Coll

Coll is an island located west of the Isle of Mull in the Inner Hebrides of Scotland. Coll is known for its sandy beaches, which rise to form large sand dunes, for its corncrakes, and for Breacachadh Castle. It is in the council area of Argyll and Bute.

Coll is formed largely from gneiss forming the Lewisian complex, a suite of metamorphic rocks of Archaean to early Proterozoic age.
The eastern part of the island is traversed by numerous normal faults most of which run broadly northwest-southeast. Dolerite and camptonite dykes of Permo-Carboniferous or Tertiary age are also seen in the east of the island.
Quaternary sediments include raised beach deposits which are frequent around Coll’s coastline whilst stretches of alluvium occupy some low inland areas. There are considerable areas of blown sand in the west and along stretches of the north coast and of peat southwest from Arinagour.

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