GCR block - Llandeilo (LDO)


Block Description

UK map showing distribution of GCR sites of GCR block LDO
Distribution of GCR sites of GCR block Llandeilo

The GCR sites selected for this GCR Block represent the British geological record of Earth history from around 460 to 458 million years ago (Ma). Originally afforded ‘Series’ status at the time of GCR site selection, the Llandeilo rocks now comprise the Llandeilian Stage of the Llanvirn Series. Rocks formed during the Llanvirn Epoch comprise the Llanvirn Series. The Llanvirn Epoch is the third of the Ordovician Period (495–440 Ma), which is the second period of the Palaeozoic Era (545 to 251 Ma). Rocks that formed during the Ordovician Period constitute the Ordovician System. Arenig–Llanvirn (excluding ‘Llandeilo’) sites have their own GCR Block. See ARE-LLV.

The Cambrian and Ordovician rocks of Britain are essentially of marine origin; freshwater and subaerial deposits have been identified only in settings where volcanic edifices were raised above sea level. Within the marine setting there are rocks of the widest variety, from sandstones and limestones of the shoreline and shallow shelves to beds that accumulated in deep basins or on the continental slopes. Transects from shelf to basin are seen in both Cambrian and Ordovician rocks, and examples of shallow- and deep-water deposits are recognized in both Anglo-Welsh and Scottish areas.

The traditional series of the Ordovician System are Tremadoc (oldest), Arenig, Llanvirn, Caradoc and Ashgill (youngest).

For details of Ordovician stratigraphy, palaeogeography, palaeontology and GCR site selection, see CAM.

Volume Introduction


Site List

Your selection found 13 GCR sites. Sites are sorted alphabetically by country, local authority and then by site name -
CodeNameCountryLocal AuthorityGrid RefGCR Site Account
2968Deadman`s & Spywood DinglesEnglandShropshire CCSO283959Not available
2809Meadowtown QuarryEnglandShropshire CCSJ311012Not available
2964Glenkiln BurnScotlandDumfries and GallowayNY007895Not available
2969Morroch Bay and Port of Spittal BayScotlandDumfries and GallowayNX015524Not available
3163Aldons QuarryScotlandSouth AyrshireNX198896Not available
2967Bach-y-graig Stream SectionWalesPOWYSSO071610Not available
2733Gwern-yfed-fach QuarryWalesPOWYSSO029526Not available
2734Llanfawr QuarryWalesPOWYSSO065617Not available
2965Bryn Banc QuarryWalesSOUTH WEST WALESSN141145Not available
2735Dynevor ParkWalesSOUTH WEST WALESSN608223Not available
2966Ffairfach Railway Cutting & River SectionWalesSOUTH WEST WALESSN629212Not available
2736Meidrim Road SectionWalesSOUTH WEST WALESSN287201Not available
2963Talar Wen, BethlehemWalesSOUTH WEST WALESSN701266Not available
Many designated sites are on private land: the listing of a site in these pages does not imply any right of public access. Search Again