The BGS Lexicon of Named Rock Units — Result Details

Benton Volcanic Group

Computer Code: PBV Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Spherulitic and autobrecciated lavas of sodic rhyolite and trachyte with subordinate red and green sillicic tuffs.
Definition of Lower Boundary: Unknown, possibly faulted.
Definition of Upper Boundary: Unknown, possibly faulted.
Thickness: Unknown.
Geographical Limits: South west Wales, Pembrokeshire, Haverfordwest district.
Parent Unit: Not Applicable (-)
Previous Name(s): Benton Volcanic Series (-1755)
Benton Series (-2968)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Outcrops immediately to west of Benton Castle, Lawrenny, Pembrokeshire. Strahan et al., 1914. 
Reference Section  Outcrops around Great Westfield, 1.3km east of Rosemarket, Pembrokeshire. Baker, 1982. 
Reference(s):
Baker J W. 1971. The Precambrian rocks of Pembrokeshire. 170-179 in Geological Excursions in South Wales and the Forest of Dean. Bassett M G (editors). (Cardiff: Geologists' Association, South Wales Group.) 
Baker, J W. 1982. The Precambrian of south-west Dyfed. 15-25 in Geological Exclusions in Dyfed, South-west Wales. Bassett, M G (Editor). (Cardiff: National Museum of Wales). 
Bevins, R E, Pharaoh, T C, Cope, J C W and Brewer, T S. 1985. Geochemical character of Neoproterozoic volcanic rocks in southwest Wales. Geological Magazine, Vol.132, 339-349. 
Shackleton, R M. 1975. Precambrian rocks of Wales. 76-83 in A correlation of Precambrian rocks in the British Isles. Harris, A L, and others (editors). Geological Society of London Special Report No. 6. 
Strahan A, Cantrill T C, Dixon E E L, Thomas H H and Jones O T. 1914. The geology of the South Wales Coalfield. Part XI. The country around Haverfordwest. Memoir of the Geological Survey of Great Britain. (London: HMSO). 262pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable