The BGS Lexicon of Named Rock Units — Result Details
Birk Riggs Formation
| Computer Code: | BKR | Preferred Map Code: | BKR |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Homerian Age (SH) — Homerian Age (SH) | ||
| Lithological Description: | Sandstone, siltstone and mudstone turbidite with interbedded laminated hemipelagite. | ||
| Definition of Lower Boundary: | Conformably overlies the Brathay Formation. | ||
| Definition of Upper Boundary: | Conformably overlain by the Coldwell Formation. | ||
| Thickness: | Variable; c.75-380m. | ||
| Geographical Limits: | Southern Lake District and north-west Pennines. | ||
| Parent Unit: | Tranearth Group (TNTH) | ||
| Previous Name(s): | Gawthwaite Sandstone Member [Obsolete Name and Code: Use BKR]
(-1987)
Lower Coldwell Beds [Obsolete Name And Code: See BKR] (LCW) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Birk Riggs. | ||
| Reference(s): | |||
| Moseley F. 1984. Lower Palaeozoic lithostratigraphical classification in the English Lake District. Geological Journal, Vol. 19, p. 239-247. | |||
| Millward, D, and Stone, P. 2012. Stratigraphical framework for the Ordovician and Silurian sedimentary strata of northern England and the Isle of Man. British Geological Survey Research Report, RR/12/04. 119pp. | |||
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) | |||
| Kneller, B C. 1990. The Wenlock rocks of sheet 38 (Ambleside). British Geological Survey Technical Report, WA/90/64 | |||
| Marr J E. 1892. On the Wenlock and Ludlow strata of the Lake District. Geological Magazine, Vol. 9, p 534-541. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E038 E048 E039 | |||