[1] The lower part of Gnu Butte consists of Raspberry Formation basalt flows of the Mount Edziza volcanic complex.

They overlie gently dipping beds of sandstone and conglomerate of Early Tertiary age.

The upper part of the butte consists of basalt, comendite and epiclastic deposits of the Armadillo Formation, another stratigraphic unit of the Mount Edziza volcanic complex.

The epiclastic deposits consist of gravel and landslide debris derived from thick comenditic lava flows that form a ridge adjacent to Gnu Butte.

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