Domain TD: till dominant

Till dominant domain ice limits

This very extensive domain includes most of the lowlands of Britain lying to the north of the Devensian glacial limit. It is dominated by undulating, subglacially sculptured spreads of Devensian till that is plastered across hills and valley sides and, importantly, is also generally present beneath younger deposits occurring within valleys and on coastal plains.

The domain has a very extensive cover of superficial deposits (~79%). Organic deposits form about 6% of the area (~8% of the area of superficial deposits).

Blanket peat is widespread in Caithness and part of Sutherland covering around 400 000 hectares; this region is known as the 'Flow Country'.

Raised bogs are common around the Solway Firth. Generally peat development is common in the western parts and far north of this domain where rainfall is greatest. Upland peat bogs owe their origin in part to human interference with native wood: the bogs developing post forest clearance from a combination of processes including soil erosion, increased run-off, waterlogging and acidification of the soil, which prevented the trees from re-establishing. Peat growth (and thus thickness of the deposit) may well differ from one part of a bog to another partly due to local variations in climatic wetness and/or hydrological variations in the mire complex.

Localized development of peat may occur within poorly drained hollows associated with hummocky glacial deposits. Within the Cheshire area peat may develop within mires associated with halite solution-induced subsidence. Peat may also occur within the alluvial floodplains and in coastal areas associated with submerged forests.

Mire classification (and guide to dominance within the domain)

Subjective guide to dominance within this domain Topogenous mires Soligenous mires Ombrogenous mires
Dominant     Blanket mire
Locally present Floodplain mire Valley mire

Spring mire

Raised mire
Rare Open water transition mire

Basin mire




For further information please contact Marieta Garcia-Bajo