| Computer Code: |
LONG |
Preferred Map Code: |
BwL |
| Status Code: |
Full |
| Age range: |
Bathonian Age (JN)
— Bathonian Age (JN) |
| Lithological Description: |
Pale grey to off-white or brownish, more or less argillaceous packstones and wackestones, with grainstone intercalations, thin marls and mudstones, generally fossiliferous notably with Praeexogyra hebridica (Forbes),and bivalves such as Modiolus. |
| Definition of Lower Boundary: |
The base of the limestones described, overlying limestones with Kallihynchia sharpi, of the Roade Member. |
| Definition of Upper Boundary: |
Generally a sharp boundary with mudstone of the Blisworth Clay Formation. |
| Thickness: |
Typically from about 4 m to 7m thick (Cripps, 1986). |
| Geographical Limits: |
The Kettering to Stamford area. |
| Parent Unit: |
Blisworth Limestone Formation (BWL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Longthorpe Road Cutting,Peterborough. Cripps, 1986. |
| Reference Section |
Primary reference section: Thrapston Quarry. Torrens,1968; Cripps,1986; Cox, B M, and Sumbler, M G. 2002. |
| Reference Section |
Spires Wood Quarry. Torrens,1967,1968; Cripps,1986. |
| Reference(s): |
| Torrens, H S. 1968. The Great Oolite Series. 227-263 in Sylvester-Bradley, P C and Ford, T D (editors), The geology of the East Midlands. (Leicester: Leicester University Press.) |
| Cox, B M, and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No. 26. (Peterborough: Joint Nature Conservation Committee.) |
| Cripps, D W. 1986. A facies analysis of Upper Great Oolite Group in Central and Eastern England. (University of Aston in Birmingham: Unpublished PhD thesis.) |
| Torrens, H S, 1967. The Great Oolite Limestone of the Midlands. Transactions of the Leicestershire Literary and Philosophical Society, Vol.61, 65-90. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E157
E171
|
