Devastator Peak is a dissected andesitic volcanic plug, which was part of a larger structure of Mount Meager, but parts eroded away, leaving Devastator Peak.

Devastator Peak was the source for a thick sequence of andesite lava flows that occurred 0.5-1.0 million years ago.

Erosional remnants of these flows form the stratified crags of Pylon Peak.

The slopes of the peak are highly unstable, consisting of weak, hydrothermally altered felsic rocks.

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