Hydrogeology of Wales: Ordovician and Silurian aquifers - Revision history

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	Much of Central Wales is now underlain by Silurian mudstones and turbiditic sandstones deposited in the so-called Welsh Basin. The arenaceous deposits are prevalent in the Aberystwyth area and are typified by the Devil’s Bridge Formation which contains subordinate mudstones and which is nearly 500 m thick. The overlying Aberystwyth Grits Group occurs along the coast between New Quay and just north of Aberystwyth. The younger Cwmystwyth Grits Group forms the core of the Central Wales Syncline. At the close of the Wenlock, deeper water conditions brought the return of black mudstones and shales typified in the Builth–Llandrindod area by the Builth Mudstones. This depositional environment continued throughout the Ludlow producing mudstones and sandstones with subordinate siltstones and limestones.		Much of Central Wales is now underlain by Silurian mudstones and turbiditic sandstones deposited in the so-called Welsh Basin. The arenaceous deposits are prevalent in the Aberystwyth area and are typified by the Devil’s Bridge Formation which contains subordinate mudstones and which is nearly 500 m thick. The overlying Aberystwyth Grits Group occurs along the coast between New Quay and just north of Aberystwyth. The younger Cwmystwyth Grits Group forms the core of the Central Wales Syncline. At the close of the Wenlock, deeper water conditions brought the return of black mudstones and shales typified in the Builth–Llandrindod area by the Builth Mudstones. This depositional environment continued throughout the Ludlow producing mudstones and sandstones with subordinate siltstones and limestones.

			==Hydrogeology of Wales - contents==
			{{HOWpages}}


	[[Category:Hydrogeology of Wales\| 009]]		[[Category:Hydrogeology of Wales\| 009]]

Dbk at 07:46, 20 May 2014

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	==Ordovician and Silurian strata==		==Ordovician and Silurian strata==

	~~{\| class="wikitable" width="100pt" style="margin-left~~:~~40px; margin-right:0px; margin-bottom:10px; float:right; text-align:left;"~~		[[Image:P802422.jpg\|thumb\|300px\|Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. P802422.]]
	\| ~~<img src="http://bgsintranet/asset-bank/action/directLinkImage?assetId=390740&width=300&height=150">~~
	\|-
	\| Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. ~~[http://bgsintranet/asset-bank/action/viewFullSizedImage?id=390740&size=1000~~ P802422.]
	\|}

	Ordovician rocks crop out extensively in north and south-west Wales and in parts of mid Wales and the Welsh Borderlands ('''Plate P802422'''). Silurian strata crop out in mid and north Wales, east of the Tywi Anticline and Welsh Borderland Fault system and in parts of south Wales (~~[http://bgsintranet/asset-bank/action/viewFullSizedImage?id=428916&size=1000~~ Figure P841814.]). The Ordovician dominantly comprises marine mudstones, siltstones and interbedded volcanic rocks with some breccia and fan deposits. The Silurian strata dominantly comprise a series of marine turbiditic mudstone and sandstone sequences with subordinate limestones.		Ordovician rocks crop out extensively in north and south-west Wales and in parts of mid Wales and the Welsh Borderlands ('''Plate P802422'''). Silurian strata crop out in mid and north Wales, east of the Tywi Anticline and Welsh Borderland Fault system and in parts of south Wales ('''Figure P841814'''.). The Ordovician dominantly comprises marine mudstones, siltstones and interbedded volcanic rocks with some breccia and fan deposits. The Silurian strata dominantly comprise a series of marine turbiditic mudstone and sandstone sequences with subordinate limestones.

	The Ordovician succession formed within a subsiding basin between faulted margins defined by the Menai Strait and Welsh Borderland Fault systems. Deposition of black marine mudstones was periodically interrupted by lava and pyroclastic debris from volcanic centres in north and south-west Wales.		The Ordovician succession formed within a subsiding basin between faulted margins defined by the Menai Strait and Welsh Borderland Fault systems. Deposition of black marine mudstones was periodically interrupted by lava and pyroclastic debris from volcanic centres in north and south-west Wales.

Jeth1 at 10:26, 24 September 2013

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	\| <img src="http://bgsintranet/asset-bank/action/directLinkImage?assetId=390740&width=300&height=150">		\| <img src="http://bgsintranet/asset-bank/action/directLinkImage?assetId=390740&width=300&height=150">
	\|-		\|-
	\| ~~'''Plate 7'''~~ Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. [http://bgsintranet/asset-bank/action/viewFullSizedImage?id=390740&size=1000 P802422.]		\| Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. [http://bgsintranet/asset-bank/action/viewFullSizedImage?id=390740&size=1000 P802422.]
	\|}		\|}

Dbk: /* Ordovician and Silurian strata */

2013-09-23T13:28:20Z

Ordovician and Silurian strata

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	\|}		\|}

	Ordovician rocks crop out extensively in north and south-west Wales and in parts of mid Wales and the Welsh Borderlands ('''Plate P802422'''). Silurian strata crop out in mid and north Wales, east of the Tywi Anticline and Welsh Borderland Fault system and in parts of south Wales ([http://bgsintranet/asset-bank/action/viewFullSizedImage?id=428916&size=1000 P841814.]). The Ordovician dominantly comprises marine mudstones, siltstones and interbedded volcanic rocks with some breccia and fan deposits. The Silurian strata dominantly comprise a series of marine turbiditic mudstone and sandstone sequences with subordinate limestones.		Ordovician rocks crop out extensively in north and south-west Wales and in parts of mid Wales and the Welsh Borderlands ('''Plate P802422'''). Silurian strata crop out in mid and north Wales, east of the Tywi Anticline and Welsh Borderland Fault system and in parts of south Wales ([http://bgsintranet/asset-bank/action/viewFullSizedImage?id=428916&size=1000 Figure P841814.]). The Ordovician dominantly comprises marine mudstones, siltstones and interbedded volcanic rocks with some breccia and fan deposits. The Silurian strata dominantly comprise a series of marine turbiditic mudstone and sandstone sequences with subordinate limestones.

	The Ordovician succession formed within a subsiding basin between faulted margins defined by the Menai Strait and Welsh Borderland Fault systems. Deposition of black marine mudstones was periodically interrupted by lava and pyroclastic debris from volcanic centres in north and south-west Wales.		The Ordovician succession formed within a subsiding basin between faulted margins defined by the Menai Strait and Welsh Borderland Fault systems. Deposition of black marine mudstones was periodically interrupted by lava and pyroclastic debris from volcanic centres in north and south-west Wales.

Dbk: /* Ordovician and Silurian strata */

2013-09-23T13:28:04Z

Ordovician and Silurian strata

← Older revision		Revision as of 14:28, 23 September 2013
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	\|}		\|}

	Ordovician rocks crop out extensively in north and south-west Wales and in parts of mid Wales and the Welsh Borderlands ('''Plate P802422'''). Silurian strata crop out in mid and north Wales, east of the Tywi Anticline and Welsh Borderland Fault system and in parts of south Wales (~~'''FIGURE 1~~.~~1'''~~). The Ordovician dominantly comprises marine mudstones, siltstones and interbedded volcanic rocks with some breccia and fan deposits. The Silurian strata dominantly comprise a series of marine turbiditic mudstone and sandstone sequences with subordinate limestones.		Ordovician rocks crop out extensively in north and south-west Wales and in parts of mid Wales and the Welsh Borderlands ('''Plate P802422'''). Silurian strata crop out in mid and north Wales, east of the Tywi Anticline and Welsh Borderland Fault system and in parts of south Wales ([http://bgsintranet/asset-bank/action/viewFullSizedImage?id=428916&size=1000 P841814.]). The Ordovician dominantly comprises marine mudstones, siltstones and interbedded volcanic rocks with some breccia and fan deposits. The Silurian strata dominantly comprise a series of marine turbiditic mudstone and sandstone sequences with subordinate limestones.

	The Ordovician succession formed within a subsiding basin between faulted margins defined by the Menai Strait and Welsh Borderland Fault systems. Deposition of black marine mudstones was periodically interrupted by lava and pyroclastic debris from volcanic centres in north and south-west Wales.		The Ordovician succession formed within a subsiding basin between faulted margins defined by the Menai Strait and Welsh Borderland Fault systems. Deposition of black marine mudstones was periodically interrupted by lava and pyroclastic debris from volcanic centres in north and south-west Wales.