ILLUSTRATIONS 



PAGE 



View looking North, showing the Vetas 



series on the West side of the valley 11 



View looking North, showing the Ramos 

 series on the East side of the valley.... n 

 PLATE II. Fig. i. View looking South, showing principal 



mines on the Cerro Corocoro 19 



Fig. 2. View looking Southwest, showing the 

 town, with the Vetas series on the right, 

 and the southward extension of Cerro 



Corocoro in the left background 19 



Geological Map of the Corocoro District 32 



Tnfaceous shale showing abundance of plant ma- 

 terial (Calliandra obliqua Engelh.) 40 



Trails and mud cracks in, the Desaguadero shales. 48 

 Edentate footprint from the Desaguadero series.. 52 

 Fossil plants 115 



PLATE I. Fig. i. 

 Fig. 2. 



PLATE III. 

 PLATE IV. 



PLATE V. 

 PLATE VI. 

 PLATE VII 



