165 



Kawau Island Beds. 



The Kawau Island deposits contain only extinct species, and have been 

 erroneously grouped with the newer-tertiary formation, by Hochstetter, from 

 the species having been mixed with. more modern form's from a littoral deposit 

 at Cape Rodney. 



A list of the Cape Rodney shells is given separately ; all of them being 

 extinct species. 



Awatere and Motanau Beds (Upper Tertiary). 

 The Awatere and Motanau clays are undoubtedly of the same age, and it 

 is very probable, when further examined over the whole area, will be naturally 

 grouped in three subdivisions. At Motanau three beds can be distinctly 

 recognized : first, an upper sandy bed, containing the most common shells of 

 the adjacent coasts ; second, a middle blue clay bed, containing probably fifty 

 species, nine-tenths of which are identical with those of the blue clay at 

 Wanganui ; these upper and middle beds lie conformable, and have, evidently, 

 like those at Wanganui, been accumulated on their breeding grounds, on quiet 

 sea bottoms. Not so the third, or lower, blue clay bed, found inland near its 

 outcrop. It exhibits masses of concreted broken shells, the result of wave 

 action on an ancient sea beach. The proportion of extinct species in this 

 series is very small, and those chiefly miocene fossils, of the lower bed, such as 

 Cucullsea. 



SUMMARY. 



By a comparison of the fossils collected in the different districts, with 

 those of Wanganui ■ taken as a standard — as being the most complete — the 

 evidence is conclusive of the sameness of the whole, with the exception of the 

 Kawau beds, as a reference to the columns will show. 



The formation must be divided into three groups : an upper, a middle, 

 and a lower ; nearly every genus of the upper and middle beds still existing 

 on the adjacent coasts. 



Napier. 



Ostrea— 2 sp., Mytilus, Pecten— -3 sp., Crepidula, Calyptraea, Yenus, 

 Pectunculus. Total, 10 sp. : recent 7, extinct 3. 



Cape Rodney. 

 Haliotis, Cardium, Scalaria, Pusus— 2 sp., Turritella, Teredo, Pectunculus, 

 Pecten— 2 sp., Rhynchonella, Turbo, Ostrea. Total, 14 sp. : recent 13, 

 extinct 1. 



Kawau. 



Ostrea, Turritella, Turbo, Crassitella, Natica, Pectunculus. Total, 6 sp., 

 all extinct. 



HOKITIKA. 



Fusus— 2 sp., Dentalium, Voluta — 2 .sp., Natica, Limopsis, Trophon, 

 Turritella, Leda, Pecten, Ancillaria, Cassis, Yenus, Pectunculus. Total, 15 sp. : 

 recent 13, extinct 2. 



Waipara. 



Fusus— 2 sp., Natica, Turritella— 2 sp., Scalaria— 2 sp., Struthiolaria— 

 2 sp., Crepidula — 2 sp., Calyptnea, Yoluta, Cucullgea— 4 sp., Dentalium, 

 Echinite— 3 sp., Trochus, Shark's tooth, Crania, Pectunculus — 2 sp., 

 Waldheimia — 4 sp., Ostrea, Yenericardia, Myodora, Pecten — 5 sp., Yenus — 

 2 sp., Mactra, Mytilus, Modiola, Lucina, Panopjea, Cytherea, Artemis, Lima. 

 Total, 48 sp. : recent 27, extinct 21. 



