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Lebu Group
Stratigraphic range: Paleocene–Eocene
Type	Stratigraphic group
Sub-units	Millongue Formation Trihueco Formation Boca Lebu Formation Curanilahue Formation
Underlies	Ranquil Formation
Overlies	Quiriquina Formation
Lithology
Primary	Shale, sandstone, siltstone, mudstone
Other	Coal
Location
Coordinates	37°36′S 73°42′W / 37.6°S 73.7°W / -37.6; -73.7
Approximate paleocoordinates	40°06′S 64°12′W / 40.1°S 64.2°W / -40.1; -64.2
Region	Bío Bío Region
Country	Chile
Extent	Arauco Basin
Type section
Named for	Lebu
Lebu Group (Chile)

Lebu Group is stratigraphic unit of Arauco Basin in south-central Chile. The group consists of a sequence of four formations, of both marine and nonmarine origin, deposited between the Early Paleocene and Middle Eocene.

Description

The group is made up of four formations, from youngest to oldest these are: Millongue Formation, Trihueco Formation, Boca Lebu Formation and Curanilahue Formation.

The Eocene Millongue Formation is composed of shale and siltstone of both marine and continental origin. Its top is marked by an unconformity, the so-called “main unconformity” of Arauco Basin, which is thought to have formed by erosion during a period of tectonic inversion.

Notes

1. What was previously known as Caleta Viel Formation is now considered to be the roof Millongue Formation.

References

1. ^ García A., Floreal (1968). "Estratigrafía del Terciario de Chile Central". In Ceccioni, Giovanni (ed.). El Terciario de Chile Zona Central (in Spanish). Santiago de Chile: Ediorial Andrés Bello.
2. Palma-Heldt, S.; Quinzio, L.A.; Bonilla, R.; Cisterna, K. (2009). Implicancias estratigráficas del primer registro de Notofagadites en el Paleógeno de la Cuenca de Arauco, Región del Bío-Bío, Chile (PDF). XII Congreso Geológico Chileno (in Spanish). Santiago, Chile. Archived from the original (PDF) on August 18, 2016.
3. Becerra, Juan; Contreras-Reyes, Eduardo; Arriagada, César (2013). "Seismic structure and tectonics of the southern Arauco Basin, south-central Chile (~ 38°S)". Tectonophysics. 592: 53–66. Bibcode:2013Tectp.592...53B. doi:10.1016/j.tecto.2013.02.012.

v t e Major South American geological features
Tectonic plates	Antarctic Caribbean Cocos Coiba Malpelo Nazca North Andes Scotia South American
Cratons and shields	Amazonian Craton Arequipa-Antofalla Craton Atlantic Shield Central Brazilian Shield Guiana Shield Paranapanema Block Río Apa Craton Río de la Plata Craton São Francisco Craton Uruguayan Shield
Structures undergoing subduction	Antarctic plate Carnegie Ridge Chile Rise Juan Fernández Ridge Malpelo Ridge Nazca plate Nazca Ridge
Faults and shear zones	Atacama Boconó Bucaramanga-Santa Marta Cochabamba Cordillera Blanca Córdoba Dolores-Guayaquil Domeyko Eastern Frontal Gastre Huincul Liquiñe-Ofqui Magallanes-Fagnano Meta Morón Oca-Ancón Pernambuco El Pilar Romeral San Ramón Sarandí del Yí Sierra Ballena Sobral El Tigre Trans-Brazilian
Rifts and grabens	Aguapeí Amazon Rift Asunción Rift Cuyo Rift Espino Neuquén Rifts Paramirim Salta Rifts
Sedimentary basins	Altiplano Amazon Andean foreland Central Brazil Chaco Colorado Cuyo Eastern Venezuela Golfo San Jorge Magallanes Malvinas Neuquén Pantanal Paraíba Paraná Salta Solimões
Orogenies	Andean Brasiliano Cariri Velhos Chonide Famatinian Gondwanide Juruá Pampean San Rafael Sunsás Terra Australis Tilcarian
Metallogenetic provinces	Bolivian Tin Belt Chilean Iron Belt Deseado Massif El Indio Gold Belt El Mutún Iron Quadrangle Lithium Triangle Pampean Pegmatite Province
Volcanism	Volcanic provinces Andean North Central South Austral Caribbean Central Atlantic Paraná and Etendeka Hotspots Ascension Noronha hotspot Galápagos Juan Fernández San Felix Trindade

v t e 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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• Geologic groups of South America
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• Shale formations
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• Geology of Biobío Region