Bit,
This is a point I would like to make. When any two people look at a map, a picture, or a group of possible/probable rock markers, (you may sitting or standing side by side) you may get different views/ ideas. What ever the individual sees the first time/first viewing will be the most likely thing they will see in subsequent views.( tunnel vision) I have come to believe our minds tend to focus on familiar things, which is why it is sometimes hard to see a new s/s that was "close enough to bite you" all the time. By opening up one's mind and thinking "outside the box" may be when we discover another meaning of what we thought we knew. Then we may be onto the solution.