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Home , Alston Formation, Balder Formation, Balnakeil, Clachtoll, Coal Measures, Colsay

STRATIGRAPHICAL CHART OF THE : NORTHERN BRITAIN

1 2 3 4 5 6 7 8 9 10 11 12 BGS Geological Time Chart North-west Approaches/ Northern Northern Highlands Western Isles & Grampian Midland Valley Central North Sea South of Northern & Northern Hebrides Shelf Inner Hebrides Highlands of Scotland northern Irish Sea Eon Era / /Age age (Ma) Period Epoch / Sub-era 0.01 Holocene Late 0.13 Ulster Glacigenic Caledonia Glacigenic Caledonia Glacigenic Group Caledonia Glacigenic Group Caledonia Glacigenic Group Caledonia Glacigenic Group Caledonia Glacigenic Group Group Caledonia Glacigenic Group Caledonia Glacigenic Group Britannia Britannia Britannia Britannia Britannia Britannia Britannia Britannia British Coastal British Coastal Catchments British Coastal British Coastal British Coastal British Coastal Benburb Group British Coastal British Coastal Catchments Catchments Catchments Catchments Catchments Catchments Catchments Mid Deposits Group Group Deposits Group Group Deposits Group Deposits Group Group Deposits Group Group Deposits Group Deposits Group Deposits Group Group Albion Group Albion Group Albion Group Albion Glacigenic Group Glacigenic Group Glacigenic Group Glacigenic Group The Geological Society 0.78 Pleistocene*

nary Nordland Early Group Quater

Scale: 1 cm = 0.5 Ma Compiled by C N Waters 1.8 Nordland Nordland Group Group Cartography by P Lappage

L Gelasian Pliocene Residual Buchan Deposits Gravels Formation Piacenzian 2.6 Group 3.6 E Zanclean 5.3 BGS contributors: Messinian 7.2 L Tortonian Britannia M C Akhurst, C A Auton, R P Barnes, A J M Barron, M A E Browne, M T Dean, J D Floyd, M R Gillespie, 11.6 Brassington Cenozoic Serravallian Catchments Miocene M Langhian 13.6 Formation P M Hopson, M Krabbendam, A G Leslie, A A McMillan, D Millward, W I Mitchell, K Smith, D Stephenson,

Neogene 16.0 Group P Stone, and C N Waters. Burdigalian ALPINE ALPINE ALPINE ALPINE E 20.4 Westray Aquitanian Westray Westray 23.0 Group Lark Lark Group Skade Group Skade Ballymoney Formation L Chattian Formation Formation Lough Neagh Gp Dunaghy Formation Oligocene 28.4 Fm Fm E This chart is produced in collaboration with the Geological Society Stratigraphy Commission.

ertiary 33.9 The membership of the Commission includes the following: T L Priabonian 37.2 Castle Eden Fissure-fill 40.4 M Stronsay Stronsay Horda Stronsay Horda Formation Group Group Formation Group Formation Lutetian Mousa J A Zalasiewicz1, T L Barry2, P R Bown3, P J Brenchley4, A Coe2, J C W Cope5,

Palaeogene Fm Fm 48.6 Balder Balder Balder Formation Formation Formation A S Gale6,7, P L Gibbard8, F J Gregory7, 9 , M W Hounslow10, A Kerr11 , R W O’B Knox12, E Cleveland & Acklington dykes Moray Group Moray Group 13 14 11 12 3,15 16 55.8 Moray Group Flett Formation Colsay Sst Sele Fm Dornoch Fm Sele Fm Dornoch Fm Upper Basalt Formation 55.9±0.9 J E A Marshall , M Oates , P Pearson , J H Powell , P F Rawson , A G Smith , L Thanetian 58.7 Faroe Lamba Formation Kettla Fm Montrose Lista Formation Montrose Lista Formation Antrim Lava Carlingford Complex P Stone12, C N Waters12, M Williams1 Selandian 58.9±0.1 Group Interbasaltic Formation M 61.7 Group Formation Group Maureen Formation Skye Lava and Group Maureen Formation ^ ^ ^ 61.4±0.8 Paleocene Mull Lava gps Lower Basalt Formation E Danian Fm Ekofisk Formation Ekofisk Formation 65.5 Ockran Sst Fm Beinn Iadain Mudstone Tor Formation Maastrichtian Jorsalfare Jorsalfare Formation 1 Dept. of , University of Leicester 70.6 Formation Formation Ulster 2 Dept. of Earth Sciences, The Open University Group White 3 Dept. of Earth Sciences, University College London Campanian Strathaird Limestone Chalk Group Mackerel Flounder Formation Shetland Formation Formation Formation Kyrre Kyrre 4 Dept. of Earth Sciences, University of Liverpool Late Group Feorlin Sst Fm 83.5 Formation Santonian Formation 5 Dept. of Geology, National Museum of 85.8 Gribun Chalk Formation Coniacian Coire Riabhach Hibernian 6 School of Earth and Environmental Sciences, University of Portsmouth 89.3 Phosphatic Fm Lochaline White not named Turonian Herring Fm Macbeth Fm Macbeth Formation Inner Hebrides Herring Formation Greensands 93.5 Inner Hebrides Group Fm 7 Dept. of Palaeontology, Natural History Museum Group Chalk Hidra Svarte Chalk Hidra Svarte Hidra 8 Dept. of Geography, University of Cambridge Cenomanian Formation Fm not named Group Group Formation Formation Morvern Greensand Formation Formation Formation 99.6 9 PetroStrat Ltd Commodore Rødby Rødby Formation Cruiser Formation Formation 10 Centre for Environmental Magnetism and Paleomagnetism, Lancaster University Albian Formation

etaceous 11 School of Earth, Ocean & Planetary Sciences, University Royal Carrack Carrack Cr Sovereign Formation 12 British Geological Survey 112.0 Formation Formation Cromer Victory Cromer 13 Southampton Oceanography Centre, University of Southampton Knoll Formation Britannia Aptian Group 14 BG Group plc Knoll Cromer Wick Sst Fm Early Moreseat Sst Neptune Knoll 15 Scarborough Centre for Coastal Studies, University of Hull 125.0 Group Valhall Cromer Knoll Sandstone Fm Formation Formation Group Group Barremian Formation Valhall 16 Dept. of Earth Sciences, University of Cambridge 130.0 Formation Hauterivian 136.4 Valanginian 140.2 Berriasian 145.5 Kimmeridge The study was funded by the British Geological Survey and is published Tithonian Kimmeridge Clay Kimmeridge Clay Clay with the permission of the Executive Director, British Geological Survey. Formation Formation 150.8 Rona Formation Helmsdale Boulder Beds Humber Late Kimmeridgian Formation Group Fulmar Formation Humber Fm 155.7 Humber Piper Formation Group Fm Bibliographical reference:Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, Group Clynekirkton Heather Oxfordian Group Staffin Shale Formation Fm Heather Balintore Sandstone Fm Beatrice Fm D, Mitchell, W I, McMillan, A A,Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, 161.2 Heather Fm Great Estuarine Callovian Formation Strathsteven Mst Fm Fladen Mesozoic 164.7 Formation Group Staffin Bay Formation M A E, Stephenson, D, Akhurst, M C, andBarnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Bathonian Hugin Fm Brora Coal Formation Group Brora Coal 167.7 Tarbert Fm Formation Pentland Brent Fladen Ness Fm Northern Britain. British Geological Survey, 1 poster. Mid Bajocian Etive Fm Pentland Formation 171.6 Group Group Rannoch Fm Formation Bearreraig Sandstone Fm Aalenian Broom Fm 175.6 Drake © NERC. 2008. All rights reserved. Portree Shale & Formation Ironstone formations 183.0 Dunlin Cook Fm Orrin Fm Darwin Group Scalpay Sandstone Formation Burton Formation Dunrobin ISBN 978-0-7518-3562-5 Early Sule Skerry Formation Fm Lias Lady’s Pabay Shale Formation Bay 189.6 Skerry Stack Skerry Group Walk Fm Amundsen Sutherland Dunrobin Bay Group Fjerritslev Waterloo Group Formation Formation Sutherland Dunrobin Bay Mudstone Group Formation Ardnish Formation Mains Formation Banks Group Nansen Fm Group Formation Formation Lias Group Formation 196.5 Statfjord Breakish Formation Lias Group Lias Group 199.6 Formation Golspie Fm Penarth Group Westbury Fm Stotfield Penarth Group Lilstock & Westbury fms Calcrete Fm ^ ^ ^ Penarth Group Penarth Group 203.6 ^ ^ ^ Stotfield Stotfield Cherty Rock Derenenach Blue Anchor Formation Collin Glen Cherty Rock Formation Mudstone Formation Formation Formation Late New Red Levencorroch Port More Sandstone 216.5 Mudstone Formation Mercia Supergroup Mercia ^ ^ ^ Mercia Stornoway Formation Mercia Mudstone Formation Mudstone Mudstone Mudstone (g) Heron Cormorant Sandstone Heron Group Formation Lossie Group Knocksoghey Group Formation Lossiemouth Sandstone Group Skagerrak Papa Group Group -head Formation Formation Formation Formation (g) riassic 228.0 Group Fm T New Red New Red Stornoway Auchenhew Sandstone (h) Glenstaghey Formation Skagerrak Sandstone Formation Mudstone (h) Supergroup Formation Formation Supergroup Lagavarra Mid 237.0 ^ ^ ^ Craiganee Formation (h) Formation Lag a’ Bheith Derrycreevy Sandstone Formation ^ ^ ^ Sherwood Formation Ormskirk Sst Fm Sherwood St Bees Sherwood Ormskirk Sst Fm 245.0 Otter Bank & Burghead Sandstone Fm Sandstone Sandstone Smith Bank Hopeman Smith Bank Sandstone Sandstone St Bees Sandstone New Red Glen Dubh oup Milltown Conglomerate Calder Sandstone Fm Early Shoal High Hopeman Sandstone Sst Fm Sst Fm Formation Group Formation Group Formation Sandstone Sherwood Gr Formation Formation 249.7 formations Formation Group St Bees Sandstone Fm Sherwood Supergroup Lamlash Sst Sandstone 251.0 West Orkney Turbot Sandstone Turbot Manchester Bosies (g) Zechstein Shearwater Salt (h,a) White Brae Mudstone Cumbrian PHANEROZOIC Zechstein Evaporite Fm (a,h) Anhydrite Formation 253.8 Bank Group Machrie Formation Anhydrite Fm Belfast Formation (h) Marls Group Solan Bank Group Halibut Carbonate Fm (d, a) Sst Fm Group Halibut Carbonate Formation Coast Group Formation Fm (d,a) Group Formation Wuchiapingian Kupferschiefer Fm Belfast Harbour Evaporite Fm Kupferschiefer Eden (d) Brockram Cumbrian 260.4 Formation Shales Appleby Formation Brodick oup Coast Eden Shales Formation Capitanian Rotliegendes Formation Auk Coast Rotliegendes Gr 265.8 Breccia Fraserburgh Group Group (g, a) Formation Cumbrian Guadalupian Wordian Group Formation Group Formation (a) 268.0 Auk Roadian 270.6 Formation Locharbriggs Sandstone Ballytober Sandstone Kungurian Formation Brockram Enler Formation 275.6 Fm Group Inver Volcanic oup Formation Appleby Artinskian Corrie Gr Penrith Sandstone

Permian Group Stewartry Sandstone oup Formation

Stewartry Formation Gr Cisuralian 284.4 Appleby Group Doweel Brockram Sakmarian Formation

Scale: 1 cm = 10 Ma Locations of lithostratigraphical columns Mauchline Rotliegendes Breccia 292.1±1.1 Formation Sandstone Group 294.6 Formation Nun Whin Sill Asselian Gp Inge Volcanics Fm 297.4±0.4 299.0 Volc Fm Mauchline Volcanic Formation 298.3±1.3 299 ± 3 Conybeare Gp Grensen Fm Gzhelian Steph- 302.4±1.2 Late 303.9 Canonbie Bridge Sst Fm Kasimovian anian + Eskbank Wood Fm Becklees Sst Fm 306.5 Scottish Scottish D Upper Flora Sandstone Slievebane & Coal ARISCAN ARISCAN ARISCAN ARISCAN Conybeare Warwickshire Gp UCM ARISCAN ARISCAN ARISCAN Warwickshire Gp Mid Moscovian West- Bolsovian Coal Measures Scottish Upper Coal Measures Scottish Upper Coal Measures not named Pennine Coal Pennine Lower Coal V V Scottish CM V Scottish Coal V V Measures groups V V phalian + Duckmantian Group Scottish CM Scottish Middle CM Group Lower Flora Sandstone Scottish Pennine Pennine UCM Measures Group Measures Formation Pennine Coal Pennine Upper Coal Measures Langsettian 311.7 Group Pennine MCM Measures Group Pennine Middle Coal Measures Yeadonian Measures Gp CM Gp CM Gp Early Bashkirian Marsdenian Scottish Lower CM Scottish Lower Westoe Coal Formation Scottish Pennine Pennine Lower Kinderscoutian Coal Measures Scottish Gp Rossendale Formation Alportian Passage Formation ^ ^ ^ MCM LCM Coal Measures Offshore regions Nam- 318.1 Passage Fm ^ ^ ^ LCM Chokierian Yoredale Stainmore Formation urian + Clackmannan Lackagh Sst & Gowlaun Shale Arnsbergian Upper Limestone Formation Upper Limestone Formation Passage Group Firth Coal Formation Bowland Shale Group Late Firth Coal Group Stainmore Briscloonagh Sandstone & Craven

ous Pendleian Limestone Coal Fm Leitrim Formation

Formation oup Dergvone Shale

Formation Limestone Coal Formation oup Formation Group (ungrouped) edale 326.4 Clackmannan Group Carraun Shale Formation (ungrouped) Lower Lst Fm Gr Scarlett Volc Mb or Brigantian Lower Limestone Fm Gr Bellavally Alston Formation Y Onshore regions Kirkwood Fm Lawmuir Formation Clackmannan Alston Group Tyne Knipe Scar Lst Fm Asbian Kilskeery Dartry Lst & Glenade Sst Fm Kirkwood Fm Formation Glencar Lst Meenymore Fm Balladoole Limestone Fm Potts Beck Lst Strathclyde 335±2 Enterkin Tyne Limestone Fm Great Scar Formation Hodderense Lst Fm Mid Visean Benbulben Shale Formation Great Scar Ashfell Lst Fm Holkerian Strathclyde Mst Fm Glencartholm Volc Knockrushen Fm Numbers relate to the 3 Carbonifer Clyde Plateau Volcanic Clyde Plateau Volcanic Fm Tyrone Limestone Group Mullaghmore Sst Fm Limestone Sandstone Group Formation Closeburn Kershopefoot Group Border Formation Ashfell Sst Fm Tayport Basalt Beds Group Group Breakyneck Scar Lst Arundian Tayport Border Lst Fm Bundoran Shale Formation Formation Group order of the columns Formation Fell Sandstone Fm Brownber Fm Scandal Beck Lst Formation Ballyshannon 1 Mississippian Chadian Group Lyne Formation Lst Fm Clogher Valley & Ballyness fms & Coldbeck Lst fms 345.3 Clyde Sandstone Fm BallaganLyne Shap Village Lst on the chart 2 Upper Inverclyde Ballagan Formation Upper Fm Fm Marsett Formation & Stone Gill Lst fms (g) Ballagan Formation Old Red Group Old Red Langness Early Tournaisian Birrenswark 352.5±1.4 Ravenstonedale oup Cottonshope clyde Group ^ ^ ^ Group clyde Gr oup Courceyan Group Conglomerate oup Volcanic Clair Buchan Kinnesswood Formation Volcanic Formation Formation Pinskey Gill Gr Formation Gr Formation Formation Kinnesswood Ravenstonedale Kinnesswood Inver

Buchan Inver Group Formation Formation 359.2 ^ ^ ^ Formation 360 Kelly Burn Fairlie Sandstone Formation Sst Fm Elgin Calcrete Stratheden Stratheden Dunnet Head Sandstone Skelmorlie Conglomerate Raveagh Sandstone Formation Formation Formation ^ ^ ^ Group Formation Group Forres (d) Shap Wells Late Eday Wemyss Bay Sandstone Gortfinbar Upper Sandstone Fintona Conglomerate Conglomerate 4 374.5 Group Formation Old 375±2 Northern Group Kingsteps Sandstone Group Formation & Red Mell Fell Formation Shanmaghery Sandstone Fm Hoy Sandstone 379±10 John o’ Groats Sandstone Sst Conglomerate Britain 6 Frasnian Formation Formation Kyle Mudstone Group formations 5 8 Eday Eday Marl and Kyle Group 385.3 Eday Flagstone Hillhead Sandstone Fm Kyle Limestone Group Middle Orcadia Inshes Flagstone Fm formations Inverness Leanach Sandstone Fm Givetian Formation Cheviot Caithness Old Red Strath Rory Flagstone Gp Sandstone Nairnside Sandstone Fm Volcanic

Devonian Mid 391.8 Formation Flagstone Gp Group Formation Group Daviot Conglomerate Cheviot Granite Pluton Cheviot 7 Eifelian Formation 395.9±3.8 Reston Newry Igneous Complex Yesnaby Qui Sst Fm granite Volcanic Palaeozoic 397.5 Group Formation Sandstone Harra Ebb White Hill 399±3 9 Sandstone Formation Sarclet Ulbster Sandstone Formation ACADIAN ACADIAN ACADIAN Struie ACADIAN ACADIAN ACADIAN Group Lower Dryden Flags Formation Strathmore Sandstone ACADIAN Formation Group Ousdale Arkose Formation Formation Old Red Quarry Hill Sandstone Fm Group Lower ACADIAN 403±3 Fintona ShanmullaghACADIAN Formation 12 Early Group Tillybrachty Sandstone Fm Old Red undifferentiated Reston 10 407.0 Auchencrow Burn Weardale Granite Pluton Southern Carlinden Shale Formation Group Group Cross Group ^ ^ ^ Sandstone Formation 399.7±4 Peel 11 411.2 Corbie’s Tongue Conglomerate Arbuthnott-Garvock Slieve Tedd Formation Sandstone Gp

Rhynie Group Group Britain Eyemouth Volcanic Formation Group

Crawton Volcanic Formation Group 416.0 415± 6 Lanark Dunnottar-Crawton Gp Great Conglomerate Formation Pridoli Kirkby Moor Formation 418.7 Monks Kendal 415-425 Dungavel Ludlow 421.3 Glencoe Volcanic Formation c. 421 Water Stonehaven Group Bannisdale Formation 422.9 Lornn Plateau Volcanic Fm c. 424 Group Group Group oup Coniston Gp Waterhead Glenbuck Dalby Group Niarbyl Formation Wray Castle, Coldwell, Wenlock 426.2 425 Riccarton Group gr Tranearth Gp 428.2 Group Group Birk Riggs & Brathay fms North Hawick Group Priesthill Hawick Browgill Formation Girvan Hagshaw Esk Group e Super Group Group Group Group Stockdale Llandovery 436.0 Little Gala

Aeronian SCANDIAN SCANDIAN Gala Group Group 439.0 River Skelgill Formation Glen Dessary Syenite Group Phyllite Group Swindale Fm

443.7 Moffat Windermer † Glenlee Shinnel Ennerdale, Eskdale & Ashgill Formation Group 456±5 Drummuck High Mains, South Threave, Lady Formation Shale Dent Ashgill 445.6 Subgroup Burn, Quarrel Hill & Auldthorns Moffat Formation Desert- Threlkeld Granite Plutons Cautley oup Group Mudstone Fm Whitehouse Shalloch, Mill, Myoch, Penwhapple, Shale Portpatrick Glenwhargen Group Leadhills Dufton Shale gr 450-452 Subgroup Three Mile & South Shore fms Formation Formation creat dmillan Supergroup Group Group Late Ardwell Ardwell Farm Formation Group Sst, Lincomb Tarns Tuff, CALEDONIAN CALEDONIAN CALEDONIAN CALEDONIAN CALEDONIAN CALEDONIAN CALEDONIAN Ar 455.8 CALEDONIAN Subgroup Balclatchie Formation CALEDONIAN CALEDONIAN CALEDONIAN CALEDONIAN † Leadhills Blackcraig Fm Seathwaite Fell Sandstone,

Benan Conglomerate Fm Metamorphic basement Super Galdenoch Fm Caradoc Kirkcolm Fm Volcanic Group Airy’Airy’ss Bridge TTuffuff (undifferentiated greenschists) & WhorWhorneysideneyside TTufff formations Sandbian Superstes Mudstone Fm Tappins Gp Barr Birker Fell Andesite Formation

GRAMPIAN Stinchar Limestone Fm Crawford 460.9 Group Kirkton Formation Confinis Formation Group Darriwilian Llanvirn † Kirkland Conglomerate Fm Crawford dovician Mid 468.1 AberdeenInsch Granite Pluton OPHIOLITE OBDUCTION Group Lady Port Formation Kirk Stile & Tarn Moor GRAMPIAN GRAMPIAN Durine Formation Dounans Limestone Formation formations Or Stage 3 470±1 470±9 Raven Gill Formation Creggan Moar & † 471.8 Tyrone Glen fms Arenig Manx LoweswaterGRAMPIAN Formation Volcanic Group Injebreck, Barrule, , Floian Croisaphuill Formation 476±14 Group Mull Hill & Creg Agneash fms OPHIOLITE 478.6 Strath Suardal Formation Border OBDUCTION & Glen Dhoo formations Skiddaw Hope Beck Formation Early Balnakeil Formation Complex Group OPHIOLITE † Group OBDUCTION Balcreuchan Watch Hill Formation Tremadocian Tremadoc Sangomore Formation Sangomore Formation North Esk & Durness Group Sailmhor Formation Sailmhor Formation Margie formations Bitter Beck Formation Stage 10 488.3 Group ~492.0 not named Stage 9 492±3 Eilean Dubh Furongian ~496.0 Formation Eilean Dubh Formation Stage 7 Paibian 501.0 501±12 Drumian ~503.0 Ghrudaidh Formation Ghrudaidh Formation Series 3 Stage 5 ~506.5 An t-Sron Formation ~510.0 OPHIOLITE An t-Sron Formation Stage 4 OBDUCTION Series 2 Stage 3 ~517.0 Ardvreck Ardvreck Keltie Water Eriboll Eriboll Sandstone Leny Lst ~521.0 Group Group Grit Fm

Cambrian Formation Formation Stage 2 Terreneuvian ~534.6 Fortunean 542.0 Metamorphic basement Londonderry Formation (undifferentiated schists and Southern Ben Ledi Grit Formation gneisses) with granites Highland

Group n Spilitic Fm oup Gr oup Highland Dunrossness Phyllitic Fm Souther gr Loch Avich Lavas / Ben Vuirich Granite Ballykelly Formation Green Beds Formation Clift Hills Phyllitic Formation Dalradian

590±2 Super Division oup Clift Hills Pitlochry Schist Formation Asta Spilitic Formation gr Tayvallich Volcanic Fm 600.0 Dungiven Limestone Fm 600.0 Tayvallich Slate & Limestone Fm 601±4 Laxfirth Limestone Formation Argyll Crinan Grit/Ben Lui Schist Fm Dart Formation Craignish Phyllite Fm Group Wadbister Ness Formation Easdale Slate Fm Glenelly Formation Ediacaran Jura Quartzite Fm gyll Group Ar Girlsta Limestone Formation Dalradian Super Bonahaven Dolomite Fm 630.0 Port Askaig Tillite Fm Lossit Limestone Fm LEGEND Scale: 1 cm = 20 Ma Nesbister Limestone Mullach Dubh Phyllite Fm Colla Firth Division Formation Lismore Limestone Fm Whiteness Dalradian Whiteness

Supergroup Cuil Bay Slate Formation Limestone Mb Appin Phyllite & Limestone Fm Symbols Abbreviations Appin Quartzite Fm Appin Group Weisdale Limestone Formation Ballachulish Lst & Slate fms Sedimentary environments Sedimentary i c Leven Schist Fm Scatsta Quartzitic Formation Loch Treig Schist & Quartzite Fm

o z Residual deposits Evaporites – halite (h), gypsum (g), Gp/gps Group(s) Inverlair / Gaick Psammite Fm Scatsta Division anhydrite (a), dolomite (d) Clachaig Semipelite & Psammite o t e r Creag Meagaidh Psammite Fm Alluvial: alluvial fans, fluviatile Fm/fms Formation(s)

o p r Ardair Semipelite Fm ^ ^ ^ Major palaeosol Cryogenian 700.0 Paralic: deltaic, estuarine N e Loch Laggan Psammite Fm Mb Member Coire nan Laogh Semipelite Fm Grampian Group Lacustrine, including playa lakes, lagoon Coal Garva Bridge Psammite Fm sand coastal sabkha evaporites Lst Limestone TIAN Aeolian: sand dunes, loess Chert/flint Mst Mudstone

Glacial

PROTEROZOIC Phosphatic, ferruginous or glauconitic Sst Sandstone KNOYDAR Notes Clastic shoreline: beach, barrier island Volc Volcanic

“PRECAMBRIAN” Bioherm 850.0 870.0 Pluton: ultramafic Shallow marine siliciclastic CM Coal Measures Primary/early diagenetic

Scale: 1 cm = 50 Ma Stronchreggan Fm The lithostratigraphical units are defined in the BGS Lexicon (www.bgs.ac.uk/lexicon/lexicon_intro.htms) Shallow marine carbonate: shelves, ramps, Loch Eil includes shallow marine evaporites LCM Lower Coal Measures Druim Fada Quartzite Fm Psammite Dava/Glen Banchor succession Sills/dykes: felsic Formation Group Kinlocheil Quartzite Fm Loch Eil Shallow marine calcareous mudstone MCM Middle Coal Measures Moine Glen- Druim na Saille Pelite Formation Supergroup Division Stratotype location Tonian finnan Beinn an Tuim Striped Formation A number of BGS stratigraphical framework reports are available for free download (www.bgs.ac.uk/reference/reports/home.html).Sills/dykes: mafic These result from co- Group Lochailort Pelite Formation `Deep´ marine clastic (turbidite deposits) UCM Upper Coal Measures Cailleach Head Fm Torridon operation between the BGS Stratigraphy Committee and the Geological Society StratigraphySills/d yCommissionkes: ultramafic with the aim of reviewing the stratigraphical Global Stratotype Section and Point (GSSP) Morar Aultbea Formation Lough Derg Corvanaghan Pelagic and hemipelagic (suspension

Moine Supergroup Group Group Applecross Formation Torridon Group Applecross Formation Group Formation deposits), including chalk 1000.0 Diabaig Fm classification for all parts of Great Britain for which modern information is available. Reports dealing with the () rocks of Regional Stage Stratotype Section Solid lines denote relative certainty of the age of Stenian Meall Dearg, Bay of Stoer Sleat Group Tarskavaig Group Without interpretation

o i c Stoer Group 1200.0 & Clachtoll formations Scotland, the Lower Jurassic of England and Wales, the Westphalian to Early red beds of the Pennine Basin, the rocks of the lithostratigraphical boundaries, whereas pecked lines s o - r o z Ectasian Extrusive igneous rocks indicate uncertainty of the position at the stagelevel.

M e 1400.0

o t e Midland Valley of Scotland, the volcanic and intrusive rocks, the Quaternary and Neogene deposits of Great Britain, the of Intrusive magmatism Calymmian p r 1600.0 Lavas: felsic (only major events shown)

i c Snowdonia and the Lleyn Peninsula and the Upper Chalk are currently available. Several more reports are currently in production. Stratherian LAXFORDIAN LAXFORDIAN1700 1779±3 Line denoting change of scale 1800.0

o z Scourie Dykes Leverburgh Belt Lavas: mafic Rhinns Complex Mainly felsic Orosirian Loch Maree Group Line denoting system boundaries 2000 2000 2000 o t e r 2050.0 Volcaniclastic within the Neoproterozoic Information concerning the activities of the BGS Stratigraphy Committee is available at www.bgs.ac.uk/reference/stratigraphy/home.html and for the Mainly mafic

o p r Rhyacian 2300.0 Scourie Dykes Metamorphic rocks l a e Geological Society Stratigraphy Commission at www.geolsoc.org.uk/gsl/groups/stratigraphy. a Siderian 2400 INVERIAN 2400 Felsic and mafic * The extent of the Pleistocene Epoch and the P 2500.0 BADCALLIAN Regional: high grade, sedimentary protolith nomenclature of the component stages is under review. a n Scale: 1 cm = 400 Ma o a r -

h a e Regional: high grade, dominantly N e c 2800.0 The regional geology of the United Kingdom is explained in the BGS series of British Regional Geology Guides and the GSNI publication intrusive igneous (felsic & mafic) protolith Deformation and metamorphism Lewisian Gneiss Complex Lewisian Gneiss Complex Lewisian Gneiss Complex Lewisian Gneiss Complex + , Westphalian and are regional e a n s o - (only major events shown) stages. The Courceyan to Westphalian D are regional The Geology of Northern Ireland. Metamorphic overprint c h a M e substages a r 3200.0 Orogenic events: a n o - ARCHAEAN Gap, hiatus gaps denote uncertainty † Tremadoc to Ashgill are regional series (epochs) a l e c h a e P a r 3600.0