The elevation of the ford, which is here about the same as that of Aros River, 3,400 feet, was the lowest point we reached in our crossing of the Sierra Madre between Chuhuichupa and Temosachic.

It took us almost the entire day to move the animals the one mile and a half to this camp.

On the way we had found some good quartz crystals in the baryte, about four inches high and one inch in width.
The country before us looked more forbidding than ever, as if it did not want us to penetrate any further into its mysteries, but our guide seemed to be quite at home here.
Our march toward Rio Chico was about thirty miles of ups and downs, ascending to a height of 7,600 feet and descending again some 3,000 feet.

In the beginning it was almost impossible to make out the track; where it did not lead over bare rocks, it was nearly obliterated by overgrown grass.

The first ascent was over a mile long in a straight line; then, after a little while, came the most arduous climbing I had until then ever attempted.