Later, during the Quaternary the Chachani volcanic complex grew in the caldera. The older activity formed the older volcanoes Chingana northeast, Estribo east and Nocarane north of Chachani as well as the Colorado lava domes north-northwest from Nocarane and the volcanoes Chachani Base and El Angel; argon-argon dating has yielded ages ranging between 1,000,000 - 500,000 years ago for these volcanoes. Later the volcanoes El Rodado, La Horqueta and Chachani (c. 130,000 - 131,000 years ago) formed as a west-east alignment, along with the Uyupampa lava field (about 230,000 - 280,000 years ago) far west from Chachani, the Airport Domes south (between 290,000 - 400,000 years ago), the Cabrería lava domes south-southeast and the Volcancillo dome northeast from Chachani.