The BGS Lexicon of Named Rock Units — Result Details

Tregaron Formation

Computer Code: TREGN Preferred Map Code: notEntered
Status Code: Full
Age range: Holocene Epoch (QH) — Holocene Epoch (QH)
Lithological Description: Peat; 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 Till Formation.
Definition of Upper Boundary: Ground surface, locally unconformably overlain by deposits of the Teifi Valley Formation.
Thickness: 5m
Geographical Limits: Tregaron Bog, Ceredigion (Wales).
Parent Unit: West Wales Catchments Subgroup (WWACA)
Previous Name(s): Tregaron Formation (TREGN)
Peat (PEAT)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Cors Garon comprises three searate areas of raised peat bog, at the head of the Afon Teifi. Campbell and Bowen, 1989. 
Reference(s):
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. 
Bowen, D Q, 1999. Wales. Chapter 7 in Bowen, D Q (Editor), A revised correlation of Quaternary deposits in the British Isles. 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.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable