The Insular Islands were an extended chain of volcanic islands forming an arc in what is now the Pacific Ocean during the Paleozoic and Mesozoic eras. The islands formed by subduction and melting of the Farallon Plate along a fragment (or microplate) upon which they rose called the Insular Plate.
The Insular Islands were a series of volcanic islands in an arc configuration in the Pacific Ocean during the Paleozoic and Mesozoic eras. The islands resulted from the subduction and melting of the Farallon Plate on a smaller plate, known as the Insular Plate.