| Computer Code: |
CAAS |
Preferred Map Code: |
CAS |
| Status Code: |
Full |
| Age range: |
Visean Age (CV)
— Visean Age (CV) |
| Lithological Description: |
Brown to green-grey, medium to thick-bedded, medium- to coarse-grained sandstones, pebbly sandstones and conglomerates with low angle cross-bedding, with laminated to thinly bedded sequences of green or red mudstone and siltstone and thin, sharp-based and graded sandstone beds. Numerous reddened beds of poorly sorted structureless mudstone, siltstone and argillaceous sandstone with red to grey mottles along roots. |
| Definition of Lower Boundary: |
Unconformity with weathered, green mudstones of the Stockingford Shale Group, overlain by 13 m of thick basal conglomerate, commonly containing volcanic pebbles. |
| Definition of Upper Boundary: |
Marine flooding surface, overlain by green to grey, fine- to medium-grained sandstone with pebble-rich lenses, and shelly lags of Lingula of the Arch Farm Sandstone Formation. |
| Thickness: |
Measured as 70.6 m thick in the Ticknall Borehole. |
| Geographical Limits: |
Not present at outcrop, but seen in the subsurface in the area of Hathern Shelf, Loughborough District [SK 32]. |
| 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], between 101.3 m and 171.92 m depth, comprising the entire thickness of the formation. |
| Reference(s): |
| Ambrose, K, and Carney, J N. 1997. Geology of the Calke Abbey area: 1:10 000 Sheet SK32SE. BGS Technical Report WA/97/17. |
| 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). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E141
|
