1) Shear zones are tabular zones of higher strain than the surrounding rock, where ductile deformation occurs. Shear zones are thicker than fault zones. 2) Shear sense indicators in shear zones include asymmetric structures like S-C fabrics and mica fish, which indicate the direction of shear. Porphyroclast geometries also indicate shear sense. 3) Tension gashes and fractures that open parallel to the minimum stress axis can be used to determine the sense of shear in the zone. Their orientation and folding indicates whether shear was dextral or sinistral.