Fibric Mesisol (FI.M)
Common horizon sequence: Of, Om or Oh, Om, Of, Om
Soils of this subgroup have the general properties specified for the Organic order and the Mesisol great group. They differ from Typic Mesisols by having a subdominant fibric layer thicker than 25 cm in the middle or bottom tiers. These soils do not have a subdominant humic layer thicker than 25 cm.
Note: Diagnostic horizons are underlined.