Fig. l._ GEOLOGICAL SECTION THROUGH THE ANDES FROM ARICA (CHILE) TO THE BOLIVIAN "YUNGAS." 



quart. .Tmu-n. Gcol. Soe. Vol.JJXPl X. 



Fig.2_ SKETCH-MAP OF THE COUNTRY BETWEEN ARICA ON THE PACIFIC COAST OF CHILE AND THE BOLTVIAN "TONGAS" 



SCALE I I.0OQOO0. 



