41 



Tlie combined section agrees in general features witli tliat o£ 

 the coast cliffs of Aldinga Bay (for notice of which, see Trans, 

 of this Society, vol. i., p. 121, 1878). The series of the Older 

 Tertiary strata in the Adelaide basin may be summarised as 

 follows : — 



A. Estuarine or Lacustrine clay, exceeding 50 feet. 



B. Marine — total thickness, 197 feet. 



(a) Calciferous sandstones, with oyster banks. 

 (h) Sandy and calcareous clays, with argillaceous lime- 

 stones, chiefly in the lower part, 

 (c) Grlauconitic limestones and sands, &c. 

 c. Lacustrine and Estuarine clays and sands, with carbona- 

 ceous debris — total thickness, 142 feet. 

 Series a at the Government-House quarry has yielded very 

 few species of fossils in a state for critical determination, as 

 with the exception of oysters and pecteus, their tests have been 

 removed. Nevertheless, these beds are on the same palseontological 

 horizon as similar rocks forming the uppermost fossiliferous 

 strata in the Aldinga and E. Murray Cliffs, which I have else- 

 where (Trans, of this Soc, vol. L, p. 121, and vol. IL, p. liii., 

 et seq.) named the Upper Aldinga Series and the Upper Mur- 

 ravin Series respectively. 



List of Species. 



Nautilus sp. : related to N. pompilms, but of large pro- 

 portions. 



Cassis textilis, Tate. 



Haliotis sp. ; Bulla sp. 



Ostrea cf. edulis, Linnc. 



Pecten spondyloides, Tate. 



Pecten asperrimus, Lamarck, var. 



Pecten subbifrons, Tate. 



Nucula tumida, Woods. 



Pectunculus McCoyi, Johnston . 



Cardium. 



Placotrochus deltoideus, Duncan. 



Series h corresponds with the Middle Aldinga Beds, 

 which form the main mass of Blanche Point Cliff. As in both, 

 TurriteUa AlrUngce occurs in great profusion. 



Not many fossils have yet been extracted from the bore- 

 cores, so that a palajontological analysis of series h and c is 

 postponed. 



The glauconitic limestone which forms the base of the fos- 

 siliferous series at Aldinga differs lithologically somewhat 

 from its probable equivalents in the Adelaide section, and the 

 rarity in the latter of echinoderms and palliobranchs is 

 another point of dissimilarity. 



