COROCORO COPPER DISTRICT OF BOLIVIA 23 



Meters 



.8 Sandstone 



6.0 Shale 



2.5 Sandstone 



3.1 Shale 



1.6 Sandstone 



1.8 Shale 



1.6 Sandstone 



5.0 Shale 



3.5 Sandstone 



3-9 Shale 



1.9 Sandstone 

 2.9 Shale 



1.5 Black-stained sandstone 



1.1 Shale 



1.5 Pebbly sandstone. 



.5 Shale 



1.5 Sandstone 



5-5 Shale 



1.3 Sandstone 



.7 Sandstone 



i.i Sandstone 



6.7 Red shale with thin sandstone bands 



4.5 Reddish sandstone 



5.6 Reddish shale 



.5 Reddish sandstone 



.5 Reddish shale 



.9 Reddish sandstone 



.9 Reddish shale 



.9 Reddish sandstone 



2.1 Red shale 



.2 Sandstone 



ro.o Shales 



.3 Sandstone 



26.0 Red shales 



Corocoro fault 



In this section, shales constitute 52.7 per cent of the beds, 

 sandstones 24.6 per cent, conglomeratic sandstones 18 per 

 cent, and conglomerates 4.7 per cent. The shales are almost 

 invariably red, but enclose no gypsum beds nor are they 

 gypsiferous. A large part of the sandstone is also red in 

 color, but much of it is gray, and the coarse and conglome- 



