194 



On Deep-seated Eocene Strata, in the 

 Croydon and other Bores. 



By Professor Ralph Tate. 



[Read September 6, 1898.] 



I. Croydon Bore (No. 2). 



In the Trans. Roy. Soc, S. Aust., XTII., p. 188, 1890, I have 

 given an account of the strata passed through in the Croydon- 

 bore, which attained a depth of 800 feet below the surface. 

 Therein the chief point of interest was the recognition of the 

 Pliocene beds of the Dry Creek-bore, the fossiliferous develop- 

 ment of which extended from 395 to 605 feet. At the time of 

 the publica.tion of my paper the boring was abandoned; sub- 

 sequently a second bore-hole was commenced alongside the first, 

 and was finally abandoned, 17/6/'93, after attaining a depth of 

 2,296 feet. The geological conditions revealed in the additional 

 1,496 feet have not yet been described ; though the Conservator 

 of Water has furnished details of thickness and description of 

 strata to accompany the Engineer-in-Chief's report for the year 

 ending June 30, 1893. Mr. Jones has obligingly placed to my 

 use, for the present object, all the bore material preserved in his 

 department. 



Older Pliocene. 



At from 470-475 in the Croydon-bores (No. 1 and No. 2) the 

 assemblage of fossils was the same as in the Dry Creek-bore at 

 about 400 feet, though the actual number of species was 

 relatively small. 



Fossils were again met with at 603-606 and at 705-715; the 

 assemblage consisting of the larger species, which also occur at 

 the highest level in the Croydon and Dry Creek-bores, and if 

 viewed by themselves would have been pronounced Miocene. 

 However, as they occur in association with an undoubted Pliocene 

 fauna, they must be regarded as survivals from Miocene times. 



