The BGS Lexicon of Named Rock Units — Result Details
Penmaen Dewi Shale Formation
| Computer Code: | PED | Preferred Map Code: | PeD |
|---|---|---|---|
| Status Code: | Pending Upgrade | ||
| Age range: | Arenig Series (OR) — Arenig Series (OR) | ||
| Lithological Description: | Dark blue cleaved mudstones. | ||
| Definition of Lower Boundary: | Not defined. | ||
| Definition of Upper Boundary: | Not defined. | ||
| Thickness: | c.300 metres. | ||
| Geographical Limits: | 1:50,000 Sheet 209 (St.Davids) and adjacent areas. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Road Uchaf Formation [Obsolete Name and Code: Use PED]
(-2360)
Tetragraptus Shales [Obsolete Name and Code: Use PED] (-3608) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| none recorded or not applicable | |||
| Reference(s): | |||
| Kokelaar, B P, Bevins, R E and Roach, R A. 1985. Submarine silicic volcanism and associated sedimentary and tectonic processes, Ramsey Island, south west Wales. Journal of the Geological Society of London, Vol.142 (4-6), 591-617. | |||
| Hicks, H. 1874. On the Succession of the Ancient Rocks in the vicinity of St. Davids Pembrokeshire, with special reference to those of the Arenig and Llandeilo Groups and their fossil contents. Quarterly Journal of the Geological Society, Vol.31, p.167-195. | |||
| Hughes, C P. 1982. "In" Bassett, M G. (Editor). Geological Excursions in Dyfed, South West Wales. Published for the Geologists' Association, South Wales Group by the National Museum of Wales, p.327. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E209 E210 | |||