In the Kwoiek Needle-Nahatlatch River area, south of Lytton, sillimanite, kyanite, garnet and andalusite are present in northwest trending phyllites and schists which occur in fault contact with Permian(?) to Lower Cretaceous Bridge River Complex (Group) rocks. These phyllites and schists are reported to occur as roof pendants or screens in the Late Cretaceous Scuzzy pluton (Geological Survey of Canada Memoir 262; Geological Society of America Bulletin 80; American Journal of Science, Volume 267). The schists may be equivalents of the Settler Schist, exposed to the south.

The garnet and aluminosilicate minerals are clearly products of contact metamorphism related to the emplacement of the Scuzzy pluton, and isograds marking the first appearance of the various aluminosilicate polymorphs can locally be mapped around intrusions (Geological Society of America Bulletin 80; American Journal of Science, Volume 267).

Garnets average one millimetre in diameter and commonly comprise up to 15 per cent of the rock (Geological Society of America Bulletin 80). Aluminosilicate polymorphs commonly are two centimetres long and comprise six to seven per cent of the rock (Geological Society of America Bulletin 80); however, in places, andalusite crystals up to five centimetres long are so crowded in certain layers as to form most of the rock (Geological Survey of Canada Memoir 262). Locally, the aluminosilicates are completely altered to muscovite.