These lava lakes overlie rock fragments inside the central volcanic conduit which accompanied with collapse of a narrower and higher summit.

[3][11][12] It lies at the northern end of the Mount Edziza volcanic complex which also includes the smaller Arctic Lake and Kitsu plateaus to the south.

[12][14][15] Small portions of the Edziza Formation occur north, northwest and southwest of Nuttlude Lake which is an expansion of Kakiddi Creek.

However, the Kakiddi trachyte flows travelled along gently sloping valleys for at least 10 kilometres (6.2 miles), suggesting that they were extruded more fluidly than those of the Edziza Formation.

[1] It comprises explosion breccias, landslide or lahar deposits and thick, steeply-dipping flows that were erupted as highly viscous lava.

[23] Lava of the upper assemblage is highly irregular or lenticular in cross section, but it contains individual cooling units as much as 150 m (490 ft) thick.

[1] Extremely coarse breccias occur in the western proximity and contain massive, up to 7.5[convert: needs unit name] wide volcanic blocks that were probably deposited directly from the central conduit during eruption.

[24] Exposed in the steep Tenchen cirque headwall are large volcanic blocks and small breccia fragments within the central conduit that accompanied with collapse of a narrower summit with a much smaller crater.

[24] A circular ridge surrounding this ice-filled crater is partially exposed above the ice cap as a discontinuous series of spires and serrated nunataks.

[1] The remnants of several lava lakes are exposed inside the crater where the eastern side of the summit ridge has been breached by active cirques.

Well-developed, vertical and rectangularly jointed trachyte forms this unit and comprises a shear cliff across the full width of the Tenchen cirque headwall.

[27] Exposed in the underlying basement rocks on the deeply eroded eastern flank of Mount Edziza are subvolcanic trachyte cupolas, sills, dikes and irregular intrusive masses linked to the magma plumbing system.

[28] The Tenchen cirque headwall exposes dikes, sills and breccias within the central conduit that have been intensely altered by hydrothermal solutions, resulting in the rocks being bright yellow and ochre-weathered.

[31] Triangle Dome displays a pattern of columnar cooling joints that indicates it was formed by volcanic activity in a subglacial environment.

[24] This pile of agglutinated trachyte spatter, pumice and bombs was the source of at least two separate lobes of lava that flowed onto the adjacent plateau surface.