"On the Skookum Chuck mineral claim (on Quadra Island), opposite Seymour Narrows, two shafts, 9 and 20 feet (2 and 7 metres) deep respectively, have been sunk in amygdaloidal greenstones. A few specks of chalcocite and chalcopyrite were noticed in samples lying about the mouths of the shafts which contained water" (Geological Survey of Canada Memoir 23, page 128). The Geological Survey of Canada Open File Map 480 shows the area to be underlain by Upper Triassic Karmutsen Formation volcanics rocks.