The BGS Lexicon of Named Rock Units — Result Details
Bridges Formation
| Computer Code: | BRGP | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Ediacaran Period (AD) — Ediacaran Period (AD) | ||
| Lithological Description: | Mainly purple siltstones and sandstones, commonly laminated and moderately flaggy. Well-marked bedding and higher proportion of silt than in the underlying Bayston - Oakwood Formation. | ||
| Definition of Lower Boundary: | At the base of the Bridges Formation flaggy siltstones rest conformably upon massive sandstones of the Bayston-Oakswood Formation. | ||
| Definition of Upper Boundary: | Drawn where flaggy siltstone of the Bridges Formation is unconformably overlain by brown sandstones and conglomerates of the Hoar Edge Grit (Caradoc). | ||
| Thickness: | Averages c.900 m. | ||
| Geographical Limits: | Church Stretton and Linley areas, Shropshire. | ||
| Parent Unit: | Wentnor Group (YW) | ||
| Previous Name(s): | Bridges Group [Obsolete Name and Code: Use BRGP]
(-4493)
Bridges Formation [Obsolete Code: Use BRGP] (YWB) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | The bridges near Ratlinghope, Shropshire. | ||
| Reference(s): | |||
| Whitehead, T H, Wedd, C B, Pocock, R W and Robertson, T with contributions by Wray, D A, Stubblefield, C J, Cantrill, T C and Davies, W M, 1938. Shrewsbury district. Memoir of the Geological Survey. | |||
| Greig D C, Wright, J E, Hains, B A and Mitchell, G H. 1968. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Memoir of the Geological Survey, Sheet 166 (England and Wales). (London: H.M.S.O.). 379pp. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||