Trapa-Trapa Formation

Trapa-Trapa Formation
Stratigraphic range: Miocene
Type	Geological formation
Underlies	Cola de Zorro Formation Campanario Formation
Overlies	Cura-Mallín Group
Lithology
Primary	Andesitic lava, basaltic andesite lava, pyroclastic rocks, epiclastic rocks
Other	Basaltic lava, dacitic lava, tuff
Location
Coordinates	38.0°S 71.6°W / -38.0; -71.6
Region	Araucanía, Bío Bío & Maule Regions Neuquén Province
Country	Chile  Argentina
Type section
Named for	Estero Trapa-Trapa
Trapa-Trapa Formation (Chile)

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 the Farellones Formation.[1]

References

1. Muñoz B., Jorge; Niemeyer R., Hans (1984). "Petrología de la formación Trapa-Trapa y consideraciones acerca del volcanismo mioceno entre los 36° y 39° lat. S (codillera principal)". Revista Geológica de Chile. 23: 53–67. Retrieved 23 August 2016.