| Computer Code: |
LWTI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Stony sandy clay diamicton, matrix-supported, massive, very stiff, weak red, dark greyish brown to yellowish brown, with sand (? as lenses) locally. Typical lodgement till, with angular to subrounded clasts up to boulder size. Clasts derived from the northwest of the Lake District (olive brown ?Latterbarrow Sandstone, slate, limestone and granophyre) but locally dominated by clasts of the underlying red sandstone bedrock. |
| Definition of Lower Boundary: |
Not seen at its type or reference sections but assumed to be unconformable on bedrock. |
| Definition of Upper Boundary: |
At its type section it is unconformably overlain by glaciofluvial gravel and at its reference section (at Rothersyke Scar river cliff) it is overlain by the Catgill Wood Sand and Gravel Member of the Seascale Glacigenic Formation. |
| Thickness: |
c.1.8m exposed at type section, but up to 20m thick in adjacent boreholes. |
| Geographical Limits: |
1:50k Sheet 37 Gosforth. Cleator Moor - Egremont area (Seaward of the 'Gosforth Oscillation Limt'), Western Cumbria. |
| Parent Unit: |
Seascale Glacigenic Formation (SEAG)
|
| Previous Name(s): |
Lower Boulder Clay [Obsolete Name and Code: Use CHAK, STIL, SEAG, RVTI, LWTI, STPTG]
(-2079)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
River cliff on the western side of the River Ehen, 70m northeast of Low Wath Farm, 300m southeast of Cleator Moor, west Cumbria. Nirex Science Report SA/97/045 (Issue 2.0) 1997. |
| Reference Section |
Base of "Rothersyke Scar", river cliff section, western side of River Ehen, between Rothersyke House and Low Mill; c.300m west of Thornhill village, west Cumbria. Nirex Science Report SA/97/045 (Issue 2.0) 1997. |
| Reference(s): |
| 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.] |
| Eastwood T, and others. 1968. Geology of the country around Whitehaven. Memoir of the Geological Survey of Great Britain, Sheet 28 (England and Wales). |
| 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, Auton, C A, Browne, M A E, Neilson, G and McMillan, A A. 1995. Characterisation of the onshore Quaternary deposits around Sellafield, Cumbria, Phase II. Nirex Science Report 768. |
| 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 |
