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Science 10HEarth Science:
Geological History of BC
Objectives:
By the end of the lesson you should be able to:•Describe how the west coast and province of BC has formed
Geological history of British Columbia
A passive ocean-continent margin existed from around 700 m.y to around 200 m.y.
Geological history of British Columbia• Subduction of
Farallon plate beneath North America.
• Approach of Intermontane Terrane
Geological history of British Columbia• Joining of the
Intermontane/Super-Terrane;
• Consequent thrusting/folding of existing NA plate into the Rocky Mountains;
• Approach of Insular Terrane;
• Subduction and related volcanism
Rocky Mountains
Rocky Mountains
Burgess Shale
Rocky Mountains
Takkakaw Falls
Geological history of British Columbia• Formation of the
Coast Range
• Joining of the Insular Terrane.
• Ongoing subduction of the Juan de Fuca Plate
• Further uplift of the Rocky Mountains.
Present-day plate
distribution along west
coast of Canada
Volcanoes of BC
http://svs.gsfc.nasa.gov/vis/a000000/a001300/a001322/a001322.mp4