Conjugate Strike-Slip faults in siltstone. Near Lillooet, British Columbia.

Notice that this photo shows both right- and left-lateral faults. Because they intersect at an angle of about 60 degrees and slipped concurrently (determined from mutually cross-cutting relations not visible in this photograph), they define a conjugate set. Therefore, the maximum compressive stress is horizontal and bisects the acute angle between the faults; the minimum compressive stress is also horizontal and bisects the obtuse angle.