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- Geology_of_Monmouthshire abstract "This article describes the geology of the historic county of Monmouthshire. It includes the modern administrative county and the 'principal areas' of Torfaen, Newport and Blaenau Gwent together with small parts of Cardiff and Caerphilly east of the Rhymney River.The geology of Monmouthshire in southeast Wales largely consists of a thick series of sedimentary rocks of different types originating in the Silurian, Devonian, Carboniferous, Triassic and Jurassic periods.The oldest rocks, of Silurian age, occur as a broad, northeast to southwest aligned anticline in the heart of the county. The central portion of this zone, between Usk and Pontypool, comprises the outcrop of the older shales, limestones and sandstones and, surrounded as it is by outcrops of younger rocks, is traditionally referred to as the Usk Inlier. These younger rocks are a mix of sandstones and mudstones of Devonian age and commonly referred to as the Old Red Sandstone or, colloquially the 'ORS'. The oldest rocks of the ORS sequence (and hence lowest in the sequence), the mudstones of the Raglan Mudstone Formation, are also assigned to the Silurian period, though were once considered to be Devonian. Towards the eastern, southeastern and western margins of the county are successive layers of rocks of Carboniferous age. The oldest of these and hence the lowest, resting directly on the ORS are various formations of the Carboniferous Limestone. These in turn are overlain, in the west, by the sandstones and mudstones of the Marros Group (formerly referred to as the 'Millstone Grit series') and lastly by the sandstones, mudstones and coal seams of the South Wales Coal Measures.Along the southern coastal strip are rocks of Triassic age which unconformably overlie the Devonian and Carboniferous rocks. An area of countryside at Llanwern, east of Newport is characterised by rocks of Jurassic age, the youngest solid rocks which occur within the county. Similar though smaller outcrops of Jurassic rocks can be found at Goldcliff on the Severn Estuary and also, concealed beneath more recent sediments, near the mouth of the Ebbw River south of Newport.There are a range of different types of superficial deposits of Quaternary age overlying the solid rocks ranging from estuarine alluvium along the coastal strip, through riverine alluvium in the floors of the major river valleys to glacial till and glacial sands and gravels. These 'drift' deposits also include peat, head and landslipped masses of both bedrock and superficial material.".
- Geology_of_Monmouthshire thumbnail Geologic_map_Wales_&_SW_England_EN.svg?width=300.
- Geology_of_Monmouthshire wikiPageID "29249965".
- Geology_of_Monmouthshire wikiPageLength "12411".
- Geology_of_Monmouthshire wikiPageOutDegree "106".
- Geology_of_Monmouthshire wikiPageRevisionID "672054496".
- Geology_of_Monmouthshire wikiPageWikiLink Abergavenny.
- Geology_of_Monmouthshire wikiPageWikiLink Alluvium.
- Geology_of_Monmouthshire wikiPageWikiLink Anticline.
- Geology_of_Monmouthshire wikiPageWikiLink Beacon_Hill,_Monmouthshire.
- Geology_of_Monmouthshire wikiPageWikiLink Black_Mountains,_Wales.
- Geology_of_Monmouthshire wikiPageWikiLink Blaenau_Gwent.
- Geology_of_Monmouthshire wikiPageWikiLink Bryn_Arw.
- Geology_of_Monmouthshire wikiPageWikiLink Caerphilly_(county_borough).
- Geology_of_Monmouthshire wikiPageWikiLink Caerphilly_County_Borough.
- Geology_of_Monmouthshire wikiPageWikiLink Caledonian_orogeny.
- Geology_of_Monmouthshire wikiPageWikiLink Carboniferous.
- Geology_of_Monmouthshire wikiPageWikiLink Carboniferous_Limestone.
- Geology_of_Monmouthshire wikiPageWikiLink Cardiff.
- Geology_of_Monmouthshire wikiPageWikiLink Category:Geography_of_Monmouthshire.
- Geology_of_Monmouthshire wikiPageWikiLink Category:Geology_of_Wales.
- Geology_of_Monmouthshire wikiPageWikiLink Chwarel_y_Fan.
- Geology_of_Monmouthshire wikiPageWikiLink Cirque.
- Geology_of_Monmouthshire wikiPageWikiLink Coal.
- Geology_of_Monmouthshire wikiPageWikiLink Coal_Measures.
- Geology_of_Monmouthshire wikiPageWikiLink Coal_measures.
- Geology_of_Monmouthshire wikiPageWikiLink Conglomerate_(geology).
- Geology_of_Monmouthshire wikiPageWikiLink Cwmyoy.
- Geology_of_Monmouthshire wikiPageWikiLink Devauden.
- Geology_of_Monmouthshire wikiPageWikiLink Devonian.
- Geology_of_Monmouthshire wikiPageWikiLink Dinantian.
- Geology_of_Monmouthshire wikiPageWikiLink Drift_(geology).
- Geology_of_Monmouthshire wikiPageWikiLink Ebbw_Fach.
- Geology_of_Monmouthshire wikiPageWikiLink Ebbw_River.
- Geology_of_Monmouthshire wikiPageWikiLink Ebbw_Vale.
- Geology_of_Monmouthshire wikiPageWikiLink Escarpment.
- Geology_of_Monmouthshire wikiPageWikiLink Estuary.
- Geology_of_Monmouthshire wikiPageWikiLink Fluvial_terrace.
- Geology_of_Monmouthshire wikiPageWikiLink Formation_(geology).
- Geology_of_Monmouthshire wikiPageWikiLink Geography_of_the_United_Kingdom.
- Geology_of_Monmouthshire wikiPageWikiLink Geological_formation.
- Geology_of_Monmouthshire wikiPageWikiLink Geology_of_Wales.
- Geology_of_Monmouthshire wikiPageWikiLink Geology_of_the_United_Kingdom.
- Geology_of_Monmouthshire wikiPageWikiLink Glacial_cirque.
- Geology_of_Monmouthshire wikiPageWikiLink Glacial_period.
- Geology_of_Monmouthshire wikiPageWikiLink Glacial_till.
- Geology_of_Monmouthshire wikiPageWikiLink Glaciation.
- Geology_of_Monmouthshire wikiPageWikiLink Goldcliff.
- Geology_of_Monmouthshire wikiPageWikiLink Goldcliff,_Newport.
- Geology_of_Monmouthshire wikiPageWikiLink Graig_Syfyrddin.
- Geology_of_Monmouthshire wikiPageWikiLink Gravel.
- Geology_of_Monmouthshire wikiPageWikiLink Hatterrall_Hill.
- Geology_of_Monmouthshire wikiPageWikiLink Head_(geology).
- Geology_of_Monmouthshire wikiPageWikiLink Inliers_and_outliers_(geology).
- Geology_of_Monmouthshire wikiPageWikiLink Intrusion.
- Geology_of_Monmouthshire wikiPageWikiLink Jurassic.
- Geology_of_Monmouthshire wikiPageWikiLink Lamprophyre.
- Geology_of_Monmouthshire wikiPageWikiLink Landslide.
- Geology_of_Monmouthshire wikiPageWikiLink Landslip.
- Geology_of_Monmouthshire wikiPageWikiLink Lias_Group.
- Geology_of_Monmouthshire wikiPageWikiLink Limestone.
- Geology_of_Monmouthshire wikiPageWikiLink Lithology.
- Geology_of_Monmouthshire wikiPageWikiLink Llanfihangel_nigh_Usk.
- Geology_of_Monmouthshire wikiPageWikiLink Llanfoist.
- Geology_of_Monmouthshire wikiPageWikiLink Llanwern.
- Geology_of_Monmouthshire wikiPageWikiLink Local_government_in_Wales.
- Geology_of_Monmouthshire wikiPageWikiLink Marros_Group.
- Geology_of_Monmouthshire wikiPageWikiLink Monchiquite.
- Geology_of_Monmouthshire wikiPageWikiLink Monmouth.
- Geology_of_Monmouthshire wikiPageWikiLink Monmouthshire.
- Geology_of_Monmouthshire wikiPageWikiLink Monmouthshire_(historic).
- Geology_of_Monmouthshire wikiPageWikiLink Moraine.
- Geology_of_Monmouthshire wikiPageWikiLink Mudflat.
- Geology_of_Monmouthshire wikiPageWikiLink Mudstone.
- Geology_of_Monmouthshire wikiPageWikiLink Namurian.
- Geology_of_Monmouthshire wikiPageWikiLink Neath_Disturbance.
- Geology_of_Monmouthshire wikiPageWikiLink Nevill_Hall_Hospital.
- Geology_of_Monmouthshire wikiPageWikiLink Newport,_Wales.
- Geology_of_Monmouthshire wikiPageWikiLink Old_Red_Sandstone.
- Geology_of_Monmouthshire wikiPageWikiLink Peat.
- Geology_of_Monmouthshire wikiPageWikiLink Pennant_Measures.
- Geology_of_Monmouthshire wikiPageWikiLink Pennant_Sandstone.
- Geology_of_Monmouthshire wikiPageWikiLink Periglacial.
- Geology_of_Monmouthshire wikiPageWikiLink Periglaciation.
- Geology_of_Monmouthshire wikiPageWikiLink Plateau.
- Geology_of_Monmouthshire wikiPageWikiLink Pontypool.
- Geology_of_Monmouthshire wikiPageWikiLink Principal_areas_of_Wales.
- Geology_of_Monmouthshire wikiPageWikiLink Quaternary.
- Geology_of_Monmouthshire wikiPageWikiLink Rhaetian.
- Geology_of_Monmouthshire wikiPageWikiLink Rhymney_River.
- Geology_of_Monmouthshire wikiPageWikiLink Rhymney_Valley.
- Geology_of_Monmouthshire wikiPageWikiLink Sand.
- Geology_of_Monmouthshire wikiPageWikiLink Sandstone.
- Geology_of_Monmouthshire wikiPageWikiLink Sediment.
- Geology_of_Monmouthshire wikiPageWikiLink Sedimentary_rock.
- Geology_of_Monmouthshire wikiPageWikiLink Severn_Estuary.
- Geology_of_Monmouthshire wikiPageWikiLink Shale.
- Geology_of_Monmouthshire wikiPageWikiLink Silurian.
- Geology_of_Monmouthshire wikiPageWikiLink Sirhowy_Valley.
- Geology_of_Monmouthshire wikiPageWikiLink South_Wales_Coalfield.