List of fossiliferous stratigraphic units in Wales

Group or Formation Period Notes
Aber Mawr ShaleOrdovician
Afon Ffinnant FormationOrdovician
Allt Ddu FormationOrdovician
Aran Volcanic Group/Llyn y Gafr FormationOrdovician
Bala Group/Rhiwlas FormationOrdovician
Black Rock LimestoneCarboniferous
Blaencediw FormationOrdovician
Bod Deiniol FormationOrdovician
Bodeidda MudstoneOrdovician
Bronydd FormationSilurian
Bryn Siltstone FormationOrdovician
Builth VolcanicOrdovician
Camnant MudstoneOrdovician
Carmarthen FormationOrdovician
Carmarthen Group/Afon Ffinnant FormationOrdovician
Carnedd Iago FormationOrdovician
Crychan FormationSilurian
Cwm Felin Boeth FormationOrdovician
Cymerig LimestoneOrdovician
CyrnFormationOrdovician
Dolhir FormationOrdovician
Dyserth Quarry LimestoneCarboniferous
Elton BedsSilurian
Ffestiniog Flag FormationCambrian
Ffestiniog FlagsCambrian
Foel FormationCarboniferous
GelliFormationOrdovician
Glyn FormationOrdovician
Glyn Gower FormationOrdovician
GraigFormationOrdovician
Gronant FormationCarboniferous
Haverford FormationOrdovician
Haverford MudstoneSilurian
Hells Mouth GritsCambrian
High Tor LimestoneCarboniferous
Hirnant LimestoneOrdovician
Hope ShaleOrdovician
Hughley ShaleSilurian
Hunts Bay Oolite FormationCarboniferous
Leete LimestoneCarboniferous
Llanarmon LimestoneCarboniferous
Llandudno Pier Dolomite FormationCarboniferous
Llanelly FormationCarboniferous
Llanfallteg FormationOrdovician
Llanfawr MudstoneOrdovician
Llwyn FormationCarboniferous
Lower Flaxley BedsSilurian
Lower Longhope BedsSilurian
Lower Old Red Sandstone Group/Downtonian FormationSilurian
Ludlow Series Group/Whitcliffe FormationSilurian
Mawddach Group/DolFormationOrdovician
May Hill Sandstone FormationSilurian
Mercia MudstoneTriassic
Middle Elton FormationSilurian
Milford Haven FormationSilurian
Moel Hiraddug LimestoneCarboniferous
Nant Ffrancon FormationOrdovician
Nant Hir FormationOrdovician
Nant Hir Group/Derfel LimestoneOrdovician
Ogof Hen FormationOrdovician
Onny ShaleOrdovician
PenFormationSilurian
Plas Uchaf FormationOrdovician
Pont y Fenni FormationOrdovician
Pontyfenni FormationOrdovician
Quartz ConglomerateDevonian
Senni bed FormationDevonian
Senni BedsDevonian
Sholeshook LimestoneOrdovician
Slade and Redhill MudstoneOrdovician
Spring Quarry LimestoneCarboniferous
St. Maughan's FormationDevonian
Sully BedsTriassic
Sutton FormationJurassic
Sutton stone FormationJurassic
Trefawr FormationSilurian
Treiorwerth FormationOrdovician
TyFormationSilurian
Upper Blaisdon BedsSilurian
Upper Flaxley BedsSilurian
Upper Longhope BedsSilurian
Wenallt FormationOrdovician
Wenlock ShaleSilurian
Wilsonia Shales FormationSilurian
Woolhope LimestoneSilurian

See also

References
  • Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
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