The BGS Lexicon of Named Rock Units — Result Details
Sherburn Anhydrite Formation
| Computer Code: | SNA | Preferred Map Code: | SnA |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Guadalupian Epoch (PUG) — Lopingian Epoch (PUL) | ||
| Lithological Description: | A formation within the Staintondale Group of the English Zechstein. The group is not formally defined. It comprises the deposits of the Zechstein evaporite cycle EZ4. | ||
| Definition of Lower Boundary: | Drawn at base of anhydrite of the Sherburn Formation where it rests on magnesite of the Upgang Formation or mudstones and siltstones of the Carnallitic Marl Formation. | ||
| Definition of Upper Boundary: | Drawn at upward passage from anhydrite to halite, with anhydrite laminae of the Sneaton Formation (at depth) or to mudstone of Roxby Formation (at outcrop). | ||
| Thickness: | Approximately 2-15 metres (thins eastwards). | ||
| Geographical Limits: | Eastern England (Yorkshire and Durham); provinces. | ||
| Parent Unit: | Zechstein Group (ZG) | ||
| Previous Name(s): | Sherburn Anhydrite Formation [Obsolete Code: See SNA]
(UPA)
Upper Anhydrite [Obsolete Name and Code: Use SNA] (-2437) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Sherburn Mine (No.2 shaft), Sherburn in Elmet, near Castleford, Yorkshire, England. | ||
| Reference(s): | |||
| Smith, D B, Brunstrom, R G W, Manning, D I, Simpson, S and Shotton, F W. 1974. A correlation of Permian rocks in the British Isles. Geological Society of London Special Report No. 5. | |||
| Smith, D B, Harwood, G M, Pattison, J and Pettigrew, T H. 1986. A revised nomenclature for Upper Permian strata in eastern England. 9-17 in Harwood, G M and Smith, D B (editors). The English Zechstein and Related Topics. Geological Society Special Publication No.22. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E081 E043 E090 E091 E027 | |||