We made our camp at a place 7,400 feet above sea level, and here we noticed trincheras close by, with water running through them from a marsh.
We also happened to come upon some stone piles made of rough stones laid on top of each other to a height of about three feet.

The Mexicans called them "Apache Monuments," and I saw here eight or ten, three at a distance of only twenty yards from each other and lying in a line from east to west.

On the next day we found an Apache track with similar monuments.

Some of these piles did not seem to be in places difficult to travel, and therefore could hardly have been intended for guide-posts, though others might have served that purpose; nor is it easy to see how they could have been meant for boundary marks, unless they were erected by some half-castes who kept company with the Apaches, to divide off the hunting grounds of various families.

It seems to me more likely that they are connected with some religious rite.
We had some little difficulty in making our descent to the Bavispe River, but at last we discovered, and travelled down, an old but still practicable trail, dropping nearly 1,000 feet.