part 3] 



THE TllIAS or NEW ZEALAND. 



177 



Spirigera resembling- 8p. IcaihiJcu- 



ana, sp. nov. 

 Mentzeliopsis sp. of unusually large 



size. 

 Large alate Spiriferinse and a small 



form resembling- Spiriferina fra- 



gilis Schlotheim. 

 Large Dielasma. 



conglomerate. The fossiliferous rocks are associated with altered 

 sandstones, and follow the jDhyllites, quartzites, etc. (known as the 

 Kurow Schists) in direct stratigraphical succession. At the foot of 

 the mountain the dip is very high, and at the fossiliferous out- 

 crop it is about 60°. Prof. Park ^ imys that the thickness of the 

 strata exposed in the section is not less than 10,000 feet, and he 

 gives a careful enumeration of these metamorphic and semi-meta- 

 morphic rocks. His attribution, however, of a Permo-Carboniferous 

 age to the fossils is erroneous, as they are all Triassic, and the 

 majority belong (as do those at Mount Potts) to the Kaihiku 

 Series. I examined the series in the Geological Surve}^ Collec- 

 tion, and also a collection which Prof. Marshall made. Many of 

 the forms attain an unusually large size, but are much crushed 

 and distorted : they occur in a fissile slaty argillite or greywacke. 

 I identified the following forms : — 



A crushed Nautilid. 



Patella (?), crushed. 



Pleurotomaria sp. and another small 

 gasteropod. 



Lima sp. 



Part of a large indeterminate bi- 

 valve. 



Many small specimens of Megalodon 

 cf. glohularis, sp. nov. in a coarse, 

 gritty felspathic sandstone. 



There is no trace in this fauna of Hectoria, Halohia, Mytilus, 

 or JPseudomonotis. 



It is quite certain that the slaty shales contain the Kaihiku 

 fauna, and are of late Middle or early Upper Triassic age, while the 

 Megalodon-\\k.Q bivalves in the higher conglomerate-bed suggest 

 the presence of part of the Carnic horizon below the Mytilus- 

 prohlematicus Bed. 



Hokonui Hills. 



The Hokonui Kanges consist of a series of conformable Triassic 

 and Jurassic rocks. On the north-east the}^ are bounded by the 

 Waimea Plains and the Waimea Biver, a tributary of the Mataura, 

 and on the south-west and south-east by the Makerewa Flats and 

 the Oreti Kiver. Their structure was investigated b}^ S. H. Cox ^ 

 and A. McKay ^ in 1878. The hills rise to a height of about 

 2500 feet, and are part of a range extending from the Takitimu 

 Mountains to Nugget Point on the south-eastern coast of Otago. 

 The Government surveyors estimated the thickness of the strata 

 at 21,000 feet or more. The structure is roughly that of a trough, 

 of which only the northern and western edges are exposed. The 

 axis follows roughly a south-easterly trend at its western end and 

 a nearly easterly trend at the eastern end. The beds along the 

 northern and north-eastern fringe of the hills stand nearly vertical, 

 while on the southern and western side the dip rapidly decreases- 



^ Bibliography, 38. 



- Bibliograpby, 9. 



•^ Bibliography, 27. 



