Cura-Mallín Formation (Spanish: Formación Cura-Mallín) is a heterogeneous volcano-sedimentary formation of Oligocene-Miocene age in south-central Chile and nearby parts of Argentina. The formation's sediments were deposited in a lake environment and alongide rivers in an intra-arc basin. Southeast of Laguna del Laja Cura-Mallín Formation has a thickness of more than 1,800 m. The Cura-Mallín Formation has a north-south elongate form. The formation is considered an equivalent of Abanico Formation, either as a southern extension or as a lateral equivalent of that formation.