The Chascon dome is constructed by lava flows and has a well preserved summit crater, while Cerro Purico is a stratovolcano and also known as Cerro Toco (). Additional more subdued structures in the principal complex are high Cerro Agua Amarga () just southwest of El Chascon and the Cordon Honor with Cerro Purico Sur in the opening of the semicircle. Lahars and debris flows from the volcanoes have covered parts of the ignimbrite shield with gravels. A meltwater-fed spring on Cerro Toco is known as Aguada Pajaritos, and a small lake Laguna de Agua Amarga is found south of Chascon. Presently, the Purico complex forms the drainage divide between the Salar de Atacama and the Salar de Pujsa. The high Macon stratovolcano () and the Alitar maar () lie to the south of the main complex.