It has been described from a locality lying about 3 km NNE of Pomeroy, south of Craigbardahessiagh.
Field evidence indicates that the local top of the formation is characterised by a thrust contact with the Killey Bridge and Tirnaskea Formation (upper Katian and Hirnantian, respectively), exposed south of the Well Field, which lies 650 metres SSW of Craigbardahessiagh.
[2] The Bardahessiagh Formation preserves a diverse and well-preserved assemblage of fossils.
Based on the brachiopod faunas, the Bardahessiagh Formation has been interpreted as deposited in a transgressive regime, below storm-wave base environments, peaking in the second unit, with the presence of typical Sericoidea association (Candela 2001, 2006).
The integrity of the formation is currently endangered by excavation by locals using trenchers to dig irrigation ditches.