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 Series (-2968)
Benton Volcanic Series (-1755)
Alternative Name(s): none recorded or not applicable
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. 
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. 
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. 
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. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable