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| Llanddulas Limestone | |
|---|---|
| Name | Llanddulas Limestone |
| Period | Carboniferous |
| Type | Formation |
| Primary lithology | Limestone |
| Region | Clwyd, Wales |
| Country | United Kingdom |
| Namedfor | Llanddulas |
| Coordinates | 53.314,-3.397 |
Llanddulas Limestone is a Carboniferous limestone formation exposed near Llanddulas in Clwyd, Wales, notable for its regional stratigraphic correlations, paleontological assemblages, and historical quarrying. It figures in studies by geological surveys and universities and features in conservation assessments by heritage agencies and local authorities. The formation has been referenced in mapping by the British Geological Survey and in palaeontological syntheses involving museums and academic departments.
The formation occurs within the Carboniferous succession mapped by the British Geological Survey, and its stratigraphic position is discussed alongside the Millstone Grit Group, Coal Measures Group, and adjacent units such as the Dolwen Formation and Bala Group. Regional correlation work links the unit to sections described by the Geological Society of London and has been integrated into maps used by the National Museum Wales and the University of Cambridge geology departments. Structural studies referencing faults mapped by the Ordnance Survey and fold analyses published in journals from the University of Oxford place the limestone within the tectono-stratigraphic framework influenced by the Caledonian Orogeny and later reactivation during the Variscan Orogeny.
The limestone is primarily marine carbonate composed of fossiliferous micrite and sparite, with features catalogued by curators at the Natural History Museum, London and comparative collections at the National Museum of Scotland. Paleontological assemblages include brachiopods, crinoids, corals, and foraminifera that have been compared with taxa described in monographs from the Palaeontological Association and articles in journals published by Cambridge University Press and Elsevier. Specimens from quarries were accessioned by the Amgueddfa Cymru collections and referenced in dissertations at the University of Manchester and the University of Liverpool. Petrographic and geochemical descriptions appear in papers authored by researchers affiliated with the Royal Society and the British Association for the Advancement of Science.
Interpretations of depositional setting draw on facies models used by researchers at the University of Edinburgh and the University of Glasgow, proposing a shallow, warm, carbonate platform influenced by sea-level fluctuations recorded in Permian and Carboniferous sequences summarized by the International Commission on Stratigraphy. Conodont and brachiopod biostratigraphy used to refine age determinations reference comparative databases curated at the Smithsonian Institution and analytical protocols employed at the Natural Environment Research Council. Correlation with chronostratigraphic frameworks published by the Geological Society of America situates the unit within the Lower to Middle Carboniferous interval recognized across the British Isles and discrete basins documented by the Basin Research community.
Historically, outcrops were quarried for building stone and lime production linked to industrial activities recorded in county archives at the Denbighshire County Council and trade directories preserved at the National Archives (UK). Extraction sites feature in industrial archaeology reports produced by the Royal Commission on the Ancient and Historical Monuments of Wales and conservation assessments performed by Cadw. Supply chains for dimension stone served urban projects documented in municipal records of Liverpool, Manchester, and Chester, and the limestones have been referenced in engineering specifications prepared by the Institution of Civil Engineers and the Chartered Institute of Building.
Several exposures and quarry sites occur within landscapes covered by designations administered by Natural Resources Wales and protected listings maintained by Cadw; these sites are included in local planning frameworks of the Conwy County Borough Council and in inventories compiled by the Nature Conservancy Council (UK). Geological conservation review work by the Joint Nature Conservation Committee and site appraisals by the Geoconservation Commission inform management plans coordinated with NGOs such as the National Trust and regional trusts including the Clwydian Range and Dee Valley AONB administration.
Early descriptions were made by fieldworkers associated with the British Geological Survey and geologists writing for the Quarterly Journal of the Geological Society, followed by systematic paleontological treatments in memoirs of the Palaeontographical Society and technical reports from the University of Wales. Later isotopic, petrographic, and sequence stratigraphic studies were published by authors affiliated with the University of Southampton, the University of Bristol, and international collaborators at the University of Geneva and the University of Cologne. Key datasets have been deposited in repositories curated by the British Geological Survey, the Natural History Museum, London, and university departments that continue to support ongoing research and student theses.
Category:Geology of Wales