Podosol soils have B horizons that are dominated by extra material, e.g. organic matter, aluminium or iron. Soils with these properties are common across the world however Australia is know to have great diversity in this soil order.
The sub-order classification of Podosols is based on the drainage of the soil, found here.
Great group classification is based on the different sub-orders.
Great group classification for Aceric Podosols is here.
Great group classification for Semiaquic Podosols is here.
Great group classification for Aquic Podosol is here.
Sub-groups classification is consistent for all great groups and can be found here.
SoilSarah 