From Wikipedia, the free encyclopedia
Geological formation in the Río de Las Chinas Valley, Magallanes Basin, Chile
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 .
[1]
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.
[2]
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 .
[3] 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.
[4]
The following fossils were reported from the formation:
[5]
Amphibians of Dorotea Formation
Taxa
Species
Material
Notes
Images
Anura
[6]
Indeterminate
A frog
^
Dorotea Formation at
Fossilworks .org
^
a
b
c
d Otero et al., 2009
^ Goin et al., 2020, p.9
^
a
b
c
d Otero et al., 2015, p.240
^
Río de las Chinas Valley at
Fossilworks .org
^
a
b
c
d
e
f
g Alarcón Muñoz et al., 2020
^
a
b Otero et al., 2015
^
a
b
c
d
e Davis, Sarah N.; Soto-Acuña, Sergio; Fernández, Roy A.; Amudeo, Jared; Leppe, Marcelo A.; Rubilar-Rogers, David; Vargas, Alexander O.; Clarke, Julia A. (December 2022).
"New records of Theropoda from a Late Cretaceous (Campanian-Maastrichtian) locality in the Magallanes-Austral Basin, Patagonia, and insights into end Cretaceous theropod diversity" . Journal of South American Earth Sciences . 122 : 104163.
doi :
10.1016/j.jsames.2022.104163 .
S2CID
254850180 .
^ Alarcón-Muñoz, Jhonatan; Vargas, Alexander O.; Püschel, Hans P.; Soto-Acuña, Sergio; Manríquez, Leslie; Leppe, Marcelo; Kaluza, Jonatan; Milla, Verónica; Gutstein, Carolina S.; Palma-Liberona, José; Stinnesbeck, Wolfgang; Frey, Eberhard; Pino, Juan Pablo; Bajor, Dániel; Núñez, Elaine (2023-06-16).
"Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile" . Science Advances . 9 (24): eadg2456.
Bibcode :
2023SciA....9G2456A .
doi :
10.1126/sciadv.adg2456 .
ISSN
2375-2548 .
PMC
10275600 .
PMID
37327335 .
^
a
b Goin et al., 2020
^ Martinelli, A. G.; Soto-Acuña, S.; Goin, F. J.; Kaluza, J.; Bostelmann, J. E.; Fonseca, P. H. M. F.; Reguero, M. A.; Leppe, M.; Vargas, A. O. (2021).
"New cladotherian mammal from southern Chile and the evolution of mesungulatid meridiolestidans at the dusk of the Mesozoic era" . Scientific Reports . 11 (7594): 7594.
Bibcode :
2021NatSR..11.7594M .
doi :
10.1038/s41598-021-87245-4 .
PMC
8027844 .
PMID
33828193 .
^ Kuschel, 1959
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