• Source: List of geological groups of Great Britain

This is a sortable list of the groups into which the rock succession of Great Britain and surrounding seas is formally divided. Rock sequences are described by geologists by dividing them hierarchically thus: individual 'beds' of rock (or in the case of certain volcanic rocks, 'flows') are grouped into 'members', members are grouped into 'formations', formations into 'groups' and groups occasionally into 'supergroups'. Some groups are also subdivided into 'subgroups'. Not all of these hierarchical layers are necessarily present or defined within a particular rock succession. Many of these groups will be encountered as 'series' in older geological literature or indeed simply as the proper name e.g. 'Dalradian' or 'Millstone Grit' though care needs to be exercised as many of the names have or have had other meanings which may not coincide with the assemblage of rocks referred to formally through designation as a 'group'.
With all such stratigraphical terms as 'groups', 'formations' and 'members' it is standard practice to capitalise both the proper name and the 'term-word' as per the recommendation of the International Commission on Stratigraphy e.g. Wentnor Group and not Wentnor group.
Notes:

Column 1 indicates the name of the geological group. Those marked with an asterisk are no longer formally recognised but are included as they occur widely in literature.
Column 2 indicates during which geological period the rocks of each group were deposited. Note that where more than one period is indicated deposition stretched across the period boundary in at least a part of the group's geographical extent but not necessarily across the whole of its extent.
Column 3 permits sorting by period in chronological order ie Quaternary Period is 01; Neogene,03; Palaeogene,05; Cretaceous,07; Jurassic,09 Triassic,11; Permian,13; Carboniferous,15; Devonian,17; Silurian,19; Ordovician,21; Cambrian,23; Ediacaran,25; Cryogenian,27; Tonian,29; Stenian, 31; and Ectasian, 33 - the last five being some of the periods into which the Proterozoic Eon is divided.
Column 4 indicates in which of the three nations of Great Britain, the group is known to occur, followed by which of the surrounding sea areas (if any), including specifically: Atlantic Ocean, Celtic Sea, English Channel, Irish Sea, North Sea. (At present, for the purposes of this table 'Celtic Sea' also includes the Bristol Channel whilst 'Atlantic Ocean' includes all sea areas off the west coast of Scotland.) Note that the Isle of Man is not a part of Great Britain but is included here for convenience.




Supergroups


The following 'supergroups', i.e. assemblages of 'groups', are recognised:

Carboniferous Limestone Supergroup
Culm Supergroup
Dalradian Supergroup
Great Britain Superficial Deposits Supergroup
Leadhills Supergroup
Loch Ness Supergroup
Longmyndian Supergroup
Moine Supergroup - deprecated
New Red Sandstone Supergroup
Old Red Sandstone Supergroup
Pebidian Supergroup
Wester Ross Supergroup
Windermere Supergroup




Subgroups


The following 'subgroups', i.e. subdivisions of 'groups', have been named:
Albion Glacigenic Group:

Shetland Glacigenic (Albion) Subgroup
Western Isles (Albion) Glacigenic Subgroup
Northwest Highlands (Albion) Glacigenic Subgroup
Banffshire Coast and Caithness (Albion) Glacigenic Subgroup
Inverness (Albion) Glacigenic Subgroup
East Grampian (Albion) Glacigenic Subgroup
Logie-Buchan (Albion) Glacigenic Subgroup
Central Grampian (Albion) Glacigenic Subgroup
Mearns (Albion) Glacigenic Subgroup
Midland Valley (Albion) Glacigenic Subgroup
Borders (Albion) Glacigenic Subgroup
Southern Uplands (Albion) Glacigenic Subgroup
Irish Sea Coast (Albion) Glacigenic Subgroup
Manx (Albion) Glacigenic Subgroup
Central Cumbria (Albion) Glacigenic Subgroup
North Pennine (Albion) Glacigenic Subgroup
North Sea Coast (Albion) Glacigenic Subgroup
Wales (Albion) Glacigenic Subgroup
Appin Group:

Blair Atholl Subgroup
Ballachulish Subgroup
Lochaber Subgroup
Ardmillan Group:

Ardwell Subgroup
Drummuck Subgroup
Whitehouse Subgroup
Argyll Group:

Tayvallich Subgroup
Crinan Subgroup
Easdale Subgroup
Islay Subgroup
Badenoch Group:

Dava Subgroup
Glen Banchor Subgroup
Britannia Catchments Group:

Northern Highlands and Argyll Catchments Subgroup
Grampian Catchments Subgroup
Tay Catchments Subgroup
Forth Catchments Subgroup
Clyde Catchments Subgroup
Tweed Catchments Subgroup
Solway Catchments Subgroup
Northumbria Catchments Subgroup
Isle of Man Catchments Subgroup
Cheshire-North Wales Catchments Subgroup
Yorkshire Catchments Subgroup
Trent Catchments Subgroup
Severn and Avon Catchments Subgroup
West Wales Catchments Subgroup
Ouse-Nene Catchments Subgroup
Yare Catchments Subgroup
Somerset Catchments Subgroup
Thames Catchments Subgroup
Suffolk Catchments Subgroup
Cornubian Catchments Subgroup
Solent Catchments Subgroup
Sussex Catchments Subgroup
South Kent Catchments Subgroup
Grampian Group

Glen Spean Subgroup
Corrieyairack Subgroup
Glenshirra Subgroup
Caledonia Glacigenic Group:

Shetland Glacigenic Subgroup
Western Isles Glacigenic Subgroup
Northwest Highlands Glacigenic Subgroup
Banffshire Coast and Caithness Glacigenic Subgroup
Inverness Glacigenic Subgroup
East Grampian Glacigenic Subgroup
Logie-Buchan Glacigenic Subgroup
Central Grampian Glacigenic Subgroup
Mearns Glacigenic Subgroup
Midland Valley Glacigenic Subgroup
Borders Glacigenic Subgroup
Southern Uplands Glacigenic Subgroup
Irish Sea Coast Glacigenic Subgroup
Manx Glacigenic Subgroup
Central Cumbria Glacigenic Subgroup
North Pennine Glacigenic Subgroup
North Sea Coast Glacigenic Subgroup
Wales Glacigenic Subgroup
Lower Old Red Sandstone Group:

Brecon Subgroup
Cosheston Subgroup
Ditton Subgroup
Downton Subgroup
Milford Haven Subgroup
Pembroke Limestone Group:

Blackrock Limestone Subgroup
Clydach Valley Subgroup
Ogwen Group

Nant Ffrancon Subgroup




References


Searchable database of British rock names on BGS website
Waters et al. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain British Geological Survey (poster) ISBN 978-0-7518-3561-8
Waters et al. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain British Geological Survey (poster) ISBN 978-0-7518-3562-5

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