The Big Garden Croft, Isle of Eriskay - High Field. Drilling full-sized (25mm dia) hole. Rock flour turns brown passing through weathered fissure

Drilling full-sized (25mm dia) hole. Rock flour turns brown passing through weathered fissure

The Big Garden Croft, Isle of Eriskay – High Field. Drilling full-sized (25mm dia) hole. Rock flour turns brown passing through weathered fissure