The BGS Lexicon of Named Rock Units — Result Details

Llangelynin Till Member

Computer Code: LNTI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Till with clasts of Mesozoic rocks from offshore and red clay from the Oligocene Bed of Tremadoc Bay, together with erratics from Cadair Idris and Aran Fawddwy
Definition of Lower Boundary: Overlies head (of the Pennard Formation, Bowen, 1999) and redeposited till (Bowen, 1974).
Definition of Upper Boundary: Ground surface or overlain by glacigenic deposits of the Eryri Glacigenic Formation (Wales Glacigenic Subgroup)
Thickness: none recorded or not applicable
Geographical Limits: Coastal lowlands north of Aberystwyth between Llwyngwril and Tonfannau.
Parent Unit: St Asaph Glacigenic Formation (SAGL)
Previous Name(s): Llangelynin Member (-1038)
Eryri Formation (-2914)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Mochras Farm Borehole (BGS Registered No. SH52NE1) Lower of two tills proved in the borehole (see Woodland, 1971; Allen and Jackson, 1985 for sediment description) 
Type Area  Coast between Llwyngwril annd Tonfannau, Barmouth Bay Bowen, 1999 
Reference(s):
Etienne, J L , Hambrey, M J , Glasser, N F and Jansson, K N. 2005. West Wales. In Lewis, C A and Richards A E. (eds) The glaciations of Wales and adjacent areas. Logaston Press 
Allen, P M and Jackson, A A. 1985. Geology of the country around Harlech. Memoir of the British Geological Survey, Sheet 135 with part of Sheet 149 [England and Wales]. [London: HMSO.] 112pp. 
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. 
Woodland, A W (editor). 1971. The Llanbedr (Mochras Farm) Borehole. Report of Institute of Geological Sciences, No. 71/18 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable