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Inishtrahull Island
Inishtrahull ((アイルランド語:Inis Trá Tholl),〔(Placenames Database of Ireland: Inishtrahull/Inis Trá Tholl )〕 meaning "island of the hollow/empty beach") is the most northerly island of Ireland. It has an area of 〔(Per Ivar Haug, Gazetteer of Ireland, Trondheim University 2007. )〕 and lies about north-east of Malin Head, County Donegal. The most northerly landfall of Ireland, the Tor Beg rock, is another one kilometer to the north.〔(【引用サイトリンク】 work= Travel through the Ireland story... )〕 Inishtrahull is home to Ireland's northernmost lighthouse. The island had a resident community until 1929 and the lighthouse was manned until 1987. Today it is uninhabited and has been designated a protected area due to its wildlife.
==Geology==
The island is formed of a granitic gneiss, a type of metamorphic rock, which is known as Inishtrahull Gneiss. It is dated at 1.7 billion years old, making it Paleoproterozoic in age, and is the oldest known rock on the Irish Islands. The Inishtrahull Gneiss is considered to form part of the Rhinns complex that is also exposed on the islands of Islay and Colonsay. The Rhinns complex is correlated with the Ketilidian metamorphic belt of southern Greenland and the Svecofennian of Scandinavia.
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