The BGS Lexicon of Named Rock Units — Result Details
Dungiven Formation
Computer Code: | DUNN | Preferred Map Code: | DN |
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Status Code: | Full | ||
Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
Lithological Description: | Intercalated metalimestone, basic metavolcanics, graphitic and micaceous schist, quartzites and psammites. | ||
Definition of Lower Boundary: | Not exposed. | ||
Definition of Upper Boundary: | Base of major amphibolitic green beds (Glenga Amphibolite Member) at base of Dart Formation. | ||
Thickness: | Unknown | ||
Geographical Limits: | Sperrin Mountains, Co. Londonderry, Northern Ireland. | ||
Parent Unit: | Tayvallich Subgroup (DBTV) | ||
Previous Name(s): | Dungiven Limestone [Obsolete Name and Code: Use DBDU, DUNN]
(-4589)
Dungiven Formation (A) [Obsolete Code: Use DUNN] (DBDI) Dungiven Formation (B) [Obsolete Code: Use DUNN] (DBDU) Dungiven Formation [Obsolete Name and Code: Use DUNN] (-221) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Reference Section | Principal reference section: East side of Butterhope Glen. Graphitic limestone, quartzite, green bed sequence. | ||
Partial Type Section | [bottom of unit]: base of limestone that crops out on Balin Hill and Mary Grey Mountain. Area not yet mapped in detail | ||
Partial Type Section | [top of unit]: South end of Butteslope Glen: limestone unit succeeded by amphibolitic green bed (Glenga Amphibolite Member) at base of Dart Formation. | ||
Reference(s): | |||
Arthurs, J W. 1976. The geology and metalliferous mineral potential of the Sperrin Mountains area. Geological Survey of Northern Ireland, Special Report No. 1, 119pp, 2app, 2 figs, 7 tables, 102 maps. | |||
Hartley, J J, 1938. The Dalradian rocks of the Sperrin Mountains and adjacent areas in Northern Ireland. Proceedings of the Royal Irish Academy, Vol.XLIV, section B, 141-171. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
N26 |