*** Welcome to piglix ***

Lebu Group

Lebu Group
Stratigraphic range: PaleoceneEocene
Type Stratigraphic group
Unit of Arauco Basin
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
Region Bío Bío Region
Country Chile
Type section
Named for Lebu

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 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.


...
Wikipedia

...