- Source: Dorotea Formation
The Dorotea Formation is a geological formation in the Río de Las Chinas Valley of the Magallanes Basin in Patagonian Chile whose strata date back to the Campanian to Maastrichtian of the Late Cretaceous.
Description
The Dorotea Formation was first described by Katz in 1963. The formation comprises sandstones with frequent conglomerate lenses, concretionary levels and claystones. The Dorotea Formation includes calcareous sandstones with abundant marine invertebrate and fragmentary vertebrate fossils. Hervé et al. (2004) obtained a maximum radiometric age of 67.4 ± 1.5 Ma from detrital zircons contained in sandstones of the Dorotea Formation.
The mudstones and sandstones of the formation were deposited in a fluvial environment. The formation conformably overlies the Tres Pasos Formation and is unconformably overlain by the Lutetian to Bartonian Man Aike Formation. The thickness of the formation ranges from 100 metres (330 ft) in the Sierra Baguales in the north to 350 metres (1,150 ft) in the eponymous Sierra Dorotea in the south.
Fossil content
The following fossils were reported from the formation:
= Amphibians
== Reptiles
== Dinosaurs
== Mammals
== Fish
== Invertebrates
=See also
List of dinosaur-bearing rock formations
Quiriquina Formation
Allen Formation, Campanian to Maastrichtian fossiliferous formation of the Neuquén Basin
Angostura Colorada Formation, Campanian to Maastrichtian fossiliferous formation of the North Patagonian Massif
La Colonia Formation, Campanian to Maastrichtian formation of the Cañadón Asfalto Basin
Colorado Formation, Campanian to Maastrichtian fossiliferous formation of the Colorado Basin
Lago Colhué Huapí Formation, Campanian to Maastrichtian fossiliferous formation of the Golfo San Jorge Basin
References
= Bibliography
=Alarcón Muñoz, J., S. Soto-Acuña, L. M. E. Manríquez, R. A. Fernández, D. Bajor, J. P. Guevara, F. Suazo Lara, M. A. and A. O. Vargas (2020), "Freshwater turtles (Testudines: Pleurodira) in the Upper Cretaceous of Chilean Patagonia", Journal of South American Earth Sciences, 102, Bibcode:2020JSAES.10202652A, doi:10.1016/j.jsames.2020.102652, retrieved 2020-06-12{{citation}}: CS1 maint: multiple names: authors list (link)
Goin, Francisco J.; et, al (2020), "First Mesozoic Mammal from Chile: the southernmost record of a Late Cretaceous Gondwanatherian" (PDF), Boletín del Museo Nacional de Historia Natural, Chile, 69 (1): 5–31, doi:10.54830/bmnhn.v69.n1.2020.8, retrieved 2020-06-12
Otero, R.A.; Soto Acuña, S.; Salazar, C.; Oyarzún, J.L. (2015), "New elasmosaurids (Sauropterygia, Plesiosauria) from the Late Cretaceous of the Magallanes Basin, Chilean Patagonia: Evidence of a faunal turnover during the Maastrichtian along the Weddellian Biogeographic Province", Andean Geology, 42: 237–267, doi:10.5027/andgeoV42n2-a05, retrieved 2020-06-12
Otero, R.A.; Suarez, M.E.; Roux, J.P. (2009), "First record of elasmosaurid plesiosaurs (Sauropterygia: Plesiosauria) in upper levels of the Dorotea Formation, Late Cretaceous (Maastrichtian), Puerto Natales, Chilean Patagonia", Andean Geology, 36: 342–350, retrieved 2020-06-12
Kuschel, G (1959), "Un curculionido del Cretácico Superior - primer insecto fósil de Chile", Investigaciones Zoológicas Chilenas, 5: 49–54
Kata Kunci Pencarian:
- Havana
- Dorotea Formation
- Stegouros
- Gonkoken
- Quiriquina Formation
- Plesiosaur
- List of South American dinosaurs
- Magallanodon
- List of stratigraphic units with dinosaur body fossils
- List of vertebrate fauna of the Maastrichtian stage
- List of plesiosaur-bearing stratigraphic units
