The BGS Lexicon of Named Rock Units — Result Details

Drumowen Sandstone Member

Computer Code: DRMS Preferred Map Code: DRMS
Status Code: Full
Age range: Arundian Substage (CJ) — Arundian Substage (CJ)
Lithological Description: Sandstone, fawn to pale brown and pale grey, iron-stained, micaceous, calcareous, unfossiliferous, parallel laminations, ripple cross-bedding, bioturbated, fine- to medium-grained, quartz arenite to subarkose.
Definition of Lower Boundary: Below base of main sandstone are blue-grey bioclastic packstones with low sand content which increases in basal few centimetres, conformable on normal Ballyshannon Limestone Formation.
Definition of Upper Boundary: Directly underlies micritised limestones of Ederny Limestone Member; conformable.
Thickness: c.2.7m
Geographical Limits: Restricted to northeast corner of the Kesh-Omagh area of the northwest Carboniferous basin of Ireland.
Parent Unit: Ballyshannon Limestone Formation (BAL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Forms waterfall at (20m west of) Carrickness Bridge on the Black Water River; full thickness of member. 
Mitchell, W I, Johnston, T P and Legg, I C. 2004. Geology of the country around Kesh, Co. Fermanagh and Omagh, Co. Tyrone. Geological Sheets 32 and part of 31 (Kesh) and 33 (Omagh). Geological Survey of Northern Ireland. Technical Report GSNI 04/1. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable