title: List of fossiliferous stratigraphic units in Northern Ireland
text: # 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 |
  