The BGS Lexicon of Named Rock Units — Result Details
Buildwas Formation
| Computer Code: | BUI | Preferred Map Code: | Bw |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Sheinwoodian Age (SS) — Sheinwoodian Age (SS) | ||
| Lithological Description: | Olive-green and grey calcareous mudstone and nodular to lenticular calcareous mudstone and argillaceous limestone; shell fragments present throughout. | ||
| Definition of Lower Boundary: | Base of the first grey-green, rubbly mudstones containing comminuted shell debris above mottled green, grey and purple mudstones of Rubery Formation. 1m thick transition in colour and upward decrease in number of hard siltstone beds. | ||
| Definition of Upper Boundary: | Gradational increase in thickness and number of limestone beds into overlying Barr Limestone Formation. | ||
| Thickness: | 22-40m. Walsall 22m; Wenlock Edge 25.5-40m | ||
| Geographical Limits: | West Midlands, Welsh Borders. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Wenlock Shale [Obsolete Name and Code: Use CBRD, BUI]
(-3254)
Buildwas Beds (-734) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | [Bassett 1989, p.56]. Left (north) bank of Hughley Brook, 200m SE of Leasows Farm, 500m NE of Hughley Church. | ||
| Reference Section | [Butler, 1937] Walsall Co-operative Society Borehole (SP09NW/33) 795'6" to 870'. | ||
| Reference(s): | |||
| Bassett, M G. 1989. The Wenlock Series in the Wenlock area. 51-73 in A global standard for the Silurian System. Holland, C H, and Bassett, M G (editors). National Museum of Wales, Gelogical series No. 9, Cardiff. | |||
| Butler, A J. 1937. On Silurian and Cambrian rocks encountered in a deep boring at Walsall, South Staffordshire. Geological Magazine, Vol. 74, 241-257. | |||
| Bassett, M G. 1974. Review of the stratigraphy of the Wenlock Series of the Welsh Borderlands and South Wales. Palaeontology, 17, 745-777. | |||
| Cocks, L R M, Holland, C H, Rickards, R B and Strachan, I, 1971. A correlation of Silurian rocks in the British Isles. Geological Society of London, Special Report No.1. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E154 | |||