Some of my thoughts about drill holes and monuments. Smallest drill hole that I have seen = 1/4 inch, largest = 16 inches wide, deepest 32 inches, shallow = small pecks usually form some type of animal tracks could indicate some type of directional indicator such as an arrow, or a map of sorts. Monuments = smallest = 2 inch turkey track, largest = rabbit 6 foot high and 10 feet, long. This is just things that I have run thru my mind, smallest things usually indicate a shorter distance i.e. = feet , then pace, then jumping to cordell, league and Kilometer for the largest much like a long snake, huge turtle, elephant, profile of a face, they can be seen for a long distance and some can be followed both ways some can not. I feel that the largest indicate long distances. Most of all folks keep things in persective use common sence and above all be safe and have fun, They leave messages at EVERY symbol learn to read sign, You must have Direction, Distance, those things they must show. When you find a yard ( lots of symbols in a small area, CAN be a large monument in a yard to hinder your progress, telling you to go away over yonder and look, don't be fooled ) stay put and get things figured out. Good Luck