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Concept
Colonsay
Summary
Colonsay (ˈkɒlənzeɪ; Colbhasa; Colonsay) is an island in the Inner Hebrides of Scotland, located north of Islay and south of Mull. The ancestral home of Clan Macfie and the Colonsay branch of Clan MacNeil, it is in the council area of Argyll and Bute and has an area of . Aligned on a south-west to north-east axis, it measures in length and reaches at its widest point.
The Colonsay Group, which takes its name from the island, is an estimated sequence of mildly metamorphosed Neoproterozoic sedimentary rocks that also outcrop on the islands of Islay and Oronsay and the surrounding seabed. The sequence has been correlated with the Grampian Group, the oldest part of the Dalradian Supergroup. It includes the metawackes of the Oronsay Greywacke Formation, the sandstones of the Dun Gallain Grit Formation, the metasandstones and metamudstones of the Machrins Arkose, Kilchattan and Milbuie formations, the sandstones and phyllites of the Kiloran Flags Formation and the phyllitic semipelites and quartzites of the Staosnaig Phyllite Formation. In the far north at the north end of Traigh Ban is an outcrop of the orthogneiss of the Palaeoproterozoic age Rhinns Complex named from the larger outcrop on nearby Islay.
Intrusive igneous rocks are represented by diorites and monzonites of the 'North Britain Siluro-Devonian Calc-Alkaline Dyke Suite' seen at Scalasaig and Balnahard. Lamprophyre dykes, assigned to the same suite are also frequently seen intruding the country rocks. Later intrusions took place during the early Palaeogene period and consists of microgabbro dykes assigned to the North Britain Palaeogene Dyke Suite. The island is cut by numerous geological faults many of which are aligned either NE-SW or ENE-WSW.
Superficial deposits consist largely of modern-day beach deposits, some raised marine deposits and blown sand. There are also areas of glacial till of Pleistocene age and of peat formed in the postglacial period.
Official source
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