COROCORO COPPER DISTRICT OF BOLIVIA 29 



Meters 



27.2 Red shale 



5.7 Greenish sandstone 



4.0 Shale 



2.5 Coarse reddish, irregularly-bedded sandstone 



126.5 Badly weathered shale with occasional ledges of greenish- 

 gray sandstone 



1.3 Gray sandstone 



5.0 Red shale 



7.2 Friable gray sandstone with darker more indurated bands 



19.8 Red shale 



62.0 Red shale 



.8 Greenish sandstone 



4.0 Red shale 



.4 Brown sandstone 



24.3 Pale reddish, badly weathered shale 



27.5 Buff and reddish-brown badly weathered shale with copper 



flakes and gypsum crystals 



8.9 Red shale with courses of copper flakes and gypsum crystals 

 .2 Friable gray sandstone 



1.5 Much weathered pale reddish shale with copper flakes 

 5.7 Red shale 

 3.2 Dark-brown shale, surface covered with efforesence of salts, 



some copper splotches 

 7.2 Badly weathered red shale 

 Corocoro fault 



SECTION OF PART OF RAMOS FORMATION 



AT COROCORO 

 Meters 



114.6 Bright red clay shale 

 257.8 Concealed except for occasional outcrops of bright-red, soft 



sandy clay or argillaceous sandstone 

 3.0 Coarse red sandstone 



39.4 Soft pink sandstone with intercalated shale 

 15.2 Fine red soft sandstone 

 193.4 Red shale 



236.1 Alternating bright red sandstone and shale 

 256.1 Concealed * 



113.6 Concealed, mainly shale 

 258.1 Red shale with occasional ledges of scarcely indurated 



sandstone 

 2.0 Red sandstone 



