The BGS Lexicon of Named Rock Units — Result Details

Uriconian Group

Computer Code: UO Preferred Map Code: UV
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Lavas and tuffaceous rocks ranging in composition from basalt through andesite and dacite to rhyolite.
Definition of Lower Boundary: Generally not seen, but probably unconformable on schists and gneisses of Primrose Hill at the Wrekin.
Definition of Upper Boundary: Varies, but unconformable beneath basal Cambrian quartzites at the Wrekin.
Thickness: c.2310m (Wrockwardine).
Geographical Limits: Welsh Borderland.
Parent Unit: Not Applicable (-)
Previous Name(s): Uriconian Group [Obsolete Code: Use UO] (U)
Uriconian Group [Undifferentiated] (-1894)
Western Uriconian [Obsolete Name And Code: Part Of UO] (WU)
Andesite (Uriconian Group) [Obsolete Name And Codepart Of UO] (UOA)
Basic Tuffs With Basalts (Uriconian Group) [Obsolete Name And Code: Part Of UO] (UPSB)
Rhyolites (Uriconian Group) [Obsolete Name And Code: Part of UO] (UPRH)
Eastern Uriconian [Obsolete Name And Code: Part Of UO] (EU)
Conglomerate And Grit (Uriconian Group) [Obsolete Name And Code: Part Of UO] (UOCG)
Rhyolite (Uriconian Group) [Obsolete Name And Code: Part of UO] (UOR)
Tuff (Uriconian Group) [Obsolete Name And Code: Part Of UO] (UOT)
Tuffs And Agglomerates (Uriconian Group) [Obsolete Name And Code: Part Of UO] (UPTA)
Uriconian Volcanic Group (*954)
Uriconian Group (UO)
Alternative Name(s): Uriconian Group
Stratotypes:
Type Area  Western Uriconian outcrops (west of the Church Stretton Fault). Chittol, Linley Hill and Pontesford Hill. 
Type Area  Eastern Uriconian outcrops (east of the Church Stretton Fault). Hope Bowdler Hill, Caer Caradoc, The Lawley, Hazler Hill, Cardington Hill, Charlton Hill, Wrockwardine and the Wrekin. 
Reference(s):
Pocock R W, Whitehead T H, Wedd C B and Robertson T. 1938. Shrewsbury District including the Hanwood Coalfield. Memoir of the Geological Survey of Great Britain, England and Wales. (London: H.M.S.O.). 
Pharaoh T C and Gibbons W. 1994. Precambrian rocks in England and Wales south of the Menai Strait Fault System. 85-97 in Gibbons W and Harris A L (editors), A revised correlation of Precambrian rocks in the British Isles. Geological Society of London Special Report No.22. 
Calloway, C, 1886. On some derived fragments in the Longmynd and newer Archaen rocks of Shropshire. Quarterly Journal of the Geological Society, London, Vol.42, 481-485. 
Boulton, W S, 1904. The igneous rocks of Pontesford Hill (Shropshire). Quarterly Journal of the Geological Society of London, Vol.60, 450-486. 
Greig, D C and others, 1989. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Memoirs of the Geological Survey of Great Britain. 
Pauley J C. 1991. A revision of the stratigraphy of the Longmyndian Supergroup, Welsh Borderland, and of its relationship to the Uriconian volcanic complex. Geological Journal, Vol. 26, 167-183. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E165 E152