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Image 20:
Gallery - Image 20
Intruded into Triassic sedimentary rock, the Drumadoon Sill on Arran
is composed of felsite. Formed during the Palaeogene around 60
million years ago, this thick sheet of rock illustrates columnar jointing,
formed as the once molten rock cooled and contracted. © P&A
Macdonald/SNH
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