494 Transactions. — Geology. 



I have used the latter name as the more appropriate of the 

 two. The Mount Brown, Mount Donald, Hutchinson Quarry, 

 and Kakanui Eiver beds all belong to the same horizon. 



In the Waipara district the Cretaceous, Lower and Younger 

 Tertiaries are very fully developed, richly fossiliferous, and 

 exposed in many magnificent sections which are easily ac- 

 cessible. The district possesses a combination of favourable 

 conditions not found elsewhere, and for this reason it must 

 be regarded as a classic locality of rare geologic importance. 



Distinctive Fauna of Oamaru Series. 



The fossils which distinguish the three principal horizons 

 of the Oamaru series, as now defined by me, are as follows : — 



Waitahi Stone. 



Meoma craivforcli, Hutton. 

 Cirsotrema browni, Zittel. 

 Pseudamussium huttoni* Park. 

 Magellania novara, Jhering. 



• 

 Mount Brown Beds. 



Kckenodon onomata, Hector. 

 Cassidaria senex, Hutton. 

 Cirsotrema lyrata, Zittel. 

 Cirsotrema broioni, Zittel. 

 Pecten hutchinsoni, Hector. 

 Pecten beethami. Hutton. 

 Pecten hochstetteri. Zittel. 

 Pecten fischeri, Zittel. 

 Pecten jJolymorphoid e.s , Zittel. 

 Pecten williamsoni, Zittel. 

 Amussium zitteli, Hutton. 

 Pseudamussium huttoni, Park. 

 Plagiostoma Icevigata, Hutton. 

 Lima palaeta, Hutton. 

 Magellania parki, Hutton. 

 Magellania novara, Jhering. 

 Tercbratella gauiteri, Morris. 

 Terebratella oamarutica, Boehm. 

 Terebratula tayloriana, Colenso. 



* For more than thirty years this beautiful pecten, which is found in 

 the Oamaru series all ove'r New Zealand, has been erroneously known to 

 New Zealand geologists as Pecten hochstetteri, Zittel. It is smooth on 

 both valves, and easily distinguished from P. hochstetteri, which is smooth 

 on one valve and marked with fine radiating ribs on the other. Mature 

 examples of the latter are about half the size of mature shells of Psetld- 

 amussium huttoni. 



