Fig. 132. 



Fig. 133. 



Fig. 132 — Recessed volcanoes in the right background and eroded tuffs, ash beds, 

 and lava flows on the left. Maritime Cordillera above Cotahuasi. 



Fig. 133 — The summit of the great lava plateau above Cotahuasi on the trail to 

 Antabamba. The lavas are a mile and a half in thickness. The elevation is 16,000 

 feet. Hence the volcanoes in the background, 17,000 feet above sea level, are mere 

 hills on the surface of the lofty plateau. 



