Click headings [A-Z] to sort any column. Selecting any Subject block, County name or Period in the list refines the list to that topic or place. Currently sorted
by Site name.
| Site name [A-Z] | Subject block [A-Z] | County [A-Z] | Period [A-Z] |
|---|
| Aghatirourke Townland caves, east Cuilcagh | CARBONIFEROUS | Fermanagh | Carboniferous |
| Aghnadarragh | PLEISTOCENE | Antrim | Quaternary |
| Altagoan River | CARBONIFEROUS | Londonderry | Carboniferous |
| Altakeeran Burn, Glenshane Pass Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Altinure Burn, near Park | MINERALOGY AND METALLOGENESIS | Londonderry | Precambrian |
| Altmore Burn | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Ameracam Lane, Carlingford Lough - Carboniferous | CARBONIFEROUS | Down | Carboniferous |
| Annacramph Lane | CARBONIFEROUS | Armagh | Carboniferous |
| Annalong Valley | PLEISTOCENE | Down | Quaternary |
| Ardglass | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Armoy | PLEISTOCENE | Antrim | Quaternary |
| Ashfield Mountain Bar stream, Slieve Beagh | CARBONIFEROUS | Tyrone | Carboniferous |
| Attical Complex - Attical Valley Moraines | PLEISTOCENE | Down | Quaternary |
| Attical Complex - Attical Valley Outwash | PLEISTOCENE | Down | Quaternary |
| Attical Complex, Mourne Mountains - Overview | PLEISTOCENE | Down | Quaternary |
| Aughnagon Quarry | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Aughnagurgan, near Darkley | MINERALOGY AND METALLOGENESIS | Armagh | |
| Balix Hill | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Ballagh Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Ballinamallard Esker - site of local interest | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Ballinderry - deglacial landscape | PLEISTOCENE | Tyrone | Quaternary |
| Ballinderry - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Ballintoy-Ballycastle | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary, Tertiary, Cretaceous |
| Ballyberidagh North Townland lane - Ballycastle Coalfield | CARBONIFEROUS | Antrim | Carboniferous |
| Ballycastle Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Ballycastle Beach | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary |
| Ballycastle Coalfield | CARBONIFEROUS | Antrim | Carboniferous |
| Ballycastle Pellet Chalk | PALAEONTOLOGICAL REVIEW | Antrim | Cretaceous |
| Ballygawley Delta Complex - Fallaghearn Deltas | PLEISTOCENE | Tyrone | Quaternary |
| Ballygawley Delta Complex - Lurganboy Delta and Outwash | PLEISTOCENE | Tyrone | Quaternary |
| Ballygawley Delta Complex - Overview | PLEISTOCENE | Tyrone | Quaternary |
| Ballygawley Delta Complex - Tiroony Ridges | PLEISTOCENE | Tyrone | Quaternary |
| Ballyhalbert Pier | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Ballyharry - site of local interest | LOWER PALAEOZOIC | Down | Silurian, Ordovician |
| Ballykelly - deglacial landscape | PLEISTOCENE | Londonderry | Quaternary |
| Ballykelly, Sistrakeel and Fruitfield deglacial series | PLEISTOCENE | Londonderry | Quaternary |
| Ballymacombs More | PEAT AND RELATED STRATIGRAPHY | Londonderry | Quaternary |
| Ballymagreehan Quarry | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Ballymiscaw - site of local interest | LOWER PALAEOZOIC | Down | Ordovician |
| Ballynahone River | CARBONIFEROUS | Armagh | Carboniferous |
| Ballypalady Plant Bed | PALAEONTOLOGICAL REVIEW | Antrim | Tertiary |
| Ballyquintin Point | COASTAL PROCESSES AND SEALEVEL HISTORY | Down | Quaternary |
| Ballyrainey | PERMIAN | Down | Permian |
| Ballysudden, Cookstown | CARBONIFEROUS | Tyrone | Carboniferous |
| Banagher Glen Quarry | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Bannagh River | CARBONIFEROUS | Fermanagh | Carboniferous |
| Barnagh Bay, Copeland Island - site of local interest | LOWER PALAEOZOIC | Down | Ordovician |
| Barnes Burn - Dalradian | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Barnes Gap - Dalradian | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Barony Glen | CARBONIFEROUS | Londonderry | Carboniferous |
| Beaghbeg | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| Bellanaleck Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Bellevue Quarry - site of local interest | CLAY-WITH-FLINTS | Antrim | Tertiary |
| Bellevue, Belfast, Co Antrim Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Belmore, Ballintempo & Tullybrack Uplands; Belmore | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore, Ballintempo & Tullybrack Uplands; Boho | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore, Ballintempo & Tullybrack Uplands; Knockmore - Pollaraftra | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore, Ballintempo & Tullybrack Uplands; Noon's Hole-Arch Cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore, Ballintempo & Tullybrack Uplands; Reyfad-Carrickbeg | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore; Holywell Rising | KARST AND CAVES | Fermanagh | Quaternary |
| Belmore; Moneyouragan Cave | KARST AND CAVES | Fermanagh | Quaternary |
| Belmore; Moneyouragan Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Belmore; Moneyouragan Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore; Mullyard Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore; Rahallen Sink 1 | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belmore; Rahallen Sink 2 | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Belshaws Quarry Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Benburb | PLEISTOCENE | Tyrone | Quaternary |
| Benvan - Dalradian | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Benvan - Structural | STRUCTURAL GEOLOGY | Antrim | Precambrian |
| Binevenagh | PALAEOGENE | Londonderry | Tertiary |
| Binnawooda Spring | CARBONIFEROUS | Tyrone | Carboniferous |
| Black Head, Island Magee | PALAEOGENE | Antrim | Tertiary |
| Black Mountain Quarry, Belfast | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Black Rock | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| Blackslee Dyke | PALAEOGENE | Fermanagh | Tertiary, Carboniferous |
| Blaney Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Bloody Bridge River Fan | PLEISTOCENE | Down | Quaternary |
| Bloody Bridge River Outwash | PLEISTOCENE | Down | Quaternary |
| Bloody Bridge River Valley Complex, Mourne Mountains - Overview | PLEISTOCENE | Down | Quaternary |
| Bloody Bridge River Valley Ridges | PLEISTOCENE | Down | Quaternary |
| Boghill Quarry, Hightown | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Boho; Aghanaglack Cave | KARST AND CAVES | Fermanagh | Quaternary |
| Boho; Aghanaglack Rising | KARST AND CAVES | Fermanagh | Quaternary |
| Boho; Boho Caves Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Boho; Pollbeg | KARST AND CAVES | Fermanagh | Quaternary |
| Boho; Pollkerran | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Boho; Pollnagollum Coolarkan | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Bonnety Bush, Altihaskey | IGNEOUS - CALEDONIAN | Londonderry | Ordovician |
| Bovevagh Old Church | PLEISTOCENE | Londonderry | Quaternary |
| Broad Water - site of local interest | PLEISTOCENE | Down | Quaternary |
| Brown's Bay, Island Magee | CRETACEOUS | Antrim | Tertiary, Cretaceous, Triassic |
| Burntollet and Tamnymore Wood | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Butterlope Glen - Dalradian | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Butterlope Glen - Structural | STRUCTURAL GEOLOGY | Tyrone | Precambrian |
| Cam Lough Quarry - Caledonide Igneous Complex | IGNEOUS - CALEDONIAN | Armagh | Tertiary, Devonian, Silurian |
| Camlough Quarry - Structural | STRUCTURAL GEOLOGY | Down | Tertiary, Devonian, Silurian |
| Capecastle Quarry | CRETACEOUS | Antrim | Cretaceous |
| Cappagh Quarry | DEVONIAN | Tyrone | Devonian |
| Carboniferous Biostratigraphy - Overview | CARBONIFEROUS | Antrim, Armagh, Down, Fermanagh, Londonderry, Tyro | Carboniferous |
| Carboniferous Palaeogeography of N. Ireland | CARBONIFEROUS | Antrim, Armagh, Down, Fermanagh, Londonderry, Tyro | Carboniferous |
| Carboniferous Subarea-1; Derrygonnelly-Marble Arch-Cuilcagh | CARBONIFEROUS | Fermanagh | Carboniferous |
| Carboniferous Subarea-10; North County Down | CARBONIFEROUS | Down | Carboniferous |
| Carboniferous Subarea-11; Cranfield-Greencastle | CARBONIFEROUS | Down | Carboniferous |
| Carboniferous Subarea-12; Draperstown-Glenshane Pass-Limavady | CARBONIFEROUS | Londonderry | Carboniferous |
| Carboniferous Subarea-2; Lisnaskea & Fivemiletown | CARBONIFEROUS | Fermanagh, Tyrone | Carboniferous |
| Carboniferous Subarea-3; Kesh-Omagh | CARBONIFEROUS | Fermanagh, Tyrone | Carboniferous |
| Carboniferous Subarea-4; Fintona Block | CARBONIFEROUS | Fermanagh, Tyrone | Carboniferous |
| Carboniferous Subarea-5; Clogher-Aughnacloy | CARBONIFEROUS | Tyrone | Carboniferous |
| Carboniferous Subarea-6; Armagh-Benburb | CARBONIFEROUS | Armagh, Tyrone | Carboniferous |
| Carboniferous Subarea-7; Dungannon-Coalisland-Cookstown | CARBONIFEROUS | Tyrone | Carboniferous |
| Carboniferous Subarea-8; Newtownstewart Outlier | CARBONIFEROUS | Tyrone | Carboniferous |
| Carboniferous Subarea-9; Ballycastle | CARBONIFEROUS | Antrim | Carboniferous |
| Carey Valley | PLEISTOCENE | Antrim | Quaternary |
| Cargan Water/Binvore - site of local interest | PALAEOGENE | Antrim | Tertiary |
| Carganamuck Quarry | CARBONIFEROUS | Armagh | Carboniferous |
| Carnaneigh - Dalradian | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Carnaneigh - Structural | STRUCTURAL GEOLOGY | Antrim | Precambrian |
| Carneal, Glenoe | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary, Cretaceous |
| Carnlough Coastal Peat and Raised Beach Ridges | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary |
| Carnmoney Plug - site of local interest | PALAEOGENE | Antrim | Tertiary |
| Carnmore Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Carrick Lough, Bunnahone Lough and the Sillees River | PALAEONTOLOGICAL REVIEW | Fermanagh | Carboniferous |
| Carrickaness Bridge, The Black Water | CARBONIFEROUS | Tyrone | Carboniferous |
| Carrickarade | PALAEOGENE | Antrim | Tertiary |
| Carrickfergus Castle - site of local interest | PALAEOGENE | Antrim | Tertiary, Triassic |
| Carricklongfield Quarry | CARBONIFEROUS | Tyrone | Carboniferous |
| Carrickmacsparrow Townland | CARBONIFEROUS | Fermanagh | Carboniferous |
| Carrickmore Blister | PALAEOGENE | Antrim | Tertiary, Carboniferous |
| Carrickreagh Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Carrs Glen - site of local interest | JURASSIC | Antrim | Tertiary, Cretaceous, Jurassic, Triassic |
| Cashel - deglacial site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Cashel Quarry - Carboniferous | CARBONIFEROUS | Fermanagh | Carboniferous |
| Cashel Rock - Caledonide Igneous Complex | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| Cashel Rock - Mineralogy | MINERALOGY AND METALLOGENESIS | Tyrone | Ordovician |
| Cashel Rock - Mineralogy - site of local interest | MINERALOGY AND METALLOGENESIS | Tyrone | Ordovician |
| Castle Espie | CARBONIFEROUS | Down | Carboniferous |
| Church Bay, Rathlin Island | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary |
| Cladagh River, Marble Arch | CARBONIFEROUS | Fermanagh | Carboniferous |
| Claragh Townland | CARBONIFEROUS | Fermanagh | Carboniferous |
| Claraghmore Bog | PEAT AND RELATED STRATIGRAPHY | Tyrone | Quaternary |
| Clarehill Quarry | CRETACEOUS | Down | Cretaceous |
| Cliff/Shore Platform Complex between Portstewart and Portrush | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim, Londonderry | Quaternary |
| Clinty Quarry - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Clinty Quarry - site of local interest | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Cloghan Head - site of local interest | LOWER PALAEOZOIC | Down | Silurian |
| Cloghan Hill | CARBONIFEROUS | Fermanagh | Carboniferous |
| Cloghany pothole, Beighy Townland | CARBONIFEROUS | Fermanagh | Carboniferous |
| Clogher Valley | PLEISTOCENE | Tyrone | Quaternary |
| Cloghfin Port, Island Magee | TRIASSIC | Antrim | Cretaceous, Triassic |
| Coalisland Brick Pit | CARBONIFEROUS | Tyrone | Carboniferous |
| Coalpit Bay Lower Palaeozoic | LOWER PALAEOZOIC | Down | Ordovician, Silurian |
| Cole Bridge Stream, Fivemiletown | CARBONIFEROUS | Tyrone | Carboniferous |
| College Mine, Carryhugh | MINERALOGY AND METALLOGENESIS | Armagh | |
| Collin Glen | TRIASSIC | Antrim | Cretaceous, Jurassic, Triassic |
| Coolesker - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Copney Hill | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| County Antrim Karst; Cushenilt Burn | KARST AND CAVES | Antrim | Quaternary, Cretaceous |
| County Antrim Karst; Red Hall Estate | KARST AND CAVES | Antrim | Quaternary, Cretaceous, Jurassic |
| County Antrim Karst; Tievebulliagh area | KARST AND CAVES | Antrim | Quaternary, Tertiary, Cretaceous |
| County Antrim Karst; Turlough | KARST AND CAVES | Antrim | Quaternary, Cretaceous |
| Craig | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Craig Hill Quarry - site of local interest | PALAEOGENE | Antrim | Tertiary |
| Craigahilliar Quarry - Palaeogene | PALAEOGENE | Antrim | Tertiary |
| Craigahulliar Quarry - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Craiganawork, Pomeroy | IGNEOUS - CALEDONIAN | Tyrone | Devonian, Ordovician |
| Craigballyharky and Craigbardahessiagh - Caledonide Igneous Complex | IGNEOUS - CALEDONIAN | Tyrone | Silurian, Ordovician |
| Craigbardahessiagh and Bardahessiagh River - Lower Palaeozoic | LOWER PALAEOZOIC | Tyrone | Silurian, Ordovician |
| Creevagh Hill Old Quarry | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Creevan Burn, Cavanacaw | MINERALOGY AND METALLOGENESIS | Tyrone | |
| Cregagh Glen - site of local interest | LOWER PALAEOZOIC | Down | Ordovician |
| Creggan - Caledonide Igneous Complex | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| Creggan Quarry | CRETACEOUS | Antrim | Cretaceous |
| Crilly House Quarry, Crilly | CARBONIFEROUS | Tyrone | Carboniferous |
| Croagh Mountain - PreCambrian | PRECAMBRIAN - DALRADIAN | Fermanagh | Precambrian |
| Croagh Mountain - Structural | STRUCTURAL GEOLOGY | Fermanagh | Precambrian |
| Crockanaver Quarry, Ederny | CARBONIFEROUS | Fermanagh | Carboniferous |
| Crockfadda - site of local interest | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Croreagh - Mineralogy | MINERALOGY AND METALLOGENESIS | Down | Devonian |
| Croreagh - Mineralogy - site of local interest | MINERALOGY AND METALLOGENESIS | Down | Devonian |
| Crows Glen - site of local interest | TRIASSIC | Antrim | Tertiary, Cretaceous, Triassic |
| Cuilcagh Mountain | CARBONIFEROUS | Fermanagh | Carboniferous |
| Culnafay | PEAT AND RELATED STRATIGRAPHY | Antrim | Quaternary |
| Cultra - Craigavad - Carboniferous | CARBONIFEROUS | Down | Carboniferous |
| Cultra - Permian | PERMIAN | Down | Permian, Carboniferous |
| Cumber - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Cumber Delta, Dungiven Basin | PLEISTOCENE | Londonderry | Quaternary |
| Curraghinalt - site of local interest | MINERALOGY AND METALLOGENESIS | Tyrone | Carboniferous, Ordovician, Precambrian |
| Curraghinalt Burn, near Gortin | MINERALOGY AND METALLOGENESIS | Tyrone | Carboniferous, Precambrian |
| Curraghlane | TRIASSIC | Londonderry | Triassic |
| Cushendun - Bay Hotel to Cave House tunnel - Devonian | DEVONIAN | Antrim | Devonian |
| Cushendun - Caledonide Igneous Complex | IGNEOUS - CALEDONIAN | Antrim | Ordovician, Precambrian |
| Cushendun - Cave House (south of) - Devonian | DEVONIAN | Antrim | Devonian |
| Cushendun Bay - Structural | STRUCTURAL GEOLOGY | Antrim | Precambrian |
| Cushendun Bay and Rock Port - Dalradian | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Dechomet iron mine, south of Dromara | MINERALOGY AND METALLOGENESIS | Down | |
| Demesne Quarry, Glenarm Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Derraghadoan Pit, Dungannon | CARBONIFEROUS | Tyrone | Carboniferous |
| Derrygonnelly road cutting | CARBONIFEROUS | Fermanagh | Carboniferous |
| Derrylin Complex | PLEISTOCENE | Fermanagh | Quaternary |
| Derrynoose - Mineralogy | MINERALOGY AND METALLOGENESIS | Armagh | |
| Derrynoose - Mineralogy - site of local interest | MINERALOGY AND METALLOGENESIS | Armagh | |
| Derrynoyd Townland, near Draperstown | MINERALOGY AND METALLOGENESIS | Londonderry | Devonian |
| Derryvree | PLEISTOCENE | Fermanagh | Quaternary |
| Devlin Quarry, Moneymore Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Devonian - Cross Slieve Group; Cushendun to Port Obe | DEVONIAN | Antrim | Devonian |
| Devonian - Fintona Block south of Tempo-Sixmilecross Fault | DEVONIAN | Fermanagh, Tyrone | Devonian |
| Devonian - Red Arch Formation; Cushendall to Red Arch, Glenariff | DEVONIAN | Antrim | Devonian |
| Devonian - Shanmullagh Formation; Miospore localities | DEVONIAN | Tyrone | Devonian |
| Devonian - Shanmullagh Formation; Stratotype localities | DEVONIAN | Tyrone | Devonian |
| Devonian - Tedd Formation; Tedd Cross Roads Segment | DEVONIAN | Fermanagh | Devonian |
| Dickson's Island, Castleward | MINERALOGY AND METALLOGENESIS | Down | |
| Doagh Glebe Townland Quarries | CARBONIFEROUS | Fermanagh | Carboniferous |
| Dog Leap, Limavady | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Donalds Hill Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Donemana Complex - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Doonan Quarry, Doraville - Mineralogy | MINERALOGY AND METALLOGENESIS | Fermanagh | Tertiary, Devonian |
| Doraville Ridge - Palaeogene | PALAEOGENE | Fermanagh | Tertiary |
| Drain Quarry | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Drapersfield Quarry | TRIASSIC | Londonderry | Triassic |
| Dromore - Devonian | DEVONIAN | Tyrone | Devonian |
| Dromore - Quaternary - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Dromore Big Quarry - Carboniferous | CARBONIFEROUS | Fermanagh | Carboniferous |
| Drumard Water | CARBONIFEROUS | Londonderry | Carboniferous |
| Drumarg | PERMIAN | Armagh | Permian |
| Drumarg - Carboniferous | CARBONIFEROUS | Armagh | Carboniferous |
| Drumarg cave system | KARST AND CAVES | Armagh | Carboniferous, Quaternary |
| Drumbally Hill quarry, Desertmartin | CARBONIFEROUS | Londonderry | Carboniferous |
| Drumharvey Townland quarry | DEVONIAN | Tyrone | Devonian |
| Drummahon Lane | CARBONIFEROUS | Tyrone | Carboniferous |
| Drummond Quarry, Aughnacloy | CARBONIFEROUS | Tyrone | Carboniferous |
| Dundrum Bay and Murlough | COASTAL PROCESSES AND SEALEVEL HISTORY | Down | Quaternary |
| Dungoran - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Dunnaglea-Larry Bane Bay | CRETACEOUS | Antrim | Cretaceous |
| Dunnamanagh Complex | PLEISTOCENE | Tyrone | Quaternary |
| Dunseverick Slip | PALAEOGENE | Antrim | Tertiary |
| Eagles Rocks | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| East Cuilcagh - Aghatirourke Pot | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Badger Pot | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Black Pot | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Goat Pot | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Long Pot | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Peter Bryant's Bullock Hole | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Peter Bryant's Hole | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Pigeon Pots | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Polliniska | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Pollnaclanawley | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Pollnatagha | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Sheep Pot | KARST AND CAVES | Fermanagh | Quaternary |
| East Cuilcagh - Tea Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Eastern Garron Plateau, County Antrim | KARST AND CAVES | Antrim | Quaternary, Tertiary, Cretaceous, Jurassic |
| Eden Lodge | STRUCTURAL GEOLOGY | Londonderry | Tertiary, Triassic, Carboniferous, Precambrian |
| Ederney Quary - Carboniferous | CARBONIFEROUS | Fermanagh | Carboniferous |
| Ederny Quarry - Structural | STRUCTURAL GEOLOGY | Fermanagh | Carboniferous |
| Escort Port | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Fairhead | PALAEOGENE | Antrim | Tertiary |
| Fallaghearn - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Fallahogy Bog (Wolf Island) | PEAT AND RELATED STRATIGRAPHY | Londonderry | Quaternary |
| Faragandoo | PALAEONTOLOGICAL REVIEW | Antrim | Carboniferous |
| Fardross Stream - Carboniferous | CARBONIFEROUS | Tyrone | Carboniferous |
| Fardross Stream - Structural | STRUCTURAL GEOLOGY | Tyrone | Carboniferous |
| Fardrum; Fardrum Turlough | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Fardrum; Roosky Turlough | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Faughan and Dungiven Basins - Banagher | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Cumber | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Derrynaflaw | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Enagh | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Fawney | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Gosheden | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Overview | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Tamnagh | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - Templemoyle | PLEISTOCENE | Londonderry | Quaternary |
| Faughan and Dungiven Basins - The Murnies | PLEISTOCENE | Londonderry | Quaternary |
| Fintona Hills Complex - Ballinamallard Esker | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Fintona Hills Complex - Crockfadda outwash-moraine system | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Fintona Hills Complex - Dromore outwash-moraine system | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Fintona Hills Complex - Dungoran kame-esker-outwash system | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Fintona Hills Complex - Newtownsaville Esker | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Fintona Hills Complex - Overview | PLEISTOCENE | Fermanagh, Tyrone | Quaternary |
| Foyle Valley Complex | PLEISTOCENE | Londonderry | Quaternary |
| Fruitfield Delta, Limavady | PLEISTOCENE | Londonderry | Quaternary |
| Gadalough | PRECAMBRIAN - DALRADIAN | Fermanagh | Precambrian |
| Garrison; County River natural bridge | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Garrison; Lough Formal | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Garrison; Roogagh River ground bridge | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Garron Point-Cloghastucan | CRETACEOUS | Antrim | Cretaceous |
| Garry Bog | PEAT AND RELATED STRATIGRAPHY | Antrim | Quaternary |
| Garvagh Burn | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Garvaghullion Bog | PEAT AND RELATED STRATIGRAPHY | Tyrone | Quaternary |
| Ghann River Valley Moraines - site of local interest | PLEISTOCENE | Down | Quaternary |
| Giant's Causeway - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Giant's Causeway - Palaeogene | PALAEOGENE | Antrim | Tertiary |
| Giant's Grave section | CARBONIFEROUS | Fermanagh | Carboniferous |
| Gibsons Quarry, Portadown Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Glarryford | PLEISTOCENE | Antrim | Quaternary |
| Glasmullen Townland stream | DEVONIAN | Antrim | Devonian |
| Glas-na-Bradan - site of local interest | TRIASSIC | Antrim | Tertiary, Triassic |
| Glebe House, Rathmullan, Minerstown | MINERALOGY AND METALLOGENESIS | Down | |
| Glenarm Quarry | CRETACEOUS | Antrim | Cretaceous |
| Glen-Coolcran Townlands stream | CARBONIFEROUS | Fermanagh | Carboniferous |
| Glendarragh Burn, Glenlark | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Glendurragh River, Lack | CARBONIFEROUS | Fermanagh | Carboniferous |
| Glenelly/Owenkillew Valleys (Gortin) | PLEISTOCENE | Tyrone | Quaternary |
| Glenlark | MINERALOGY AND METALLOGENESIS | Tyrone | |
| Glenmornan River, Artigarvan | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Glensawisk Burn - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Glenshesk Valley | PLEISTOCENE | Antrim | Quaternary |
| Glenwest Bog | PEAT AND RELATED STRATIGRAPHY | Fermanagh | Quaternary |
| Golan Burn, Gortin | PRECAMBRIAN - DALRADIAN | Tyrone | Carboniferous, Precambrian |
| Goraghwood Quarry | IGNEOUS - CALEDONIAN | Armagh | Devonian, Silurian |
| Gosheden - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Grangemore and Castlerock Sand Dunes | COASTAL PROCESSES AND SEALEVEL HISTORY | Londonderry | Quaternary |
| Gransha | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Greenan Mountain - Carboniferous | CARBONIFEROUS | Tyrone | Carboniferous |
| Greenan Mountain - Mineralogy | MINERALOGY AND METALLOGENESIS | Tyrone | Precambrian |
| Greencastle Bay (NW end), Carlingford Lough - Carboniferous | CARBONIFEROUS | Down | Carboniferous |
| Greencastle Bay middle beach, Carlingford Lough - Carboniferous | CARBONIFEROUS | Down | Carboniferous |
| Greenisland - site of local interest | PALAEOGENE | Antrim | Quaternary, Tertiary, Triassic |
| Helens Bay Grey Point Lower Palaeozoic | LOWER PALAEOZOIC | Down | Ordovician |
| Henry's Bridge, Glensass Burn | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Hill's Port, The Gobbins - site of local interest | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Hill's Port, The Gobbins, Island Magee - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Iniscarn Townland, near Desertmartin | CARBONIFEROUS | Londonderry | Carboniferous |
| Inisway Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Introduction to Clay-with-Flints of Northern Ireland | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Introduction to the Caledonian Igneous Complexes of Northern Ireland | IGNEOUS - CALEDONIAN | Antrim, Armagh, Down, Londonderry, Tyrone | Devonian, Silurian, Ordovician, Precambrian |
| Introduction to the Dalradian rocks of Northern Ireland | PRECAMBRIAN - DALRADIAN | Antrim, Londonderry, Tyrone | Precambrian |
| Introduction to the diatomite deposits of Northern Ireland | PEAT AND RELATED STRATIGRAPHY | | Quaternary |
| Introduction to the glacial Sand and Gravel Landscapes of Northern Ireland | PLEISTOCENE | Antrim, Armagh, Down, Fermanagh, Londonderry, Tyro | Quaternary |
| Introduction to the Late Quaternary and Holocene of Northern Ireland | PEAT AND RELATED STRATIGRAPHY | Antrim, Fermanagh, Londonderry, Tyrone | Quaternary |
| Introduction to the Palaeontological sites of Northern Ireland | PALAEONTOLOGICAL REVIEW | Antrim, Armagh, Down, Fermanagh, Londonderry, Tyro | Quaternary, Tertiary, Cretaceous, Jurassic, Triassic, Permian, Carboniferous, Devonian, Silurian, Ordovician, Precambrian |
| Introduction to the Precambrian of Northern Ireland | PRECAMBRIAN - DALRADIAN | Antrim, Fermanagh, Londonderry, Tyrone | Precambrian |
| Introduction to the Pre-Dalradian rocks of Northern Ireland | PRECAMBRIAN - DALRADIAN | Fermanagh, Tyrone | Precambrian |
| Introduction to the Structural Geology of Northern Ireland | STRUCTURAL GEOLOGY | Antrim, Down, Fermanagh, Londonderry, Tyrone | |
| Kearney Point - Caledonide Igneous Complex | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Kearney Point Knockinelder Bay Lower Palaeozoic | STRUCTURAL GEOLOGY | Down | Silurian |
| Keenaghan - Mineralogy | MINERALOGY AND METALLOGENESIS | Fermanagh | |
| Keenaghan Lough - Carboniferous | CARBONIFEROUS | Fermanagh | Carboniferous |
| Keenaght Water, Cullion Townland | CARBONIFEROUS | Londonderry | Carboniferous |
| Kilcoan, Island Magee | CRETACEOUS | Antrim | Cretaceous |
| Kildoag Quarry | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Kilkeel Cliff - site of local interest | PLEISTOCENE | Down | Quaternary |
| Killard Point | PLEISTOCENE | Down | Quaternary |
| Killard Point | PLEISTOCENE | Down | Quaternary |
| Killey Bridge | LOWER PALAEOZOIC | Tyrone | Ordovician |
| Killuney Stream | CARBONIFEROUS | Armagh | Carboniferous |
| Killygarry River | CARBONIFEROUS | Fermanagh | Carboniferous |
| Kilmore-Drumbullog townlands ditch, Newtownbutler | CARBONIFEROUS | Fermanagh | Carboniferous |
| Kilrea | PLEISTOCENE | Antrim, Londonderry | Quaternary |
| Kilrea - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Kiltierney Deer Park; Fiddler's Cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Kittybane Quarry, Prehen | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Knockaraven Townland quarry | DEVONIAN | Tyrone | Devonian |
| Knockinelder Bay and Kearney Point - Structural | STRUCTURAL GEOLOGY | Down | Silurian |
| Knockmore Cliff | CARBONIFEROUS | Fermanagh | Carboniferous |
| Knockmore-Pollaraftra; Arches | KARST AND CAVES | Fermanagh | Quaternary |
| Knockmore-Pollaraftra; Crinoid Cavern | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Doagh Lough relict caves | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Garrison Cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Legland Rising | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Lettered Cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Limestone pavement | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Meander Cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Pollaraftra | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Pollnamadda | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Pollnamansh | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Poulnamuck | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Roadside Pot | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockmore-Pollaraftra; Whitehouse Cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knocknacarry Bridge, Cushendun | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Knockninny & Molly Mountain; Knockninny relict cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Knockninny & Molly Mountain; Molly Stream Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Ladyhill Quarry | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Lagan Valley | PLEISTOCENE | Antrim | Quaternary |
| Laghta Bridge, Tievenameena - Mineralogy | MINERALOGY AND METALLOGENESIS | Tyrone | |
| Laghta Bridge, Tievenameena - site of local interest | MINERALOGY AND METALLOGENESIS | Tyrone | |
| Largy Hill, Lack | MINERALOGY AND METALLOGENESIS | Tyrone | Precambrian |
| Largy Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Larkhill - Mineralogy | MINERALOGY AND METALLOGENESIS | Fermanagh | Precambrian |
| Larkhill - PreCambrian | PRECAMBRIAN - DALRADIAN | Fermanagh | Precambrian |
| Larrybane Stalactite Cave, Larrybane Bay | KARST AND CAVES | Antrim | Quaternary, Cretaceous |
| Leckpatrick Point | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Letterbrat Quarry, Plumbridge | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Lifeboat House, Cushendall | DEVONIAN | Antrim | Devonian |
| Lifeboat House, Cushendall - small island south of | DEVONIAN | Antrim | Devonian |
| Lighthouse and Mew Islands - site of local interest | LOWER PALAEOZOIC | Down | Ordovician |
| Lime Hill Farm | LOWER PALAEOZOIC | Tyrone | Quaternary, Silurian |
| Lindsay's Leap, Mourne Mountains | MINERALOGY AND METALLOGENESIS | Down | Tertiary |
| Linford karst | KARST AND CAVES | Antrim | Cretaceous, Quaternary |
| Lisdoo Townland pit | DEVONIAN | Tyrone | Devonian |
| Lisnaskea road cutting | CARBONIFEROUS | Fermanagh | Carboniferous |
| Lissan Water | TRIASSIC | Londonderry | Triassic |
| Little Deer Park Quarries - site of local interest | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Little Deer Park Quarries, Glenarm | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Little River and Slate Quarry Bridge | PALAEONTOLOGICAL REVIEW | Tyrone | Silurian, Ordovician |
| Lough Fea | PLEISTOCENE | Londonderry, Tyrone | Quaternary |
| Lough Fea - site of local interest | PLEISTOCENE | Londonderry, Tyrone | Quaternary |
| Lough Foyle Intertidal Flats | COASTAL PROCESSES AND SEALEVEL HISTORY | Londonderry | Quaternary |
| Loughan Bay | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Loughareema - Dalradian | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Loughareema - Quaternary | PLEISTOCENE | Antrim | Quaternary |
| Loughermore Mountain | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Loughmacrory | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| Lurgan River, Mullylusty Townland | CARBONIFEROUS | Fermanagh | Carboniferous |
| Lurganboy - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Magherameena Quarry, Belleek | CARBONIFEROUS | Fermanagh | Carboniferous |
| Magheramorne Quarry, Larne Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Magho Cliffs | CARBONIFEROUS | Fermanagh | Carboniferous |
| Magilligan Coastal Complex | COASTAL PROCESSES AND SEALEVEL HISTORY | Londonderry | Quaternary |
| Makenny Townland stream, near The Hollow House | CARBONIFEROUS | Tyrone | Carboniferous |
| Marble Arch Karst; Aghinrawn Cave | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Carricknacoppan Caves | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Cat Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Cat's Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Island Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; John Thomas' Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Legnabrocky Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Marble Arch Cave | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Mastodon | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; McGovern's Sink, Freda's Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Monastir Caves | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Pollasillagh | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Pollasumera | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Pollbwee | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Pollnabrindle | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Pollnagapple | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Pollnagollum | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Pollthainarees | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Schoolhouse Cave | KARST AND CAVES | Fermanagh | Quaternary |
| Marble Arch Karst; Sruh Croppa Cave | KARST AND CAVES | Fermanagh | Quaternary, Tertiary |
| Marble Arch Karst; Upper Cradle Hole and Lower Cradle Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Marlbank-Cuilcagh Mountain Region; East Cuilcagh Overview | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Marlbank-Cuilcagh Mountain Region; Marble Arch Karst | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Marlbank-Cuilcagh Mountain Region; Prod's Pot - Cascades Rising Area | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Marlbank-Cuilcagh Mountain Region; Tullyhona, Brookfield and Trien | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Marlbank-Cuilcagh Mountain Region; Western Marlbank | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| McIlroy's Port - Palaeogene | PALAEOGENE | Antrim | Tertiary |
| McIlroy's Port to Portmuck - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| McNally's Burn - Dalradian | PRECAMBRIAN - DALRADIAN | Tyrone | Ordovician, Precambrian |
| McNally's Burn - Structural | STRUCTURAL GEOLOGY | Tyrone | Ordovician, Precambrian |
| Middletown Burn, Culvacullion Townland | CARBONIFEROUS | Tyrone | Carboniferous |
| Millin Bay | STRUCTURAL GEOLOGY | Down | Silurian |
| Milltown | TRIASSIC | Armagh, Tyrone | Triassic, Carboniferous |
| Milltown, Strabane | MINERALOGY AND METALLOGENESIS | Tyrone | |
| Miner's Hole, Silent Valley | MINERALOGY AND METALLOGENESIS | Down | Tertiary |
| Minnis North Mudflow | PALAEONTOLOGICAL REVIEW | Antrim | Cretaceous, Jurassic |
| Moffatt's Quarry, Drumquin | CARBONIFEROUS | Tyrone | Carboniferous |
| Moneymore - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Moneymore Complex | PLEISTOCENE | Tyrone | Quaternary |
| Moneyneena - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Montiaghroe Townland Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Moore Lodge Moraine - site of local interest | PLEISTOCENE | Down | Quaternary |
| Mountfield Old Quarry - Dalradian | PRECAMBRIAN - DALRADIAN | Tyrone | Ordovician, Precambrian |
| Mountfield Quarry - Structural | STRUCTURAL GEOLOGY | Tyrone | Ordovician, Precambrian |
| Mourne Plain Complex - Cranfield Moraine | PLEISTOCENE | Down | Quaternary |
| Mourne Plain Complex - Glenloughan Pit | PLEISTOCENE | Down | Quaternary |
| Mourne Plain Complex - Kilkeel Cliff | PLEISTOCENE | Down | Quaternary |
| Mourne Plain Complex - Moore Lodge Moraine | PLEISTOCENE | Down | Quaternary |
| Mourne Plain Complex - Overview | PLEISTOCENE | Down | Quaternary |
| Mourne Plain Complex - Sandpiper Pit | PLEISTOCENE | Down | Quaternary |
| Mourne Plain Complex - Tullyframe Pit | PLEISTOCENE | Down | Quaternary |
| Mournes - Ben Crom | PALAEOGENE | Down | Tertiary |
| Mournes - Bloody Bridge Cone-sheet | PALAEOGENE | Down | Tertiary, Silurian |
| Mournes - Bloody Bridge River Section | PALAEOGENE | Down | Tertiary, Silurian |
| Mournes - Cone-sheet and Dyke Swarm - Overview | PALAEOGENE | Down | Tertiary |
| Mournes - Diamond Rocks - Mineralogy | MINERALOGY AND METALLOGENESIS | Down | Tertiary |
| Mournes - Dunmore Head, Dykes Nos. 60, 61 & 63 | PALAEOGENE | Down | Tertiary |
| Mournes - Dyke No 124 at Samuel's Port, Annalong | PALAEOGENE | Down | Tertiary |
| Mournes - Eagle Mountain, Slievemoughanmore, Pigeon Rock Mountain | PALAEOGENE | Down | Tertiary, Silurian |
| Mournes - Eagle Rock | PALAEOGENE | Down | Tertiary, Silurian |
| Mournes - Glasdrumman Port Cone-sheet | PALAEOGENE | Down | Tertiary |
| Mournes - Green Harbour Dyke No. 55 | PALAEOGENE | Down | Tertiary |
| Mournes - Gruggandoo Quartz Porphyry Sheet | PALAEOGENE | Down | Tertiary |
| Mournes - Kilbroney River Section | PALAEOGENE | Down | Tertiary |
| Mournes - Lindsay's Leap, Thomas's Mountain | PALAEOGENE | Down | Tertiary |
| Mournes - Rocky Mountain | PALAEOGENE | Down | Tertiary |
| Mournes - Spelga Dam | PALAEOGENE | Down | Tertiary, Silurian |
| Mournes - The Diamond Rocks | PALAEOGENE | Down | Tertiary |
| Mournes - The Granites - Overview | PALAEOGENE | Down | Tertiary |
| Mournes Coast Raised Beach - site of local interest | PLEISTOCENE | Down | Quaternary |
| Moyard - site of local interest | PLEISTOCENE | Down | Tertiary, Triassic, Permian |
| Moygannon River Valley Moraines - site of local interest | PLEISTOCENE | Down | Quaternary |
| Moyola River | PALAEONTOLOGICAL REVIEW | Londonderry | Carboniferous |
| Moyola Valley Complex | PLEISTOCENE | Londonderry | Quaternary |
| Muck Island Tombolo, Island Magee | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary |
| Mullaghcarbatagh | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Mullaghmore Col | PLEISTOCENE | Londonderry, Tyrone | Quaternary |
| Mullaghsillogagh Quarries, Clabby | CARBONIFEROUS | Fermanagh | Carboniferous |
| Mullynaskeagh Clay Pit | PALAEONTOLOGICAL REVIEW | Fermanagh | Carboniferous |
| Murlough Bay | PALAEONTOLOGICAL REVIEW | Antrim | Cretaceous |
| Murnies Delta, Dungiven Basin | PLEISTOCENE | Londonderry | Quaternary |
| Murrins Complex - Cashel Outwash | PLEISTOCENE | Tyrone | Quaternary |
| Murrins Complex - Coolesker/Beragh Eskers | PLEISTOCENE | Tyrone | Quaternary |
| Murrins Complex - Glensawisk Burn Delta | PLEISTOCENE | Tyrone | Quaternary |
| Murrins Complex - Laght Hill Retreat Moraines | PLEISTOCENE | Tyrone | Quaternary |
| Murrins Complex - Lough Fingrean Frontal Moraines | PLEISTOCENE | Tyrone | Quaternary |
| Murrins Complex - Overview | PLEISTOCENE | Tyrone | Quaternary |
| Mveela More | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| Newry By-pass | IGNEOUS - CALEDONIAN | Armagh | Devonian |
| Newtownbutler Stream | CARBONIFEROUS | Fermanagh | Carboniferous |
| Newtownsaville - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Noon's Hole-Arch Cave; Aughakeeran Pot | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Noon's Hole-Arch Cave; Crunthelagh Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Noon's Hole-Arch Cave; Killydrum Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Noon's Hole-Arch Cave; Limestone pavement | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Noon's Hole-Arch Cave; Noon's Hole-Arch Cave System | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Noon's Hole-Arch Cave; Old Barr Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Noon's Hole-Arch Cave; Pollanaffrin | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Noon's Hole-Arch Cave; Seltanahunny Sink | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| North Star Colliery - Ballycastle Coalfield | CARBONIFEROUS | Antrim | Carboniferous |
| Northeast Mournes Complex - Northeast Mournes Moraines | PLEISTOCENE | Down | Quaternary |
| Northeast Mournes Complex - Northeast Mournes Raised Beaches | PLEISTOCENE | Down | Quaternary |
| Northeast Mournes Complex - Overview | PLEISTOCENE | Down | Quaternary |
| Orlock Bridge Lower Palaeozoic | STRUCTURAL GEOLOGY | Down | Ordovician, Silurian |
| Orlock Bridge - Structural | STRUCTURAL GEOLOGY | Down | Silurian, Ordovician |
| Other Karst Sites in County Antrim | KARST AND CAVES | Antrim | Quaternary, Tertiary, Cretaceous |
| Oughtboy Burn | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Oughtmore Mountain - PreCambrian | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Oughtmore Mountain - Structural | STRUCTURAL GEOLOGY | Tyrone | Precambrian |
| Outlying Sites in Fermanagh & Tyrone; Fardrum | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Outlying sites in Fermanagh & Tyrone; Garrison | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Outlying Sites in Fermanagh & Tyrone; Kiltierney Deer Park | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Outlying Sites in Fermanagh & Tyrone; Knockninny & Molly Mountain | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Outlying Sites in Fermanagh & Tyrone; Lough Lee-Binnawooda area | KARST AND CAVES | Tyrone | Quaternary, Carboniferous |
| Outlying Sites in Fermanagh & Tyrone; Slieve Beagh area | KARST AND CAVES | Fermanagh, Tyrone | Quaternary, Carboniferous |
| Plaister Quarry, Aughnacloy | CARBONIFEROUS | Tyrone | Carboniferous |
| Pollaphuca, Mourne Mountains | MINERALOGY AND METALLOGENESIS | Down | Tertiary |
| Pomeroy - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Pomeroy Complex | PLEISTOCENE | Tyrone | Quaternary |
| Port Calliagh-Ballycastle | CRETACEOUS | Antrim | Cretaceous |
| Port Moon (Contham Head) | PALAEOGENE | Antrim | Tertiary |
| Port Obe, Cushendall | DEVONIAN | Antrim | Devonian |
| Portballintrae | PLEISTOCENE | Antrim | Quaternary |
| Portmuck East - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary, Cretaceous |
| Portmuck, Island Magee | CRETACEOUS | Antrim | Cretaceous, Jurassic |
| Portnaloub | PALAEONTOLOGICAL REVIEW | Antrim | Carboniferous |
| Portrush - Jurassic | JURASSIC | Antrim | Tertiary, Jurassic |
| Portrush NNR | PALAEOGENE | Antrim | Tertiary, Jurassic |
| Portrush West Strand Coastal Peat | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary |
| Portstewart Strand Sand Dunes | COASTAL PROCESSES AND SEALEVEL HISTORY | Londonderry | Quaternary |
| Prehen Quarry - Dalradian | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Prehen Quarry - Structural | STRUCTURAL GEOLOGY | Londonderry | Precambrian |
| Prod's Pot - Cascades; Cascades Rising | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Prod's Pot - Cascades; Goat Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Prod's Pot - Cascades; Gortmaconnell Pots | KARST AND CAVES | Fermanagh | Quaternary |
| Prod's Pot - Cascades; Harry Jacques Memorial Cavern | KARST AND CAVES | Fermanagh | Quaternary |
| Prod's Pot - Cascades; Pelvis Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Prod's Pot - Cascades; Prod's Pot | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Prod's Pot - Cascades; Smokey Mountain Sink | KARST AND CAVES | Fermanagh | Quaternary |
| Prod's Pot - Cascades; Westminster Dig | KARST AND CAVES | Fermanagh | Quaternary |
| Purdy's Burn - site of local interest | LOWER PALAEOZOIC | Down | Silurian, Ordovician |
| Rahallan Townland | CARBONIFEROUS | Fermanagh | Carboniferous |
| Rathfriland | IGNEOUS - CALEDONIAN | Down | Devonian |
| Rathlin Island | PALAEOGENE | Antrim | Tertiary |
| Red Arch, north of Waterfoot | DEVONIAN | Antrim | Devonian |
| Red Arch, Waterfoot coastal exposures | DEVONIAN | Antrim | Devonian |
| Reyfad-Carrickbeg; Braad Dry Valley | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Carrickbeg | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Fairy Cave | KARST AND CAVES | Fermanagh | Quaternary |
| Reyfad-Carrickbeg; Ivy Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Reyfad-Carrickbeg; Little Reyfad | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Mad Pot | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Murphy's Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Reyfad-Carrickbeg; Oweyglass Caves | KARST AND CAVES | Fermanagh | Quaternary |
| Reyfad-Carrickbeg; Pollbeg | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Pollmore | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Pollnacrom | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Polltullybrack | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Rattle Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Reyfad-Carrickbeg; Reyfad Pot | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Reyfad-Carrickbeg; Seltanacool Sinks | KARST AND CAVES | Fermanagh | Quaternary |
| River Blackwater, Benburb | CARBONIFEROUS | Armagh, Tyrone | Carboniferous |
| Rock Road Quarry, Armagh | CARBONIFEROUS | Armagh | Carboniferous |
| Rockfield (Mitton's) Quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Roddan's Port | PLEISTOCENE | Down | Quaternary |
| Roddan's Port - site of local interest | PLEISTOCENE | Down | Quaternary |
| Rosemount - site of local interest | LOWER PALAEOZOIC | Down | Silurian |
| Runkerry Strand, Bushfoot | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary |
| Rushindoo Townland quarry | CARBONIFEROUS | Fermanagh | Carboniferous |
| Rylagh Burn, near Omagh | MINERALOGY AND METALLOGENESIS | Tyrone | Carboniferous, Precambrian |
| Sandy Braes - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Sandy Braes - Palaeogene | PALAEOGENE | Antrim | Tertiary |
| Scalp Hill | IGNEOUS - CALEDONIAN | Tyrone | Ordovician |
| Scawt Hill | PALAEOGENE | Antrim | Tertiary, Cretaceous |
| Scawt Hill - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary, Cretaceous |
| Scrabo Hill - Palaeogene | PALAEOGENE | Down | Tertiary, Triassic |
| Scrabo Hill - Triassic | TRIASSIC | Down | Tertiary, Triassic |
| Shannaghan Hill | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Shanvin | CARBONIFEROUS | Tyrone | Carboniferous |
| Shaque Hill, near Dundrum | MINERALOGY AND METALLOGENESIS | Down | |
| Sillees River, Glenasheevar | PALAEONTOLOGICAL REVIEW | Fermanagh | Carboniferous |
| Six Mile Water | PLEISTOCENE | Tyrone | Quaternary |
| Skeagh and Craigcluggan | PALAEOGENE | Antrim | Tertiary |
| Slatmore Quarry, Clogher | CARBONIFEROUS | Tyrone | Carboniferous |
| Slemish Mountain | PALAEOGENE | Antrim | Tertiary |
| Slieve Croob | IGNEOUS - CALEDONIAN | Down | Devonian, Silurian |
| Slieve Gallion | PEAT AND RELATED STRATIGRAPHY | Londonderry | Quaternary |
| Slieve Gullion Ring - Cam Lough Quarry | PALAEOGENE | Armagh | Tertiary, Devonian, Silurian |
| Slieve Gullion Ring - Cloghinny 'pillow lavas' | PALAEOGENE | Armagh | Tertiary |
| Slieve Gullion Ring - Crooked Road | PALAEOGENE | Armagh | Tertiary, Devonian |
| Slieve Gullion Ring - Forest Quarry | PALAEOGENE | Armagh | Tertiary |
| Slieve Gullion Ring - Glendesha Forest | PALAEOGENE | Armagh | Tertiary |
| Slieve Gullion Ring - Mullaghbawn Central | PALAEOGENE | Armagh | Tertiary, Devonian |
| Slieve Gullion Ring - Mullaghbawn North | PALAEOGENE | Armagh | Tertiary |
| Slieve Gullion Ring - Mullaghbawn South | PALAEOGENE | Armagh | Tertiary, Devonian |
| Slieve Gullion Ring - Overview | PALAEOGENE | Armagh | Tertiary, Devonian |
| Slieve Gullion Ring - Sarah Daly's Bridge | PALAEOGENE | Armagh | Tertiary |
| Slieve Gullion Ring - Slieve Gullion | PALAEOGENE | Armagh | Tertiary |
| Slievemenagh, near Greencastle | MINERALOGY AND METALLOGENESIS | Tyrone | Ordovician |
| Slievenagriddle - site of local interest | MINERALOGY AND METALLOGENESIS | Down | |
| Sluggan Bog | PEAT AND RELATED STRATIGRAPHY | Antrim | Quaternary |
| Soldierstown Quarry, Moira Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Spincha Burn, Cluntygeeragh Townland | CARBONIFEROUS | Londonderry | Carboniferous |
| Sruhanleanantawey | IGNEOUS - CALEDONIAN | Londonderry | Ordovician |
| St. John's Point | PALAEOGENE | Down | Tertiary |
| Strabane Quarry | PRECAMBRIAN - DALRADIAN | Tyrone | Precambrian |
| Straduff Quarry - Carboniferous | CARBONIFEROUS | Tyrone | Carboniferous |
| Straduff Quarry - Structural | STRUCTURAL GEOLOGY | Tyrone | Carboniferous |
| Strangford Lough Intertidal Flats | COASTAL PROCESSES AND SEALEVEL HISTORY | Down | Quaternary |
| Tamnagh - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Tamney - site of local interest | PRECAMBRIAN - DALRADIAN | Londonderry | Precambrian |
| Tamny Townland, Feeny | MINERALOGY AND METALLOGENESIS | Londonderry | |
| Tardree Mountain | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Tedd Cross Roads Segment, Cloghfin | DEVONIAN | Fermanagh | Devonian |
| Templemoyle - site of local interest | PLEISTOCENE | Londonderry | Quaternary |
| Tempo Valley Delta Complex - Glengesh and Tattinweer | PLEISTOCENE | Tyrone | Quaternary |
| Tempo Valley Delta Complex - Lough Eyes | PLEISTOCENE | Tyrone | Quaternary |
| Tempo Valley Delta Complex - Overview | PLEISTOCENE | Tyrone | Quaternary |
| Tempo Valley Delta Complex - Tempo and Pubble | PLEISTOCENE | Tyrone | Quaternary |
| Tempo Valley Delta Complex - Upland areas of the Fintona Hills | PLEISTOCENE | Tyrone | Quaternary |
| The Carboniferous System in N. Ireland - Introduction | CARBONIFEROUS | Antrim, Armagh, Down, Fermanagh, Londonderry, Tyro | Carboniferous |
| The Cretaceous System in N. Ireland - Introduction | CRETACEOUS | Antrim, Down, Londonderry, Tyrone | Cretaceous |
| The Devonian System in N. Ireland - Introduction | DEVONIAN | Antrim, Fermanagh, Tyrone | Devonian |
| The Jurassic System in N. Ireland - Introduction | JURASSIC | Antrim, Down, Londonderry, Tyrone | Jurassic |
| The Permian System in N. Ireland - Introduction | PERMIAN | Antrim, Armagh, Down, Tyrone | Permian |
| The Triassic System in N. Ireland - Introduction | TRIASSIC | Antrim, Armagh, Down, Londonderry, Tyrone | Triassic |
| Tievebulliagh - Mineralogy | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| Tievebulliagh - Palaeogene | PALAEOGENE | Antrim | Tertiary, Cretaceous |
| Tieveshilly Carrstown Lower Palaeozoic | LOWER PALAEOZOIC | Down | Ordovician, Silurian |
| Tintagh, Slieve Gallion | IGNEOUS - CALEDONIAN | Londonderry | Devonian, Ordovician |
| Tircar Stream, Fivemiletown | CARBONIFEROUS | Tyrone | Carboniferous |
| Tircrevan Burn Clay-with-Flints | CLAY-WITH-FLINTS | | Cretaceous, Tertiary |
| Tircrevan Burn - Palaeontology | PALAEONTOLOGICAL REVIEW | Londonderry | Cretaceous |
| Tircreven Burn (Mesozoic stratigraphy) | CRETACEOUS | Londonderry | Cretaceous, Jurassic |
| Tiroony - site of local interest | PLEISTOCENE | Tyrone | Quaternary |
| Toome | PEAT AND RELATED STRATIGRAPHY | Londonderry | Quaternary |
| Torr Head - Dalradian | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Torr Head - Dalradian | PRECAMBRIAN - DALRADIAN | Antrim | Precambrian |
| Torr Head - Structural | STRUCTURAL GEOLOGY | Antrim | Precambrian |
| Tullanaguiggy | CARBONIFEROUS | Fermanagh | Carboniferous |
| Tullyard Townland stream | CARBONIFEROUS | Tyrone | Carboniferous |
| Tullybrick | IGNEOUS - CALEDONIAN | Londonderry | Ordovician |
| Tullyconnell | PALAEONTOLOGICAL REVIEW | Tyrone | Permian |
| Tullydonnell, near Silverbridge | MINERALOGY AND METALLOGENESIS | Armagh | |
| Tullyhona - Carboniferous | CARBONIFEROUS | Fermanagh | Carboniferous |
| Tullyhona, Brookfield and Trien; Brookfield Sink No.1 | KARST AND CAVES | Fermanagh | Quaternary |
| Tullyhona, Brookfield and Trien; Dick's Sinks | KARST AND CAVES | Fermanagh | Quaternary |
| Tullyhona, Brookfield and Trien; Tullyhona Rising Cave | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Tullyhona, Brookfield and Trien; Tullyhona Rock Pots | KARST AND CAVES | Fermanagh | Quaternary |
| Tullyhona, Brookfield and Trien; Whiskey Holes | KARST AND CAVES | Fermanagh | Quaternary |
| Tullyratty, near Castleward | MINERALOGY AND METALLOGENESIS | Down | |
| Waterloo - Penarth and Jurassic | JURASSIC | Antrim | Cretaceous, Jurassic, Triassic |
| Western Marlbank; Dave's Hole | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Gortaree Sink | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Hammer Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Hanging Rock Risings - East Rising | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Killykeeghan Pots | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Legacapple | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Marlbank Rising | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Polltullyard | KARST AND CAVES | Fermanagh | Quaternary, Carboniferous |
| Western Marlbank; Revolution Pot | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; Tullynakeeragh Gravel Lake | KARST AND CAVES | Fermanagh | Quaternary |
| Western Marlbank; West Rising and Pollnasalac | KARST AND CAVES | Fermanagh | Quaternary |
| Western Moraine Complex - Moygannon River Valley Moraines | PLEISTOCENE | Down | Quaternary |
| Western Mournes Complex - Ghann River Moraines | PLEISTOCENE | Down | Quaternary |
| Western Mournes Complex - Kilbroney River Valley Moraines | PLEISTOCENE | Down | Quaternary |
| Western Mournes Complex - Overview | PLEISTOCENE | Down | Quaternary |
| Western Mournes Complex - Western lowlands, drumlins and moraines | PLEISTOCENE | Down | Quaternary |
| Western Mournes Lowlands, Drumlins and Moraines | PLEISTOCENE | Down | Quaternary |
| Whiskin Rocks | STRUCTURAL GEOLOGY | Down | Silurian |
| White Head | CRETACEOUS | Antrim | Cretaceous |
| White House Port, Cloghy | STRUCTURAL GEOLOGY | Down | Silurian |
| White Mountain Quarry, near Lisburn | MINERALOGY AND METALLOGENESIS | Antrim | Tertiary |
| White Park Bay | CRETACEOUS | Antrim | Cretaceous, Jurassic |
| White Rocks - Coastal Geomorphology | COASTAL PROCESSES AND SEALEVEL HISTORY | Antrim | Quaternary, Cretaceous |
| White Rocks - Cretaceous | CRETACEOUS | Antrim | Cretaceous |
| White Rocks - Palaeogene | PALAEOGENE | Antrim | Tertiary, Cretaceous |
| Whitespots - Conlig lead mines | MINERALOGY AND METALLOGENESIS | Down | |
| Woodgrange | PLEISTOCENE | Down | Quaternary |
| Yate's Corner - site of local interest | LOWER PALAEOZOIC | Down | Silurian, Ordovician |