At the north end of Tsimpsean Peninsula, a 6 to 7 kilometre zone of highly aluminous, carbonaceous schists occurs. These Paleozoic (?) schists are part of the Central Gneiss Complex and are comprised dominantly of grey biotite, plus or minus hornblende gneiss, amphibolite, and minor sillimanite, plus or minus garnet gneiss. The schists contain abundant kyanite porphyroblasts which range up to 3 centimetres in length (Snyder, 1980). Numerous other garnet and sillimanite localities are present in the Prince Rupert-Skeena area (Open File 1988-26, Figure 9).