La Cascada Formation a sedimentary formation near Futaleufú in the western Patagonian Andes of southern Chile. Lithologies vary from sandstone, siltstone and conglomerate. The sediment that now forms the rock deposited during the Oligocene and Early Miocene epoch in shallow marine environment. The formation contain fossils of bivalves and gastropods.[1]
| La Cascada Formation | |
|---|---|
| Stratigraphic range: Late Oligocene–Early Miocene | |
| Type | Geological formation |
| Overlies | Cretaceous granitoids Divisadero Group Lower Jurassic volcanic rocks |
| Thickness | 130 m (430 ft) |
| Lithology | |
| Primary | Sandstone, siltstone, conglomerate |
| Location | |
| Region | Los Lagos Region |
| Country |  Chile |
| Type section | |
| Named by | Thiele et al. |
| Year defined | 1978 |
The formation unconformably overlies sedimentary rock of Jurassic age, Cretaceous sedimentary rocks of Divisadero Group and Cretaceous granite plutons.[1][2]
Further south in Aysén Region, the Guadal Formation is a geologically equivalent formation.[1]
See also
editReferences
edit- ^ a b c Encinas, Alfonso; Folguera, Andrés; Bechis, Florencia; Finger, Kenneth L.; Zambrano, Patricio; Pérez, Felipe; Benarbé, Pablo; Tapia, Francisca; Riffo, Ricardo; Buatois, Luis; Orts, Darío; Nielsen, Sven N.; Valencia, Victor V.; Cituño, José; Oliveros, Verónica; De Girolamo Del Mauro, Lizet; Ramos, Víctor A. (2018). "The Late Oligocene–Early Miocene Marine Transgression of Patagonia". In Folguera, A.; Contreras Reyes, E.; Heredia, N.; Encinas, A.; Iannelli, S. B.; Oliveros, V.; M. Dávila, F.; Collo, G.; Giambiagi, L.; Maksymowicz, A.; Iglesia Llanos, M.P.; Turienzo, M.; Naipauer, M.; Orts, D.; Litvak, V. D.; Alvarez, O.; Arriagada, C. (eds.). The Evolution of the Chilean-Argentinean Andes. Springer. pp. 443–474. ISBN 978-3-319-67774-3.
- ^ Charrier, Reynaldo; Pinto, Luisa; Rodríguez, María Pía (2006). "3. Tectonostratigraphic evolution of the Andean Orogen in Chile". In Moreno, Teresa; Gibbons, Wes (eds.). Geology of Chile. Geological Society of London. p. 107. ISBN 9781862392199.