Freshwater turtles (Testudines: Pleurodira) in the Upper Cretaceous of Chilean Patagonia

Alarcón-Muñoz, Jhonatan; Soto‐Acuña, Sergio; Manríquez, Leslie; Fernández, Roy A.; Bajor, Dániel; Guevara, Juan Pablo; Lara, Felipe Suazo; Leppe, Marcelo; Vargas, Alexander O.

doi:10.1016/j.jsames.2020.102652

Cited by 13 publications

(3 citation statements)

References 62 publications

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“…The Dorotea Formation outcropping in the eastern flank of the Río Las Chinas valley comprises 900 to 1200 m thick fossiliferous deposits of sandstones (greenish-gray and reddish-brown), frequent conglomerate and siltstone lenses, thin beds of sandy calcareous concretions and mudstones (Cecioni 1957, Katz 1963, González et al 2015, Manríquez et al 2019) (Figure 2). Along the succession there are several fossil-bearing levels with abundant pteridophytes, gymnosperms, angiosperms, bivalves, gastropods, ammonites, chondrichthyans, anurans, plesiosaurs, mosasaurs, turtles, dinosaurs, and the mammals described here (Katz 1963, Cortés 1964, Soto-Acuña et al 2014, 2016a, b, Schwartz and Graham 2015, Leppe et al 2016, Manríquez et al 2019, Alarcón et al 2020, Trevisan et al 2020) (Figure 2). The fossil-bearing mammal horizon corresponds to sandy mudstone with fine-grained sandstone lenses (Figure 2), interpreted as floodplain facies associated to a meandering fluvial deposit (Manríquez et al 2019).…”

Section: Geological and Paleontological Contextmentioning

confidence: 91%

Primer mamífero Mesozoico de Chile: el registro más austral de un gondwanaterio del Cretácico tardío

et al. 2020

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Se describe a Magallanodon baikashkenke gen. et. sp. nov., un nuevo mamífero gondwanaterio del Cretácico tardío de la Región de Magallanes, en el sur de Chile (Valle del Río de Las Chinas, Estancia Cerro Guido, norte de Puerto Natales, Provincia de Última Esperanza). Las capas portadoras se ubican entre los niveles del Campaniano tardío-Maastrichtiano temprano de la Formación Dorotea (Cuenca de Magallanes/Austral). Los nuevos restos constituyen el registro más austral de un mamífero gondwanaterio del Mesozoico, como así también el primer mamífero Mesozoico conocido para Chile. El nuevo taxón es comparable en tamaño a las formas hipsodontes Gondwanatherium (Cretácico tardío) y Sudamerica (Paleoceno temprano), pero con molares notoriamente braquidontes soportados por cuatro a cinco raíces. Como en otros gondwanaterios, posee al menos un incisivo superior rodentiforme en la serie superior. Se diagnostica y describe brevemente el nuevo taxón, considerado tentativamente como un ferugliotérido (Ferugliotheriidae). De confirmarse esta asignación, este nuevo taxón representaría el miembro de mayor tamaño para la familia. El patrón oclusal de los molariformes, con el desgaste, se semeja también al de otros gondwanaterios, en particular al de los ferugliotéridos y al del sudamerícido Gondwanatherium, agregando en consecuencia más evidencias en favor de la proximidad filogenética entre ambas familias. Se llevó a cabo un análisis de la microestructura del esmalte del incisivo superior de Magallanodon; como resultado, se encontraron varias similitudes importantes con el patrón existente en Gondwanatherium (Sudamericidae). Se discute la significación de Magallanodon en la adquisición, entre los gondwanaterios, de un patrón molariforme caracterizado por la presencia de lofos transversos. Finalmente, se discute la significación del nuevo hallazgo en el contexto de las biotas australes, incluyendo aquellas de Patagonia y Antártica.

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Section: Geological and Paleontological Contextmentioning

confidence: 91%

Primer mamífero Mesozoico de Chile: el registro más austral de un gondwanaterio del Cretácico tardío

et al. 2020

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“…The Dorotea Formation mainly comprises greenish-gray and reddish-brown sandstones with abundant conglomerate and siltstone lenses, thin beds of sandy calcareous concretions and mudstones of 900 to 1200 m thickness (98,110,115). Along the succession there are fossil-bearing levels with bivalves, ammonites, gastropods, sharks, plesiosaurs, mosasaurs, frogs, turtles, dinosaurs, mammals, fossil wood and leaves (30,87,98,110,111,116,117,118,119,120,121,122).…”

Section: Specimen Provenance and Geological Settingmentioning

confidence: 99%

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

Alarcón-Muñoz

Vargas

Püschel

et al. 2023

Preprint

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In the dusk of the dinosaur era, the advanced duck-billed dinosaurs (Family Hadrosauridae) are thought to have outcompeted other herbivores, making ecosystems less diverse and more vulnerable to the Cretaceous-Paleogene asteroid impact. They were also among the first terrestrial organisms to disperse from North America into South America. Here, we present the first new species of subantarctic duck-billed dinosaur, CPAP 3054, of early Maastrichtian age in Magallanes, Chile. Surprisingly, unlike duckbills further north in Patagonia, CPAP 3054 is not an advanced duckbill, but descends from North American forms that were transitional to Hadrosauridae, diverging shortly before the origin of this family. In North America, these forms were replaced by hadrosaurids in the late Campanian. The survival into the Maastrichtian of a pre-hadrosaurid lineage suggests the ancestors of CPAP 3054 arrived earlier in South America than the hadrosaurids, reaching further south before the Cretaceous-Paleogene mass extinction, where they avoided competition from hadrosaurids.Additional noteThis work contains a new biological name. New names in preprints are not considered available by the ICZN. To avoid ambiguity, the new biological name is not included in this preprint, and the holotype specimen number CPAP 3054 is used as a placeholder. Paratypes described in this preprint are also used in the diagnosis.

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“…The fossil record includes abundant marine invertebrates and vertebrate remains (dinosaurs, turtles, frogs, mammals, birds, sharks and marine reptiles), as well as vegetal fossils such as leaves and trunks (Katz 1963; Cortés 1964; Schwartz & Graham 2015; Manríquez et al., 2019, 2021; Alarcón‐Muñoz et al . 2020; Goin et al . 2020; Trevisan et al .…”

Section: Geological Settingmentioning

confidence: 99%

A unique Late Cretaceous fossil wood assemblage from Chilean Patagonia provides clues to a high‐latitude continental environment

Martínez,

Leppe,

Manríquez

et al. 2023

Papers in Palaeontology

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Fossil plants, including large trunks, stems, some branches, and twigs, were collected from the Maastrichtian (68.9 Ma), upper Dorotea Formation in the Magallanes–Austral Basin, 16 km north of the Cerro Guido–Las Chinas complex in the southern Chilean Magallanes region. These fossil trunks range from 0.2 to 2.2 m in length. Petrographic slides were made in three sections (transverse, radial and tangential) and analysed under a light microscope to study the permineralized fossils. The woods and stems belong to Austroginkgoxylon gen. et sp. nov., Agathoxylon antarcticum, Podocarpoxylon paradoxi sp. nov., Podocarpoxylon mazzonii, Palmoxylon subantarcticae and Notomalvaceoxylon magallanense gen. et sp. nov. The growth rings of gymnosperms and anatomical characters of angiosperms were analysed to obtain palaeoecological data. Interactions between gymnosperm roots growing into the secondary xylem of an angiosperm (nurse logs) are recorded. The data obtained from the fossil woods suggest warm and humid conditions in this southern South American locality during the Late Cretaceous, providing a unique opportunity to study continental environments at high southern latitudes, which are poorly represented on a global scale.

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Freshwater turtles (Testudines: Pleurodira) in the Upper Cretaceous of Chilean Patagonia

Cited by 13 publications

References 62 publications

Primer mamífero Mesozoico de Chile: el registro más austral de un gondwanaterio del Cretácico tardío

Primer mamífero Mesozoico de Chile: el registro más austral de un gondwanaterio del Cretácico tardío

Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile

A unique Late Cretaceous fossil wood assemblage from Chilean Patagonia provides clues to a high‐latitude continental environment

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