In the Pleistocene Tuya Volcanic Field, small subaerial shield volcanoes and postglacial cinder cones and lava flows can be recognized. At least one of these volcanoes is of Holocene age. Gabrielse Cone near the headwaters of Iverson Creek in the Stikine Ranges rises with an elevation of and a diameter of . It is mostly made of loose basaltic scoria with a volcanic crater deep at its summit. The northeastern flank of Gabrielse Cone is ruptured where remnants of a basaltic lava flow exists. This basalt lava flow extends more than from the volcano and there is no proof Gabrielse Cone was formed during or before the Cordilleran Ice Sheet. As a result, Gabrielse Cone is unmistakably younger than 11,000 years and it was formed in the Holocene epoch.