Editing Ludlow Series, Silurian, Wales

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Towards the top of the sequence, shelly conglomeratic limestone shows evidence of hardground development. The sequence reflects the progressive shallowing on a distal shelf environment passing into a nearshore, high-energy, proximal shelf setting with evidence of traction and storm processes. In Pembrokeshire, fluviatile conditions were established during early Ludlow times. At both sides of Marloes Bay, reddened marine, grey and green mudstone and quartzite (Gray Sandstone Group) are conformably overlain by red siltstone with mud-cracked surfaces and calcretes with subordinate sandstones and air-fall tuffs (Red Cliff Formation). By late Ludlow times, the Irish Sea landmass had probably merged with Pretannia. With continuing emergence, the area of marine deposition across Wales was becoming more restricted and, progressively, the basin was silting up.
 
Towards the top of the sequence, shelly conglomeratic limestone shows evidence of hardground development. The sequence reflects the progressive shallowing on a distal shelf environment passing into a nearshore, high-energy, proximal shelf setting with evidence of traction and storm processes. In Pembrokeshire, fluviatile conditions were established during early Ludlow times. At both sides of Marloes Bay, reddened marine, grey and green mudstone and quartzite (Gray Sandstone Group) are conformably overlain by red siltstone with mud-cracked surfaces and calcretes with subordinate sandstones and air-fall tuffs (Red Cliff Formation). By late Ludlow times, the Irish Sea landmass had probably merged with Pretannia. With continuing emergence, the area of marine deposition across Wales was becoming more restricted and, progressively, the basin was silting up.
 
 
== Bibliography ==
 
== Bibliography ==
 
CAVE, R, and HAINS, B A. 2001. Geology of the country around Montgomery and the Ordovican rocks of the Shelve area. ''Memoir of the British Geoloical Survey'', Sheet 165 Montgomery with part of Sheet 151 Welshpool (England and Wales).
 
CAVE, R, and HAINS, B A. 2001. Geology of the country around Montgomery and the Ordovican rocks of the Shelve area. ''Memoir of the British Geoloical Survey'', Sheet 165 Montgomery with part of Sheet 151 Welshpool (England and Wales).
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WOOD, A, and SMITH, A J. 1959. The sedimentation and sedimentary history of the Aberystwyth Grits (Upper Llandoverian). ''Quarterly Journal of the Geological Society of'' ''London'', Vol. 114 (for 1958), 163–195.
 
WOOD, A, and SMITH, A J. 1959. The sedimentation and sedimentary history of the Aberystwyth Grits (Upper Llandoverian). ''Quarterly Journal of the Geological Society of'' ''London'', Vol. 114 (for 1958), 163–195.
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{{British regional geology of Wales - contents}}
 
{{British regional geology of Wales - contents}}
 
[[Category:Regional Geology of Wales]]
 
[[Category:Regional Geology of Wales]]

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