The BGS Lexicon of Named Rock Units — Result Details

Ravenglass Till Member

Computer Code: RVTI Preferred Map Code: RVT
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Moderate brown sandy silty gravelly diamicton, very compact, matrix-supported, generally massive, containing moderately well dispersed, subangular to subrounded clasts of granophyre, granite, Borrowdale Volcanic Group rocks (rhyolite, welded tuff, slate), with some red sandstone, ironstone and shell fragments.
Definition of Lower Boundary: Not seen in sections, but probably mainly a sharp, irregular, unconformable contact with bedrock. Locally a sharp, unconformable contact with a sequence of reddish or yellowish brown sand, silt and clay of the Barn Scar Sand and Silt Member of the Seascale Glacigenic Formation.
Definition of Upper Boundary: Sharp, undulating, unconformable contact with overlying sand and gravel deposits or till units of the Gosforth Glacigenic Formation.
Thickness: To 10m
Geographical Limits: The coast to the west of the Lake District inland of the limit of the "Gosforth Oscillation" between Cleator and Ravenglass.
Parent Unit: Seascale Glacigenic Formation (SEAG)
Previous Name(s): Lower Boulder Clay (-2079)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Sea cliff section 500m south of Ravenglass, Cumbria. Merritt and Auton, 2000. 
Reference Section  BNFL Drigg Off-site Borehole C, between 16 and 18m 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.] 
Eastwood T, and others. 1968. Geology of the country around Whitehaven. Memoir of the Geological Survey of Great Britain, Sheet 28 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable