| Computer Code: |
CLPL |
Preferred Map Code: |
Cp |
| Status Code: |
Full |
| Age range: |
Hettangian Age (JH)
— Hettangian Age (JH) |
| Lithological Description: |
Two c 0.25m limestone units, separated by c 1m of mudstone beds with nodular limestone beds in the upper part. The limestone beds are shelly, medium grey, argillaceous packstone/grainstone. Fauna includes forams, bivalves, ammonites, ostracods and echinoderms. The lower part forms a positive feature. |
| Definition of Lower Boundary: |
Change up from grey, calcareous mudstone with rare thin limestones of the undifferentiated Granby Member; at 71.78m depth in type section Fulbeck Airfield Borehole f/B5 (SK95SW/17). |
| Definition of Upper Boundary: |
Change up into grey, calcareous mudstone of the undifferentiated Granby Member; at 70.30m depth in type section Fulbeck Airfield Borehole f/B5 (SK95SW/17). |
| Thickness: |
1.48 to 3m; 1.48m in type section. |
| Geographical Limits: |
East Midlands; north Leicestershire to Lincolnshire. Not recognised in north Lincolnshire, or south Leicestershire, where it may pass south into part of the more argillaceous and less bioclastic Rugby Limestone Member of the Blue Lias Formation (Ambrose, 2001). |
| Parent Unit: |
Granby Member (GRBL)
|
| Previous Name(s): |
Claypole Limestone [Obsolete Name and Code: Use CLPL]
(-3307)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Fulbeck Airfield Borehole F/B5 (SK95SW/17). |
| Reference(s): |
| 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. |
| Carney, J N, Ambrose, K and Brandon A. 2002. Geology of the Melton Mowbray district - a brief explanation of the geological map. British Geological Survey Sheet Explanation, Sheet 142 (England and Wales). |
| Ambrose, K. 2001. The lithostratigraphy of the Blue Lias Formation (Late Rhaetian-Early Sinemurian) in the southern part of the English Midlands. Proceedings of the Geologists' Association, Vol. 112, 97-110. |
| Berridge, N G, Pattison, J, Samuel, M D A, Brandon, A, Howard, A S, Pharaoh, T C, and Riley, N J. 1999. Geology of the Grantham district. Memoir of the British Geological Survey, sheet 127 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E127
E142
E126
|
