The BGS Lexicon of Named Rock Units — Result Details

Drumcullen Formation

Computer Code: DREN Preferred Map Code: DREN
Status Code: Full
Age range: Early Triassic Epoch (TE) — Early Triassic Epoch (TE)
Lithological Description: Sandstone, orange-red, very fine-to medium-grained, poorly sorted, weakly calcareous dolomitic cement, mudstone up to 25%, deep orange-brown.
Definition of Lower Boundary: Gradational decrease in proportion of red mudstone from underlying White Brae Mudstone Formation [formerly Permian Upper Marls].
Definition of Upper Boundary: Gradational, with loss of red mudstones in succeeding Toomebridge Sandstone Formation.
Thickness: 160-177m [525-580 ft].
Geographical Limits: Sub-surface on northwest shore of Lough Neagh and in Ballymacilroy Borehole No.1 [J0574 9761].
Parent Unit: Sherwood Sandstone Group (SSG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Reference Section  Annaghmore-1 Borehole. GSNI Borehole Database Number 94SE/1 [2260-2830ft--688.8-862-6m] Based on cutting samples at 10ft intervals at which a split sample is stored with the Geological Survey of Northern Ireland. 
Naylor, D, Philcox, M E and Clayton, G. 2003. Annaghmore-1 and Ballynamullan-1 wells, Larne-Lough Neagh Basin, Northern Ireland. Irish Journal of Earth Sciences, Vol.21, 47-69. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable