272 



We have noted further occurrences of Miocene in Lloyd's 

 Section 263, Dalrymple, 3J miles north-west of Yorketown, 

 and in a well in Cope's section (Section 47, Moorowie). 

 Both these deposits consisted of a hard white sub-crystalline 

 limestone, containing: Pecten sub-bifrons, Pecten palmi2:)es, 

 Pccten consohrinus, Pecten anti-australis, Limatula Jeffrey- 

 siana, Ostrea areuicola, Placunanomia ione. In the latter 

 case the Miocene beds are 11 ft. in thickness, and rest directly 

 on the glacial clay. Similar deposits, probably of the same 

 age, were also observed at Kangaroo Flat, Section 35, Mooro- 

 wie, and at Pink Lake, M.L., 266, Melville. 



Eocene. 



Rocks of this age are extensively represented between Yorke- 

 town and Salt Creek by beds of polyzoal limestone similar to 

 those of Wool Bay both in color and texture, the upper por- 

 tions being a light yellow, which changes to a dark red towaa'ds 

 the base of the formation. This deposit was also noted in w^ells 

 in the following sections : 



1. Section 261s. Melville. 32 ft. to water. Polyzoal lime- 

 stone. 



2. Section 259, Melville. 



3. Section 267, Melville. 80 ft. to water. Polyzoal lime- 

 stone. 



4. Boundary between Sections 267-268, Melville. 88 ft. 

 Polyzoal limestone. 27 ft. White glacial sand to water. 



5. Section 273, Melville. 36 ft. to water. Polyzoal lime- 

 stone. 



6. Section 80, Dalrjnnple. 40 ft. Polyzoal limestone. 5 

 ft. Conglomerate to water. 



The fact that the color of the polyzoal limestone of W^ool 

 Bay and the above localities shows similar variations at variouo 

 depths, the characteristic fossils of each being identical would 

 seem to show that these are all portions of one and the same 

 deposit. That this is the case is clearly demonstrated by 

 numerous well sections taken at points intermediate between 

 Yorketown and the east coast. 



It will be seen from the sketch section (Plate vii.) that the 

 Eocene beds occupy an eroded hollow in the glacial clay some 

 80 ft. in depth, showing that a considerable period of time must 

 have elapsed between the laying down of the glacial clay and 

 deposition of the Eocene limestones, esipecially as the land 

 surface must have undergone depression to an extent of at least 

 80 ft. before this could take place. 



