14 Chapman and Gabriel : SJteli-bed. 



2. — That since the old tluue-rock and old swamp deposits con- 

 tain extinct forms of marsupial remains they presumably l:)elong 

 to the early Pleistocene. 



."3. — The evidence of the shells from beneath the Warrnambool 

 tuffs shows the fauna to have a geologically recent aspect, but with 

 varietal modifications of the species indicating different geographical 

 features from that now prevailing in the locality, a strong 

 estuarine character antedating the re-juvenation of the present 

 river-system. This ancient estuarine feature is further emphasised 

 by the fact of the prevalence of a wide lava-flow of newer basalt 

 extending down to the present shore-line at Port Fairy and beyond, 

 pointing to the infilling of an ancient river delta which, originally 

 of great extent, embraced the Warrnambool-Portland area. 



4. — It may therefore be postulated that the volcanic tuffs of the 

 Tower Hill series were ejected between early Pleistocene and fairly 

 modern times, that is, in late Pleistocene or Holocene, or, using 

 European terms, in early prehistoric times. Compared with the more 

 mature physiogiaphic features shown by the newer volcanic lava flows, 

 these tuffs represent one of the last stages of the volcanic outburst in 

 Victoria. 



