1:Introduction -- 2:Background -- 3:The geological formations of the Mesozoic complex -- 4:The basic eruptive rocks of the Alvear and Sorondo ranges (Mount Olivia) -- 5:The Cretaceous layers younger than the Early Cretaceous -- 6:The estimated basement for the Fuegian Andes Mesozoic stratigraphic series and the rocks considered to be as of pre-Mesozoic age -- 7:A synthesis about the stratigraph…