420 



SOUTH AMERICA— THE ANDES REGIONS. 



Valparaiso. This ridge, consisting of hard rocks and here and there very steep 

 walls, presents numerous easy passes, all valleys or gorges through which the old 

 lakes of the inland plain escaped seawards. Colliguai, one of its crests south- 

 east of Valparaiso, attains a height of 7,320 feet. But farther south none of the 



Fig. 1Ô9.— Chiloe. 

 Scale 1 : 1,800,000. 



74-30 



V/estor breenwich 



Depths. 



0to50 

 Fathoms. 



50 Fathoms 

 and upwards. 



summits reach this elevation, and even the main chain, the granitic Nahuelbuta, 

 " Great Tiger," which runs parallel with the coast in the territory of the Arau- 

 canians, falls below 5,000 feet. Farther south, the Cordillera Pelada and other 

 coast ridges, consisting of mica schists and cancagua, that is tertiary sandstones 



