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Hydrogeology of Wales: Ordovician and Silurian aquifers - Revision history
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Dbk at 15:58, 29 January 2015
2015-01-29T15:58:00Z
<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==Hydrogeology of Wales - contents==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{{HOWpages}}</ins></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Hydrogeology of Wales| 009]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Hydrogeology of Wales| 009]]</div></td></tr>
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Dbk
https://earthwise.bgs.ac.uk/index.php?title=Hydrogeology_of_Wales:_Ordovician_and_Silurian_aquifers&diff=3788&oldid=prev
Dbk at 07:46, 20 May 2014
2014-05-20T07:46:04Z
<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Ordovician and Silurian strata==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Ordovician and Silurian strata==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">{| class="wikitable" width="100pt" style="margin-left</del>:<del style="font-weight: bold; text-decoration: none;">40px; margin-right:0px; margin-bottom:10px; float:right; text-align:left;"</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Image</ins>:<ins style="font-weight: bold; text-decoration: none;">P802422.jpg</ins>|<ins style="font-weight: bold; text-decoration: none;">thumb</ins>|<ins style="font-weight: bold; text-decoration: none;">300px</ins>|Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. P802422.]<ins style="font-weight: bold; text-decoration: none;">]</ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| <del style="font-weight: bold; text-decoration: none;"><img src="https://bgsintranet/asset-bank/action/directLinkImage?assetId=390740&width=300&height=150"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>|<del style="font-weight: bold; text-decoration: none;">-</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. <del style="font-weight: bold; text-decoration: none;">[https://bgsintranet/asset-bank/action/viewFullSizedImage?id=390740&size=1000 </del>P802422.]</div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">|}</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>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 (<del style="font-weight: bold; text-decoration: none;">[https://bgsintranet/asset-bank/action/viewFullSizedImage?id=428916&size=1000 </del>Figure P841814.<del style="font-weight: bold; text-decoration: none;">]</del>). 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.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>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 (<ins style="font-weight: bold; text-decoration: none;">'''</ins>Figure P841814<ins style="font-weight: bold; text-decoration: none;">'''</ins>.). 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.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td></tr>
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Dbk
https://earthwise.bgs.ac.uk/index.php?title=Hydrogeology_of_Wales:_Ordovician_and_Silurian_aquifers&diff=1358&oldid=prev
Jeth1 at 10:26, 24 September 2013
2013-09-24T10:26:22Z
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|-</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|-</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| <del style="font-weight: bold; text-decoration: none;">'''Plate 7''' </del>Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. [https://bgsintranet/asset-bank/action/viewFullSizedImage?id=390740&size=1000 P802422.]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>| Abergwesyn Pass between Aberystwyth and Llanwrtyd Wells, showing typical Silurian upland scenery. [https://bgsintranet/asset-bank/action/viewFullSizedImage?id=390740&size=1000 P802422.]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
</table>
Jeth1
https://earthwise.bgs.ac.uk/index.php?title=Hydrogeology_of_Wales:_Ordovician_and_Silurian_aquifers&diff=1250&oldid=prev
Dbk: /* Ordovician and Silurian strata */
2013-09-23T13:28:20Z
<p><span dir="auto"><span class="autocomment">Ordovician and Silurian strata</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:28, 23 September 2013</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l8">Line 8:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>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 ([https://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.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>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 ([https://bgsintranet/asset-bank/action/viewFullSizedImage?id=428916&size=1000 <ins style="font-weight: bold; text-decoration: none;">Figure </ins>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.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td></tr>
</table>
Dbk
https://earthwise.bgs.ac.uk/index.php?title=Hydrogeology_of_Wales:_Ordovician_and_Silurian_aquifers&diff=1249&oldid=prev
Dbk: /* Ordovician and Silurian strata */
2013-09-23T13:28:04Z
<p><span dir="auto"><span class="autocomment">Ordovician and Silurian strata</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr class="diff-title" lang="en-GB">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:28, 23 September 2013</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l8">Line 8:</td>
<td colspan="2" class="diff-lineno">Line 8:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>|}</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>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 (<del style="font-weight: bold; text-decoration: none;">'''FIGURE 1</del>.<del style="font-weight: bold; text-decoration: none;">1'''</del>). 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.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>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 (<ins style="font-weight: bold; text-decoration: none;">[https://bgsintranet/asset-bank/action/viewFullSizedImage?id=428916&size=1000 P841814</ins>.<ins style="font-weight: bold; text-decoration: none;">]</ins>). 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.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>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.</div></td></tr>
</table>
Dbk