Pleistocene. 
95 
Pleistocene. 
Alluvial Flats may be seen on the banks of the 
Nepean, evidently formed by flood waters, never 
reached by the highest floods of the present time. 
They are believed to be of the Pleistocene age. In this 
connection it is interesting to note that geologists are 
Fig. 24 . — Trcmcmotus Maideni 1 Kth. fil. A fossil shell from the 
Hawkesbury Sandstone, Biloela, Sydney. 
fairly agreed that the rainfall of the Pleistocene period 
in Australia was much greater than it is now. The 
existence of the gigantic IHprotodon which roamed in 
herds over the plains of the interior is one proof of 
this. They could hardly have existed in such numbers, 
without a luxuriant vegetation, such as only a semi- 
tropical and very moist climate would make possible. 
1. Ann. Rep. Dept. Mines, N. S. Wales, I88C, Appendix N., p. 174 
