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
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.[1]

## Description

The group is made up of four formations, from youngest to oldest these are: Millongue Formation,[note 1] Trihueco Formation, Boca Lebu Formation and Curanilahue Formation.[1]

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.[1][3]

## Notes

1. ↑ What was previously known as Caleta Viel Formation is now considered to be the roof Millongue Formation.[2]

## References

1. ↑ 1.0 1.1 1.2 García A., Floreal (1968). "Estratigrafía del Terciario de Chile Central". in Ceccioni, Giovanni (in es). El Terciario de Chile Zona Central. 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" (in es). XII Congreso Geológico Chileno. Santiago, Chile. http://biblioserver.sernageomin.cl/opac/DataFiles/12993_v3_S10_009.pdf.
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. doi:10.1016/j.tecto.2013.02.012. Bibcode: 2013Tectp.592...53B.

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