The BGS Lexicon of Named Rock Units — Result Details
Roch Rhyolitic Group [Obsolete: use RRH]
| Computer Code: | PRR | Preferred Map Code: | RRh |
|---|---|---|---|
| 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) |
||
| 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 | |||