Thank you Rangler there's been so many positive inputs on this ( TN ) and its always a pleasure to help when and if I can, I have seen a single (on an angle) 3mm wide hole and 23mm deep that indicated both depth and direction it was verified by a Tc 400 feet away, I think that they used many marks to confuse, there was 17 in a 200 ft square, both carved and profile upside V ( seems to indicate something covered ) on 4 that I have seen, They Will be just part of a sentence another perhaps 100 feet away. Most will tell you a story such as here-this- place- something- covered-distance indicator- direction indicator depth indicator and what to look for triangle- square, your job is to get them in their proper order to read them, the more that you find the better, most will have something to offer, allways look for the WINDROSE. ( prevents a lot of digging ) Information that will be avaiable, size of bars, how many, how deep, and how to find them, they had to have the info to find them and so can you, they used the pinpoint method by crossing 2 lines or a blind corner