| Computer Code: |
LOE |
Preferred Map Code: |
LE |
| Status Code: |
Full |
| Age range: |
Chadian Substage (CI)
— Asbian Substage (CR) |
| Lithological Description: |
Dark grey or brown calcareous mudstones and siltstones, with thin beds of bioclastic limestone, graded calcisiltite, packstone and grainstone (description from borehole chip samples). |
| Definition of Lower Boundary: |
The base is not proved by borehole, although known locally in the Long Eaton No. 1 Borehole to pass down to nodular anhydrite and interbedded dolostone, possibly a lateral equivalent of the Hathern Anhydrite Formation. |
| Definition of Upper Boundary: |
The base of lowest, thickly bedded turbiditic limestone of the Lockington Limestone Formation. |
| Thickness: |
At least 2060m, and possibly up to 4000m thick in the Widmerpool Half-Graben. |
| Geographical Limits: |
Does not appear at outcrop, but lies at depth within the Hathern Shelf and possibly the Widmerpool Half-Graben, in the Long Eaton No. 1 Borehole (SK43SE/161) [SK 4640 3166]. |
| Parent Unit: |
Craven Group (CRAV)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Long Eaton No.1 Borehole (SK43SE/161), partially cored, from 880m to 2747m depth. |
| Reference Section |
Ratcliffe on Soar Borehole (SK52NW/72), from 1157m to 1832m depth. |
| Reference(s): |
| Brandon, A. 1996. Geology of the Lower Derwent Valley: 1:10 000 Sheets SK33SE, SK43SW and SK43SE. British Geological Survey Technical Report WA/96/07. |
| Carney, J N, Ambrose, K and Brandon, A. 2001. Geology of the country between Burton, Loughborough and Derby. Description of 1:50k Sheet 141 (England and Wales). |
| Riley, N J. 1997. Forminiferal biostratigraphy of the Carboniferous interval in Fina Long Eaton No.1 Borehole. British Geological Survey Technical Report, WH/97/46C. |
| Carney, J N and Cooper, A H. 1997. Geology of the West Leake area: 1:10 000 Sheet SK52NW. British Geological Survey Technical Report WA/97/46. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E141
|
