The BGS Lexicon of Named Rock Units — Result Details
Lligwy Sandstone Formation
| Computer Code: | LGY | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Holkerian Substage (CQ) — Asbian Substage (CR) | ||
| Lithological Description: | Cross-bedded sandstones, pebbly sandstones and conglomerates with subordinate siltstone and mudstone beds. Records fluvial deposition along the margin of the North Wales Dinantian platform throughout the late Asbian. | ||
| Definition of Lower Boundary: | Rests unconformably on ?Devonian, Ordovician and Precambrian rocks (Mona Complex). | ||
| Definition of Upper Boundary: | Overlain and passes laterally into thick-bedded limestones of the Loggerheads Limestone Formation. | ||
| Thickness: | To 60m | ||
| Geographical Limits: | Between Llangefni [SH4675] and Lligwy Bay, [SH5087], Anglesey, North Wales. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Basement Beds Formation [Obsolete Name And Code: See Supplementary Information]
(BED)
Basement Conglomerate (Anglesey) [Obsolete Name And Code: Use LGY] (BCA) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Northwest facing slopes, east of Afon Lligwy, Anglesey. Crags and small quarries provide intermittent exposures in the upper part of the Formation. Greenly, 1919. | ||
| Reference(s): | |||
| Greenly, E. 1919. Geology of Anglesey. Memoir of the Geological Survey, UK. | |||
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. | |||
| Davies, J R. 1983. The stratigraphy, sedimentology and palaeontology of the Lower Carboniferous of Anglesey. Unpublished PhD thesis, University of Keele. | |||
| Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E094 | |||