“Britannia Catchments Group”的意思、由来-开放百科全书

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Britannia Catchments Group

释义

References

{{Infobox rockunit
| name = Britannia Catchments Group
| image =
| caption =
| type = Group
| age = Cromerian to Flandrian
| prilithology = alluvium
| otherlithology = river terrace deposits, peat, head, cover sand and blown sand
| namedfor =
| namedby =
| region =
| country = England, Scotland, Wales
| coordinates =
| unitof =Great Britain Superficial Deposits Supergroup
| subunits = subgroups by drainage system
| underlies =
| overlies = Albion Glacigenic Group, the Caledonia Glacigenic Group, Dunwich Group, Crag Group or bedrock
| thickness = up to 100m
| extent = throughout Great Britain
| area =
| map =
| map_caption =
}}

The Britannia Catchments Group is a Quaternary lithostratigraphic group (a sequence of rock strata or other definable geological units) present in all parts of Great Britain and including the Isle of Man. It includes a wide range of deposits including alluvium, river terrace deposits, peat, head, cover sand and blown sand of fluvial, lacustrine, mass movement, periglacial and aeolian origin. Its lower boundary is defined as an unconformable contact with the underlying Albion Glacigenic Group (in England and Wales), the Caledonia Glacigenic Group (in Scotland), the Dunwich Group, Crag Group or with older bedrock. Its upper boundary is generally the present day ground surface but it interfingers locally with the British Coastal Deposits Group.^[1]

The group is subdivided into more geographically restricted subgroups by river catchments of which the following are defined:^[2]

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

Subgroups may also be defined for the various Scottish island groups.

References

1. ^{{cite web|url=http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=BCAT|title=BGS Lexicon of Named Rock Units - Result Details|website=Bgs.ac.uk|accessdate=16 January 2019}}
2. ^MCMILLAN, A A, HAMBLIN, R J O, and MERRITT, J W. 2005. An overview of the lithostratigraphical framework for the Quaternary and Neogene deposits of Great Britain (Onshore). British Geological Survey Research Report RR/04/04 38pp. p. 11-14 {{ISBN|0 85272 516 7}}

5 : Quaternary geologic formations|Geology of England|Geology of Scotland|Geology of Wales|Geological groups

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