RELATIONSHIPS OF THE AUSTRALIAN CAINOZOIO SYSTEM. 
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above, and comparable with those beds known elsewhere, as in 
Western Victoria, as the older gold-drifts.” The general sequence 
of the strata in Port Phillip between Frankston and Mornington 
appears to be easily explained by the accompanying diagram (Fig. 4). 
Still on the downthrow side of the great fault of Port Phillip 
and on the opposite (west) side of that great inlet, are situated 
Altona Bay and Newport, at which places deep shafts have been put 
down, extending into Balcombian strata, and affording a continuous 
series from surface level. These bores reveal several seams of lignite 
or brown coal, one of which is 74 feet in thickness. Unfortunately, 
no detailed and scientific 
account of the strata I via'.xrocene 
passed through in these 
bores is available, but the 
data given by the engineers 
show that the beds are 
very variable in character, 
and a general idea may be 
gained as to their nature. 
The bed-rock, probably an 
Ordovician slate (Fig. 5), 
was struck in Bore No. 1 
at Altona Bay (Sect. VII., 
parish of Truganina) at 
656 ft. 3 in., and pene- 
trated a thickness of 
238 ft. 4 in.* Above this 
bed-rock there is a variable 
series of gravelly sands 
and lignitiferous clays, 
with occasional seams 
containing broken shells, 
which amounts to a thick- 
ness of 235 ft. 6 in. Above 
this, again, occurs a brown 
coal bed 70 ft. 5 in. thick. 
The succeeding calcareous 
clays and limestones, as 
well as those just men- 
tioned, are of Balcombian 
age, and have yielded an 
extensive fauna, chiefly of 
mollusca, which have been listed by Messrs. Thiele and Grant, f 
and more recently by Messrs. Dennant and Kitson.t The latter list 
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* Ann. Rep, Dept. Mines, Viet., for 1902 (1903), p. 09. 
f Proc. Roy. Soc. Viet., vol. xiv., pt. 1, 1901, p. 145. 
;t Rec. Geol. Surv. Viet., vol. 1, pt. 2, 1903. 
