This domain encompasses all the alluvial tracts that characterise the drainage systems of Britain; it therefore 'cuts across' most other domains. It is an important domain economically, because low-lying ground of this type has been favoured for siting major communications routes, industries and settlements.
The domain has almost complete cover of superficial deposits (~81%). Organic deposits form a negligible mapped extent of the area (~0.2% of the area of superficial deposits).
The landforms are essentially the floodplain and associated river terraces. The typical floodplain consists of the alluvium of the active channel. In the larger and wider lowland floodplains, alluvial deposits commonly comprise a silt or clay/silt upper layer a few metres thick, underlain by sand and gravel of similar or greater thickness, some of which may represent the incised parts of earlier river terrace deposits. Both lithological associations can include lenses of lacustrine clay and peat-rich organic deposits; significant thicknesses peat may also be present at the surface in abandoned channels.
|Subjective guide to dominance within this domain||Topogenous mires||Soligenous mires||Ombrogenous mires|
|Locally present||Valley mire
|Rare||Open water transition mire||Raised mire|
For further information please contact Marieta Garcia-Bajo