Geology.

 A geological map of Islay, Jura and Colonsay

A geological map of Islay, Jura and Colonsay

 Rhinns Complex gneiss at Lossit Bay

Rhinns Complex gneiss at Lossit Bay

 Folded metagreywackes of the Colonsay Group near Saligo Bay

Folded metagreywackes of the Colonsay Group near Saligo Bay

 The Port Askaig Tillite on the Sound of Islay

The Port Askaig Tillite on the Sound of Islay

 The 'Billion-Year Gap' at Kilchiaran Bay

The 'Billion-Year Gap' at Kilchiaran Bay

 Stromatolites in the Bonahaven Dolomite near Bolsa

Stromatolites in the Bonahaven Dolomite near Bolsa

 Cenozoic dolorite dyke near Rhuvaal

Cenozoic dolorite dyke near Rhuvaal