The BGS Lexicon of Named Rock Units — Result Details

Wear Till Formation

Computer Code: WETI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Dark greyish brown to dark yellowish brown, extremely compact, stony sandy silty clay diamicton with clasts dominated by Carboniferous lithologies (sandstone, gritty dandstone, limestone, mudstone, ganister, coal), but including Whin Sill dolerite and far-travelled clasts from Scotland and the Lake District (greywacke sandstone and siltstone, granite and granodiorite). Includes some large rafts of local rocktypes towards the base.
Definition of Lower Boundary: Generally a sharp uneven contact on bedrock, but locally a complex gradational glaciotectonic contact with fractured or decomposed bedrock.
Definition of Upper Boundary: Generally irregular, draped, conformable contact with overlying thinly laminated, greyish brown to brownish grey, silty clay and micaceous clayey silt, or gravel of the Tyne and Wear Glaciolacustrine Formation.
Thickness: Generally 3-10m, locally to 30m
Geographical Limits: Lowlands of County Durham and southern Northumberland.
Parent Unit: North Pennine Glacigenic Subgroup (NPEG)
Previous Name(s): Durham Lower Till (Boulder Clay) (-3757)
Alternative Name(s): Winch Gill Member
Stratotypes:
Type Section  River cliff section in the valley of Winch Gill, a minor tributary of the River Wear, southsouthwest of Leamside, Durham City. Francis, 1970. 
Reference(s):
Smith, D B. 1981. The Quaternary geology of the Sunderland district, northeast England. 146-167 in Neale, J and Flenley, J (editors), The Quaternary in Britain. [Exeter: Pergamon Press.] 267pp. 
Francis, E A. 1970. Quaternary. 134-152 in Johnson, G A L, Geology of Durham County. [Newcastle: Natural History Society of Northumberland, Durham and Newcastle-upon-Tyne.] 152pp. 
Smith, D B and Francis, E A. 1967. Geology of the country between Durham and West Hartlepool. Memoir of the Geological Survey of Great Britain, Sheet 27 (England and Wales). 
Smith, D B. 1998. Geology of the country around Newcastle-upon-Tyne, Memoir of the British Geological Survey, Sheet 20 (England and Wales). 
Thomas, G S P. 1999. Northern England. 91-98 in Bowen, D Q (Editor), A revised correlation of Quaternary and Neogene 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:
none recorded or not applicable