The BGS Lexicon of Named Rock Units — Result Details

Hamble Formation

Computer Code: HBLE Preferred Map Code: notEntered
Status Code: Full
Age range: Early Pleistocene Epoch (QPE) — Holocene Epoch (QH)
Lithological Description: Floodplain alluvium and river terrace deposits. The floodplain alluvium comprises overbank deposits of brown organic silty clay, together with peaty clay, and peat, overlying sand and gravel. The surviving river terrace deposits comprise sand and gravel, commonly cross-bedded, locally overlain by overbank deposits of clayey and sandy silts and silty clays. These fine-grained deposits may be partly aeolian in origin. The major gravel lithology is flint, dominantly sub-rounded to sub-angular, with a little well-rounded. The sand fraction is composed of well-rounded quartz grains and sub-angular flint. The older, higher terraces are commonly cryoturbated.
Definition of Lower Boundary: Unconformable on Palaeogene bedrock.
Definition of Upper Boundary: Surface.
Thickness: To c.12m
Geographical Limits: The catchment of the Hamble River and its tributaries, in the Southampton area.
Parent Unit: Solent Catchments Subgroup (SNTCA)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The valley of the Hamble River and its tributaries in the Southampton area. Edwards and Freshney, 1987. 
Reference(s):
Edwards, R A and Freshney, E C. 1987. Geology of the country around Southampton. Memoir of the British Geological Survey, Sheet 315 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E315