lviii. 



The living species present in these beds are : — 

 Tebebbatella Cumingiana, Davidson. Very rare in the 



middle beds of the Aldinga section, but plentiful in the 



Lower Murravian, and in the Mount Gambier beds. 

 Elabelluji distinctum, Ed. & H. Common. 

 Limopsis ATTBiTA, Sassi. The Aldinga fossils are identical 



with the New Zealand and Chilian Eocene form, L. 



insoluta, Sow., which may be synonymic with the above. 

 E:mabginula dilecta, Angas. An Emarginula from Aldinga 



is doubtfully referable to JE. tran&enna, Woods, of the 



Table Cape Miocene, which may possibly prove to be 



the recent South Australian E. dilecta. 

 Accepting the above determinations, the proportion of living 

 to extinct forms in the Lower Aldinga series is, expressed by 

 percentage number, 3'5. And if the species of the Middle and 

 Lower Murravian and of their equivalents in the South-East 

 be similarly compared, I am confident that the percentage of 

 living species will not be materially increased, though a larger 

 percentage of forms will be found to pass from the middle to 

 the upper series. But if we confine our examination to the 

 fossils of the glauconitic limestones at Aldinga and of the 

 contemporaneous chalk rock of the Bunda cliffs, we not only 

 find a larger number of peculiar genera and others alien to the 

 recent Australian fauna, but encounter some points of contact 

 with the Eocene fauna of New Zealand. Regarding the last 

 particular I can speak with confidence as to the identity of six 

 of our fossils with those from the Upper Eocene or Ototara 

 group of New Zealand, but in the absence of actual specimens 

 for comparison I hesitate to refer several others to species from 

 the same deposit. 



The obviously higher antiquity of the fauna of the glau- 

 conitic limestones at Aldinga necessitates the separation of our 

 Older Tertiaries into two distinct groups — the one referable 

 to the Eocene, the other to the Miocene ; and it may be well, 

 for the present, to regard the Upper Murravian series as 

 Upper Miocene, and the middle and lower portions as Lower 

 Miocene, restricting the Eocene as indicated above. 



Upland Miocene and Desebt Sandstone. 



There succeed in conformable position to the uppermost 

 marine beds at Aldinga, at Adelaide, and along the banks of 

 the Lower Murray River, unfossiliferous clays, which from the 

 fact of their gradual passage into beds presenting unmistakable 

 evidence of fluviatile origin, may be regarded as estuarine. 



The shore line of the Miocene sea is distinctly traceable at a 

 few points in the Aldinga Basin. Passing inland from the 

 mouth of the Onkaparinga, the marine beds, which form the 



