“…It consists from north to south of the La Catedral, La Bufa, Iturbide, Chimalpa, Salazar, San Miguel, Ajusco, La Corona, and Zempoala volcanoes, as well as other smaller structures (García-Palomo et al, 2008). Each volcanic structure has produced lava flows and domes that built the highest parts of these structures, while pyroclastic deposits, interbedded with lahar and debris avalanche deposits constitute the lower portion of the relief (fan-like morphology) surrounding the volcanic edifices (see the Main Map; Arce et al, 2008;Arce, Cruz-Fuentes, Ramírez-Luna, Herrera-Huerta, & Girón-García, 2017;Arce, Layer, et al, 2015). In this work we report a total of 14 new 40 Ar/ 39 Ar data, either whole-rock and mineral concentrate (see Table 1) to complement the available isotopic ages of this volcanic range.…”