| 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
|
| Stratotypes: |
| 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. |
| Reference(s): |
| 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 |
