The BGS Lexicon of Named Rock Units — Result Details

Brotherton Formation

Computer Code: BTH Preferred Map Code: Bth
Status Code: Full
Age range: Guadalupian Epoch (PUG) — Lopingian Epoch (PUL)
Lithological Description: Limestone, dolomitic, grey with abundant Calcinema.
Definition of Lower Boundary: Upward transition from mudstones of underlying Edlington Formation.
Definition of Upper Boundary: Upward passage into Billingham Anhydrite, or, where that is absent, the Roxby Formation.
Thickness: 0-20m
Geographical Limits: Crops out from north Nottinghamshire to north Yorkshire. Pinches out south-west of a line from Worksop to Newark. Equivalent to Seaham Formation of Co. Durham.
Parent Unit: Zechstein Group (ZG)
Previous Name(s): Brotherton Beds (-3250)
Magnesian Limestone (Of Yorkshire), Upper (-2030)
Brotherton (Magnesian Limestone) Formation (-3879)
Upper Magnesium Limestone (-92)
Magnesian Limestone (Yorkshire), Upper [Obsolete Name And Code: Use BTH] (UMLY)
Alternative Name(s): Seaham Formation (County Durham)
Stratotypes:
Type Area  Numerous disused quarries around Brotherton, North Yorkshire (Smith et al, 1968). 
Reference(s):
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:
E062 E033 E070 E052 E078 E090 E082 E043 E126 E042 E087 E072 E081 E091 E115 E127