33 



Thougli there is no palaeontological evidence by whicli to 

 correlate the sands and loams forming the cliffs of the upper 

 section of the Lower Murray Eiver with the Drifts charac- 

 terised by the Pliocene marsupials; yet the physical conditions 

 under which each seem to have been accumulated point to 

 contemporaneity. 



Sections of the Oldek Tertiiet Deposits of the LowEit 

 Section of the Eiyee. 



In a paper Notes on the " Correlation of the Coral-bearino- 

 strata of South Australia,"* I presented a generalized section 

 of the strata in the cliffs of the Eiver Murray, in which the 

 following subdivisions in descending were adopted : — Lacus- 

 trine, Upper (Marine) Murravian, Middle (Marine) Murra- 

 vian, and Lower (Marine) Murravian. In the following year, 

 in my presidential address, " Outlines of South Australian 

 Geology, "t these views are repeated, and are accompanied by a 

 numerical statement as regards the community of species be- 

 tween the Upper Murravian and the Muddy Creek deposits. 

 ^Further studies at the section which supplied the chief material 

 for the comparison have convinced me that my Upper Murra- 

 vian should be restricted to the oyster banks,:|: and that the 

 underlying beds, rich in gastropods, merge into the main mass 

 of the Middle Murravian. This re-arrangement, which places 

 the Muddy Creek beds on the horizon of the Middle Murra- 

 vian, does not materially affect the deductions drawn from my 

 survey of the census of the fauna at each of the two localities. 



I may best describe the strata of the Older Tertiary cliffs 

 by means of an illustrative 



Section taken near Glenfoeslan, foue miles noeth 



FEOM BlANCHETOWN. 



Lacustrine. ft. in. 



1. Travertine cover and thin-bedded sandy limestone 7 5 



2. Eed and blue clay ... ... ... ... ... 5 7 



3. Compact earthy argillaceous limestone ... ... 5 3 



4. Friable sandstone, with occasional layers of coarse 



sand ... ... ... ... ... ... 5 5 



Upper Murravian. 



5. Oyster-bank 10 



6. Friable sandstone, with fragments of shells and 



cidaris ... ... ... ... ... ... 8 9 



7. Oyster-bank 2 6 



8. Eed and yellow clayey sand, with scattered oysters 2 4 



* Trans. Koy. Soc. S. Aust., vol. I., p. 120 ; 1878. 

 fOp. cit., vol. n., p. liii. ; 1879. 

 \ Poste p. 



