Cambic Horizon __top__ Jun 2026

The layer must exhibit higher chroma, redder hue, or lower value than the underlying unaltered C horizon. This shift represents the oxidation of iron minerals (brownification).

The Cambic horizon may lack the dramatic flair of a dark, organic topsoil or the stark geometry of a bleached E horizon. Yet, its importance cannot be overstated. It is the soil horizon of transition, of potential, and of early transformation. By identifying and understanding the Cambic horizon, soil scientists can trace the first chapters of a soil's life story, predict its future development, and manage its present resources wisely. cambic horizon

[Parent Material / C Horizon] │ ▼ (Loss of carbonates / Mineral dissolution) [Structure Development] (Subangular blocky rearrangement via wetting/drying) │ ▼ (Oxidation of iron / Weathering of primary minerals) [Cambic Horizon / Bw] (Distinct color and structural change) The layer must exhibit higher chroma, redder hue,

It cannot meet the requirements of an argillic (clay-accumulated) or spodic (organic/aluminum-accumulated) horizon. Pedogenic Pathways of Formation Yet, its importance cannot be overstated

Think of it as the first draft of a soil profile—identifiable changes are present, but the story is far from complete.

To be classified as a cambic horizon under major systems like the USDA Soil Taxonomy and the World Reference Base for Soil Resources (WRB) , the layer must satisfy precise morphological and chemical parameters:

The Cambic horizon forms through relatively mild, early-stage pedogenic processes. These include: