The main rock types composing the volcano are phonolite and trachyte, which were deposited during six periods of eruptive activity beginning about 85,000 years ago.

[9] Several large river valleys with wide braided channels penetrate the Boundary Ranges Ecoregion; black cottonwood occur on their floodplains.

[10] A limited number of mammal species thrive in this ecoregion, such as hoary marmots and mountain goats, which inhabit the alpine tundra zone.

This large glacial field is informally named after the son of Olav Mokievsky-Zubok, a glaciologist who carried out significant glaciological work in the Coast Mountains from the 1960s to the 1970s.

[25] Its circular shape and higher elevation have made it relatively stable to climate change, having undergone minor retreat and thinning only at its very edges.

[5][27][28] Hoodoo Mountain is part of the Northern Cordilleran Volcanic Province (NCVP), a broad area of shield volcanoes, lava domes, cinder cones and stratovolcanoes extending from northwestern British Columbia northwards through Yukon into easternmost Alaska.

[29] The dominant rocks comprising these volcanoes are alkali basalts and hawaiites, but nephelinite, basanite and peralkaline[a] phonolite, trachyte and comendite are locally abundant.

This subprovince, confined to the Stikine region of northwestern British Columbia, includes three other volcanic centres: Heart Peaks, Level Mountain and Mount Edziza.

[1][5] Its involvement with glaciation has resulted in several interactions with glacial ice as much as 2 km (1.2 mi) thick, affording multiple examples of glaciovolcanic processes.

[5] Hoodoo Mountain's constant struggle with surrounding and overlying ice is attested by its nearly flat summit, which attains an elevation of 1,850 m (6,070 ft).

[41] Two sets of prominent cliffs partially circumscribe Hoodoo Mountain, which give the volcano a discontinuous, step-like topographic profile.

The lower set of cliffs delimit the base of the volcano except for its southeastern margin where they have been partially overrun by younger lava flows.

Pointer Ridge on the north–central side of Hoodoo Mountain consists of pyroclastic rocks that form a 200 m (660 ft) thick stratigraphic unit.

The Wall, a more than 200 m (660 ft) high cliff at the western base of Hoodoo Mountain, forms the front of an ice-marginal lava flow that displays columnar jointing.

The sequence comprises non-welded lapilli tuff within a matrix of yellow to light green ash, as well as three highly welded lenses up to about 5 m (16 ft) thick.

A 10 m (33 ft) thick subaerial lava flow travelled down the north–central and northeast flanks of Hoodoo Mountain during the latter stages of this eruptive period.

The lava flows do not appear to have interacted with glacial ice, suggesting at least the upper flanks of Hoodoo Mountain were ice-free at the time of their eruption.

This includes subglacially erupted lava lobes and domes, as well as ice-chilled breccia and hyaloclastite, which form a 400 m (1,300 ft) thick volcanic unit.

Lava flows on the southeastern flank drape down 50 m (160 ft) high cliffs and extend into the Twin Glacier valley where they spread out into a broad terminal lobe.

[49] Radiocarbon dating of terrestrial plant macrofossils directly overlying the youngest tephra layer suggest an early Holocene age for this volcanic material.

[50] The glass composition of the tephras is similar to the average whole-rock chemistry of the phonolitic lava flows produced during the final eruptive period at Hoodoo Mountain.

[48] A 12 mm (0.47 in) thick trachytic tephra layer of unknown origin occurs in sediments at Bob Quinn Lake 60 km (37 mi) northeast of Hoodoo Mountain.

Lava flows generated by effusive eruptions could dam the Iskut River and pose a major hazard to mining operations upstream due to rising waters.

[39] Air traffic between Canada, Alaska and Asia would likely be disrupted by high eruption columns due to the presence of major airways near the volcano.

The Canadian National Seismograph Network has been established to monitor earthquakes throughout Canada, but it is too far away to provide an accurate indication of activity under the mountain.

[41] In 1991, Canadian volcanologist Jack Souther provided a short account of the geomorphology of Hoodoo Mountain as well as some age-constraints from preliminary K–Ar dating.

[5] An expedition consisting of university, GSC and industry scientists was organized in 1997 to assess the nature and magnitude of hazards posed by Hoodoo Mountain.

[58] The use of radars to penetrate the ice cap and to assess the subglacial topography proved to be instrumental for studying other glaciated volcanoes in the American Cordillera and elsewhere.

[66] In 1982, Cominco staked two mining claims over their Red Bluff property and adjacent ground near the junction of the Craig and Iskut rivers.

The closest point accessible by road is Bob Quinn Lake about 60 km (37 mi) northeast of Hoodoo Mountain along the Stewart–Cassiar Highway.