The Schists of the Humboldt, Southern Olivine And Barrier Ranges And The Upper Dart-Matukituki Region. These ranges from which the bulk of our rock specimens were collected consist almost entirely of schists, the macroscopic features of which were well described by Park, who distinguished green schist, grey pyritic quartz-schists and softer micaceous schists distributed throughout the series at irregular intervals, the whole complex showing many variations in mineral composition. He noted that they have been subjected to intense lateral pressure and locally show a strong plication. The strike of the schistosity is almost uniformly meridional, and the dip on the western side of the Humboldt Range is nearly vertical or even very steeply inclined to the West, where it is cut off against the peridotites by an almost vertical fault. On the eastern side of the range the dip of the schistosity is much gentler, and is usually directed westerly at angles less than 40°, or even 10°. The same gentle westerly dip is seen in the Forbes Range further east (Healy and Willett, 1938). In the main range between the Dart and the Matukituki, the rocks still strike meridionally and are granular chloritic schists containing magnetite still dipping west and overlying the soft mica-schist further east. At the far source of the latter river a thick band of compact green rock dipping west at an angle of 45° is overlain by soft mica schists, which latter weathering rapidly leave the green rock as a smooth sloping surface on one side of the approach to Hector's Col (Locality 42). Using the criteria stated by Hutton and Turner (1936) and Turner (1938) for the recognition of the metamorphic grade, the rocks of Mount Nox in the Humboldt Range appear to belong to subzone Chl. 2, while from Turner's (1935) descriptions those near Mounts Momus and Somnus appear to be transitional between the subzones Chl. 2 and Chl. 1. The limit of subzone Chl. 2 probably extends to about Mount Chaos. The remainder of the Humboldt Range, the Forbes Range and eastern slopes of the Richardson Range are in subzone Chl. 3, while the rocks of the Olivine and Barrier Ranges, the main portion of the Richardson Range and the regions further north and east (cf. Hutton and Turner, 1936) are characteristic of subzone Chl. 4. Representative Rock Types: Subzones Chl. 1–2. The rocks described by Turner (1936) include the “blue slate” (1989) and partially sheared keratophyre-spilite tuff (1988) from near Mount Somnus, and the phyllite (2077) [extremely like that (4860) from Homer's Saddle, Lower Hollyford described above], the slightly sheared greywackes (1997–8, 2060–2) and the fine-grained quartz-albite-calcite-semischist (2065). The rocks on Mount Nox (Locality 30) include (4754) a grey unfoliated semi-schist in which the quartz-albite mosaic has a grain-size rarely larger than 0.01 mm. though containing larger strained relict grains. Pale chlorite and sericite not markedly oriented are present—sometimes clouded with dusty epidote and rarely prisms of tourmaline up to 0.2 mm. long. A still more finely granular example (4755) shows an alternation of