Graham Eaton / En echelon tension (or parallel) cracks in Carboniferous age turbidite sandstones, Bude, Cornwall, UK, May. The tension cracks have formed in the more competent sandstones as the rocks were folded. T...

Graham Eaton / En echelon tension cracks in limestone, forming a shear zone. The mineral crystals grow perpendicular to the crack indicating how the rock has been pulled apart, Clovelley, Devon, UK. January, 2022.

Graham Eaton / An en echelon band of tension gashes or cracks in rock. The cracks have become mineral infilled (quartz) with the mineral fibres growing in the direction that the cracks were opened, Abereiddy, Pembro...