Trapa-Trapa Formation

Trapa-Trapa Formation Stratigraphic range: Miocene
Type	Geological formation
Underlies	Cola de Zorro Formation Campanario Formation
Overlies	Cura-Mallín Formation
Lithology
Primary	Andesite lava, basaltic andesite lava, pyroclastic rocks, epiclastic rocks
Other	Basalt lava, dacite lava, tuff
Location
Region	Araucanía Region, Bío Bío Region, Maule Region, Neuquén Province
Country	Chile, Argentina
Type section
Named for	Estero Trapa-Trapa

Trapa-Trapa Formation (Spanish: Formación Trapa-Trapa) is a volcano-sedimentary formation of Miocene age in south-central Chile and nearby parts of Argentina. The largest outcrops lie in the Andes while the Chilean Central Valley host some of the smaller outcrops. The volcanic rocks of the formation are of calc-alkaline character, and are less silicic than contemporary volcanic rocks found further north in Farellones Formation.