La Pacana together with the Cerro Guacha and Purico Complex calderas forms the La Pacana Complex. Guacha experienced two major eruptions, of which one occurred 4.1 million years ago. The Purico complex began erupting 1.3 million years ago; it is the youngest centre of the La Pacana Complex with the youngest eruptions occurring during the Holocene. Additional volcanic centres west and southwest of La Pacana are Acamarachi, Láscar, Colachi and Cordón de Puntas Negras.