The BGS Lexicon of Named Rock Units — Result Details
Roch Rhyolitic Group [Obsolete: use RRH]
Computer Code: | PRR | Preferred Map Code: | RRh |
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Status Code: | Index Level | ||
Age range: | Ordovician Period (O) — Ordovician Period (O) | ||
Lithological Description: | [Obsolete: use RRH] Rhyolitic lavas and flinty rhyolitic tuffs. | ||
Definition of Lower Boundary: | Not defined. | ||
Definition of Upper Boundary: | Not defined. | ||
Thickness: | Not defined. | ||
Geographical Limits: | 1:50,000 Sheet 209 (St Davids) and adjacent Sheet 210. | ||
Parent Unit: | none recorded or not applicable | ||
Previous Name(s): | Trefgarn Rhyolitic Series [Obsolete Name and Code: Use RRH, PRR]
(-1774)
Roch Rhyolitic Series [Obsolete Name and Code: Use RRH, PRR] (-3624) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
none recorded or not applicable | |||
Reference(s): | |||
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. | |||
Thomas, H H, and Cox, A H. 1924. The Volcanic Series of Trefgarn, Roch and Ambleston (Pembrokeshire). Quarterly Journal of the Geological Society, Vol.80, p.520-548. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E209 |