| Group or Formation
|
Period
|
Notes
|
| Alston Group / Knipe Scar Limestone |
Carboniferous |
|
| Alston Group / Potts Beck Limestone |
Carboniferous |
|
| Ampthill Clay |
Jurassic |
|
| Ancholme Group / Kimmeridge Clay |
Jurassic |
|
| Ancholme Group / Oxford Clay |
Jurassic |
|
| Ashfell Limestone |
Carboniferous |
|
| Aymestry Limestone Formation |
Silurian |
|
| Baggy Sandstones Formation |
Devonian |
|
| Bala Group / Chatwell Flags Formation |
Ordovician |
|
| Barton Formation |
Palaeogene |
|
| Barton Beds |
Palaeogene |
|
| Barton Clay |
Palaeogene |
|
| Bee Low Limestones |
Carboniferous |
|
| Belemnite Marls |
Jurassic |
|
| Bembridge Limestone |
Palaeogene |
|
| Bembridge Marls |
Palaeogene |
|
| Bentham Grit |
Carboniferous |
|
| Berkshire Oolite Formation |
Jurassic |
|
| Black Rock Formation |
Carboniferous |
|
| Blackdown Greensand Formation |
Cretaceous |
|
| Blackheath Beds |
Palaeogene |
|
| Blue Lias Formation |
Jurassic |
|
| Bracklesham Formation |
Palaeogene |
|
| Bracklesham Beds |
Palaeogene |
|
| Bracklesham Group / Earnley Formation |
Palaeogene |
|
| Bracklesham Group / Elmore Formation |
Palaeogene |
|
| Bracklesham Group / Marsh Farm Formation |
Palaeogene |
|
| Bracklesham Group / Selsey Formation |
Palaeogene |
|
| Bracklesham Group / Wittering Formation |
Palaeogene |
|
| Bringewood Beds |
Silurian |
|
| Brockenhurst Beds |
Palaeogene |
|
| Bromsgrove Sandstone |
Triassic |
|
| Burwell Rock Formation |
Cretaceous |
|
| Calcareous Grit |
Jurassic |
|
| Carboniferous Limestone |
Carboniferous |
|
| Carmarthen Formation |
Ordovician |
|
| Carstone Formation |
Cretaceous |
|
| Caton Shales |
Carboniferous |
|
| Cauldon Low Conglomerate Formation |
Carboniferous |
|
| Cauldon Low Limestone |
Carboniferous |
|
| Cementstone Formation |
Carboniferous |
|
| Chalk Formation |
Cretaceous |
|
| Chalk Marl Formation |
Cretaceous |
|
| Chalk Group / "Upper Chalk" Formation |
Cretaceous |
|
| Chalk Group / Lower Chalk Formation |
Cretaceous |
|
| Chalk Group / Lower Formation |
Cretaceous |
|
| Charmouth Mudstone Formation |
Jurassic |
|
| Chee Tor Limestone |
Carboniferous |
|
| Cheney Longville Formation |
Ordovician |
|
| Chillesford Clay |
Quaternary |
|
| Claxby Ironstone Formation |
Cretaceous |
|
| Clifton Down Limestone |
Carboniferous |
|
| Cockhill Marine Band |
Carboniferous |
|
| Colsterdale Marine Beds |
Carboniferous |
|
| Coral Rag Formation |
Jurassic |
|
| Corallian Oolite Formation |
Jurassic |
|
| Corallian Group / Coral Rag Formation |
Jurassic |
|
| Corallian Group / Kingston Formation |
Jurassic |
|
| Coralline Crag Formation |
Neogene |
|
| Coralline Oolite Formation |
Jurassic |
|
| Cornbrash Formation |
Jurassic |
|
| Cotswold Slate Formation |
Jurassic |
|
| Crag Group / Norwich Crag Formation |
Quaternary |
|
| Crag Group / Weybourne Crag Formation |
|
|
| Creechbarrow Limestone |
Palaeogene |
|
| Cromer Forest Bed Formation |
|
|
| Cromer Knoll Formation |
|
|
| Cromer Knoll Group / Spilsby Sandstone |
Cretaceous |
|
| Crossdale Shales |
Carboniferous |
|
| Crugan Mudstone Formation |
Ordovician |
|
| Dartmouth Beds |
Devonian |
|
| Denbury Crinoidal Limestone |
Devonian |
|
| Dent Group / Keisley Limestone |
Ordovician |
|
| Ditton Formation |
Devonian |
|
| Downton Castle Sandstone |
Silurian |
|
| Downton Sandstone |
Silurian |
|
| Downton Group / Downton Castle Sandstone |
Silurian |
|
| Downton Group / Rushall Formation |
Silurian |
|
| Dufton Shales |
Ordovician |
|
| Durlston Formation |
Cretaceous |
|
| Duyfor Mudstone |
Ordovician |
|
| East Ogwell Limestone |
Devonian |
|
| Eggardon Grit |
Cretaceous |
|
| Elton Beds |
Silurian |
|
| Eyam Limestone |
Carboniferous |
|
| Eyam Limestones Formation |
Carboniferous |
|
| Farne Group / Scremerston Formation |
Carboniferous |
|
| Forest Bed Formation |
|
|
| Forest Hollow Beds |
Carboniferous |
|
| Forest Marble Formation |
Jurassic |
|
| Frome Clay |
Jurassic |
|
| Fuller's Earth Formation |
Jurassic |
|
| Gault Formation |
Cretaceous |
|
| Glauconitic Marl Formation |
Cretaceous |
|
| Great Oolite Formation |
Jurassic |
|
| Great Oolite Group / Bath Oolite Formation |
Jurassic |
|
| Great Oolite Group / Chipping Norton Limestone |
Jurassic |
|
| Great Oolite Group / Cornbrash Formation |
Jurassic |
|
| Great Oolite Group / Forest Marble Formation |
Jurassic |
|
| Great Oolite Group / Hampen Marly Formation |
Jurassic |
|
| Great Oolite Group / Sharp's Hill Formation |
Jurassic |
|
| Great Oolite Group / Taynton Limestone |
Jurassic |
|
| Great Oolite Group / White Limestone |
Jurassic |
|
| Great Scar Limestone Group / Ashfell Formation |
Carboniferous |
|
| Great Scar Limestone Group / Danny Bridge Formation |
Carboniferous |
|
| Greta Grit |
Carboniferous |
|
| Habberley Shale |
Ordovician |
|
| Hambleton Oolite Formation |
Jurassic |
|
| Hampen Marly Formation |
Jurassic |
|
| Hartshill Formation |
Cambrian |
|
| Harwich Formation |
Palaeogene |
|
| Hastings Formation |
Cretaceous |
|
| Hastings Beds |
Cretaceous |
|
| Hastings Beds Group / Wadhurst Clay |
Cretaceous |
|
| Hastings Group / Grinstead Clay |
Cretaceous |
|
| Headon Formation |
Palaeogene |
|
| Headon Hill Formation |
Palaeogene |
|
| Hempstead Formation |
Palaeogene |
|
| Hilton Plant Beds |
Permian |
|
| Holderness Formation |
|
|
| Hope Shale |
Ordovician |
|
| Hopedale Limestones Formation |
Carboniferous |
|
| Hotwells Formation |
Carboniferous |
|
| Inferior Oolite Formation |
Jurassic |
|
| Inferior Oolite Group / Chipping Norton Limestone |
Jurassic |
|
| Inferior Oolite Group / Middle Inferior Oolite Formation |
Jurassic |
|
| Inferior Oolite Group / Northampton Sands |
Jurassic |
|
| Inferior Oolite Group / Upper Inferior Oolite Formation |
Jurassic |
|
| Infracombe Slates Group / Combe Martin Slates Formation |
Devonian |
|
| Insect Bed Formation |
Triassic |
|
| Iron Sands |
Jurassic |
|
| Junction Bed Formation |
Jurassic |
|
| Keisley Formation |
Ordovician |
|
| Kimmeridge Clay |
Jurassic |
|
| Kimmeridge Formation |
Jurassic |
|
| Kirkby Moor Flags Formation |
Silurian |
|
| Ledbury Formation |
Silurian |
|
| Leintwardine Formation |
Silurian |
|
| Leintwardine Beds |
Silurian |
|
| Lias Formation |
Jurassic, Triassic |
|
| Lias Group / Beacon Limestone Formation |
Jurassic |
|
| Lias Group / Blue Lias Formation |
Jurassic, Triassic |
|
| Lias Group / Charmouth Mudstone Formation |
Jurassic |
|
| Lias Group / Dyrham Formation |
Jurassic |
|
| Lias Group / Marlstone Rock Formation |
Jurassic |
|
| Lias Group / Scunthorpe Mudstone Formation |
Triassic |
|
| Lias Group / Whitby Mudstone Formation |
Jurassic |
|
| Lincolnshire Limestone |
Jurassic |
|
| Llanfallteg Formation |
Ordovician |
|
| London Clay |
Palaeogene |
|
| Lower Borland Shales |
Carboniferous |
|
| Lower Calcareous Grit |
Jurassic |
|
| Lower Chalk Formation |
Cretaceous |
|
| Lower Chalk Group / Abbott's Cliff Formation |
Cretaceous |
|
| Lower Chalk Group / Cambridge Greensand Formation |
Cretaceous |
|
| Lower Chalk Group / Chalk Marl Formation |
Cretaceous |
|
| Lower Comley Formation |
Cambrian |
|
| Lower Ditton Formation |
Devonian |
|
| Lower Greensand Formation |
Cretaceous |
|
| Lower Greensand Group / Atherfield Clay |
Cretaceous |
|
| Lower Greensand Group / Faringdon Sand Formation |
Cretaceous |
|
| Lower Greensand Group / Ferruginous Sands |
Cretaceous |
|
| Lower Greensand Group / Folkestone Formation |
Cretaceous |
|
| Lower Greensand Group / Hythe Formation |
Cretaceous |
|
| Lower Greensand Group / Sandgate Formation |
Cretaceous |
|
| Lower Greensand Group / Woburn Sand Formation |
Cretaceous |
|
| Lower Hamstead Beds |
Palaeogene |
|
| Lower Headon Beds |
Palaeogene |
|
| Lower Limestone Group / Great Scar Limestone |
Carboniferous |
|
| Lower Marl Formation |
Permian |
|
| Ludlow Formation |
Silurian |
|
| Lulworth Formation |
Cretaceous |
|
| Lynton Slates Formation |
Devonian |
|
| Magnesian Conglomerate Formation |
Triassic |
|
| Malton Oolite Formation |
Jurassic |
|
| Mammaliferous Crag Formation |
|
|
| Marl Slate Formation |
Permian |
|
| Mercia Mudstone Group / Blue Anchor Formation |
Triassic |
|
| Mercia Mudstone Group / Keuper Waterstones Formation |
Triassic |
|
| Mercia Mudstone Group / Tarporley Siltstone Formation |
Triassic |
|
| Merevale Shales |
Ordovician |
|
| Middle Calcareous Grit |
Jurassic |
|
| Middle Chalk Formation |
Cretaceous |
|
| Middle Headon Beds |
Palaeogene |
|
| Middle Inferior Oolite Formation |
Jurassic |
|
| Middle Limestone Group / Five Yard Limestone VI Formation |
Carboniferous |
|
| Middle Limestone Group / Five Yard Limestone VI Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Five Yard Limestone VIa Formation |
Carboniferous |
|
| Middle Limestone Group / Five Yard Limestone VIa Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Five Yard Limestone VIb Formation |
Carboniferous |
|
| Middle Limestone Group / Gayle Limestone Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Gayle Limestone II Formation |
Carboniferous |
|
| Middle Limestone Group / Gayle Shale |
Carboniferous |
|
| Middle Limestone Group / Hardrow Scar Limestone III Formation |
Carboniferous |
|
| Middle Limestone Group / Hardrow Scar Limestone III Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Hardrow Scar Limestone IIIa Formation |
Carboniferous |
|
| Middle Limestone Group / Hardrow Scar Limestone IIIb Formation |
Carboniferous |
|
| Middle Limestone Group / Hardrow Scar Limestone IIIc Formation |
Carboniferous |
|
| Middle Limestone Group / Hawes Limestone I Formation |
Carboniferous |
|
| Middle Limestone Group / Middle Limestone V Formation |
Carboniferous |
|
| Middle Limestone Group / Middle Limestone V Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Middle Limestone Va Formation |
Carboniferous |
|
| Middle Limestone Group / Middle Limestone Va Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IV Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IV Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IVa Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IVa Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IVb Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IVb Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IVc Formation |
Carboniferous |
|
| Middle Limestone Group / Simonstone Limestone IVc Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Three Yard Limestone VII Formation |
Carboniferous |
|
| Middle Limestone Group / Three Yard Limestone VII Cyclothem Formation |
Carboniferous |
|
| Middle Limestone Group / Underset Limestone VIII Formation |
Carboniferous |
|
| Milldale Limestone |
Carboniferous |
|
| Monsal Dale Limestones Formation |
Carboniferous |
|
| Much Wenlock Formation |
Silurian |
|
| Mytton Flag Formation |
Ordovician |
|
| Mytton Flags and Tankerville Formation |
Ordovician |
|
| Namurian Series Formation |
Carboniferous |
|
| Norwich Crag Formation |
Quaternary |
|
| Nothe Grits Formation |
Jurassic |
|
| Ogof Hen Formation |
Ordovician |
|
| Oldhaven Formation |
Palaeogene |
|
| Oldhaven Beds |
Palaeogene |
|
| Osborne Beds |
Palaeogene |
|
| Osgodby Formation |
Jurassic |
|
| Osmington Oolite Formation |
Jurassic |
|
| Overton Formation |
Silurian |
|
| Oxford Clay |
Jurassic |
|
| Parrot Coal Formation |
Carboniferous |
|
| Passage Beds |
Jurassic |
|
| Penarth Group / Lilstock Formation |
Triassic |
|
| Penarth Group / Westbury Formation |
Triassic |
|
| Penarth Group / White Lias Formation |
Jurassic, Triassic |
|
| Pendle Grit |
Carboniferous |
|
| Penarth Group / Cotham Formation |
Triassic |
|
| Penarth Group / Westbury Formation |
Triassic |
|
| Petherwin Group / Baggy Formation |
Devonian |
|
| Pilton Formation |
Devonian |
|
| Pilton Shales |
Carboniferous, Devonian |
|
| Pontyfenni Formation |
Ordovician |
|
| Portland Formation |
Jurassic |
|
| Portland Oolite Formation |
Jurassic |
|
| Portland Group / Portland Stone Formation |
Jurassic |
|
| Purbeck Formation |
Cretaceous, Jurassic |
|
| Purbeck Group / Durlston Formation |
Cretaceous |
|
| Purbeck Group / Lulworth Formation |
Cretaceous, Jurassic |
|
| Ravenscar Formation |
Jurassic |
|
| Ravenscar Group / Cloughton Formation |
Jurassic |
|
| Ravenscar Group / Eller Beck Formation |
Jurassic |
|
| Ravenscar Group / Lower Saltwick Formation |
Jurassic |
|
| Ravenscar Group / Saltwick Formation |
Jurassic |
|
| Ravenscar Group / Scalby Formation |
Jurassic |
|
| Ravenscar Group / Scarborough Formation |
Jurassic |
|
| Reading Beds |
Palaeogene |
|
| Red Crag Formation |
Neogene |
|
| Ringstead Coral Bed Formation |
Jurassic |
|
| Roeburndale Formation |
Carboniferous |
|
| Rutland Formation |
Jurassic |
|
| Sabden Shale |
Carboniferous |
|
| Saltwick Formation |
Jurassic |
|
| Sandringham Sands |
Jurassic |
|
| Sandringham Sandstone |
Cretaceous |
|
| Sandsfoot Grit |
Jurassic |
|
| Selborne Group / Gault Formation |
Cretaceous |
|
| Selborne Group / Upper Greensand Formation |
Cretaceous |
|
| Selsey Formation |
Palaeogene |
|
| Sharp's Hill Formation |
Jurassic |
|
| Sherwood Sandstone Group / Bromsgrove Sandstone |
Triassic |
|
| Sherwood Sandstone Group / Otter Sandstone Formation |
Triassic |
|
| Shunner Fell Formation |
Carboniferous |
|
| Skegness Clay |
Cretaceous |
|
| Solenopora Beds |
Carboniferous |
|
| Solent Group / Bouldnor Formation |
Palaeogene |
|
| Speeton Clay |
Cretaceous |
|
| Spilsby Sandstone |
Cretaceous, Jurassic |
|
| Stanford Formation |
Jurassic |
|
| Stockdale Shales |
Silurian |
|
| Suffolk Pebble Beds |
Palaeogene |
|
| Tamar Group / Torquay Formation |
Devonian |
|
| Tankerville Formation |
Ordovician |
|
| Tarnbrook Wyre Marine Beds |
Carboniferous |
|
| Temeside Shale |
Silurian |
|
| Thanet Formation |
Palaeogene |
|
| Blue Lias Formation |
Jurassic |
|
| Torquay Limestone |
Devonian |
|
| Trigonia clavellata Formation |
Jurassic |
|
| Upnor Formation |
Palaeogene |
|
| Upper Border Formation |
Carboniferous |
|
| Upper Bowland Shales |
Carboniferous |
|
| Upper Calcareous Grit |
Jurassic |
|
| Upper Chalk Formation |
Cretaceous |
|
| Upper Coal Measures Formation |
Carboniferous |
|
| Upper Comley Formation |
Cambrian |
|
| Upper Greensand Formation |
Cretaceous |
|
| Upper Headon Beds |
Palaeogene |
|
| Upper Limestone Group / Main Limestone IX Formation |
Carboniferous |
|
| Upper Ludlow Formation |
Silurian |
|
| Urswick Limestone |
Carboniferous |
|
| Warwickshire Group / Kenilworth Sandstone |
Permian |
|
| Waterhouses Limestone |
Carboniferous |
|
| Weald Clay |
Cretaceous |
|
| Weald Clay Group / Lower Weald Clay |
Cretaceous |
|
| Weald Clay Group / Upper Weald Clay |
Cretaceous |
|
| Wealden Formation |
Cretaceous |
|
| Wealden Group / Ashdown Formation |
Cretaceous |
|
| Wealden Group / Tunbridge Wells Sand Formation |
Cretaceous |
|
| Wealden Group / Vectis Formation |
Cretaceous |
|
| Wealden Group / Wadhurst Clay |
Cretaceous |
|
| Wealden Group / Weald Formation |
Cretaceous |
|
| Wealden Group / Weald Clay |
Cretaceous |
|
| Wealden Group / Wessex Formation |
Cretaceous |
|
| Weaver Beds |
Carboniferous |
|
| Wenlock Formation |
Silurian |
|
| Wenlock Shale |
Silurian |
|
| Wessex Formation |
Cretaceous |
|
| Westbury Formation |
Triassic |
|
| Westbury Shales |
Triassic |
|
| Weston Flags Formation |
Ordovician |
|
| Weybourne Crag Formation |
|
|
| Whitby Mudstone Formation |
Jurassic |
|
| Whitcliffe Formation |
Silurian |
|
| Whitcliffe Beds |
Silurian |
|
| White Chalk Formation |
Cretaceous |
|
| White Limestone |
Jurassic |
|
| Wittering Formation |
Palaeogene |
|
| Woolwich & Reading Beds |
Palaeogene |
|
| Woolwich and Reading Formation |
Palaeogene |
|
| Wych Beds |
Silurian |
|
| Yeovil Sands |
Jurassic |
|
| Yoredale Group / Alston Formation |
Carboniferous |
|
| Zechstein Group / Marl Slate Formation |
Permian |
|
