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Tamny Townland, FeenyLondonderry
PHOTO TO BE ADDED
Summary Full report
Site Type: Quarry (disused)
Site Status: PASSI
District:
Grid Reference: X26334032
Rocks
Rock Name: Dungiven Formation
Rock Type: Pelitic rock, Marble
Interest
Minerals: Calcite, Chalcopyrite, Pyrite
Other interest: mineral vein, No Data

Summary of site:

In this small quarry in the Dungiven Limestone Formation of the ancient Dalradian Supergroup, a bed of altered limestone about 4 m thick can be seen sandwiched between metamorphosed mudstones. It is the mineralization of this limestone by hot brine solutions circulating through the rock that provides the main interest. Pyrite (iron sulphide), chalcopyrite (copper iron sulphide), and galena (lead sulphide) occur in a 10 cm layer aligned with the bedding of the limestone. Veins of calcite up to 5 mm thick are also found, mostly in the joints of the limestone. Cubes of pyrite also occur within the limestone. Nothing is known of the age of the mineralization.


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