Aha!!! Another Sons Of The Earth!! This one I will tell you about there craftsmanship. Like what you will see at the cache location the Native Americans primarily used dead tree's that had fallen. They did not want to kill the tree for anything that they already had available. Like after a bad storm went through took out some branchs, the Indians used the tree limbs that came down. This is how it would have looked like.
They would used the fire to weaken the outer layers of the wood so it would be easier to chisels. I dont think that what you will see at the location was made with the same concept but still really cool.
Your looking for a small spider tube covered in camo tape. Use extreme stealth this is a residential area!!!!! Email me if theres any problems!!!!!!!!