The BGS Lexicon of Named Rock Units — Result Details
Barnstone Member
| Computer Code: | BNT | Preferred Map Code: | Bst |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Rhaetian Age (TR) — Hettangian Age (JH) | ||
| Lithological Description: | Alternating grey mudstones and limestones; limestones generally 0.1 metres to 0.3 metres thick, argillaceous calcilutites forming c.30% of sequence; shell debris in limestones in basal 2 - 3 metres. | ||
| Definition of Lower Boundary: | Base of Lias Group: basal mudstone with sharp contact on Cotham Member of Penarth Group. | ||
| Definition of Upper Boundary: | At top of highest limestone bed in Member. | ||
| Thickness: | 8.1m to 8.7m in stratotypes, 9.6m at Barnstone; ranging from c.5m - 10m over area of occurence. | ||
| Geographical Limits: | East Midlands Shelf area: between Market Weighton area to north, and north flank of London Platform to south. | ||
| Parent Unit: | Scunthorpe Mudstone Formation (SMD) | ||
| Previous Name(s): | Hydraulic Limestone Series
(-712)
Strensham Series (-713) Hydraulic Limestones [Obsolete Name And Code: See SMD, BNT, ELL] (HYDL) Limestone Series [Obsolete Name and Code: Use BNT] (-3233) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Fulbeck Airfield Borehole F/B1 (SK85SE/25), depths from 92.8m to 100.9m. | ||
| Type Section | Fulbeck Airfield Borehole F/B5 (SK95SW/17), depths 109.40m to 117.65m. | ||
| Partial Type Section | Large flooded quarry 0.75 km south-west of Barnstone. | ||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E127 E142 E141 | |||