RELATIONSHIPS OP THE AUSTRALIAN CAINOZOIC SYSTEM. 
upon the polyzoal rock is a bed of older basalt, and above this again 
a bed of pink limestone, thoroughly indurated and containing 
shells of littoral species, such as the Cerithium before-named and 
Haliotis. Upon this lies another bed of basalt, covered by a rubbly 
polyzoal rock. 
At 100 feet below Maude township, on the road to the bridge 
(Knight’s-bridge), the following section was Seen (Fig. 12) 
Thickness 
in feet by 
aneroid. 
Surface deposits passing downwards into limestone . . 
Basalt, near top of which is an intercalated band of 
hard limestone, followed by (?) polyzoal rock, 
probably masked by talus 
Siliceous grit 
Ordovician slate 
100 
200 
40 
40 
Close to the basalt an excavation at the side of this same road 
showed 
ft. in. 
Rubbly polyzoal limestone . . . . ..09 
Current beckled polyzoal limestone resting on an 
eroded surface of basalt . . . . ..30 
This basalt is only about 18 inches in thickness. Under this 
basalt occurs the hard pink limestone (WTM4) of the littoral type 
before mentioned. 
The above section supports the survey interpretation of these 
beds by showing that in some localities there was a second somewhat 
feeble effusion of the older basalt. It also proves the extremely 
variable thickness of the basalt and polyzoal limestone. In other 
sections not far distant the second flow is absent, as shown by the 
data given by Hall and Pritchard. 
E. — The Hamilton District. 
Two divisions of the Cainozoic beds in this area have been clearly 
defined by the work of Messrs. Tate, Dennant, Hall and Pritchard. 
These beds are revealed by the erosion of the Grange Burn and the 
Muddy Creek. The lower beds at Muddy Creek are correctly 
correlated with the Mornington beds (Balcombian) ; whilst the 
upper series, seen at Grange Burn and MacDonald’s, belong to the 
same geological horizon as the Beaumaris and Jemmy’s Point beds 
(Kalimnan). 
There is, however, a third and intermediate series, which has to 
be intercalated between these beds, but which up to the present 
has been entirely overlooked, in relation to its stratigraphical 
importance and position. In all probability this was a neglected 
factor on account of its great variability, even in the same district. 
I have already postulated the middle position of the Janjukian 
[ 42 ] 
