The BGS Lexicon of Named Rock Units — Result Details
Balloch Clay Member
| Computer Code: | BOCH | Preferred Map Code: | BOCH |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Devensian Stage (QD) — Devensian Stage (QD) | ||
| Lithological Description: | Clayey silt, clay and sand, mid to dark grey, bedded and thinly laminated in places, with dark sulphide patches and fine mica; very soft to soft consistency and medium to low plasticity, isolated clasts up to 3cm (presumed dropstones), some graded units, sulphide patches, rare marine shells and plant remains. | ||
| Definition of Lower Boundary: | The Ballock Clay Member of the Clyde Clay Formation rests with angular unconformity on older Quaternary sediments or bedrock. It normally rests on the Inverleven Gravel Member of the Clyde Clay Formation or possibly on the Wilderness Till Formation (WITI) of the Caledonia Glacigenic Group (Midland Valley Glacigenic Subgroup). | ||
| Definition of Upper Boundary: | The Balloch Clay Member of the Clyde Clay Formation is overlain unconformably by younger Quaternary sediments, normally the Clydebank Clay Formation of the British Coastal Deposits Group but will include buried deposits belonging to the deglacial phase at the end of the Loch Lomond Stadial. | ||
| Thickness: | Veneer to more than 40m. | ||
| Geographical Limits: | The Balloch Clay Member of the Clyde Clay Formation is recognized in the Leven valley south of Loch Lomond. | ||
| Parent Unit: | Clyde Clay Formation (CLYD) | ||
| Previous Name(s): | Balloch Formation [Obsolete Name and Code: Use BOCH]
(-2005)
Balloch Member (-71) Clyde Beds [Obsolete Name and Code: Use PRTS, BOCH, LIWD, PAIS, KARN, CLYD] (-1375) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Leven valley south of Loch Lomond from Balloch to Dumbarton. Browne and McMillan (1989a) | ||
| Reference Section | The BGS Inverleven Borehole. Browne and McMillan (1989a, Figure 9). | ||
| Reference(s): | |||
| 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). | |||
| 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. 1989b. Geology for land use planning: drift deposits of the Clyde valley Volume 1: Planning Report. British Geological Survey Technical Report WA/89/78. | |||
| Jardine, W G (Editor). 1980. Glasgow Region: Field Guide. [Quaternary Reseach Association.] | |||
| 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. 1989a. Quaternary geology of the Clyde valley. British Geological Survey Research Report, SA/89/1. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||