COROCORO COPPER DISTRICT OF BOLIVIA 31 



Meters 



.6 Copper shale 



5.8 Red shale 



1.3 Red sandstone 



4.4 Red shale 



.6 Copper shale 



7.7 Red shale 



1.9 Red sandstone 

 10.9 Red shale 



7.9 Red sand, jointed with gypsum 



.6 Brown sandstone Ledge 



14.8 Red shale 



2.6 Gypsiferous band 



201.8 Gravel-covered alluvial slope with occasional outcrops of 



red shale 



186.6 Gravel-covered alluvial slopes with occasional outcrops of 



red shale 



320.5 Covered. River flood plain (chiefly red shale) 



.8 Brown sandstone, green and cupriferous in center 



8.0 Red shale 



i.o Green cupriferous shale, thin-bedded, occasional sandstone 

 lentils 



39.4 Alternating red sandstone and shale 



197.6 Alternating red shale and lighter-red friable sandstones 

 .8 Brown sandstone 



1.7 Heavy conglomerate 



3.4 Sandstone 

 3.0 Sandstone 



34.3 Poorly-exposed shale 

 17.6 Brownish shale 



18.0 Greenish to whitish contorted gypsiferous shale 



28.5 Concealed (dumps and quebrada) 



20.4 Gypsiferous cupriferous sandstone (?) (mined) 



39.3 Concealed except reddish-brown sandstone at top 



24.4 Reddish-brown sandstone with shaly intercalations 

 1.7 Reddish sandstone 



19.3 Brown shale, badly covered 



1.7 Brown sandstone 



15.0 Brown shale, lighter colored thin bands every 3 or 4 meters 



2.6 Chocolate-colored conglomerates 



7.5 Brown shale becoming sandy toward top 



5.6 Brown shale 



