The BGS Lexicon of Named Rock Units — Result Details

Quartzitic Sandstone Formation

Computer Code: QSG Preferred Map Code: notEntered
Status Code: Pending Upgrade
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 (-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):
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