Cove. 
No fossils have as yet been found in the G-lacial Beds. In the 
opinion, however, of two of us (Professor David and YV. Howchin as 
the result of personal investigation of both fields), it is thought to be 
possible, on lithological evidence, that the beds are homotaxial with 
the Bacchus Marsh Beds of Victoria, and are therefore of Permo- 
Carboniferous or, perhaps, of Triassic Age. It is, however, possible 
that they may belong to any date intermediate between that of 
Miocene and late Paleozoic, as, for example, Cretaceous. 
A comparison of the striated pavements of Hallett’s Cove with 
those of Bacchus Marsh and Derrinal in Victoria suggests that the 
first- mentioned appears to be fresher and newer than the two Jast, and 
certainly the material of the Glacial Beds at Hallett’s Cove is generally 
less indurated than that of Bacchus Marsh and Derrinal, a fact which 
may point to the same conclusion. On the other hand, in places, the 
Bacchus Marsh and Hallett’s Cove beds are so like one another as to 
be undistinguishable in hand specimens. 
(3.) Arenaceous Limestone Passing Downwards into Soft Yellowish 
Sandstone . — The limestone contains an abundant marine fauna, deter- 
mined as Miocene by Professor Ralph Tate. The following are the 
most characteristic fossils : — 
Trophon anceps, Tate 
Tr option approximates , Tate 
Triton sexcostatus , Tate 
Gominella Clelandi , Tate 
AnciUaria orycta , Tate 
Marginella hordeacea , Tate 
Heligmope Dennanti , Tate 
Natica suhvarians , Tate 
ILipponyx australis , Lamk. 
Ostrea arenicola , Tate 
* Rep. Austr. Ass. Advfc. Sci., 
Australia. By Professor Ralph Tate. 
Placunanomia Ione> Gray 
Spondylus arenicola , nom. emend . 
( Pccten spondyloides , Tate) 
Pinna semicost ata. Tate 
Lithodomus brevis , Tate 
Liicina nuciformis , Tate 
Tellina lata , Q. and G. 
Lagan am p la ty modes, Tate 
Plesiastrwa Yincenti, T. Wds. 
Orbitolites complanatus , Lamk. 
[. i., p. 232. Glacial Phenomena in South 
