Dunwich Group

The Dunwich Group is a Pleistocene lithostratigraphic group (a sequence of rock strata or other definable geological units) present in England north of the upper Thames and, downstream, a line drawn east from near Marlow to Clacton-on-Sea and which encompasses river terrace deposits of the Proto-Thames and other rivers. It unconformably overlies Triassic to Pleistocene bedrock and superficial deposits. In turn it is often overlain by deposits of the Albion Glacigenic Group and sometimes by those of the Britannia Catchments Group or British Coastal Deposits Group and interfingers in places with those of the Crag Group. No deposits potentially assignable to the group have been identified north of East Anglia or the English Midlands; they are likely to have been destroyed or removed by glacial action.[1]

Dunwich Group
Stratigraphic range: Pleistocene
TypeGroup
Unit ofGreat Britain Superficial Deposits Supergroup
Sub-unitsYarmouth Roads Formation, Cromer Forest Bed, Kesgrave Catchment Subgroup
UnderliesAlbion Glacigenic Group, Britannia Catchments Group, British Coastal Deposits Group
OverliesCrag Group
Thicknessup to 15 m (49 ft)
Lithology
Primaryfluvial gravels
Othersand, clay, silt
Location
CountryEngland
ExtentEast Anglia and English Midlands

References

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