| Computer Code: |
BLGL |
Preferred Map Code: |
BLG |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Interbedded units of gravelly sandy clay diamicton, sand, gravel, silt and clay, typically reddish brown, with clasts mainly of Borrowdale Volcanic Group rocks (rhyolite, welded tuff, slate), granite and granophyre from the Lake District. |
| Definition of Lower Boundary: |
Sharp, irregular, unconformable contact of diamicton on bedrock, or undulating to planar, unconformable contact of diamicton on laminated silt and clay of the Stubble Green Silt or Carleton Hall Clay members of the Glannoventia Formation. |
| Definition of Upper Boundary: |
Ground surface, or sharp, undulating, unconformable contact of diamicton with overlying dark brown laminated clay of the Whinneyhill Coppice Clay Member of the Aikbank Farm Glacigenic Formation. |
| Thickness: |
To 20m |
| Geographical Limits: |
Western side of the Lake District and at depth beneath Lower Wasdale. |
| Parent Unit: |
Central Cumbria Glacigenic Subgroup (CCGL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Waterfall in deep gulley on eastern side of Blengdale, Lake District, 120m downstream of Bleng Bridge (exposing Holmbrook Till Member only). BGS registered section NY00NECA701; Nirex 1977. |
| Partial Type Section |
BGS registered borehole SD19NW11 (Aikbank Farm Borehole 1), from 49.2 to 55.1m depth. Nirex, 1997 |
| 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. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
