 Tuya Butte is part of the Tuya Volcanic Field, a volcanic field that includes tuyas, postglacial lapilli cones and lava flows and several small shield volcanoes formed during the Pleistocene and Holocene.This in turn is part of the Northern Cordilleran Volcanic Province from Prince Rupert, into the Yukon and the Alaska border caused by rifting of the North American Plate as the Pacific Plate slides northward along the Queen Charlotte Fault.Tuya Butte formed when magma intruded into and melted a vertical pipe in the overlying Cordilleran Ice Sheet.