432 NOTES ON THE MUELLER GLACIER, NEW ZEALAND, 



mentioned, as forming Sealy Peak and underlying the greywackes 

 and slates unconformably. In his report he says that the two 

 formations appear to be unconformable, but he saw no line of 

 junction, and bases his opinion on a difference in the strike of the 

 two ; this difference however, according to his section, is slight. 1 

 also was unable to examine a junction between the two sets of rocks 

 (although such will easily be found in the Sealy Kange), but on the 

 centre of the Mueller Glacier I found a large block, some 8 feet 

 cube, which was composed partly of greywacke and partly of 

 phyllite, the one passing insensibly into the other. The phyllite 

 was largely charged with quartz folise, some of which passed as 

 veins into the unaltered greywacke. From this I conclude that 

 the phyllites and quartz schists belong to the same formation as 

 the greywackes and slates, and have been locally produced by 

 pressure metamorphism ; at the same time it must be remembered 

 that these schists occupy an anticlinal — as will presently be shewn 

 — and are therefore just in the position where an older formation 

 might be expected to occur. 



Sir J. von Haast examined the western slopes of the Moorhouse 

 Range in 1868 and found it to consist of true foliated schists — 

 mica and chlorite schists resting on gneiss — but none of these 

 rocks ai'e found on the eastern side. Mr. Green found the very 

 topmost rock of Mount Cook, "just appearing below the cap of 

 ice which forms the summit," to be quartzite ; which he thinks 

 belongs to the metamorphic formation underlying the Maitai 

 Series* 



A lode of iron pyrites in quartz and quartz-schist runs along 

 the north end of the Sealy Range opposite the Hermitage under 

 Huddleston Peak. It appears to be parallel to the bedding. By 

 its decomposition it has stained many of the sandstones below it 

 of a rust-red colour. 



In the gorge of Black-birch Creek, at the north-east end of the 

 Sealy Range, the dip is 75° E.S.E., and at Kea Point, at the north- 



* Proc. R. Geographical Soc. of London, Feb. 1884, p. 8. 



