List of fossiliferous stratigraphic units in the Republic of Ireland
# List of fossiliferous stratigraphic units in the Republic of Ireland

| Group or Formation | Period |
| - | - |
| Ballyadams Formation | Carboniferous |
| Ballysteen Limestone Formation | Carboniferous |
| Boyne Group/Feltrim Formation | Carboniferous |
| Boyne Group/Slane Castle Formation | Carboniferous |
| Carboniferous Formation | Carboniferous |
| Clashford House Formation | Ordovician |
| Clogrenan Formation | Carboniferous |
| Cloonnamna Formation | Silurian |
| Courtown Formation | Ordovician |
| Dartry Limestone Formation | Carboniferous |
| Drom Point Formation | Silurian |
| Duncannon Formation | Ordovician |
| Duncannon Group/Campile Formation | Ordovician |
| Duncannon Group/Portrane Limestone Formation | Ordovician |
| Duncannon Group/Tramore Limestone Formation | Ordovician |
| Feltrim Formation | Carboniferous |
| Ferriters Cove Formation | Silurian |
| Fingal Group/Lucan Formation | Carboniferous |
| Fingal Group/Naul Formation | Carboniferous |
| Fingal Group/Tober Colleen Formation | Carboniferous |
| Glencar Limestone Formation | Carboniferous |
| Grange Allen Formation | Ordovician |
| Grangegeeth Group/Knockerk Formation | Ordovician |
| Harrylock Formation | Devonian |
| Hollyford Formation | Silurian |
| Holmpatrick Formation | Carboniferous |
| Hook head Formation | Carboniferous |
| Kilbride Formation | Silurian |
| Kilbride Limestone Formation | Carboniferous |
| Kilcoan Sands Formation | Cretaceous |
| Kildare Limestone Formation | Ordovician |
| Kilmore Sandstone Group/Coomhola Formation | Carboniferous, Devonian |
| Kiltorcan Formation | Devonian |
| Kiltorcan beds Formation | Devonian |
| Knockerk Formation | Ordovician |
| Lane Formation | Carboniferous |
| Limerick Limestone Formation | Carboniferous |
| Lough Shee Mudrocks Formation | Ordovician |
| Lower Bricklieve Limestone Formation | Carboniferous |
| Mullaghfin Formation | Carboniferous |
| Murrisk Group/Mweelrea Formation | Ordovician |
| Navan Group/Liscartan Formation | Carboniferous |
| Navan Group/Meath Formation | Carboniferous |
| Navan Group/Moathill Formation | Carboniferous |
| New Red Sandstone Group / Kingscourt Gypsum Formation | Permian |
| New Red Sandstone Group / Kingscourt Sandstone Formation | Triassic |
| Old Red Sandstone Group/Kiltorcan Formation | Devonian |
| Porter's Gate Formation | Carboniferous |
| Ribband Group/Booley Bay Formation | Cambrian |
| Tourmakeady Formation | Ordovician |
| Upper Bricklieve Limestone Formation | Carboniferous |
| Upper Shawly Beds Formation | Carboniferous |
| West Cork Sandstone Formation | Carboniferous |
