Santa Juana Formation
| Santa Juana Formation | |
|---|---|
| Stratigraphic range: Carnian ~ | |
| Type | Geological formation |
| Sub-units | Talcamávida-Gomero, Unihue & Quilacoya Members |
| Overlies | Coastal Batholith of central Chile |
| Thickness | Unknown |
| Lithology | |
| Primary | Conglomerate, sandstone, siltstone |
| Other | Arkosic sandstone, mudstone, volcanic rock, anthracite |
| Location | |
| Coordinates | 37°12′S 73°00′W / 37.2°S 73.0°W |
| Approximate paleocoordinates | 53°48′S 39°54′W / 53.8°S 39.9°W |
| Region | Bío Bío Region |
| Country | Chile |
| Type section | |
| Named for | Santa Juana |
| Named by | Ferraris |
| Year defined | 1981 |
Santa Juana Formation a Late Triassic (Carnian stage) sedimentary rock formation near Santa Juana in the lower course of the Biobío River in south-central Chile. Lithologies range from conglomerate sandstone, arkosic sandstone, siltstone and mudstone.