(The Cordillera of Argentina and Chile is clearly the continuation of the western chain alone.) In Ecuador there is still an inner chain of ancient gneisses and schists and an outer chain composed of Mesozoic beds.
Crystalline rocks, g ranites, gneisses and schists, of the Central Xxvi.
The consist of granites, gneisses and mica-schists, with talc-schist5 amphibolites and crystalline himestones.
The prevailing types are granites, gneisses and schists.