The BGS Lexicon of Named Rock Units — Result Details
Drybrook Sandstone Group [Obsolete: use CHSA]
| Computer Code: | DS | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Index Level | ||
| Age range: | Arundian Substage (CJ) — Holkerian Substage (CQ) | ||
| Lithological Description: | [Obsolete: use CHSA] Sandstone with subordinate shale of Lower Drybrook Sandstone and finer grained sandstone with wind blown quartz of Upper Drybrook Sandstone divided by calcareous Drybrook Limestone. | ||
| Definition of Lower Boundary: | Drawn at base of Lower Drybrook Sandstone where it rests conformably on the Whitehead Limestone. (Correlative of Whitehead Limestone - Clifton Down Mudstone). (Correlative of Lower Drybrook Sandstone - Lower Cromhall Sandstone). | ||
| Definition of Upper Boundary: | Drawn at unconformable upward passage from Upper Drybrook Sandstone to quartzitic sandstones of the Quartzitic Sandstone Group or Trenchard Group of the Coal Measures. (Correlative of Upper Drybrook Sandstone - Middle Cromhall Sandstone. | ||
| Thickness: | About 230m | ||
| Geographical Limits: | Forest of Dean, Gloucestershire, West of River Severn. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Upper Drybrook Sandstone [Obsolete Name And Code: Part Of CHSA]
(UDS)
Drybrook Limestone (-874) Lower Drybrook Sandstone [Obsolete Name And Code: Part Of CHSA] (LDS) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | West of River Severn, Chepstow. | ||
| Reference(s): | |||
| Trotter, F M, 1942. Geology of the Forest of Dean and Iron-ore Field. Memoir of the Geological Survey of Great Britain. | |||
| Welch, F B A and Trotter, F M. 1961. Geology of the country around Monmouth and Chepstow. Explanation of one-inch geological sheets 233 and 250. Memoir of the Geological Survey of Great Britain. | |||
| Sibley, T F. 1912. The Carboniferous succession in the Forest of Dean Coalfield. Geological Magazine, Vol.49, p.417. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E234 E233 | |||