First bird remains from the Eocene of Algarrobo, central Chile

Yáñez, Roberto E. Yury; Otero, Rodrigo A.; Soto‐Acuña, Sergio; Suárez, Mario E.; Rubilar-Rogers, David; Ayerza, Michel Sallaberry

doi:10.5027/andgeov39n3-a10

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…Though our recently collected Eocene material is fragmentary, it provides additional support for records of the presence of mammalian and avian taxa previously proposed from even more fragmentary and controversial single elements. These new records are also consistent with those expected for the Eocene of Antarctica given longstanding hypotheses of a biotic connection between Antarctica and South America during the Paleogene as well as penecontemporaneous fossil discoveries from Patagonia (see Reguero, Marenssi & Santillana, 2002;Sallaberry et al, 2010;Yury-Yáñez et al, 2012;Acosta Hospitaleche & Olivero, 2016;Reguero et al, 2014). The Eocene mammalian record otherwise comprises gondwanatheres, marsupials, cetaceans, 'South American native ungulates' (e.g., a litoptern, astrapotheres), and additional, enigmatic eutherians (Woodburne & Zinsmeister, 1984;Borsuk-Bialynicka, 1988;Case, Woodburne & Chaney, 1988;Bond et al, 1990;Hooker, 1992;Marenssi et al, 1994;Bargo & Reguero, 1998;Fostowicz-Frelik, 2003;Reguero & Gasparini, 2006;Case, 2006;Reguero et al, 2013;Gelfo et al, 2015;Buono et al, 2016;reviewed in Gelfo et al, 2019).…”

Section: Discussionsupporting

confidence: 85%

New mammalian and avian records from the late Eocene La Meseta and Submeseta formations of Seymour Island, Antarctica

Davis

Torres

Musser

et al. 2020

PeerJ

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The middle–late Eocene of Antarctica was characterized by dramatic change as the continent became isolated from the other southern landmasses and the Antarctic Circumpolar Current formed. These events were crucial to the formation of the permanent Antarctic ice cap, affecting both regional and global climate change. Our best insight into how life in the high latitudes responded to this climatic shift is provided by the fossil record from Seymour Island, near the eastern coast of the Antarctic Peninsula. While extensive collections have been made from the La Meseta and Submeseta formations of this island, few avian taxa other than penguins have been described and mammalian postcranial remains have been scarce. Here, we report new fossils from Seymour Island collected by the Antarctic Peninsula Paleontology Project. These include a mammalian metapodial referred to Xenarthra and avian material including a partial tarsometatarsus referred to Gruiformes (cranes, rails, and allies). Penguin fossils (Sphenisciformes) continue to be most abundant in new collections from these deposits. We report several penguin remains including a large spear-like mandible preserving the symphysis, a nearly complete tarsometatarsus with similarities to the large penguin clade Palaeeudyptes but possibly representing a new species, and two small partial tarsometatarsi belonging to the genus Delphinornis. These findings expand our view of Eocene vertebrate faunas on Antarctica. Specifically, the new remains referred to Gruiformes and Xenarthra provide support for previously proposed, but contentious, earliest occurrence records of these clades on the continent.

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Section: Discussionsupporting

confidence: 85%

New mammalian and avian records from the late Eocene La Meseta and Submeseta formations of Seymour Island, Antarctica

Davis

Torres

Musser

et al. 2020

PeerJ

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“…to Eocene age have been reported. The Late Cretaceous to Paleocene outcrops consist of fossiliferous marine plataformal deposits related to the eustatic high stand developed at this time, and are exposed in the following localities, from north to south: Algarrobo (Levi & Aguirre 1960;Tavera 1980;Wall et al 1996;Yury-Ya ´n ˜ez et al 2012), Topocalma (Charrier 1973;Cecioni 1978;Tavera 1979), Faro Carranza, south of Constitucio ´n (Chanco Formation;Cecioni 1983), and in the Arauco region, at the latitude of Concepcio ´n (c. 378S) (Quiriquina Formation;Steinmann et al 1895;Wetzel 1930;Mun ˜oz-Cristi 1946, 1956Biro ´-Bago ´czky 1982;Stinnesbeck 1986;Finger et al 2007;Salazar et al 2010;Buatois & Encinas 2011). The Quiriquina Formation overlies the late Palaeozoic metamorphic complex and is unconformably overlain by the late Paleocene (?)…”

Section: First Stage (Early Late Cretaceous -Middle Eocene)mentioning

confidence: 99%

Tectono-stratigraphic evolution of the Andean Orogen between 31 and 37°S (Chile and Western Argentina)

Charrier

Ramos

Tapia

et al. 2014

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In this classic segment, many tectonic processes, like flat-subduction, terrane accretion and steepening of the subduction, among others, provide a robust framework for their understanding. Five orogenic cycles, with variations in location and type of magmatism, tectonic regimes and development of different accretionary prisms, show a complex evolution. Accretion of a continental terrane in the Pampean cycle exhumed lower to middle crust in Early Cambrian. The Ordovician magmatic arc, associated metamorphism and foreland basin formation characterized the Famatinian cycle. In Late Devonian, the collision of Chilenia and associated high-pressure/low-temperature metamorphism contrasts with the late Palaeozoic accretionary prisms. Contractional deformation in Early to Middle Permian was followed by extension and rhyolitic (Choiyoi) magmatism. Triassic to earliest Jurassic rifting was followed by subduction and extension, dominated by Pacific marine ingressions, during Jurassic and Early Cretaceous. The Late Cretaceous was characterized by uplift and exhumation of the Andean Cordillera. An Atlantic ingression occurred in latest Cretaceous. Cenozoic contraction and uplift pulses alternate with Oligocene extension. Late Cenozoic subduction was characterized by the Pampean flat-subduction, the clockwise block tectonic rotations in the normal subduction segments and the magmatism in Payenia. These processes provide evidence that the Andean tectonic model is far from a straightforward geological evolution.

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First bird remains from the Eocene of Algarrobo, central Chile

Cited by 2 publications

References 20 publications

New mammalian and avian records from the late Eocene La Meseta and Submeseta formations of Seymour Island, Antarctica

New mammalian and avian records from the late Eocene La Meseta and Submeseta formations of Seymour Island, Antarctica

Tectono-stratigraphic evolution of the Andean Orogen between 31 and 37°S (Chile and Western Argentina)

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