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Insular plate

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Ancient oceanic plate

Plate tectonics along the west coast of North America 130 million years ago

TheInsular plate was an ancientoceanic plate that begansubducting under the west-coast ofNorth America around the earlyCretaceous period. The Insular plate had a chain of activevolcanic islands that were called theInsular Islands. These volcanic islands, however, collided then fused onto the west-coast of North America when the Insular plate jammed then shut down ending the subduction zone.^[1]

References

[edit]

^Townsend, Catherine L.; Figge, John T. (2002)."The Coast Range Episode".Northwest Origins: An Introduction to the Geologic History of Washington State. The Burke Museum of Natural History and Culture, University of Washington. Retrieved12 August 2019.

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