| Computer Code: |
BKHM |
Preferred Map Code: |
Bkg |
| Status Code: |
Full |
| Age range: |
Sinemurian Age (JS)
— Sinemurian Age (JS) |
| Lithological Description: |
Bluish-grey shaly mudstones, with rare thin limestones comprising a few per cent of the sequence. |
| Definition of Lower Boundary: |
Top of highest limestone in Granby Member. |
| Definition of Upper Boundary: |
Base of (ferruginous) Stubton Limestones in Foston Member, (see Brandon and others, 1990, for details of Stubton Limestones and other beds within Members). |
| Thickness: |
21m to 24m; 22.10m in borehole F/B5. |
| Geographical Limits: |
East Midlands Shelf; thickens southwards towards London Platform; northwards, limestone beds develop within mudstone sequence. |
| Parent Unit: |
Scunthorpe Mudstone Formation (SMD)
|
| Previous Name(s): |
Bucklands Clays [Obsolete Name and Code: Use BKHM]
(-2613)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Fulbeck Airfield Borehole F/B1 (SK85SE/25), depths 17.9m to 40.5m. |
| Type Section |
Fulbeck Airfield Borehole F/B5 (SK95SW/17), depths 34.65m to 56.75m. |
| Reference(s): |
| Sumbler, M G, 1987. Geological Notes and Local Details for 1:10,000 Sheet SK85SE (Beckingham). British Geological Survey Technical Report. |
| Brandon, A, Sumbler, M G, and Ivimey-Cook, H C. 1990. A revised lithostratigraphy for the Lower and Middle Lias (Lower Jurassic) east of Nottingham, England. Proceedings of the Yorkshire Geological Society, Vol. 48, 121-141. |
| Sumbler, M G, 1987. Geological Notes and Local Details for 1:10,000 Sheet SK95SW (Brant Broughton). British Geological Survey Technical Report. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E127
E142
|
