Type Stratigraphic group | Region Bío Bío Region | |
Sub-units Millongue FormationTrihueco FormationBoca Lebu FormationCuranilahue Formation Primary Slate, Sandstone, Siltstone, Mudstone | ||
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.
The group is made up of four formations, from youngers to oldest these are: Millongue Formation, Trihueco Formation, Boca Lebu Formation and Curanilahue Formation.
Eocene Millongue Formation is made up of shale and siltstone of both marine and continental deposition. Its topis made up of an unconformity, the so-called “main unconformity” of Arauco Basin, which is thought to have formed by erosion during a period of tectonic inversion.
References
Lebu Group Wikipedia(Text) CC BY-SA