The BGS Lexicon of Named Rock Units — Result Details

Cumbrian Esk Alluvium Member

Computer Code: CEAL Preferred Map Code: notEntered
Status Code: Full
Age range: Holocene Epoch (QH) — Holocene Epoch (QH)
Lithological Description: Silts, clays, sands and gravels, underlying the floodplains of the Cumbrian Esk catchment. At the Type Section the top part of the alluvial sequence coarsens downwards from brown clay into sand.
Definition of Lower Boundary: Sharply erosional, unconformable on all older Quaternary deposits (particularly till at the Type Section) and on bedrock.
Definition of Upper Boundary: The ground surface, or overlain by peat of the Blelhem Peat Formation, or overlain by blown sand of the Drigg Point Sand Formation.
Thickness: 11.58m at the Type Section, but probably typically 5 to 10m thick in the type area.
Geographical Limits: 1:50k Sheet 37 Gosforth, south of Muncaster Fell.
Parent Unit: Cumbrian Esk Valley Formation (CEVY)
Previous Name(s): Alluvium (ALV)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Alluvium within the valley of the Cumbrian River Esk from due south of Muncaster Castle to due north of Linbeck Farm, west Cumbria. 
Type Section  Muncaster Bridge Borehole 1 (BGS Registered Borehole SD19NW/1), from 0.0 to 11.58m depth, southern side of River Esk, c 1km east of Muncaster Castle, west Cumbria. 
Reference(s):
Trotter, F M, Hollingworth, S E, Eastwood T and Rose, W C C. 1937. Gosforth District. Geological Survey Memoir, England and Wales, Sheet 37. 
Akhurst, M C, Chadwick, R A, Holliday, D W, McCormac, M, McMillan, A A, Millward, D, Young, B, Ambrose, K, Auton, C A, Barclay, W J, Barnes, R P, Beddoe-Stephens, B, James, J C W, Johnson, H, Jones, N S, Glover, B W, Hawkins, M P, Kimbell, G S, MacPherson, K A T, Merritt, J W, Milodowski, A E, Riley, N J, Robins, N S, Stone, P and Wingfield, R T R. 1997. The geology of the west Cumbria district. Memoir of the British Geological Survey, Sheets 28, 37 and 47 (England and Wales). 138pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable