4 NITRATE PROSPECTS IN THE AMARGOSA VALLEY. 



stratified clays are sometimes nonsaline, but more often show thin 

 films and crusts of salt in the cracks formed by drying. These clays 



FIG. 3. Typical clay hills (nitrate material), near Morrisons Siding. 



were penetrated only a few inches and the nature of their deeper 

 lying portions remains unknown. 



FIG. 4. Clay hill (nitrate material) near Morrisons Siding, showing stratification of 



clays. 



The samples taken for chemical examination comprise three classes : 



1. The surface clay formed by the disintegration of the original 

 stratified clays. 



2. The salt efflorescences from the surface of this material. 



