Description: 1) Arrows indicating the dip direction of the fault plane are only required (a) if the fault type (normal, reverse) is unknown, or (b) some useful purpose is served by depicting the fault dip.
2) Barbs for fault type show the relative structural position of blocks and are always directed towards the hanging wall, i.e. point down the dip of the fault.
3) If colour is used, faults are depicted in red.
4) The fault symbol used must also be qualified according to reliability