# Insular plate

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Ancient oceanic plate

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

The **Insular plate** was an ancient [oceanic plate](/source/Oceanic_plate) that began [subducting](/source/Subduct) under the west-coast of [North America](/source/North_America) around the early [Cretaceous](/source/Cretaceous) period. The Insular plate had a chain of active [volcanic islands](/source/Volcanic_island) that were called the [Insular Islands](/source/Insular_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]

## See also

- [Insular Mountains](/source/Insular_Mountains)

## References

1. **[^](#cite_ref-Burke_Museum_2002_1-0)** Townsend, Catherine L.; Figge, John T. (2002). ["The Coast Range Episode"](https://www.burkemuseum.org/geo_history_wa/Coast%20Range%20Episode.htm). *Northwest Origins: An Introduction to the Geologic History of Washington State*. The Burke Museum of Natural History and Culture, University of Washington. Retrieved 12 August 2019.

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