| Computer Code: |
BDMO |
Preferred Map Code: |
BM |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Typically yellowish brown, crudely bedded, angular to well-rounded clasts, with extremely variable sorting, of both matrix- and clast-supported clayey gravel, with boulders and sandy diamicton, composed of psammite, metagreywacke, granite and quartzite, with some gneiss, slate and dolerite, elsewhere locally formed of mainly granite or gabbroic rocks, forming hummocky ground and cross-valley moraine ridges. |
| Definition of Lower Boundary: |
Generally a sharp, undulating, unconformable contact with a yellowish brown, gravelly clayey sand diamicton of the Banchory Till Formation and other sandy tills of the East Grampian Glacigenic Subgroup. |
| Definition of Upper Boundary: |
Generally the present ground surface. |
| Thickness: |
To 10m |
| Geographical Limits: |
East Aberdeenshire: sheets S76E, S77, S66E, S67. |
| Parent Unit: |
East Grampian Glacigenic Subgroup (EGD)
|
| Previous Name(s): |
Hummocky glacial deposits undivided [Obsolete Name and Code: Use BDMO]
(-2593)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Sand and gravel pit section at Blairdaff, 4 km NW of Kemnay, Aberdeenshire. Merritt et al., 2003, p.84, plate 9. |
| Reference Section |
Exposure in bank in forestry track 300m north of Toll Farm, 11km northwest of Aberdeen. Geologist's field locality CA 1340, in BGS field locality database. |
| Reference(s): |
| Merritt, J W, Auton, C A, Connell, E R, Hall, A M and Peacock, J D. 2003. The Cainozoic geology and landscape evolution of north-east Scotland. Memoir of the British Geological Survey, Sheets 66E, 67, 76E, 77, 86E, 87W, 87E, 95, 96W, 96E and 97 (Scotland) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S077
S066
S067
S076
|
