| Computer Code: |
CHCL |
Preferred Map Code: |
CHC |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Silty clay, calcareous, laminated, very stiff, dark brown (Munsell Soil), with sparse dropstone pebbles and cold marine microflora. Laminae are stacked within graded, rhythmic units. |
| Definition of Lower Boundary: |
Gradational, conformable contact with underlying laminated silt and clay of the Carleton Silt Formation. |
| Definition of Upper Boundary: |
Gradational, conformable contact with brownish grey sandy silt of the Stubble Green Silt Member of the Glannoventia Formation, or, sharp, planar, unconformable contact with stony diamicton of the Holmrook Till Member of the Blengdale Glacigenic Formation. |
| Thickness: |
To 11.9m |
| Geographical Limits: |
West Cumbria. |
| Parent Unit: |
Glannoventia Formation (GVA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Nirex Borehole QBH20 (SD09NE22) from 26.6 to 47.4m depth. Nirex 1997. |
| Type Section |
Nirex Borehole QBH2A (SD09NE21), from 51.8 to 56.3 m depth. Nirex 1997. |
| Reference(s): |
| 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. |
| 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.] |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
