The BGS Lexicon of Named Rock Units — Result Details

Sherburn (Anhydrite) Formation

Computer Code: SNA Preferred Map Code: SnA
Status Code: Pending Upgrade
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 (-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