The BGS Lexicon of Named Rock Units — Result Details

Tyne And Wear Glaciolacustrine Formation

Computer Code: TYWE Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Laminated greyish brown to brownish grey, silty clay and micaceous clayey silt with subordinate beds and laminae of fine-grained sand, pebbly clay diamicton and gravel. Complex interdigitation of units is common, especially towards the coast. Dropstones are common and worm traces can be seen locally on partings. The complex sequence was deposited in several lake basins including Glacial Lake Wear and Glacial Lake Edderacres where it tends to fine upwards and southwards with fine-grained units successively overlapping coarser ones northwards.
Definition of Lower Boundary: Generally in irregular, draped, conformable contact with underlying dark grey, stony sandy silty clay diamicton of the Wear Till Formation.
Definition of Upper Boundary: Generally a planar, subhorizontal to undulating, gradational, glaciotectonic boundary with overlying reddish-brown to dark brown pebbly silty clay of the Pelaw Clay Member.
Thickness: Up to 60m within buried channels.
Geographical Limits: Lowlands of County Durham.
Parent Unit: North Pennine Glacigenic Subgroup (NPEG)
Previous Name(s): Middle Sands, Gravels And Clays (-1882)
Tyne-Wear Complex (-1883)
Durham Complex (-3101)
Alternative Name(s): Durham Member
Stratotypes:
Type Section  Former sections in opencast workings at the Herrington Colliery, Sunderland. Hughes and Teasdale, 1999. 
Reference(s):
Smith, D B. 1998. Geology of the country around Newcastle-upon-Tyne, Memoir of the British Geological Survey, Sheet 20 (England and Wales). 
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). 
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. 
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. 
Hughes, D B and Teasdale, D A. 1999. Herrington Colliery opencast coal site. 137-145 in Bridgland, D R, Horton, B P and Innes, J B. The Quaternary of northeast England: Field Guide. [London: Quaternary Reseach Association.] 
Smith, D B, 1994. Geology of the country around Sunderland. Memoir of the British Geological Survey, Sheet 21, (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E027