are suitable in outcrop for determination of the current axis (line of movement one way or the other), but NOT suitable for the determination of a unique current direction;

are suitable in outcrop for determination of the specific direction of current movement;

are of no relevance to current movement direction studies;

can be used for determining tectonic younging directions (i.e. can the sedimentary structure be used to assess if the rock succession is still the right way up or has it been turned upside down by tectonic folding).