Slide Mountain Ocean

The Slide Mountain Ocean was an ancient ocean that existed between the Intermontane Islands and North America[1] beginning around 245 million years ago in the Triassic period.

It is named after the Slide Mountain terrane, which is composed of rocks from the ancient oceanic floor.

The floor of the Slide Mountain Ocean was pushed up onto the ancient margin of North America.

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Plate tectonics of the Intermontane Islands arc 195 million years ago