The BGS Lexicon of Named Rock Units — Result Details

Holmeside Clay Member

Computer Code: HSCLY Preferred Map Code: HSC
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Interbedded moderate to reddish brown (Munsell Soil) clay and silt with subordinate beds of gravel and silty sand. The fine-grained lithologies are typically laminated and some laminae are graded (rhythmites). Sparse shell fragments.
Definition of Lower Boundary: Sharp, unconformable contact with underlying dark reddish brown pebbly silt diamicton of the Green Croft Till Member of the Aikbank Farm Glacigenic Formation. Taken at the top of the uppermost bed of diamicton in the sequence.
Definition of Upper Boundary: Sharp, undulating, erosional boundary with overlying pale brown fine-grained sand of the Mainsgate Wood Sand and Gravel Member of the Aikbank Farm Glacigenic Formation.
Thickness: To 17.7m
Geographical Limits: Lower Wasdale, West Cumbria, inland of the limit of ice of the Irish Sea Ice Stream during the "Gosforth Oscillation".
Parent Unit: Aikbank Farm Glacigenic Formation (AIK)
Previous Name(s): Lake Floor Deposits (-3480)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  BGS registered borehole SD19NW12 (Aikbank Farm Borehole 2), from 10.06 to 27.73m depth. Nirex, 1997. 
Reference Section  BGS registered borehole SD19NW11 (Aikbank Farm Borehole 1), from 9.91 to 25.34m depth. Nirex, 1997. 
Reference(s):
Merrit, J W and Auton, C A. 2000. An outline of the lithostratigraphy and depositional history of Quaternary deposits in the Sellafield district, west Cumbria. Proceedings of the Yorkshire Geological Society, Vol.53, 129-154 
Merritt, J W and Auton, C A. 1997. Quaternary lithostratigraphy of the Sellafield district. Nirex Science Report SA/97/045 (Issue 2.0). [Report prepared for UK Nirex Ltd. 69pp, 5 tables, 20 figures, 14 enclosures and one appendix.] 
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. 
Trotter, F M, Hollingworth, S E, Eastwood T and Rose, W C C. 1937. Gosforth District. Geological Survey Memoir, England and Wales, Sheet 37. 
Huddart, D. 1991. The glacial history and glacial deposits of the north and west Cumbrian lowlands, 151-167 in Ehlers, J, Gibbard, P L and Rose, J (editors), Glacial deposits in Great Britain and Ireland. [London: Balkema.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable