En Echelon Vein Array

Photo
Shaly Liassic limestone cut by a low-angle en echelon calcite filled vein array, Lyme Regis, Dorset, U.K. The ENE-trending veins are oblique to the E-trending array. The shear sense is sinistral. The regular planar form of the veins indicates low shear strain. The shear zone is cut by a dark joint surface.