List of fossiliferous stratigraphic units in Northern Ireland
# List of fossiliferous stratigraphic units in Northern Ireland

| Group or Formation | Period |
| - | - |
| Bardahessiagh Formation | Ordovician |
| Blackstokes Limestone Formation | Carboniferous |
| Blackwater Limestone Formation | Carboniferous |
| Carrickaness Sandstone Formation | Carboniferous |
| Chalk Marl Formation | Cretaceous |
| Glauconitic Chalk Formation | Cretaceous |
| Glencar Formation | Carboniferous |
| Killey Bridge Formation | Ordovician |
| Lias Formation | Jurassic |
| Lias Group/Waterloo Mudstone Formation | Jurassic |
| Limehill Beds Formation | Silurian |
| Maydown Limestone Formation | Carboniferous |
| Pernarth Group/Westbury Formation | Triassic |
| Tirnaskea Formation | Ordovician |
| Waterloo Formation | Jurassic |
| White Limestone Formation | Cretaceous |
