The
Karmutsen Formation is a
Late Triassic volcanic sequence of tholeiitic pillow basalts and breccias on
Vancouver Island,
British Columbia,
Canada. It is perhaps the thickest accreted section of an
oceanic plateau worldwide, exposing up to 6000 m of basal sediment-
sill complexes,
basaltic to picritic pillow lavas, pillow
breccia, and thick, massive basalt flows. The widespread succession of basalts and breccias are part of the
Insular Mountains, a large volcanic mountain range that forms Vancouver Island and the
Queen Charlotte Islands. In
Strathcona Provincial Park,
pillow basalts is the most abundant rock unit. About half the mountains, including the highest ones, are carved from these basalts, such as
Golden Hinde, which is the highest peak on Vancouver Island.