The BGS Lexicon of Named Rock Units — Result Details

Vexford Breccias

Computer Code: VBR Preferred Map Code: notEntered
Status Code: Full
Age range: Triassic Period (T) — Triassic Period (T)
Lithological Description: Angular and subangular fragments of sandstone, slate and quartz in a sandy matrix whose grains are mostly angular, but locally rounded. Locally rounded fragments are found including Carboniferous limestone. The breccias are generally well cemented. Interbedded sandstones are present up to 1m thick. The Breccias generally form a distinct scarp feature.
Definition of Lower Boundary: Underlain by the Wiveliscombe Sandstones. Boundary marked by lithology change form mainly sandstone to include breccia.
Definition of Upper Boundary: Overlain by the Littleham Mudstone. Boundary marked by change in lithology to mudstone.
Thickness: 20-40m.
Geographical Limits: Taunton district, Somerset.
Parent Unit: Aylesbeare Mudstone Group (AYB)
Previous Name(s): Breccio-Conglomerate (-3111)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Cuttings of the West Somerset Railway either side of Stogumber Station. Edmonds and Williams, 1985. 
Partial Type Section  Exposures around Vellow Wood Farm, near Stogumber. Edmonds and Williams, 1985. 
Reference(s):
Edmonds, E A and Williams, B J, 1985. Geology of the country around Taunton and the Quantock Hills. Memoir of the British Geological Survey, Sheet 295. (England and Wales). 
Ussher, W A E. 1908. The geology of the Quantock Hills and of Taunton and Bridgewater. Memoir of the Geological Survey of Great Britain. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E295