The Pine River quartzite conglomerate and Keys Lake quartzite, low-grade metamorphic rocks, and informal members of the Michigamme Slate are highly quartzitic units deposited, presumably, in a eugeosyncline tectonic environment. Sedimentary structure orientations and mineral composition of the rocks of the two units suggest a southeastward sediment movement and derivation from similar sedimentary rock sources to the northwest. Composition and texture suggest deposition in shallow-water marine environment close to source areas. Associated 'graywackes' are highly quartzose.

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