Wales (Cymru) - Central and West Wales - Revision history

Dbk at 09:07, 19 April 2016

2016-04-19T09:07:48Z

← Older revision		Revision as of 10:07, 19 April 2016
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	The basement rocks have been folded during earth movements and are often steeply inclined with a slate-like appearance. The rocks are typically strongly fractured and cut by many faults. Although there are no major aquifer rocks in the area, small-scale groundwater abstraction for private supplies from these heavily fractured rocks is widespread. The rocks of the Cambrian Mountains are host to lead-silver mineralisation that was worked extensively until the early 20th century. Gold mineralisation at Dolaucothi was exploited sporadically between Iron Age and Edwardian times.		The basement rocks have been folded during earth movements and are often steeply inclined with a slate-like appearance. The rocks are typically strongly fractured and cut by many faults. Although there are no major aquifer rocks in the area, small-scale groundwater abstraction for private supplies from these heavily fractured rocks is widespread. The rocks of the Cambrian Mountains are host to lead-silver mineralisation that was worked extensively until the early 20th century. Gold mineralisation at Dolaucothi was exploited sporadically between Iron Age and Edwardian times.

	[[Category:~~18.~~ Wales (Cymru) \| 03]]		[[Category:Wales (Cymru) - summary \| 03]]

Jeth1 at 11:31, 4 November 2014

2014-11-04T11:31:06Z

← Older revision		Revision as of 12:31, 4 November 2014
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	This area contains the incised upland area of the Cambrian Mountains that extends ~~southeast~~ of the Bala Fault and ~~northwest~~ of the Welsh Borderland Fault, the latter is a network of major fractures that extend from Pontesbury in Shropshire ~~southwestwards~~ as far as St. Brides Bay in Pembrokeshire. The ~~northeastern~~ boundary of this area is coincident with the Welsh Border. No sedimentary bedrock lies on top of the basement rocks in this area.		This area contains the incised upland area of the Cambrian Mountains that extends south-east of the Bala Fault and north-west of the Welsh Borderland Fault, the latter is a network of major fractures that extend from Pontesbury in Shropshire south-westwards as far as St Brides Bay in Pembrokeshire. The north-eastern boundary of this area is coincident with the Welsh Border. No sedimentary bedrock lies on top of the basement rocks in this area.

	===Basement rocks===		==Basement rocks==
	The youngest basement rocks form layers deposited between around 460 to 420 million years ago, comprising thick units of marine mudstone and sandstone. In parts of Pembrokeshire and the Berwyn Hills layers of volcanic rock are also present. Volcanic rocks are also exposed adjacent to the Welsh Borderland Fault at Llanwrtyd Wells, Builth Wells and Shelve. In the ~~southwest~~ of the area and in the Berwyn Hills to the ~~northeast~~, mudstone, limestone, sandstone and tuffs were deposited between around 700 to 460 million years ago are exposed at surface ~~and~~ are thought to ~~extend~~ at depth beneath the area. The oldest rocks exposed in this area comprise intrusive igneous rocks, volcanic rocks and a range of sedimentary ~~rock~~ formed between around 700 to 600 million years ago and exposed in places within the Welsh Borderland Fault.		The youngest basement rocks form layers deposited between around 460 to 420 million years ago, comprising thick units of marine mudstone and sandstone. In parts of Pembrokeshire and the Berwyn Hills layers of volcanic rock are also present. Volcanic rocks are also exposed adjacent to the Welsh Borderland Fault at Llanwrtyd Wells, Builth Wells and Shelve. In the south-west of the area and in the Berwyn Hills to the north-east, mudstone, limestone, sandstone and tuffs were deposited between around 700 to 460 million years ago and are exposed at surface. They are thought to occur at depth beneath the area. The oldest rocks exposed in this area comprise intrusive igneous rocks, volcanic rocks and a range of sedimentary rocks formed between around 700 to 600 million years ago and exposed in places within the Welsh Borderland Fault.

	The basement rocks have been folded during earth movements and are often steeply inclined with a slate-like appearance. The rocks are typically strongly fractured and cut by many faults. Although there are no major aquifer rocks in the area, small scale groundwater abstraction for ~~small~~ private supplies from these heavily fractured rocks is widespread. The rocks of the Cambrian Mountains are host to ~~Lead~~-~~Silver mineralization~~ that was worked extensively until the early 20th ~~Century~~. Gold ~~mineralization~~ at Dolaucothi was exploited sporadically between Iron Age and Edwardian times.		The basement rocks have been folded during earth movements and are often steeply inclined with a slate-like appearance. The rocks are typically strongly fractured and cut by many faults. Although there are no major aquifer rocks in the area, small-scale groundwater abstraction for private supplies from these heavily fractured rocks is widespread. The rocks of the Cambrian Mountains are host to lead-silver mineralisation that was worked extensively until the early 20th century. Gold mineralisation at Dolaucothi was exploited sporadically between Iron Age and Edwardian times.

	[[Category:18. Wales (Cymru) \| 03]]		[[Category:18. Wales (Cymru) \| 03]]

Dbk: Created page with "This area contains the incised upland area of the Cambrian Mountains that extends southeast of the Bala Fault and northwest of the Welsh Borderland Fault, the latter is a netw..."

2014-10-02T13:05:08Z

Created page with "This area contains the incised upland area of the Cambrian Mountains that extends southeast of the Bala Fault and northwest of the Welsh Borderland Fault, the latter is a netw..."

New page

This area contains the incised upland area of the Cambrian Mountains that extends southeast of the Bala Fault and northwest of the Welsh Borderland Fault, the latter is a network of major fractures that extend from Pontesbury in Shropshire southwestwards as far as St. Brides Bay in Pembrokeshire. The northeastern boundary of this area is coincident with the Welsh Border. No sedimentary bedrock lies on top of the basement rocks in this area.

===Basement rocks===
The youngest basement rocks form layers deposited between around 460 to 420 million years ago, comprising thick units of marine mudstone and sandstone. In parts of Pembrokeshire and the Berwyn Hills layers of volcanic rock are also present. Volcanic rocks are also exposed adjacent to the Welsh Borderland Fault at Llanwrtyd Wells, Builth Wells and Shelve. In the southwest of the area and in the Berwyn Hills to the northeast, mudstone, limestone, sandstone and tuffs were deposited between around 700 to 460 million years ago are exposed at surface and are thought to extend at depth beneath the area. The oldest rocks exposed in this area comprise intrusive igneous rocks, volcanic rocks and a range of sedimentary rock formed between around 700 to 600 million years ago and exposed in places within the Welsh Borderland Fault.

The basement rocks have been folded during earth movements and are often steeply inclined with a slate-like appearance. The rocks are typically strongly fractured and cut by many faults. Although there are no major aquifer rocks in the area, small scale groundwater abstraction for small private supplies from these heavily fractured rocks is widespread. The rocks of the Cambrian Mountains are host to Lead-Silver mineralization that was worked extensively until the early 20th Century. Gold mineralization at Dolaucothi was exploited sporadically between Iron Age and Edwardian times.

[[Category:18. Wales (Cymru) | 03]]