The BGS Lexicon of Named Rock Units — Result Details

Colwall Gelifluctate Formation

Computer Code: CGEL Preferred Map Code: CG
Status Code: Pending Upgrade
Age range: Wolstonian Stage (QO) — Wolstonian Stage (QO)
Lithological Description: Stiff, mainly yellow-brown gravelly silty clay or clayey silt with angular clasts of local lithologies.
Definition of Lower Boundary: Placed at junction of Beds 6 and 7 in augerholes at Colwall, where stony clay of the Colwall Gelifluctate overlies sandy silt/clay of the Cradley Silts (Barclay, et al, 1992).
Definition of Upper Boundary: Not generally seen, but placed at junction with overlying younger solifluction or alluvial deposits.
Thickness: Up to c.2 metres.
Geographical Limits: Cradley - Glynch Brook Valleys in Mathon - Colwall area, Herefordshire.
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Warner's Farm Gravel Pit (now obscured). 
Type Section  2 British Geological Survey augerholes (on same site) near Colwall, 500 metres west of Barton Farm. 
Reference(s):
Barclay, W J, et al, 1990. Details of the Pleistocene deposits in the Malvern Hills area. British Geological Survey Technical Report, WA/90/92. 
Barclay, W J, Brandon, A, Ellison, R A and Moorlock, B S P. 1992. A Middle Pleistocene palaeovalley-fill west of the Malvern Hills. Journal of the Geological Society of London, Vol. 149, 75-92. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E199