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Heritage: Geological Sites
County Geological Sites in Mayo
| Feature Name | IGH Theme - Secondary | IGH Theme – Primary |
| Clew Bay | Quaternary | |
| Inishkea Islands | Precambrian Geology | |
| Pontoon Woods | Precambrian Geology | |
| Annagh Head Scotchport | Precambrian Geology | |
| Finny Bridle Path | Precam-Dev Palaeontology | |
| Lough Mask Shoreline | Camb-Sil Stratigraphy | |
| Cong Area | Karst | |
| Mweelrea | Camb-Sil Stratigraphy | Carboniferous |
| Aile River cave | Karst | |
| Belderg Harbour | Precambrian Geology | |
| Burren | Precam-Dev Palaeontology | |
| Cappagh | Quaternary Precambrian Geology | |
| Creevagh Head | Carboniferous | |
| Croaghmoyle | Devonian | Carboniferous |
| Downpatrick Head | Carboniferous | Coastal Geomorphology |
| Finny School | Precam-Dev Palaeontology | |
| Glenisland River | Devonian | |
| Kilcummin Head | Carb-Pilo Palaeontology | Quaternary |
| Kings Hill | Devonian | Carboniferous |
| Port-Glenloss Point | Precambrian | Quaternary |
| Ross Strand | Igneous Intrusions | |
| Shangort | Camb-Silo Stratigraghy | Igneous Intrusions |
| Stella Maris | Carboniferous | |
| Ballynew Outcrop | Carboniferous | |
| Benwee Head | Precambrian Geology | |
| Derrycraff | Carboniferous | |
| Killala Esker | Quaternary | |
| Lough Akeel | Carboniferous | |
| Ringarraun | Carboniferous Upper | |
| Rockfleet Bay | Carboniferous | |
| Tawnagh More | Precambrian Geology | Carboniferous |
| Bollinglanna, Nth Clew Bay | Carb-Pilo Palaeontology | |
| Townplots, Killala | Carb-Pilo Palaeontology |