Lautaro Formation
| Lautaro Formation | |
|---|---|
| Stratigraphic range: Toarcian–Aalenian, ~ | |
 Strata of the Lautaro Formation outcropping at the Tranque Lautaro | |
| Type | Geological formation |
| Underlies | Quebrada Monardes Formation |
| Overlies | La Ternera Formation |
| Thickness | ~2,600 m (8,500 ft) |
| Lithology | |
| Primary | Limestone |
| Other | Sandstone |
| Location | |
| Region | Atacama Region |
| Country |  Chile |
| Extent | Lautaro Basin |
| Type section | |
| Named for | Lautaro |
The Lautaro Formation is sedimentary and fossiliferous geological formation that largely crops out near Copiapó (Atacama Region), Chile. It is dated back to the Jurassic period (Toarcian through Aalenian stages). The lithology of the formation comprises limestone and sandstone, formed in marine settings. The Lautaro Formation preserves a marine fossil record, representing molluscs (bivalves, gastropods) and marine reptiles (metriorhynchids).[1][2]
The strata of the Lautaro Formation and its basin of deposition (the Lautaro Basin) have been subject to intense tectonic movement during the Mesozoic, producing large-scale stratigraphic discontinuity and tectonic inversion.[2][3][4][5][6]
Paleobiota of the Lautaro Formation
[edit]| Genus | Species | Material | Notes | Images |
|---|---|---|---|---|
| Gryphaea | G. darwini | Partial and complete shells.[2] | A gryphaeid bivalve. | |
| Weyla | W. alata | Partial and complete shells.[2] | A pectinid bivalve. |
| Genus | Species | Material | Notes | Images |
|---|---|---|---|---|
| Metriorhynchus | Indeterminate | Partial skull.[1] | A metriorhynchid |  |
| Genus | Species | Material | Notes | Images |
|---|---|---|---|---|
| Lithotrochus | L. humboldtii | Partial and complete shells.[2] | A trochid gastropod. |
See also
[edit]References
[edit]- ^ a b Gasparini, Z.; Vignaud, P.; Chong, G. (2000). "The Jurassic Thalattosuchia (Crocodyliformes) of Chile: a paleobiogeographic approach" (PDF). Bulletin de la Société Géologique de France. 171 (6): 657−664. doi:10.2113/171.6.657. hdl:10915/123708.
- ^ a b c d e Martínez, F.; Arriagada, C.; Mpodozis, C.; Peña, M. (2012). "The Lautaro Basin: A record of inversion tectonics in northern Chile". Andean Geology. 39 (2): 258−278. doi:10.5027/andgeoV39n2-a04.
- ^ Martínez, F.; Arriagada, C.; Valdivia, R.; Deckart, K.; Peña, M. (2015). "Geometry and kinematics of the Andean thick-skinned thrust systems: Insights from the Chilean Frontal Cordillera (28°–28.5°S), Central Andes". Journal of South American Earth Sciences. 64: 307−324. doi:10.1016/j.jsames.2015.05.001.
- ^ Martínez, F.; Arriagada, C.; Peña, M.; Deckart, K.; Charrier, R. (2016). "Tectonic styles and crustal shortening of the Central Andes "Pampean" flat-slab segment in northern Chile (27–29°S)". Tectonophysics. 667: 144−162. doi:10.1016/j.tecto.2015.11.019.
- ^ Martínez, F.; Bonini, M.; Montanari, D.; Corti, G. (2016). "Tectonic inversion and magmatism in the Lautaro Basin, northern Chile, Central Andes: A comparative approach from field data and analog models". Journal of Geodynamics. 94–95: 68−83. doi:10.1016/j.jog.2016.02.003.
- ^ Peña, M.; Quiroga, R.; Fuentes, G.; Arellano, M.; Norambuena, J.; Bascuñán, S. (2023). "Kinematic analysis of the mesozoic - Early Cenozoic deformation in the paipote basin (27°10′S)". Journal of South American Earth Sciences. 129: 104543. doi:10.1016/j.jsames.2023.104543.
