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.
Site LocationOS Landranger Map: 69
OS Grid Reference: NR 885293
Blackwaterfoot (1 mile)