The BGS Lexicon of Named Rock Units — Result Details

Barnby Member

Computer Code: BNBM Preferred Map Code: Bby
Status Code: Full
Age range: Hettangian Age (JH) — Hettangian Age (JH)
Lithological Description: Grey calcareous mudstones with rare thin argillaceous limestones comprising c.1% of the sequence.
Definition of Lower Boundary: Top of highest limestone bed in Barnstone Member.
Definition of Upper Boundary: Base of lowest (unnamed) limestone bed in Granby Member (see references for details of beds within members).
Thickness: 22.05 metres in borehole F/B5 (SK95SW/17).
Geographical Limits: East Midlands Shelf area: South Yorkshire to north flank of London Platform.
Parent Unit: Scunthorpe Mudstone Formation (SMD)
Previous Name(s): Angulatum Clays [Obsolete Name And Code: Use BNBM] (ANGC)
Angulata Clays (-2626)
Barnby Clays (-1367)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Fulbeck Airfield Borehole F/B5 (SK95SW/17), depths 87.35 metres to 109.40 metres. 
Reference Section  Fulbeck Airfield Borehole F/B1 (SK85SE/25), depths 70.9 metres to 92.8 metres. 
Reference(s):
Brandon, A, Sumbler, M G and Ivimey-Cook, H C, 1990. A revised lithostratigraphy for the Lower and Middle Lias (Lower Jurassic) east of Nottingham, England. Proceedings of the Yorkshire Geological Society, Vol.48, 121-141. 
Sumbler, M G, 1987. Geological Notes and Local Details for 1:10,000 Sheet SK85SE (Beckingham). British Geological Survey Technical Report. 
Sumbler, M G, 1987. Geological Notes and Local Details for 1:10,000 Sheet SK95SW (Brant Broughton). British Geological Survey Technical Report. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E127 E142