The BGS Lexicon of Named Rock Units — Result Details
Dryden Flags Formation
Computer Code: | DRY | Preferred Map Code: | DRY |
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Status Code: | Pending Upgrade | ||
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: | Not defined. | ||
Parent Unit: | Rhynie Group (RHN) | ||
Previous Name(s): | Dryden Flags [Obsolete Name and Code: Use DRY]
(-2768)
Dryden Formation (-873) Dryden Shales [Obsolete Name And Code: Use DRY] (DRYS) |
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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). | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S076 S086 |