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): | Eryri Formation [Obsolete Name and Code: Use LNTI, WALES]
(-2914)
Llangelynin Member [Obsolete Name and Code: Use LNTI] (-1038) |
||
| 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): | |||
| Woodland, A W (editor). 1971. The Llanbedr (Mochras Farm) Borehole. Report of Institute of Geological Sciences, No. 71/18 | |||
| 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.) 112 pp. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||