The BGS Lexicon of Named Rock Units — Result Details

Selsey Sand Formation

Computer Code: SLSY Preferred Map Code: Slsy
Status Code: Full
Age range: Lutetian Age (GL) — Lutetian Age (GL)
Lithological Description: Silty sand, silty clay and sandy clayey silt, glauconitic, bioturbated, locally calcareous.
Definition of Lower Boundary: Rests on the Marsh Farm Formation at a sharp contact on a burrowed surface overlain by glauconitic sandy silt with a few pebbles.
Definition of Upper Boundary: Overlain by Barton Clay Formation. Boundary based a distinction of sand content from fine- to very fine-grained sandstone of the Tellina Bed (topmost Selsey Formation) to the olive grey glauconitic sandy clays of the Barton Clay Formation.
Thickness: c.25-27m
Geographical Limits: Eastern Hampshire Basin.
Parent Unit: Bracklesham Group (BRB)
Previous Name(s): Selsey Formation (-3683)
Selsey "Division" (-4332)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Seacliffs at Whitecliff Bay, Isle of Wight. 
Partial Type Section  Bracklesham Bay foreshore. 
Reference(s):
Edwards, R A and Freshney, E C. 1987. Lithostratigraphical classification of the Hampshire Basin Palaeogene Deposits (Reading Formation to Headon Formation) Tertiary Research, Vol.8, 43-73. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E315 E331 E314