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Largy Hill, LackTyrone
Ploughed field on west side of summit, Largy Hill, Lack, Co.Tyrone.
Summary Full report
Site Type: Field
Site Status: PASSI
District:
Grid Reference: H22713655
Rocks
Rock Age: Precambrian (Dalradian)
Rock Type: Schist
Interest
Minerals: Almandine, Muscovite
Other interest: No data, No Data

Summary of site:

At this locality large, well-formed crystals of almandine garnet are found in a silvery schist within the Mullaghcarn Formation. These are ancient Dalradian rocks around 600 million years old but the crystals formed when they were metamorphosed during a continental collision with an island arc around 465 million years ago. Outcrop is poor and most crystals are found in rock fragments unearthed by ploughing.


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