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From Wikipedia, the free encyclopedia
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.[1] Lithologies range from conglomerate sandstone, arkosic sandstone, siltstone and mudstone.[2]
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 | 37.2°S 73.0°W |
Approximate paleocoordinates | 53.8°S 39.9°W |
Region | Bío Bío Region |
Country | Chile |
Type section | |
Named for | Santa Juana |
Named by | Ferraris |
Year defined | 1981 |
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.[2]
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.[2]
The following fossils have been reported from the formation:[1]
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