Intermontane Islands

The Intermontane Islands were a giant chain of active volcanic islands somewhere in the Pacific Ocean during the Triassic time beginning around 245 million years ago. They were 600 to 800 miles (1,300 km) long and rode atop a microplate known as the Intermontane Plate. Over early Jurassic time the Intermontane Islands and the Pacific Northwest drew closer together as the continent moved west and the Intermontane Plate subducted. About 180 million years ago in the Mid-Jurassic time the last of the Intermontane Plate subducted and the Intermontane Islands collided with the Pacific Northwest, forming parts of British Columbia, Canada. The Intermontane Islands were too big to sink beneath the continent, and welded onto the continent. Geologists call the ocean that existed between the Intermontane Islands and North America the Slide Mountain Ocean.

Other articles related to "intermontane, islands, intermontane islands, island":

Intermontane Plate
... The Intermontane Plate was an ancient oceanic tectonic plate that lay on the west coast of North America about 195 million years ago ... The Intermontane Plate had a chain of volcanic islands called the Intermontane Islands ... The Intermontane Islands had been accumulating as a volcanic chain in the Pacific Ocean since Triassic time, beginning around 245 million years ago ...
Intermontane Belt - Geology
... The formation of the Intermontane Belt is complex ... It began forming during the early Jurassic period when an island arc collided against a pre-existing continental margin called the Intermontane Islands ... This island arc is believed to have formed on a pre-existing tectonic plate called the Intermontane Plate about 245 million years ago by subduction of the former Insular Plate during the Triassic period ...
Intermontane Plate - Collision of The Intermontane Islands
... Over early Jurassic time, the Intermontane Islands and the Pacific Northwest drew closer together as the continent moved west and the Intermontane ... the middle Jurassic, the last of the microplate subducted, and the Intermontane Islands collided with the Pacific Northwest ... The Intermontane Islands were too big to sink beneath the continent ...

Famous quotes containing the word islands:

    What are the islands to me
    if you are lost
    what is Naxos, Tinos, Andros,
    and Delos, the clasp
    of the white necklace?
    Hilda Doolittle (1886–1961)