262 Geology of 



dip now to the west-north-west at an angle of 65 degrees, so that here 

 the occurrence of an anticlinal is proved. Still more to the east, at 

 Browning's Pass, the dip alters again to south-east, 70 to 80 degrees ; 

 but near the summit of the central axis, westerly dips were again ob- 

 served. Rocks of the same character, and in similar stratigraphical 

 positions, occur at the head of the more southern branches of the 

 Rakaia, and near the glacier sources of the Rangitata ; but in those 

 localities, the uppermost portion only of the formation under con- 

 sideration appears, the interlaminationy of quartz in the clay-slates 

 (Phyllites), being either absent or appearing in a few instances only* 

 Strata, rich in quartz, are either represented by felstones, or by a 

 semi-crystalline sandstone, in which no particles of slates are enclosed. 



On the western side of the G-odley glacier altered sedimentary rocks 

 occur, and the western tributaries of the Great Tasman glacier bring 

 down blocks of rock from the very summits of the Southern Alps, 

 possessing a similar texture. In the Sealy range, south of Mount 

 Cook, and on the western banks of the Tasman river, we meet with 

 foliated altered quartzose schists, argillaceous schists with numerous 

 quartz veins, green calcareous phyllites, true clay-slates or phyllites, 

 some of them passing into gneissoid schists, generally having a westerly 

 dip of 70 to 75 degrees. In the upper course of the two main 

 branches of the Hopkins river, which falls into Lake Ohau, they form 

 the bulk of the ranges where I have traced all the rocks hitherto de- 

 scribed. Some of the phyllites are full of lenticular concretions of" 

 quartz ; in others, the quartz is more regularly interlaminated in small 

 layers, of a few lines in thickness. They vary much in strike and dip, 

 but when all the readings are put together, they prove that at least 

 two anticlinals and synclinals exist, disappearing at laBt at Mount 

 Hooker, where they are overlaid by newer rocks. Another portion 

 of the country where this formation can be well studied, is situated in 

 the basin of the Makaroa river. Here, on the northern or left bank of 

 the ^Vilkin river, it appears to overlie conformably the gneiss granite, 

 zone, occuring round Lake 'Wanaka. The beds representing the 

 Waihao formation, here consist of micaceous or fine grained, light 

 coloured phyllites, often full of lamina? of quartz. They are often, 

 much contorted, and generally have a dip of between 60 and 80 

 degrees, varying from north-east to south-west. In crossing Haast 

 Pass, and following the course of the River Haast, we travel upon 

 them for a considerable distance, and are able to observe how the 

 easterly dip changes to a westerly one; and that, after another 



