The BGS Lexicon of Named Rock Units — Result Details
Dryden Flags Formation
| Computer Code: | DRY | Preferred Map Code: | DRY |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Pragian Age (DP) — Pragian Age (DP) | ||
| Lithological Description: | Brownish green shales and siltstones with a few sandstone bands; contains interbedded chert and rhyolitic to andesitic lava and ash at NJ 494 277, near Windyfield. | ||
| Definition of Lower Boundary: | Change from dominantly arenaceous to dominantly argillaceous lithologies. | ||
| Definition of Upper Boundary: | Removed by erosion. | ||
| Thickness: | Approx. 260 metres in type section, but not seen; probably approx. 800 metres present in Castlehill (NJ 515 283) area. | ||
| Geographical Limits: | Rhynie Outlier, Grampian Highlands, Scotland. | ||
| Parent Unit: | Rhynie Group (RHN) | ||
| Previous Name(s): | Dryden Shales [Obsolete Name And Code: Use DRY]
(DRYS)
Dryden Flags [Obsolete Name and Code: Use DRY] (-2768) Dryden Formation (-873) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Dry Den, Sheet 76W, Scotland. | ||
| Reference(s): | |||
| Wilson, J S G. 1890. Explanation of Sheet 76 Central Aberdeenshire. Memoir of the Geological Survey (Scotland). | |||
| Stephenson, D and Gould, D. 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey.) | |||
| 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.) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S076 S086 | |||