178 



DR. C. T. TRECHMAXX OX 



[vol. Ixxiii, 



till they form a flat svncline with an axis oriented north-west and 

 .south-east. The result is that the outcrop of the beds bends 

 round, and becomes much wider on the south-western side. In 

 consequence, the Triassic rocks occupy the northern and western 

 fringes of the hills ; while the inner and less accessible part of the 

 range, together with the southern and south-western portion, is 

 oi^cupied by the much less strongly inclined Jurassic deposits. 



The great mass of greywackes and conglomerates, called the 

 Kaihiku Series, estimated as 6600 feet thick, occupies the nortliern 

 fringe. The thin fossiliferous band, which occurs 4000 feet 

 above the lowest beds seen in the district, crops out at various 

 points as a continuous bed. It is seen in a railwa3^-cutting a mile 

 south of Caroline Station, and at East Peak, whence it extends 

 ■eastwards in the direction of the Kaihiku Grorge, from which it 

 takes its name, and finally reaches the coast at Nugget Point. 



I visited various localities in the Hokonuis in compan}^ with 

 Prof. Marshall, but most of our collecting was done at a spot, 

 previously known to Prof. Marshall, in the vallc}^ of the Otamita 

 Stream some distance west of East Peak. This stream, according 

 to the map published by Cox & McKay, flows eastwards in the flrst 

 part of its course approximately down the junction of the Otapiii 

 and Upper Wairoa Series. It then turns northwards and cuts across 

 the strike of the Lower Wairoa and Kaihiku Series, ultimately 

 joining the Mataura. The section that we observed on both banks 

 of the Otamiti Stream is as follows : — 



Beds. 



Approximate 



thickness in 



feet. 



Fossils. Age. 



\ 



a. Massive felspathic grits 

 and sandstones. 



20 



Fragment of Pinacoce- 

 ras, alate Spiriferinse. 



1 p 



J NORIC. 



b. Felspathic sandstones 



interbedded with shaly 

 bands. 



c. A massive bed of dark, 



hard, but fissile crumb- 

 ling shale, with concre- 

 tionary nodules in its 

 lower part. 



d. Felspathic sandstones 



and argillites. 



e. Dark -grey rusty shales 



with small rounded py- 

 rite nodules, and bands 

 of felspathic sandstone 

 weathering in spheroidal 

 masses. 



/. Dark slaty shales. 



I 



20 

 25 



p 



100 



? 



Na^itili. Arcestes, Dis-\ 

 cophyllites, Halohia] 

 hoclistetten, etc. 



Halohia hochstetteri 

 and many other well- 

 preserved fossils, 

 Nautili. Discophyl-\ 

 lites. 



1 



Pleurop'horus, Spiri- 

 ferina, etc., badly 

 preserved. 



Halohia zitteli var. 

 zealandica, Spirigera^ 

 manzavinioides, Spi-'l 

 rifevinse, Conularia,\ 

 and many other fos- 

 sils. 



Full of Mytilus pro-^ 

 blematicus. 1 ^ 



i 



1 



1 



1 



y Carnic. 



. i 



