234 



SOUTH AMERICA— THE ANDES EEGIONS. 



pierced by the valleys of the Ilios Chanchan, Canar, and Jubones. Beyond the 

 first short section, Chilchil, more like an isolated group than a range, the crest 



0" 



Fig. 90. — Geological Formation of Ecuadoe. 

 Scale 1 : 4,000,000. 



WestoK Greenwich 



Granite, Gneiss, Porphyries, Dioiites. Cretaceous Formations. Tertiary and Quaternary 



Crystalline Schists. Fornaations. 



Alluvia. Tufas and Volcinic Cong'lomevates. Andésites, Lavas. 

 _^^.^^^^__^^_ 62 Miles. 



is developed in a long curve of paramos, which is crossed at the Cajas pass (13,570 

 feet). Beyond the Rio Jubones the cordillera loses all regularity, and, under 

 the name of Chilla, takes a trend transverse to its primitive axis, to merge in 



