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A TOUR OF THE STONE SLATE REGIONS

Introduction: Stone-slate geology Stratigraphy Rocks and climate Map Cretaceous - Wealden Jurassic Permian and Triassic Carboniferous Devonian - Old Red Sandstone Silurian - Pridoli: The Tilestones Ordovician

These two tables illustrate the position of some tilestones within the geological succession. It is not a exhaustive list. It does not, for example, include siltstones or 'shales' which fall between sedimentary and metamorphic slates.

In the Carboniferous there are too many historical production locations to be listed in the table.

The colours in the table match those in the MAP as closely as possible but because white text over dark backgrounds does not always print some backgrounds are lighter or different colours.

Table 1: Some sources of tilestones in the Paleozoic and Mesozoic sedimentary rocks PERIOD GEOLOGICAL UNIT TILESTONE NAME or LOCATION Cretaceous Chalk including Red Chalk - Upper Greensand and Gault - Lower Greensand - Weald Clay - Hastings Beds Sussex:Horsham Stone Sussex : Charlwood Slate - Cyrena Limestone Jurassic: Upper Purbeck Dorset: Isles of Purbeck and Portland,  Wiltshire: Vale of Wardour, Swindon - Portland - Ampthill and Kimmeridge -- Corallian Dorset: Gillingham  Oxfordshire: Buckland Warren (Pusey Slates) Jurassic: Middle - Inferior and Great Oolite Oxford Clay and Kellaway Beds Cornbrash Dorset, Somerset, Wiltshire, Gloucestershire, Oxford Forest Marble Dorset: Fleet,  Somerset: Bothenhampton nr Bridport, Longburton and Yetminster nr Sherborne,  Wiltshire: Bradford on Avon, Atworth, Poulton, Neston Park, Vale of Wardour Gloucestershire:  Down Ampney, Tetbury, Chevenage, Burford to Lechlade White limestone including Hampen Marly Beds Cheltenham to Cirencester Taynton Stone in North Burford to Enstone (Fulwell slates) Soundborough Trougham Tilestone Formation in South Througham (Bisley Flats) Sharps Hill Beds Shipton under Wychwood Stonesfield slates Stonesfield Fuller's Earth including the Eyford Member Andoverford to Lower Slaughter, Windrush Valley, Soundborough, Brockhill, Sevenhampton Common, Chalk Hill, Stow on the Wold Chipping Norton Limestone  Moreton in Marsh - Inferior Oolite Gloucestershire: Snowhill, Kineton - Northampton Sand Duston, Harlestone Heath, Pitsford, Weston-Favell East Midlands  Blisworth Limestone Oundle, Blisworth, Yardley Chase Rutland Formation Pytchley, Hopping Hill near Duston, Helmdon? near Banbury Lincolnshire limestone Formation Collyweston, Easton on the Hill, Kirby Lodge, Duddington Grantham Formation Northampton Sand Formation Duston, Harleston, Pitsford, Weston Favell Yorkshire Scarborough Grey or Limstone  Brandsby Boltby slate Hambleton Hills Jurassic: Lower Upper Lias Somerset: Ham Hill, - Middle Lias Northants: Chacombe - Lower Lias Dorset: Queen Camel Permian and Triassic:  Triassic Mudstones Also see Grinshill Permian and Triassic Sandstones. New Red Sandstone Cumbria:Eden Valley Dumfries and Galloway: Llocharbriggs and Llochmaben. - Budleigh Salterton Pebble Beds - Permian Mudstones - Magnesian Limestones Derbyshire: Whitwell - Permian Basal Breccias, sandstones and mudstones Carboniferous: Silesian Westphalian and Stephanian, Barren Red lithology - Upper Westphalian Pennant Measures S Wales: Llangadog, Pontardawe  Gloucestershire: Forest of Dean  Avon: Bristol - Lower Westphalian  Productive Coal Measures Parts of North Derbyshire, East Cheshire, Lancashire, Yorkshire, Co Durham, Cumbria and Northumberland. - Namurian Millstone Grit Parts of North Derbyshire, East Cheshire, Lancashire, Yorkshire, Co Durham, Cumbria and Northumberland. Carboniferous: Dinantian Tournasian and Visean  Carboniferous Limestone Series - Basal Conglomerate Devonian Upper Devonian and Upper Old Red Sandstone - Limestone - Middle Devonian / Mid Old Red Sandstone Caithness: Thurso  Orkney and Shetland. - Lower Devonian - Lower Old Red Sandstone  Hereford: Llanveynoe, Garnons and Dinmore Hills.  Tayside: Carmylie.  Silurian Pridoli Welsh Marches: Downton Castle.  S Wales: Llandeilo to Llandovery. - Ludlow - Wenlock - Llandovery Ordovician Ashgill -- Caradoc Shropshire: Acton Burnell, Cheney Longville. - Llandeilo - Llanvirn and Arenig Cambrian Upper Including Tremadoc - Middle - Lower Precambrian Rocks of Anglesey, Lleyn Peninsula, Charnwood and Longmynd

Table 2: Tilestones in Igneous and Metamorphic Rocks Igneous Intrusive Diorite . Powys: Corndon Hill* Metamorphic Dalradian - Moine Mica-schist Strathclyde: Ross of Mull - Lewisian . *The attribution of the Corndon Hill stone slate as igneous is now known to be wrong. It is in fact a very fine, laminated siliceous sandstone. More details here.

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