The BGS Lexicon of Named Rock Units — Result Details

Pelaw Clay Member

Computer Code: PELC Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Reddish-brown to dark brown silty clay containing well dispersed pebbles ad cobbles (locally abundant), and commonly, small, buff to grey, grotesquely shaped calcareous concretions towards the base of the weathering zone. Clasts mainly of Carboniferous lithologies (sandstone, mudstone, limestone, coal). Typically has closely spaced, subvertical, prismatic jointing that formed during dry periglacial conditions.
Definition of Lower Boundary: Generally a planar, subhorizontal to undulating, gradational, glaciotectonic boundary with underlying dark grey, laminated silt and clay of the Tyne-Wear Glaciolacustrine Formation, or on brown or purplish brown, stony silty sandy clay diamicton of the Wear Till Formation. Locally rests on bedrock.
Definition of Upper Boundary: Generally the ground surface.
Thickness: Generally 1-2m, but reaching 4.5m
Geographical Limits: Lowlands of County Durham and southern Northumberland.
Parent Unit: Tyne And Wear Glaciolacustrine Formation (TYWE)
Previous Name(s): Pelaw Clay (-444)
Upper Clays (*198)
Alternative Name(s): Pelaw Member
Stratotypes:
Type Section  Former sections exposed in Pelaw Brickworks, Newcastle-upon-Tyne [now Monkton Mill Farm]. Francis, 1970. 
Reference(s):
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. 
Smith, D B, 1994. Geology of the country around Sunderland. Memoir of the British Geological Survey, Sheet 21, (England and Wales). 
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. 1998. Geology of the country around Newcastle-upon-Tyne, Memoir of the British Geological Survey, Sheet 20 (England and Wales). 
Bridgland, D R, Horton, B P and Innes, J B. 1999. The Quaternary of northeast England. Field Guide. Quaternary Research Assocation, London. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E021