It is part of a large piece of crust, called Wrangellia, that also includes southeast Alaska, the Queen Charlotte Islands and part of the Coast Mountains. 380 million years ago. some of the oldest rock that makes up present day Vancouver Islandwas formed by undersea lava deposits. About 100 million years ago, Wrangellia collided with the North American continent. Slow but tremendous forces caused some regions to fold and buckle into mountain ridges and others to crumble and erode some of the oldest rock that makes up present day Vancouver Islandwas formed by undersea lava deposits.
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