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 Volcanic Group [Obsolete Name and Code: Use UO]
(*954)
Uriconian Group (UO) Western Uriconian [Obsolete Name And Code: Part Of UO] (WU) Uriconian Group [Undifferentiated] [Obsolete Name and Code: Use UO] (-1894) Andesite (Uriconian Group) [Obsolete Name And Codepart Of UO] (UOA) Basic Tuffs With Basalts (Uriconian Group) [Obsolete Name And Code: Part Of UO] (UPSB) 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 Group [Obsolete Code: Use UO] (U) Rhyolites (Uriconian Group) [Obsolete Name And Code: Part of UO] (UPRH) Eastern Uriconian [Obsolete Name And Code: Part Of UO] (EU) Uriconian Group (UO) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| 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. | ||
| Type Area | Western Uriconian outcrops (west of the Church Stretton Fault). Chittol, Linley Hill and Pontesford Hill. | ||
| Reference(s): | |||
| 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. | |||
| 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. | |||
| 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.). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E165 E152 | |||