| Computer Code: |
ARFS |
Preferred Map Code: |
ARFS |
| Status Code: |
Full |
| Age range: |
Tournaisian Age (CT)
— Visean Age (CV) |
| Lithological Description: |
Green to grey, fine- to medium-grained, laminated or cross laminated sandstone in beds up to 1.7 m thick, with pebble-rich lenses and shelly lags with Lingula fragments and seams up to several centimetres thick, consisting of green mudstone and siltstone with Lingula. All lithologies are seen as rip-up clasts in the basal parts of the sandstone beds. The upper part of the formation comprises coarse-grained, calcareous sandstone, with pedogenic fabrics, and conglomerate. |
| Definition of Lower Boundary: |
A sharp, conformable base of green to grey, fine- to medium-grained sandstone with Lingula, of the Arch Farm Sandstone Formation, above the brown to green-grey medium to coarse-grained sandstone and conglomerate of the Calke Abbey Sandstone Formation; seen as a prominent step on gamma-ray logs. |
| Definition of Upper Boundary: |
The top of a medium- to coarse-grained pebbly sandstone, overlain by green, slickensided, smectite-rich mudstone with about 4 mm ferruginous concretions of the Arch Farm Sandstone Formation, sharply overlain by pale grey to white calcareous sandstone of the Cloud Hill Dolostone Formation. |
| Thickness: |
Measured as 9 m thick in the Ticknall Borehole. |
| Geographical Limits: |
Present in the subsurface in the area of Hathern Shelf, Loughborough District [SK32]. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
BGS Ticknall Borehole (SK32SE/103), at between 101.3 m and 92.3 m depth, displaying the entire thickness of the formation. |
| Reference(s): |
| Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. |
| 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). |
| Ambrose, K, and Carney, J N. 1997. Geology of the Calke Abbey area: 1:10 000 Sheet SK32SE. BGS Technical Report WA/97/17. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E141
|
