The BGS Lexicon of Named Rock Units — Result Details

Leete Limestone Formation

Computer Code: LEEL Preferred Map Code: notEntered
Status Code: Full
Age range: Holkerian Substage (CQ) — Asbian Substage (CR)
Lithological Description: Lithologically varied comprising diagnostic porcellanous and fenestral limestones (wackestones and calcite mudstones) interbedded with dark, foetid argillaceous limestone (packstones), and pale skeletal peloidal limestones (packstones and grainstones) including beds rich in oncoids. Thin grey and green mudstone beds and rare coals are present locally. Lithologies are arranged in shoaling-upwards rhythms, each capped by a porcellanous limestone.
Definition of Lower Boundary: Lowermost porcellanous limestone overlying coarser-grained and thicker-bedded limestones of the Llanarmon Limestone Formation.
Definition of Upper Boundary: Uppermost porcellanous limestone underlying rubbly and pseudobrecciated limestone of the Loggerheads Limestone Formation.
Thickness: 150 to 175m
Geographical Limits: Crops out on Anglesey [SH5982] in northwest Wales; at Llandulas [SH9078] and along the western side of the Vale of Clwyd [SJ1252]; along the eastern side of the Vale of Clwyd in fault slices along the Vale of Clwyd Fault [SJ1267]; in its type area east of the Clwydian Range between Nannerch and Llanelidan [SJ1852]; and south of the Bala Fault Zone between Minera and Oswestry [SJ2722].
Parent Unit: Clwyd Limestone Group (CLWYD)
Previous Name(s): Dulas Limestone Formation [Obsolete Name And Code: Use LEEL] (DLSL)
Lower Brown Limestone [Obsolete Name And Code: See FOF, LEEL, LNML, TNL] (LBRL)
Leete Limestone Formation (Obsolete Code: Use LEEL) (-1649)
Sychtyn Member (-1021)
Leete Limestone Formation [Obsolete Code: Use LEEL] (LEET)
Dulas Limestone (*669)
Ty-Nant Limestone Formation (TNL)
Tandinas Limestone Formation [Obsolete Name And Code: Use LEEL] (TDL)
Careg-Onen Limestone Formation [Obsolete Name And Code: Use LEEL] (COLF)
Alternative Name(s): Dulas Limestone
Ty-Nant Limestone
Tandinas Limestone
Stratotypes:
Partial Type Section  Scarp east of River Alyn in Leete Country Park at Loggerheads, provides a section through the upper 65m of the Formation. Davies ety al., in press. 
Reference(s):
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. 
Somerville, I D, 1979. Minor sedimentary cyclicity in Late Asbian (Upper D1) Limestones in the Llangollen district of North Wales. Proceedings of the Yorkshire Geological Society, Vol.42, p.317-341. 
Davies, J R, Wilson, D and Williamson, I T. 2004. Geology of the country around Flint. Memoir for 1:50 000 Geological Sheet 108. 
Davies, J R, Riley, N J and Wilson, D, 1989. Distribution of Chadian and earliest Arundian strata in North Wales. Geological Journal, Vol 24/1, 31-47. 
Warren, P T, Price, D, Nutt, M J C and Smith, E G. 1984. Geology of the country around Rhyl and Denbigh. Memoir for 1:50 000 geological sheets 95 and 107 and parts of sheets 94 and 106. 
Grey, D I, 1981. Lower Carboniferous shelf carbonate palaeoenvironments in North Wales. Unpublished PhD thesis, University of Newcastle-upon Tyne. 
Somerville, I D, 1979. Cyclotherms in the early Brigantian (lower D2) limestones east of the Clwydian Range, North Wales. Geological Journal, Vol.14, 69-87. 
Somerville, I D and Strank, A R E, 1984. Discovery of Arundian and Holkerian faunas from a Dinantian platform succession in North Wales. Geological Journal, Vol.19, 85-104. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E108 E094 E095 E107 E121 E137