| Computer Code: |
QSG |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pendleian Substage (CE)
— Yeadonian Substage (CY) |
| Lithological Description: |
Hard pale grey quartzitic sandstones with grey mudstones, seatearths and thin carbonaceous or coaly beds. |
| Definition of Lower Boundary: |
Incoming of mudstones and sandstones at the top of the Carboniferous Limestone (Pembroke Limestone Group). |
| Definition of Upper Boundary: |
Ashton Vale Marine Band. (Gastrioceras subcrenatum Marine Band). |
| Thickness: |
200m |
| Geographical Limits: |
Bristol area. (Wells- Bath - Bristol - Wickwar). |
| Parent Unit: |
Marros Group (MARR)
|
| Previous Name(s): |
Quartzitic Sandstone Group [Obsolete Name and Code: Use QSG]
(-2386)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
British Geological Survey Ashton Park Borehole [ST57SE/73], Ashton Court Estate next to the A370, behind the Smith Arms. |
| Reference(s): |
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
| Kellaway, G A and Welch, F B A. 1993. Geology of the Bristol district. Memoir of the British Geological Survey Special Sheet [England and Wales]. |
| Kellaway, G A and Welch, F B A. 1955. The Upper Old Red Sandstone and Lower Carboniferous rocks of the Bristol and the Mendips compared with those of Chepstow and the Forest of Dean. Bulletin of the Geological Survey of Great Britain, No.9, p.1-21. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E281
E280
E264
E250
E265
|
