Named for Estero Trapa-Trapa Underlies Campanario Formation | Overlies Cura-Mallín Formation Primary Pyroclastic rock, Breccia | |
Regions Araucanía Region, Bío Bío Region, Maule Region, Neuquén Province | ||
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.
References
Trapa-Trapa Formation Wikipedia(Text) CC BY-SA