Lake Don Juan.

This lake is a shallow lake (approximately 3 feet deep) situated in the south fork of the bright Valley, and its waters are composed mainly of saturated calcium chloride solution. A variety of crystals are to be found on the extensive salt flats surrounding the lake, end a number of those were collected for analysis. One of these proved to be calcium chloride hexahydrate, and this appears to be the first time this substance has been found naturally occurring.

Samples of mud from the salt flats surrounding this lake aid samples from the beds of dried up lakes in the same area were also collected.