The Metchosin Igneous Complex of southern Vancouver Island has three components—gabbro stocks (formerly Sooke Gabbro), a newly recognized sheeted-dike complex, and a basaltic volcanic sequence (formerly the Metchosin Volcanics). The sheeted dikes occupy a position transitional between the gabbro stocks and submarine volcanics, which they tie together in an ophiolitic pseudostratigraphy. The submarine volcanics shoal upward and pass into subaerial sheet flows. The complex formed in an area of regional extension, as an emergent island.

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