The BGS Lexicon of Named Rock Units — Result Details

Etwall Sand And Gravel Member

Computer Code: ETSG Preferred Map Code: symb
Status Code: Full
Age range: Pleistocene Epoch (QP) — Pleistocene Epoch (QP)
Lithological Description: Predominantly cold-phase sands and gravels that underlie the Etwall Terrace. Intensely cryoturbated, decalcified poorly sorted sand and gravel, dominated by rounded pebbles of "Bunter" quartz/quartzite (typically c.80%) with subordinate subangular flint (up to c.20%), Carboniferous chert, sandstone, etc. Fragmentary terrace surface appears to be c.20m above the Trent floodplain in the type area. The upper part locally includes a rubified palaeosol (Hykeham Soil; Ipswichian). The Member is correlated with the Ockbrook Sand and Gravel Member (Trent Valley Formation) and Knighton Sand and Gravel Member (Soar Valley Formation).
Definition of Lower Boundary: Unconformable, commonly channelled base, resting on pre-Quaternary bedrock.
Definition of Upper Boundary: Ground surface.
Thickness: 0 to c.3m
Geographical Limits: Occurs as outliers on the north bank of the Trent in the Type Area (Sheet 141); thought to be present upstream, particularly on the north bank of the Dove downstream of Uttoxeter (Sheet 140) and probably elsewhere. (e.g. on the south bank of the Trent near Alrewas, Sheet 154) but the extent is uncertain pending resurvey.
Parent Unit: Trent Valley Formation (TRVA)
Previous Name(s): Upper Hilton Terrace (-896)
Etwall Sand And Gravel (-238)
Hilton Gravel (-2176)
Etwall Member (-4642)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Hilton-Eywall-Willington. Brandon, 1997; Brandon and Cooper, 1997. 
Reference(s):
Carney, J N, Ambrose, K and Brandon, A. 2001. Geology of the country between Burton, Loughborough and Derby. Description of 1:50k Sheet 141 (England and Wales). 
Clayton, K M. 1953. The glacial chronology of part of the middle Trent basin. Proceedings of the Geologists' Association, Vol.64. 198-207. 
Brandon, A. 1997. Geology of the Stretton and Repton areas: 1:10 000 Sheets SK22NE and SK32NW. British Geological Survey Technical Report WA/97/02. 
Carney, J N, Ambrose, K and Brandon, A. 2002. Geology of the Loughborough district. Sheet explanation of the British Geological Survey, Sheet 141 (England and Wales). 
Posnansky, M. 1960. The Pleistocene succession in the middle Trent basin. Proceedings of the Geologists' Association, Vol.17, 285-311. 
Rice, R J. 1968. The Quaternary Era, 332-355 in: Sylvester-Bradley, P C and Ford, T D (editors). The Geology of the East Midlands. (Leicester University Press). 
Stevenson, I P and Gaunt, G D, 1971. Geology of the country around Chapel-en-le-Frith. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 99. 
Brandon, A and Cooper, A H, 1997. Geology of the Etwall area: 1:10 000 Sheet SK23SE. British Geological Survey Technical Report WA/97/03. 
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E141 E140 E154