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The Drumadoon sill, displaying columnar jointing. (Photo: W. Gray)

Drumadoon cliff on the Isle of Arran is a Palaeogene quartz-feldspar-porphyry sill displaying massive columnar jointing. On the neighbouring shore there are many E-W trending dykes, members of the Palaeogene dyke swarm.

An excursion itinerary for this site, prepared by J.G. MacDonald in 2015, can be found here.

Site Location

OS Landranger Map: 69
OS Grid Reference: NR 885293
Latitude: 55.51
Longitude: -5.35
Blackwaterfoot (1 mile)