Tralcán Formation

Tralcán Formation (Spanish: Formación Tralcán) is a sedimentary formation of Triassic age located 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]

Tralcán Formation
Stratigraphic range: Rhaetian
TypeGeological formation
UnderliesQuaternary glacial deposits
OverliesTrafún Metamorphic Complex
Thickness>800 m (2,600 ft)
Lithology
PrimaryConglomerate, sandstone, mudstone
OtherShale
Location
Coordinates39.8°S 72.5°W / -39.8; -72.5
RegionLos Ríos Region
Country Chile
Type section
Named forTralcán
Named byAguirre & Levi
Year defined1964
Tralcán Formation (Chile)

Description

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]

Fossil content

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

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References
  1. Herbst et al., 2005
  2. Di Biase & Lillo, 1973, p.12

Bibliography
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