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Ministry of Energy Mines and Responsible for Core Review

Geological History of Strathcona Park


| Introduction | Geological History of Strathcona Park | Rocks in the park | Plate Tectonics | The first Volcanoes | Fossils |
| The Volcanic Flood | Invasion of the Granite Magma | Wearing Down the Mountains | The Big Chill | Renewed Erosion
| Myra Falls Mine | Contributors | Maps & Figures |

 

 

Today, it is a short trip from Vancouver to Vancouver Island and the scenery of Strathcona Park, but it was not always so. Vancouver Island began to form 380 million years ago on the ocean floor in what is now the deep eastern Pacific. Over some 200 million years, three distinct episodes of volcanic eruption built on each other to raise a landmass above the surface of the sea. In the long interludes between the eruptions, limestones and sediments accumulated on the tops of the dormant volcanoes. This ancient land is called Wrangellia by geologists, for the Wrangell mountains in Alaska. Sometime between 140 and 65 million years ago, Wrangellia was gradually carried eastward on its crustal plate to collide with other terranes and, eventually, with North America. Today the Wrangellia terrane stretches from Vancouver Island, through the Queen Charlotte Islands into the Yukon and southeastern Alaska.



View of Mount McBride from Buttle Lake

Click to view This diagram (when viewed full size) shows the sequence of rocks (stratigraphy) that occurs within the park and immediately adjacent to it, including the names and ages of the natural rock layers or strata.