The BGS Lexicon of Named Rock Units — Result Details
Tregaron Formation
| Computer Code: | TREGN | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Devensian Stage (QD) — Holocene Epoch (QH) | ||
| Lithological Description: | Peat with silt; the margins of the formation are more silt-rich. | ||
| Definition of Lower Boundary: | Defined by the base of bed 3 (Hibbert and Switsur, 1976) where peats replace Late Devensian muds and lacustrine clay. Corylus is first represented continuously in the profile, and a C14 date of 9750+/-220 (11 6000 cal) BP was obtained. Locally unconformably overlies Late Devensian head deposits (Godwin and Mitchell, 1938) and Plynlimon Glacigenic Formation. | ||
| Definition of Upper Boundary: | Ground surface, locally unconformably overlain by deposits of the Teifi Valley Formation. | ||
| Thickness: | 5 m. | ||
| Geographical Limits: | Tregaron Bog, Ceredigion (Wales). | ||
| Parent Unit: | Britannia Catchments Group (BCAT) | ||
| Previous Name(s): | Tregaron Formation
(TREGN)
Peat (PEAT) Tregaron Formation (TREGN) Peat (PEAT) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Cors Garon comprises three separate areas of raised peat bog, at the head of the Afon Teifi. Campbell and Bowen, 1989. | ||
| Reference(s): | |||
| Bowen, D Q. 1999. Wales. Chapter 7 in A revised correlation of Quaternary deposits in the British Isles. Bowen, D Q (editor). Geological Society of London Special Report, No. 23. | |||
| Campbell, S and Bowen, D Q. 1989. Quaternary of Wales. Geological Conservation Review. (Peterborough: Nature Conservancy Council.) | |||
| McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. | |||
| Godwin, H and Mitchell, G F. 1938. Stratigraphy and development of two raised bogs near Tregaron, Cardiganshire. New Phytologist, Vol.37, 425-454. | |||
| Hibbert, F A and Switsur, V R. 1976. Radiocarbon dating of Flandrian pollen zones in Wales and northern England. New Phytologist, Vol.77, 793-807. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||