The Insular Islands were a giant chain of active volcanic islands somewhere in the Pacific Ocean during the Cretaceous time that rode on top a microplate called the Insular Plate, beginning around 130 million years ago. An island (ˈaɪlənd or isle (/ˈaɪl/ is any piece of land that is completely surrounded by water in two dimensions above high tide and isolated from other significant The Pacific Ocean is the largest of the Earth 's Oceanic divisions The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of The Insular Plate was an ancient Oceanic plate that began Subducting under the west-coast of North America around the early Cretaceous time These islands collided then fused onto the North America during the Mid-Cretaceous time. The Insular Islands were already very ancient before they collided against North America. Like the earlier Intermontane Islands, the islands were simply too massive to subduct beneath North America. The Intermontane Islands were a giant chain of active Volcanic islands somewhere out in the Pacific Ocean during the Triassic time beginning around 245 million The Insular Islands jammed and shut down the subduction zone. In Geology, a subduction zone is an area on Earth where two tectonic plates meet and move towards one another with one sliding underneath the other In its place, the pre-existing Farallon Trench took over as the major subduction zone. The Farallon Trench was an ancient Oceanic trench on the west coast of North America during the late Cretaceous period
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