| Computer Code: |
AW |
Preferred Map Code: |
AW |
| Status Code: |
Full |
| Age range: |
Cisuralian Epoch (PLC)
— Cisuralian Epoch (PLC) |
| Lithological Description: |
Red-brown mudstone with subordinate, but locally thick, beds of red-brown and grey-green, fine- to medium-grained sandstone. |
| Definition of Lower Boundary: |
Taken at the incoming of a thick succession of red mudstone (50 to 65m thick) above the Kenilworth Sandstone Formation. |
| Definition of Upper Boundary: |
Taken at the base of the unconformable Bromsgrove Sandstone Formation (Triassic) in the type area. |
| Thickness: |
Up to 250m in Sandy Lane and Barford boreholes. |
| Geographical Limits: |
Southern part of the Warwickshire Coalfield. |
| Parent Unit: |
Warwickshire Group (WAWK)
|
| Previous Name(s): |
Ashow Group [Obsolete Name and Code: Use AW]
(-3184)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Warwick and the southern part of the Warwickshire Coalfield. The upper part of the formation around Warwick is poorly exposed, and occurs in fault-bounded inliers; as a result details of the succession and thickness are uncertain. |
| Reference Section |
Cherry Orchard Brickworks, Kenilworth (Richardson and Fleet, 1926; Shotton, 1929; Old et al., 1987); lower part of formation. |
| Reference Section |
(c). Guys Cliffe Chapel pit; upper part of formation. |
| Reference Section |
(d). Tachbrook Mallory Borehole (Richardson, 1928).(SP 36 SW/13). |
| Reference Section |
(e). Sandy Lane Borehole (SP 36 NW/82); from surface to base of formation at 253.8m. |
| Reference Section |
(a). Whitemoor Brickworks, Kenilworth (Richardson and Fleet, 1926; Shotton, 1929; Old et al.,1987); lower part of formation. |
| Reference Section |
(b). Chesford Bridge (Old et al., 1987); sandstones in middle part of formation. |
| Reference(s): |
| Bridge, D M, Carney, J N, Lawley, R S, and Rushton, A W A. 1998. Geology of the country around Coventry and Nuneaton. Memoir of the British Geological Survey, Sheet 169 (England and Wales). |
| Richardson, L. 1928. The wells and springs of Warwickshire. Memoir of the Geological Survey of Great Britain. |
| Eastwood, T, Gibson, W, Cantrill, T C, and Whitehead, T H. 1923. The geology of country around Coventry, including an account of the Carboniferous rocks of the Warwickshire Coalfield. Memoir of the Geological Survey of Great Britain, Sheet 169. (England and Wales). |
| Powell, J H, Chisholm, JI, Bridge, D M, Rees, J G, Glover, B W and Besly, B M. 2000. Stratigraphical framework for Westphalian to Early Permian red-bed successions of the Pennine Basin. British Geological Survey Technical Report WA/99/10. |
| Old, R A, Sumbler, M G and Ambrose, K, 1987. Geology of the country around Warwick. Memoir of the British Geological Survey, Sheet 184 (England and Wales). |
| Old, R A, Bridge, D M and Rees, J G, 1990. Geology of the Coventry area. British Geological Survey Technical Report, WA/89/29 |
| Richardson, L and Fleet, W F. 1926. On sandstones with breccias below the Trias at Stratford-upon-Avon and elsewhere in south Warwickshire. Proceedings of the Geologists' Association, Vol.37, 283-305. |
| Shotton, F W, 1929. The geology of the country around Kenilworth (Warwickshire). Quarterly Journal of the Geological Society of London, Vol.28, 167 - 222. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E184
|
