Insular plate
Ancient oceanic plate
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The Insular plate was an ancient oceanic plate that began subducting under the west-coast of North America around the early Cretaceous period. The Insular plate had a chain of active volcanic islands that were called the 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]
