Cumulic Mesisol (CU.M)
Common horizon sequence: Of, Om or Oh, Om, C, 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 cumulic layer beneath the surface tier. They may also have fibric or humic layers but lack terric, hydric, and limnic layers. A cumulic layer consists either of multiple layers of mineral material (alluvium) that together are more than 5 cm thick, or of one layer 5-30 cm thick.
Note: Diagnostic horizons are underlined.