Monorthic -Kaolinite, halloysite and or fully hydroxy interlayered vermiculite (HIV) dominate the clay fraction. If smectite is present it should be at low concentrations such that it is not identifiable by appropriate mineralogical analyses (usually less than 10%). Usually the clay fraction CEC at pH 7 is < 30 meq/100g. Coarse fractions are typically siliceous (>90% quartz+resistant minerals).

Sesquimonorthic - Monosiallitic soil material (<2mm fine earth fraction) with moderate to high content of Fe and Al oxyhydroxides, usually > 7% and/or accumulations of more than 5% iron-rich and/or iron cemented bodies such as plinthite. Sesquimonorthic soil materials have less than 10% weatherable minerals in the coarse fraction (>20um).