The BGS Lexicon of Named Rock Units — Result Details
Concretionary Limestone Member
| Computer Code: | CNCL | Preferred Map Code: | CNCL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Guadalupian Epoch (PUG) — Lopingian Epoch (PUL) | ||
| Lithological Description: | Lithologically varied dolostone with calcite concretions formed by a variety of primary and secondary sedimentary processes. Interpreted as the basin slope deposit of the Roker Formation (see Smith, 1994, fig.46 on page 94). | ||
| Definition of Lower Boundary: | Gradational, by interdigitation with the underlying Hartlepool Anhydrite Formation. | ||
| Definition of Upper Boundary: | Base of the overlying Forden Evaporite Formation, marked by the incoming of anhydrite and halite. | ||
| Thickness: | Up to a maximum of about 95 - 100m. | ||
| Geographical Limits: | Durham Province, onshore and offshore outcrops, of the English Zechstein Group: County Durham, Tyne and Wear, Cleveland and northernmost North Yorkshire. | ||
| Parent Unit: | Roker Formation (ROD) | ||
| Previous Name(s): | Concretionary Limestone Formation [Obsolete Name and Code: Use CNCL]
(-149)
Upper Magnesian Limestone (Durham) [Obsolete Name And Code: See SHE, CNCL, ROD] (UML) Upper Magnesian Limestone [Obsolete Name and Code: Use SEH, ROD, CNCL] (-2105) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Fulwell Hill quarries, Sunderland (Smith, 1994). | ||
| Type Area | Coastal cliffs from South Shields, via Sunderland, to a point 3 km north of Seaham Harbour (Smith, 1994). | ||
| Reference(s): | |||
| Smith, D B and Francis, E A. 1967. Geology of the country between Durham and West Hartlepool. Memoir of the Geological Survey of Great Britain, Sheet 27 (England and Wales). | |||
| Smith, D B. 1985. Zechstein reefs and associated facies. E1 to E23 in The Role of Evaporites in Hydrocarbon Exploration. Taylor, J C M (ed.), London: JAPEC Course Notes, No. 39. | |||
| Smith, D B, 1994. Geology of the country around Sunderland. Memoir of the British Geological Survey, Sheet 21, (England and Wales). | |||
| Smith, D B. 1971. The stratigraphy of the Upper Magnesian Limestone in Durham - a revision based on the Institute's Seaham Borehole. Report of the Institute of Geological Sciences, No.71/3. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E021 E027 | |||