Marshall. — Nephelinite Rocks in New Zealand. 



305 



form in it. The prisms are of considerable size, as much as 1 mm. long 

 and 0-18 mm. in diameter. The prisms are not numerous in the olivine 

 or ilmenite, but are abundant in the younger constituents. Ilmenite in 



ca schists, Maitai I 

 ystem (Trias Jura). I 



~^x[Oamaru system. 

 Eocene-miocene. 



a d. i Glacial moraine 

 ' Pleistocene. 



Nephelinite. 

 Scale : 1 inch = 8 miles. 



CLARENDONk"^ - 



_s Cx v 



WC<^ 



v^->vv 



•v> 



mrawmnw**,* 



Geological Structure of Part of East Otago. 



grains of T5mm. in diameter is rather frequent, and displays its usual 

 structure. Olivine is fairly common in crystals as much as 6 mm. in 

 diameter, and is somewhat serpentinized. The augite is a titaniferous 



