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- Welsh_Basin abstract "The Welsh Basin was a northeast-southwest aligned back-arc depositional basin during the Cambrian, Ordovician and Silurian periods during which a considerable thickness of marine sediments was laid down in the area. To the southeast lay the Midland Platform (a part of the micro-continent of Avalonia) and to the northwest, within the Iapetus Ocean, through what is now Ireland and the Lake District, was an island arc; a northeast-southwest aligned Irish Sea landmass which was associated with volcanic activity. Examination of the sediments and associated fossils allows the deeper centre of the basin to be distinguished from shallower 'platform' areas along its southeastern margins. From the middle Silurian onwards, collision of Avalonia with the more northerly continent of Laurentia occurred giving rise to the Caledonian Orogeny. The inversion of the basin occurred at that time i.e. its uplift and deformation.The southeastern limit of the Welsh Basin can be defined as the Welsh Borderland Fault Zone comprising the Pontesford-Linley Fault and Church Stretton Fault which stretch from Pembrokeshire to Shropshire and, in the northwest, the Menai Strait Fault Zone. Its extent to the southwest and northeast is uncertain as these areas are cloaked by more recent rocks.Siliciclastic material was derived from the landmass to its southeast Pretannia, some being deposited in the shallower margins before subsequently being redeposited as turbidites as the sediment mass became unstable from time to time. In addition to the sedimentary rocks of the Welsh Basin, there are a number of volcanic formations within the overall sequence, particularly within the Ordovician system.Typical of the sediments of the Welsh Basin are the Llandovery age Aberystwyth Grits which outcrop along the middle coastal section of Cardigan Bay and comprise alternating mudstones and turbiditic sandstones.".
- Welsh_Basin wikiPageID "34395480".
- Welsh_Basin wikiPageLength "2608".
- Welsh_Basin wikiPageOutDegree "35".
- Welsh_Basin wikiPageRevisionID "599300100".
- Welsh_Basin wikiPageWikiLink Aberystwyth_Grits_Group.
- Welsh_Basin wikiPageWikiLink Avalonia.
- Welsh_Basin wikiPageWikiLink Back-arc_basin.
- Welsh_Basin wikiPageWikiLink Basin_inversion.
- Welsh_Basin wikiPageWikiLink Britain_(place_name).
- Welsh_Basin wikiPageWikiLink Caledonian_Orogeny.
- Welsh_Basin wikiPageWikiLink Caledonian_orogeny.
- Welsh_Basin wikiPageWikiLink Cambrian.
- Welsh_Basin wikiPageWikiLink Cardigan_Bay.
- Welsh_Basin wikiPageWikiLink Category:Geology_of_Wales.
- Welsh_Basin wikiPageWikiLink Church_Stretton_Fault.
- Welsh_Basin wikiPageWikiLink Continental_collision.
- Welsh_Basin wikiPageWikiLink Continental_fragment.
- Welsh_Basin wikiPageWikiLink Formation_(geology).
- Welsh_Basin wikiPageWikiLink Geological_formation.
- Welsh_Basin wikiPageWikiLink Iapetus_Ocean.
- Welsh_Basin wikiPageWikiLink Inversion_(geology).
- Welsh_Basin wikiPageWikiLink Ireland.
- Welsh_Basin wikiPageWikiLink Island_arc.
- Welsh_Basin wikiPageWikiLink Lake_District.
- Welsh_Basin wikiPageWikiLink Laurentia.
- Welsh_Basin wikiPageWikiLink Llandovery_epoch.
- Welsh_Basin wikiPageWikiLink Menai_Strait_Fault_Zone.
- Welsh_Basin wikiPageWikiLink Micro-continent.
- Welsh_Basin wikiPageWikiLink Midland_Platform.
- Welsh_Basin wikiPageWikiLink Mudstone.
- Welsh_Basin wikiPageWikiLink Ordovician.
- Welsh_Basin wikiPageWikiLink Ordovician_system.
- Welsh_Basin wikiPageWikiLink Pembrokeshire.
- Welsh_Basin wikiPageWikiLink Pontesford-Linley_Fault.
- Welsh_Basin wikiPageWikiLink Pretannia.
- Welsh_Basin wikiPageWikiLink Sandstone.
- Welsh_Basin wikiPageWikiLink Sediment.
- Welsh_Basin wikiPageWikiLink Sedimentary_rock.
- Welsh_Basin wikiPageWikiLink Shropshire.
- Welsh_Basin wikiPageWikiLink Siliciclastic.
- Welsh_Basin wikiPageWikiLink Silurian.
- Welsh_Basin wikiPageWikiLink Turbidite.
- Welsh_Basin wikiPageWikiLink Volcanism.
- Welsh_Basin wikiPageWikiLink Welsh_Borderland_Fault_Zone.
- Welsh_Basin wikiPageWikiLinkText "Welsh Basin".
- Welsh_Basin hasPhotoCollection Welsh_Basin.
- Welsh_Basin wikiPageUsesTemplate Template:Reflist.
- Welsh_Basin subject Category:Geology_of_Wales.
- Welsh_Basin hypernym Basin.
- Welsh_Basin type NaturalPlace.
- Welsh_Basin comment "The Welsh Basin was a northeast-southwest aligned back-arc depositional basin during the Cambrian, Ordovician and Silurian periods during which a considerable thickness of marine sediments was laid down in the area.".
- Welsh_Basin label "Welsh Basin".
- Welsh_Basin sameAs m.0h_9glr.
- Welsh_Basin sameAs Q7981861.
- Welsh_Basin sameAs Q7981861.
- Welsh_Basin wasDerivedFrom Welsh_Basin?oldid=599300100.
- Welsh_Basin isPrimaryTopicOf Welsh_Basin.