The BGS Lexicon of Named Rock Units — Result Details

Tullyard Conglomerate Member

Computer Code: TUY Preferred Map Code: TUY
Status Code: Full
Age range: Chadian Substage (CI) — Chadian Substage (CI)
Lithological Description: Conglomerate, matrix-clast supported, calcareous, very coarse sand (grit) matrix. Clasts up to 6cm, unsorted, rounded/subrounded, exclusively of white, milky and clear vein quartz.
Definition of Lower Boundary: Within Bin Mountain Sandstone: Change from orange-weathering, fine-grained sandstones, below, to coarse conglomerate.
Definition of Upper Boundary: Within Bin Mountain Sandstone: Top of conglomerate marked by 0.04m of black coaly shale and orange-weathering medium- to coarse-grained decalcified pebbly sandstone.
Thickness: 0 - 5m
Geographical Limits: The Omagh area of the northwest Carboniferous basin of Ireland.
Parent Unit: Bin Mountain Sandstone Formation (BNMS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Southeast-flowing stream, west bank, in Tullyard Townland. Exposes full thickness of member and upper and lower contacts. 
Type Area  Southwest side of Killoan Lane in small streams and open, superficial deposit-free ground. Exposures of conglomerate and debris produced by its weathering. 
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