It is in this rock that the gold- and silver-bearing quartz occurs.
Through the courtesy of the bullion-convoy I was enabled to dispatch some of my collections via Chihuahua to the museum at New York, among other things eight fine specimens of the giant woodpecker.
Then, sending my train ahead, I made with a guide a little detour to visit the beautiful waterfall near Jesus Maria.

It is formed by the River Basasiachic, which, except during the wet season, is small and insignificant.

Before the fall the stream for more than a hundred yards runs in a narrow but deep channel, which in the course of ages it has worn into the hard conglomerate rock.

The channel itself is full of erosions and hollowed-out places formed by the constant grinding and milling action of the rapidly rushing water, and the many large pebbles it carries.

Just at the very brink of the rock, a low natural arch has been eroded, and over this the stream leaps almost perpendicularly into the deep straight-walled canon below.