On Tsimpsean Peninsula, Lower Mesozoic (?) and/or Paleozoic (?) metasedimentary rocks of amphibolite facies occur. Outcroppings of micaceous pelitic schists along the shores of Tuck Inlet and near Port Simpson, may contain up to 43 per cent garnet porphyroblasts and minor kyanite. Along the shores of Tuck Inlet, the garnet porphyro- blasts range up to 5 centimetres in diameter (Geological Survey of Canada, Memoir 394).