Earth:Lebu Group
From HandWiki
| 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 |
| Paleocoordinates | [ ⚑ ] 40°06′S 64°12′W / 40.1°S 64.2°W |
| 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
References
- ↑ 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.
- ↑ 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.
- ↑ 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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