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hich are in the form of pillow lavas, tuff breccias and hyaloclastite. All of these volcanoes were active in the last 150,000 years, with the latest eruption having occurred from The Volcano about 150 years ago. The remaining Iskut volcanoes are Cinder Mountain, Little Bear Mountain and the Cone Glacier, Iskut Canyon, Second Canyon, Snippaker Creek, King Creek and Tom MacKay Creek cones.

Like other volcanoes in the NCVP, Hoodoo Mountain has its origins in rifting of the North American Plate caused by crustal extension. This has resulted from the Pacific Plate sliding northward along the Queen Charlotte Fault, on its way to the Aleutian subduction zone in Alaska. As the continental crust stretches, the near surface rocks fracture along steeply dipping faults parallel to the rift. Several dormant volcanoes in the NCVP are potentially active, with Hoodoo Mountain being one of many having erupted in the last 10,000 years. Tseax Cone, which last erupted about 240 years ago, is the southernmost NCVP volcano while Prindle Volcano in easternmost-central Alaska, which last erupted in the Pleistocene, is generally considered the northernmost.

Structure
An aerial view of a vertical grey-coloured rock column rising above sparsely vegetated slopes.
The Monument is one of several hoodoos that have given Hoodoo Mountain its name.
Hoodoo Mountain is one of the largest peralkaline volcanoes in the NCVP. It is a stratovolcano composed primarily of peralkaline phonolite and trachyte lava flows and hyaloclastites, although some pyroclastic rocks are also present. Its peralkalinity is unique among other volcanoes in the Iskut volcanic field, which range in composition from alkali basalt to hawaiite. Hoodoo has also been designated as a subglacial volcano due to much of the mountain having formed subglacially in the last 85,000 years. Its involvement with glaciation has resulted in several interactions with glacial ice as much as 2 kilometres (1.2 miles) thick, affording multiple examples of glaciovolcanic processes. This includes the formation of ice-margin

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