The BGS Lexicon of Named Rock Units — Result Details

Grey Beds

Computer Code: GRY Preferred Map Code: Gry
Status Code: Index Level
Age range: Guadalupian Epoch (PUG) — Lopingian Epoch (PUL)
Lithological Description: Grey mudstones and siltstone, containing fragmentary plant remains together with thin impersistent limestone beds, seen as a muddy sandstone in the south.
Definition of Lower Boundary: Taken at the base of a sequence of grey mudstones overlying breccia, elsewhere resting on reddened Carboniferous rocks.
Definition of Upper Boundary: Defined by the base of the 'Magnesian Limestone' where present, or by the basal rocks of the St Bees Shale Formation.
Thickness: From 10 m to 20 m thick.
Geographical Limits: Barrow-in-Furness.
Parent Unit: St Bees Evaporite Formation (SBE)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Haverigg Haws borehole, SD17NW/2. Rose and Dunham, 1977. 
Reference(s):
Rose, W C C. 1977. Geology and Hematite deposits of South Cumbria. Economic Memoir for 1:50,000 Sheet 58 and southern part of Sheet 48. Memoir of the geological Survey of Great Britain. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E058