The BGS Lexicon of Named Rock Units — Result Details

Southrey Sand And Gravel Member

Computer Code: SOYSG Preferred Map Code: notEntered
Status Code: Full
Age range: Pleistocene Epoch (QP) — Pleistocene Epoch (QP)
Lithological Description: Predominantly cold-phase sands and gravels that underlie the Southrey Terrace. At surface, dominated by rounded pebbles of "Bunter" quartz/quartzite (c.60%) with subordinate subangular flint, etc. (c.40%). Terrace surface highly dissected but rises to c.6 to 7m above the Witham floodplain in the Type Area. Associated silts yielding a temperate flora and fauna occur at at least two sites; these might occur at the base of the unit but relationships are uncertain. Correlated with the Balderton Sand and Gravel Member (Trent Valley Formation, west of the Lincoln Gap) and the Egginton Sand and Gravel Member (Trent Valley Formation).
Definition of Lower Boundary: Unconformable, commonly channelled base, resting on Anglian Wragby Till (Lowestoft Formation).
Definition of Upper Boundary: Ground surface.
Thickness: 0 to c.6m
Geographical Limits: Distributed along the east side of the present Witham valley from Southrey [TF 13 66] to Kirkstead [TF 19 60] (where it passes onto the Thorpe Member of the Bain). Distribution elsewhere uncertain but correlatives probably present northwest (upstream) of Southrey along the Barlings Eau or River Langworth, to the Langworth area [TF 06 76 (BGS sheets 102, 114, 115, ?128). Correlatives up the Langworth River are unlikely to be quartzite-rich and more probably are like the Thorpe Sand and Gravel of the Bain, so it is questionable if they should be included as Southrey Sand and Gravel Member per se.
Parent Unit: Trent Valley Formation (TRVA)
Previous Name(s): River Terrace Deposits (RTD)
Older River Sand And Gravel (ORSG)
Southrey Terrace Deposits (-110)
Upper River Terrace (-1837)
River Terrace Sand And Gravel, Undifferentiated (-4336)
Southrey Member (-4337)
Alternative Name(s): none recorded or not applicable
Type Section  Northeast bank of Witham valley, Woodhall Spa-Kirkstead Bridge area. Brandon and Sumbler in Bowen, 1999. 
Brandon A and Sumbler, M G. 1991. The Balderton Sand and Gravel: pre-Ipswichian cold stage fluvial deposits near Lincoln, England. Journal of Quaternary Science, Vol.6. 117-138. 
Straw, A. 1958. The glacial sequence in Lincolnshire. East Midlands Geographer, Vol.2, 29-40. 
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. 
Brandon, A and Sumbler M G. Unpublished manuscript. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E102 E114 E115