Tropical Andes
The Tropical Andes are located in South America following the path of the Andes. They run, mainly, through five countries, Venezuela, Colombia, Ecuador, Peru, and Bolivia. The land initially was roughly but has decreased to , leaving 25% of the original land. Due to the massive amount of area the landscape is diverse. Diverse landscapes lead to diverse habitats and the ability to provide needed resources for many species. The diverse landscape includes snow-topped mountains down to canyons and valleys. The different vegetation as altitude changes includes tropical rainforests at , cloud forests ranging from , and the highest altitudes of contain grasslands up to snow. The most diverse cloud forests found in Peru and Bolivia covers . Dry forests and woodlands are also found throughout the Tropical Andes. The range is also home to the deepest gorge in Peru at deep and Lake Titicaca, the highest navigable water with an altitude of .
Geological history of the Precordillera terrane
The Precordillera terrane of western Argentina is a large mountain range located southeast of the main Andes mountain range. The evolution of the Precordillera is noted for its unique formation history compared to the region nearby. The Cambrian-Ordovian sedimentology in the Precordillera terrane has its source neither from old Andes nor nearby country rock, but shares similar characteristics with the Grenville orogeny of eastern North America. This indicates a rift-drift history of the Precordillera in the early Paleozoic. The Precordillera is a moving micro-continent which started from the southeast part of the ancient continent Laurentia (current location: North American plate). The separation of the Precordillera (also named Cuyania) started around the early Cambrian. The mass collided with Gondwana (the ancient supercontinent in the southern hemisphere) around Late Ordovician period. Different models and thinking of rift-drift process and the time of occurrence have been proposed. This page focuses on the evidence of drifting found in the stratigraphical record of the Precordillera, as well as exhibiting models of how the Precordillera drifted to Gondwana. 
Precordillera is a Spanish geographical term for hills and mountains lying before a greater range. The term is derived from "cordillera" (mountain range)—literally "pre-mountain range"—and applied usually to the Andes.