532 Transactions. — Geology. 



3. Pecten vellicata, Hutton. 



4. Pseudamussium huttoni, Park. 



5. Magellania sufflata, Hutton. 



6. Terebratula tayloriana, Colenso. 



7. Terebratula oaviarutica, Boehm. 



8. Terebratulina suessi, Zittel. 



These fossils indicate the upper horizon of the Mount 

 Brown beds. 



Kakahu Bush, west of Geraldine. 



Stratigraphy. 



Before reaching Kakahu Bush the Oamaru Stone and the 

 underlying sandstones and sandy-clay beds are repeated by a 

 fault. Sir Julius von Haast' :: placed this fault in such a posi- 

 tion as to make certain sandy clays appear to overlie the 

 Waitaki Stone. Mr. McKayf followed him in this in 1876, 

 and so also did the writer] in 1885, no doubt having at that 

 time been expressed as to the stratigraphical position of the 

 Pareora fauna to the Waitaki Stone. 



The Geological Survey maintains that the Pareora fauna 

 occurs in beds overlying the Waitaki Stone, while Captain 

 Hutton contends that the sandy clays and greensands believed 

 by the Survey to be below the Waitaki Stone contain the 

 Pareora fauna. The Survey admits the inferior position of the 

 fossiliferous sandstones overlying the coal at Kakahu Bush, 

 but does not acknowledge that the fauna is Pareora. Cap- 

 tain Hutton, while admitting the Pareora facies of the fauna 

 in the Kakahu Bush beds, contends that the beds which 

 contain it do not underlie the Waitaki Stone, but occur in 

 a narrow valley eroded in that rock. It does not appear, 

 however, that he has personally examined the Kakahu 

 section. 



As it was important to determine the stratigraphical 

 relationships of the beds admitted by Captain Hutton to 

 contain a Pareora fauna, I devoted my time to an- exami- 

 nation of the Kakahu Bush section, where all the mem- 

 bers of the Oamaru series are exposed in vertical succes- 

 sion, from the coal-beds, resting upon the Palaeozoic rocks, 

 up to the Waitaki Stone. The section exposed there is as 

 follows : — 



* Haast, " Geology of Canterbury and Westland," 187G, p. 310. 

 f McKay, Reports of Geol. Expls., 1876-77, p. 51. 

 J Park, Reports of Geol. Expls., 1885, p. 170. 



