Estratos de Pupunahue is the name given to the sedimentary strata of Oligocene-Miocene age that crop out in Pupunahue and Mulpún near Valdivia, Chile.
Outside this locality Estratos de Pupunahue extends below the surface over a larger area.
[1] The strata are made up of conglomerate, sandstone and mudstone (Chilean Spanish: fangolita).
The sandstone and mudstone contain layers of lignite coal that exceed 30 cm in thickness.
[1] Coal layers found in the Estratos de Pupunahue have been exploited in the mines of Catamutún,[1] Pupunahue and Mulpún ("Mulpun Beds").