The line shows you the type of fold (mountain or valley) and the arrow tells you the directionality of the fold (fold top to bottom or fold the bottom up to the top). The different type of arrow head is just extra information to help distinguish between the two. Like, for example, traffic lights. Not only is red for stop and green for go, there is also positional information (red is on top, yellow is in the middle, green is on the bottom). Or stop signs: red for stop, the letters STOP for stop, and the octagonal shape for stop. That's my guess, anyway. Diana
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