The BGS Lexicon of Named Rock Units — Result Details

Bettisfield Formation [Obsolete: use PCM]

Computer Code: BTD Preferred Map Code: notEntered
Status Code: Full
Age range: Langsettian Substage (CA) — Bolsovian Substage (CC)
Lithological Description: [Obsolete: use PCM] Grey and dark grey mudstones with subsidiary feldspathic sandstones, siltstones, seatearths (fireclays) and coal seams.
Definition of Lower Boundary: At junction (conformable) with underlying Gwespyr Sandstone (Halkyn Formation).
Definition of Upper Boundary: At junction (conformable, diachronous) with overlying Buckley Formation.
Thickness: Up to c.400 metres.
Geographical Limits: Flintshire Coalfield, North Wales. Possible extension to all the North Wales Coalfields.
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Bettisfield Colliery No.2 Shaft. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E108