10 Soil Groups:
Differentiated by general soil profile characteristics (kind and
arrangement of horizons).Because of cool and moist climate, the wetness and occurence of histic materials (peat and muck), lack of moisture deficiency problem, and tendency toward spodic horizon formation are among the main soil genetic features considered in the United Kingdom.
Soil Classification:
10 Soil Groups:
Differentiated by general soil profile characteristics (kind and
arrangement of horizons).
The Soil Groups are subdivided
into 43 taxa called Groups: Differentiated according to
presence or absence of diagnostic horizons and their composition.
Groups are subdivided into 109
Subgroups: Differentiated according to presence or absence of
diagnostic horizons and composition of soil materials.
Subgroups are divided into
Series: Differentiated according to differences in texture,
profile contrast, origin, and mineralogy.
Reference
Avery B.W., 1973. Soil Classification in the Soil Survey of England and Wales. J. of Soil Sci, 24: 324-338.
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Introductionx
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3) Soil Formation