Heat generated from the farallon plate subducting below the north american plate led to the creation of an island arc of volcanoes on the west coast of proto-north america between the late devonian and permian periods .

泥盆纪晚期和二叠纪时期之间，隐没在北美板块下面的法拉龙板块产生的热导致了原北美西海岸的火山岛弧的产生。