Vertical sections of paleosols along the Upper North Saskatchewan River valley show horizons that have distinct brown to reddish-brown colors. Based on such criteria as time for water droplet penetration, magnetic susceptibility, and crystallization of Fe oxides, together with present conditions and vegetation of the fans and floodplain in that area, it was concluded that these brown horizons were fire-affected. The organic debris in the bogs before a fire is continually being enriched with silt blowing from the floodplain. The colored horizons are considered to be a combination of accessed eolian matter reddened in the layer of burning debris and some mineral matter reddened by conducted heat.

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