| Computer Code: |
CUS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Dimlington Stadial (QDD)
— Dimlington Stadial (QDD) |
| Lithological Description: |
Interbedded silty clay, sandy silt, and silty sand, forming upward coarsening flat-lying units; generally moderate reddish brown to brown or greyish brown. Sandy silts and silty clays are typically thinly bedded in finely-laminated to massive beds; silty sands display planar lamination, ripple lamination and small-scale tabular cross-bedding. Rounded greywacke drop-stone cobbles disrupt the lamination in silt and clay units at the Partial Type Section. |
| Definition of Lower Boundary: |
Either overlies bedrock or red-brown diamicton of the Gretna Till Formation. Base of unit is not exposed at the Partial Type Section. |
| Definition of Upper Boundary: |
Taken at the base of the Kilblane Sand and Gravel Formation at the Partial Type Section; overlain by red-brown diamicton of the Gretna Till Formation in the Reference Section. |
| Thickness: |
Typically 3-5 m, but greater than 10 m proved in boreholes south of Canonbie. |
| Geographical Limits: |
Northern margin of the Solway Firth, principally between Dumfries and Gretna, but extending inland to Dalswinton and Canonbie. These deposits also occur concealed beneath the alluvial sediments of the River Esk between Gretna and Carlisle. |
| Parent Unit: |
Irish Sea Coast Glacigenic Subgroup (ISCG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Section in Locharbriggs Sand and Gravel Pit. BGS Registered Section CA1320 about 250 m south-east of Cullivait House, Dumfries and Galloway.
Section in interbedded moderate reddish brown fine-sand and laminated clayey silt with drop-stone cobbles, beneath kettled kame terrace gravel (Kilblane Sand and Gravel Formation), exposed in working face in August 1999. |
| Reference Section |
BGS Registered Borehole NY37NE 1, about 1 km south-south-east of Canonbie, Dumfries and Galloway (A7 Improvement-Canonbie Site Investigation Record SE 1054, Borehole 4).
10.3 m of laminated silt and clay, occuring beneath 6.2 m of red-brown till and resting on 3 m of red-brown till of the Gretna Till Formation. |
| Reference(s): |
| McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. |
| British Geological Survey. 2005. Solway East. Scotland Special sheet. Superficial Deposits and Simplified Bedrock. 1:50 000 Geology Series. |
| British Geological Survey. 2005. Solway West. Scotland Special sheet. Superficial Deposits and Simplified Bedrock. 1:50 000 Geology Series. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E017
S010
S010
S009
|
