The BGS Lexicon of Named Rock Units — Result Details

Dungiven Formation

Computer Code: DUNN Preferred Map Code: DN
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 (-4589)
Dungiven Formation (A) [Obsolete Code: Use DUNN] (DBDI)
Dungiven Formation (B) [Obsolete Code: Use DUNN] (DBDU)
Dungiven Formation [Obsolete Code: Use DUNN] (-221)
Alternative Name(s): none recorded or not applicable
Stratotypes:
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 Section  Principal reference section: East side of Butterhope Glen. Graphitic limestone, quartzite, green bed sequence. 
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