Santa Juana Formation
| Santa Juana Formation Stratigraphic range: Carnian | |
|---|---|
| Type | Geological formation |
| Sub-units |
Talcamávida-Gomero Member Unihue Member Quilacoya Member |
| Overlies | Coastal Batholith of central Chile |
| Thickness | Unknown |
| Lithology | |
| Primary | conglomerate, sandstone, siltstone, |
| Other | Arkosic sandstone, mudstone, volcanic rock, anthracite |
| Location | |
| Region | Bío Bío Region |
| Country |
 |
| Type section | |
| Named for | Santa Juana |
| Named by | Ferraris, 1981 |
Santa Juana Formation a sedimentary rock formation near Santa Juana in the lower course of Biobío River in south-central Chile. Lithologies range from conglomerate sandstone, arkosic sandstone, siltstone and mudstone.[1] The sediments that consolidate into the rocks of the formation deposited in alluvial, fluvial, lacustrine and playa lake environment. Overall the formation is rich in plant fossils.[1]
The formation was deposited over the rocks of the Coastal Batholith of central Chile in a sedimentary basin that formed along the Gastre Fault. It has been posited that the basin developed as a rift during the early break-up of Gondwana in the Triassic.[1]
References
- 1 2 3 Nielsen, Sven N. (2005). "The Triassic Santa Juana Formation at the lower Biobío River, south central Chile". Journal of South American Earth Sciences. 19: 547–562.
This article is issued from
Wikipedia.
The text is licensed under Creative Commons - Attribution - Sharealike.
Additional terms may apply for the media files.