Tralcán Formation

Tralcán Formation (Chile)

Tralcán Formation (Spanish: Formación Tralcán) is a sedimentary formation of Triassic age in Los Ríos Region in south–central Chile. It overlies unconformably the Trafún Metamorphic Complex. Tralcán Formation and nearby Panguipulli Formation form possibly the remnants of an ancient lake and river system. The formation is named after Mount Tralcán on the western edge of Riñihue Lake.^[1]

The Tralcán Formation was first defined by Aguirre and Levi in 1964, based on the outcrop at Tralcán. The more than 800 metres (2,600 ft)^[1] thick formation comprises reddish-grey conglomerates with a sandy matrix and intercalated reddish shales. The shales of the formation contain abundant fossil flora. Fossils of Cladophlebistenia oeshi have helped to redefine the age of the formation, that was formerly considered Late Jurassic (Kimmeridgian to Tithonian), to the Rhaetian of the Triassic.^[2]

The following genera of fossil flora have been identified in the formation:^[1]

• Di Biase F., Francisco; Lillo R., Fernanda (1973), Geología Regional, Geoquímica de Drenaje y Minería de la Provincia de Valdivia (PDF), Instituto de Investigación de Recursos Naturales, pp. 1–101, retrieved 2019-02-21
• Herbst, Rafael; Troncoso, Alejandro; Muñoz, Jorge (2005), "Las tafofloras triásicas de la región de los Lagos, Xma Región, Chile", Ameghiniana (in Spanish), 42 (2), retrieved 2019-02-21

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Geology of Chile

Terranes

• Arequipa-Antofalla
• Chaitenia
• Chilenia
• Chiloé
• Cuyania
• Fitz Roy
• Madre de Dios
• Mejillonia
• Patagonia

Sedimentary
formations
and groups

Cenozoic	Neogene Abanico Fm. Angostura Fm. Ayacara Fm. Bahía Inglesa Fm. Caldera Beds Caleta Godoy Fm. Caleta Herradura Fm. Campanario Fm. Chaicayán Gp. Cheuquemó Fm. Cholchol Fm. Chucal Fm. Cola de Zorro Fm. Coquimbo Fm. Cura-Mallín Gp. Farellones Fm. La Cascada Fm. Lacui Fm. La Montaña Fm. La Portada Fm. Lauca Fm. Malleco Fm. Mininco Fm. Navidad Fm. Oxaya Fm. Parga Fm. Puduhuapi Fm. Pupunahue Beds Quebrada Macusa Fm. Ranquil Fm. Río Frías Fm. San Pedro Beds Santo Domingo Fm. Temuco Fm. Traiguén Fm. Trapa-Trapa Fm. Tubul Fm. Vargas Fm. Paleogene Abanico Fm. Azapa Fm. Caleta Chonos Fm. Cheuquemó Fm. Cura-Mallín Gp. La Cascada Fm. Lebu Gp. Loreto Fm. Lupica Fm. Oxaya Fm. Parga Fm. Purilactis Gp. Pupunahue Beds Temuco Fm. Vargas Fm.
Mesozoic	Cretaceous Baños del Flaco Fm. Cerro Colorado Fm. Chacarilla Fm. Chañarcillo Gp. Coihaique Gp. Divisadero Gp. Dorotea Fm. Hornitos Fm. La Liga Fm. Ñirehuao Fm. Punta del Cobre Fm. Purilactis Gp. Quiriquina Fm. Viñita Fm. Way Gp. Zapata Fm. Jurassic Chacarilla Fm. Coihaique Gp. Ibáñez Fm. La Liga Fm. La Negra Fm. Nacientes del Biobío Fm. Nacientes del Teno Fm. Pan de Azúcar Fm. Tobífera Fm. Triassic Canto del Agua Fm. Choiyoi Gp. Panguipulli Fm. Santa Juana Fm. Tralcán Fm.
Paleozoic	Llano de Chocolate Beds

Batholiths

• Coastal central Chile
• Elqui-Limarí
• Futrono-Riñihue
• North Patagonian
• Panguipulli
• South Patagonian
• Vicuña Mackenna

Metamorphic
complexes

• Bahía Mansa
• Belén
• Chañaral
• Choapa
• Chonos
• Cordillera Darwin
• Eastern Andes
• Mejillones
• Puerto Edén
• Punta de Choros
• Quebrada del Carrizo
• Trafún
• Tierra del Fuego

Faults

• Atacama Fault
• Biobío-Aluminé Fault
• Cachet Fault
• Domeyko Fault
• El Arrayán Fault
• Futrono Fault
• Gastre Fault
• Lanalhue Fault
• Liquiñe-Ofqui Fault
• Magallanes-Fagnano Fault
• Mocha-Villarrica Fault
• Pichilemu Fault
• Reigolil-Pirihueico Fault
• San Ramón Fault
• Valeriano Fault

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