| Computer Code: |
BHSE |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Three members are identified, the Greenoakhill Sand and Gravel, Ross Sand and Bellshill Clay. Lithological associations of the Greenoakhill Sand and Gravel are of rare matrix-supported bouldery gravel with sand, common framework-supported bouldery gravel with sand and pebbly coarse- to fine-grained sand, silt and clay. The most abundant is sand. The unit varies from loose to very dense and is up to 25m thick. Much of the gravel is massive to crudely bedded but planar beds and trough cross-bedded units are present. Sands are planar and trough cross-bedded, and ripple and horizontally laminated. Deformed bedding (including reverse faults and folds) probably marks the former contacts with dead-ice. The coarsest gravels were deposited by meltwaters flowing through tunnels in the wasting ice, massive deposits may have been laid down in the full-pipe sliding bed phase of water transport but most show cross-bedding features consistent with fluviodeltaic processes. Sandy clay diamictons might have been formed as debris flows in a fluvial context. The Bellshill Clay Member comprises silty clay with wisps, laminae and bands of silt, and the Ross Sand Member is predominantly flat and ripple laminated, medium- to fine-grained sand with bands of silt. |
| Definition of Lower Boundary: |
Unconformably on bedrock or most commonly on older Quaternary strata particularly the Wilderness Till Formation of the Midland Valley Glacigenic Subgroup. |
| Definition of Upper Boundary: |
Unconformably below younger Quaternary strata such as the Clyde Clay Formation but also exposed at surface. |
| Thickness: |
Veneer about 25m. |
| Geographical Limits: |
Central Scotland; Glasgow area, Stirling, Clackmannan, Tayside, north and south Lanarkshire, Lothians and Edinburgh, Fife and probably also Ayrshire. |
| Parent Unit: |
Midland Valley Glacigenic Subgroup (MVG)
|
| Previous Name(s): |
Broomhouse Formation [Obsolete Name and Code: Use BHSE, GOHL]
(-4462)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Broomhouse, eastern Glasgow. |
| Reference(s): |
| Browne, M A E, and McMillan, A A. 1989a. Quaternary geology of the Clyde valley. British Geological Survey Research Report, SA/89/1. |
| 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). |
| 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. |
| Paterson, I B, McAdam, A D and MacPherson, K A T. 1998. Geology of the Hamilton district. Memoir of the British Geological Survey, Sheet 23W (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 |
