The BGS Lexicon of Named Rock Units — Result Details

How Man Till Member

Computer Code: HMTI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Stiff, reddish brown, matrix-supported sandy clay diamicton, with well dispersed angular to subrounded clasts up to boulder size. The clasts are mainly of red sandstone, Skiddaw Group slate, Borrowdale Volcanic Group rocks, Coal Measure sandstone, coal, limestone, ironstone, dolomite, grey ?Criffel granite, granophyre, granodiorite, quartzite, vein quartz, andesite and shell fragments.
Definition of Lower Boundary: Generally planar or undulating contact on to older units including the top of the Gutterfoot Sand Member of the Gosforth Glacigenic Formation, the top of the Townhead Boulder Gravel Member, and the top of the Ravenglass Till Member of the Seascale Glacigenic Formation.
Definition of Upper Boundary: Erosional base of the Peel Place Sand and Gravel Member of the Gosforth Glacigenic Formation or overlain by Holocene deposits such as blown sand or peat.
Thickness: To c.1.7m
Geographical Limits: 1:50k Sheets 28 Whitehaven and 37 Gosforth. St Bees to Seascale area, western Cumbria.
Parent Unit: Gosforth Glacigenic Formation (GOGL)
Previous Name(s): Upper Boulder Clay (-4662)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Coastal area between St Bees and Seascale, west Cumbria. Nirex Science Report SA/97/045 (Issue 2.0). 1997. 
Type Section  Back scarp of major landslip 750m southeast of How Man, c.2.3km south of St Bees, west Cumbria. Nirex Science Report SA/97/045 (Issue 2.0). 1997. 
Reference(s):
Eastwood T, and others. 1968. Geology of the country around Whitehaven. Memoir of the Geological Survey of Great Britain, Sheet 28 (England and Wales). 
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.] 
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