| Computer Code: |
BNTI |
Preferred Map Code: |
BNTI |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
The typical lithology is a glacially organized diamicton (till), composed of isolated boulders, gravel and pebbles in a matrix of sandy silty clay. The more elongated clasts are preferentially oriented and the deposit commonly has systematic sets of joints. The deposit is of a stiff to hard consistency and low plasticity. In general the colour of till reflects that of the local bedrock so may be totally different from one area to the next and can be reddish brown (Devonian and Upper Coal Measures) or brownish grey or black (Carboniferous). |
| Definition of Lower Boundary: |
Unconformity or glacial deformation boundary on bedrock or on assumed older (usually unclassified) Quaternary strata. |
| Definition of Upper Boundary: |
Unconformity or glacial deformation boundary below younger Quaternary strata. Where data are available the Baillieston Till Formation is overlain by the Broomhill Clay Member and/or the Cadder Sand Member of the Wilderness Till Formation or this till itself. |
| Thickness: |
Veneer to more than 20m. |
| Geographical Limits: |
Central Scotland, related to ice streams sourced in the Highlands (in contrast to the Southern Uplands) during the Devensian some time prior to the Dimlington Stadial; Glasgow area including the Kelvin and Carron-Bonny Water valley system, north and south Lanarkshire, possibly Ayrshire. |
| Parent Unit: |
Midland Valley Glacigenic Subgroup (MVG)
|
| Previous Name(s): |
Baillieston Member [Obsolete Name and Code: Use BNTI]
(-2630)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Clyde valley between Erskine Bridge [NS 450 730] and Baillieston Interchange [NS 700 640]. Browne and McMillan (1989a). |
| Reference(s): |
| Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. |
| Browne, M A E, and McMillan, A A. 1989a. Quaternary geology of the Clyde valley. British Geological Survey Research Report, SA/89/1. |
| McMillan, A A, Hamblin, R J O and Merritt, J W. 2005. An overview of the lithostratigraphical framework for the Quarternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report RR/04/04. |
| Browne, M A E, and McMillan, A A. 1989b. Geology for land use planning: drift deposits of the Clyde valley Volume 1: Planning Report. British Geological Survey Technical Report WA/89/78. |
| Hall, I H S, Browne, M A E and Forsyth, I H. 1998. Geology of the Glasgow district. Memoir of the British Geological Survey, Sheet 30E (Scotland). |
| Cameron, I B, Aitken, A M, Browne, M A E and Stephenson, D. 1998. Geology of Falkirk District. Memoir of the British Geological Survey Sheet 31E (Scotland). |
| Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Airdrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
