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Greencastle Bay (NW end)Down
Summary Full report
Site Type: Coastal section
Site Status: PASSI
District: Newry & Mourne District Council
Grid Reference: J24751144
Rock Age: Carboniferous (Arundian, Visean)
Rock Name: Carlingford Limestone Group
Rock Type: Limestone, Oolitic limestone, Sand, Sandstone
Other interest: cross-bedding, Marine sediments

Summary of site:

This site is significant because it is the most north-westerly exposure of the small outcrop of Carboniferous rocks in south County Down.

It consists of a few thick beds of limestone protruding through beach sands. The limestones are oolitic (composed of subspherical grains of concentric shells of calcium carbonate) and grade into lime-rich sandstones. Cross bedding and parallel laminations also occur. Ooliths are formed in shallow water by wave agitation of the sea bed and the cross laminations further confirm modest water depth in this tropical sea. The rocks belong to the Arundian stage, which means that they formed around 345 million years ago.

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