Challis Arc

From Wikipedia, the free encyclopedia

The Challis Arc was an Eocene volcanic arc that stretched from Washington to Idaho, United States. The arc formed 57 million years ago as a result of subduction of the eastern block of the Kula Plate ending 37 million years ago. Remnants of the Challis Arc are found as granitic plutons in the North Cascades, the Okanogan Highlands and in southcentral Idaho.[1]

[edit] References

  1. ^ The Challis Episode: Turmoil in the Columbia Embayment


 This volcanology article is a stub. You can help Wikipedia by expanding it.