Toco orogeny
The Toco orogeny was a mountain building affecting the rocks of northern Chile and northwestern Argentina during the Late Carboniferous and Permian. In 1991, researchers Bahlburg and Breitkurz noted that Chilean rocks had a 100 million lull magmatic and metamorphic "lull" from the Silurian to the Carboniferous. They defined the Toco orogeny as the period when active margin conditions returned in the region. See also Geology of Chile Geology of Argentina List of orogenies References Orogenies of South America Paleozoic orogenies Carboniferous orogenies Permian orogenies Geology of Argentina Geology of Chile