En echelon quartz veins Observe the en echelon veins and examine the relationship among the en echelon extensional veins, the slaty cleavages and the straight shearing veins En echelon slaty cleavages are perpendicular to the en echelon quartz veins After J.G. Ramsay, 1967En echelon quartz veins En echelon slaty cleavages are perpendicular to the en echelon quartz veins. After J.G.Ramsay, 1967 Observe the en echelon veins and examine the relationship among the en echelon extensional veins, the slaty cleavages and the straight shearing veins