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. {{cite book |author=Moreno, Teresa & Gibbons, Wes | year=2007|title=The Geology of Chile|publisher=The Geological Society|page=5| isbn=9781862392205| url=https://books.google.com/books?id=h4DBQR9jDsoC&dq=toco+orogeny&pg=PA19}}