COROCORO COPPER DISTRICT OF BOLIVIA 13 



THE VETAS AND RAMOS SERIES 

 THE VETAS SERIES 



A section of the Vetas formation was measured with 

 transit and stadia rod beginning at the fault plane in a small 

 ravine 2 km. north of Corocoro and continuing in a direction 

 S. 65 W. a distance of 2100 m. to the Pontezuelo River. 

 The position of the section is shown on the map. The 

 stratigraphic thickness of the beds in this section is 1,491 m. 

 This represents only part of the Vetas formation, as it does 

 not include the beds cut off by the fault below those of the 

 section, nor the overlying beds in the valley of the Ponte- 

 zuelo River, nor in the hills beyond which continue for a 

 long distance westward with the same strike and dip and 

 appear to be part of the same series. 



SECTION OF PART OF VETAS FORMATION 



NORTHWEST OF COROCORO 

 Meters 



Pontezuelo River flood plain 



4.1 Coarse red sandstone 



1.8 Red shale 



1.2 Red sandstone 

 4.1 Red shale 



3.5 Gray conglomeratic sandstone 



5.9 Red sandstone with irregular shale bands 



2.3 Red shale 



2.3 Red sandstone 

 1.8 Shale 



1.8 Coarse gray sandstone 



4.1 Shale 



1.8 Gray sandstone 

 20.5 Red shale 



9.4 Gray sandstone 

 10.5 Shale 



1.2 Gray sandstone 

 12.3 Shale 



5.9 Gray sandstone 

 13.5 Shale 



5.9 Sandstone 

 117 Shale 



