| Computer Code: |
GVA |
Preferred Map Code: |
GV |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Yellow and grey, laminated, shelly, silty sand passing downwards into brownish grey shelly silt and dark brown laminated calcareous clay. Containing cold water marine microfauna of probable mid-Devensian age. |
| Definition of Lower Boundary: |
Gradational, conformable contact with underlying pinkish grey, dusky red and pale reddish brown laminated silt and clay of the Carleton Silt Formation. |
| Definition of Upper Boundary: |
Sharp, planar, unconformable contact with stiff stony diamicton of the Holmrook Till Member of the Blengdale Glacigenic Formation. |
| Thickness: |
To 11.9m |
| Geographical Limits: |
West Cumbria, Wasdale basin and coastal zone immediately to the west (around Drigg and Hall Carleton). |
| Parent Unit: |
British Coastal Deposits Group (COAS)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
BNFL Drigg Off-site Borehole D, from 33.21 to 37.23 m depth. Nirex, 1997. |
| Type Section |
Nirex Borehole QBH2A (SD09NE21), from 49.5 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. |
| 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.] |
| 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 |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
