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The Steep Rock Group, Little Falls assemblage, Finlayson greenstone belt, and Lumby Lake greenstone belt form a once-continuous Mesoarchean terrane at the southern margin of Wabigoon subprovince, Canadian Shield. Synchronous with eruptive activity, oceanic plateau basalts in this region were intruded by tonalitic batholiths, which fed intermediate to felsic volcanic cones and associated mass-flow sediment aprons. A sedimentary succession capping the volcanic pile records stream-induced channel incision into upraised basalt and tonalite, feeding sediment to a delta complex. Base-level rise caused the incised channels to backfill, stromatolitic carbonates to develop in shallow-marine areas, and finally, deposition of iron formation to...

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