Leslie M.E. Manríquez

Instituto Antártico Chileno

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Marcelo Leppe

Instituto Antártico Chileno

Cristine Trevisan

Instituto Antártico Chileno

Alexander O. Vargas

University of Chile

Juan Pablo Pino

University of Chile

Jonatan Kaluza

Consejo Nacional de Investigaciones Científicas y Técnicas

Héctor Ortíz

Universidad de Magallanes

Roy A. Fernández

University of Chile

Sergio Soto‐Acuña

University of Chile

Jhonatan Alarcón-Muñoz

University of Chile

David Rubilar-Rogers

National Monuments Council

Cooperative Institutions

University of Chile

Universidade do Vale do Rio dos Sinos

Instituto Antártico Chileno

Consejo Nacional de Investigaciones Científicas y Técnicas

University of Concepción

Centro Científico Tecnológico - Tucumán

National Monuments Council

Universidade Federal do Rio Grande do Sul

Centro Científico Tecnológico - San Juan

Universidad Nacional de La Plata

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Genesis of fossil concentrations in foreland basins: A case study of the middle Eocene Man Aike Formation, Magallanes Basin, Chilean Patagonia

Evolving Earth (2024)

Erildo Vicente Müller Rodrigo Scalise Horodyski Karlos Guilherme Diemer Kochhann Gérson Fauth Leslie M.E. Manríquez

10.1016/j.eve.2024.100053

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Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile

Nature (2021)

Sergio Soto‐Acuña Alexander O. Vargas Jonatan Kaluza Marcelo Leppe João Francisco Botelho

10.1038/s41586-021-04147-1

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Citations (26)

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

Papers in Palaeontology (2023)

Leandro C.A. Martínez Marcelo Leppe Leslie M.E. Manríquez Juan Pablo Pino Cristine Trevisan

Abstract 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.

Gymnosperm

Cupressaceae

Fossil wood

10.1002/spp2.1536

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Citations (5)

Evolution of a high latitude high-energy beach system (Maastrichtian–Eocene, Magallanes/Austral Basin, Chilean Patagonia)

Sedimentary Geology (2021)

Leslie M.E. Manríquez Ernesto Luiz Corrêa Lavina Renata Guimarães Netto Rodrigo Scalise Horodyski Marcelo Leppe

Taphonomy

Longshore drift

Shoal

Bioturbation

10.1016/j.sedgeo.2021.106026

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Citations (6)

High-latitude Cretaceous–Paleogene transition: New paleoenvironmental and paleoclimatic insights from Seymour Island, Antarctica

Marine Micropaleontology (2023)

Luiza Carine Ferreira da Silva Alessandra Santos Gérson Fauth Leslie M.E. Manríquez Karlos Guilherme Diemer Kochhann

Paleogene

paleoceanography

Terrigenous sediment

10.1016/j.marmicro.2023.102214

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Citations (4)

Chronology of deposition and unconformity development across the Cretaceous–Paleogene boundary, Magallanes-Austral Basin, Patagonian Andes

Journal of South American Earth Sciences (2019)

Sarah W.M. George Sarah N. Davis Roy A. Fernández Leslie M.E. Manríquez Marcelo Leppe

Paleogene

Chronostratigraphy

10.1016/j.jsames.2019.102237

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Citations (39)

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

bioRxiv (Cold Spring Harbor Laboratory) (2023)

Jhonatan Alarcón-Muñoz Alexander O. Vargas Hans P. Püschel Sergio Soto‐Acuña Leslie M.E. Manríquez

Abstract 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 note This 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.

Paleogene

10.1101/2023.03.04.531097

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First Mesozoic mammal from Chile: the southernmost record of a late Cretaceous Gondwanatherian

Francisco J. Goin Agustín G. Martinelli Sergio Soto Acuña Emma Carolina Vieytes Leslie M.E. Manríquez

Fil: Goin, Francisco Javier. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Division Paleontologia Vertebrados; Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - La Plata; Argentina

Mammal

10.1080/14772019.2019

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Citations (5)

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

Boletín Museo Nacional de Historia Natural (2020)

Francisco J. Goin Agustín G. Martinelli Sergio Soto‐Acuña Emma Carolina Vieytes Leslie M.E. Manríquez

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.

10.54830/bmnhn.v69.n1.2020.8

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Citations (14)

Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile

Research Square (Research Square) (2021)

Sergio Soto‐Acuña Alexander O. Vargas Jonatan Kaluza Marcelo Leppe João Francisco Botelho

Abstract Armoured dinosaurs are well known for forms that evolved specialized tail weapons: paired tail spikes in stegosaurs, and heavy tail clubs in advanced ankylosaurs1. Armoured dinosaurs from southern Gondwana are rare and enigmatic, but likely include the earliest branches of Ankylosauria2-4. Here, we describe a mostly complete, semiarticulated skeleton of a small (about 2m) armoured dinosaur from the late Cretaceous of Magallanes in southernmost Chile, a region biogeographically related to West Antarctica5. Stegouros elengassen gen. et sp. nov. evolved a large tail weapon unlike any dinosaur: A flat, frond-like structure formed by 7 pairs of laterally projecting osteoderms encasing the distal half of the tail. Stegouros shows ankylosaurian cranial characters, but a largely primitive postcranial skeleton, with some stegosaur-like characters. Phylogenetic analyses placed Stegouros in Ankylosauria, and specifically related to Kunbarrasaurus from Australia6 and Antarctopelta from Antarctica7, forming a clade of Gondwanan ankylosaurs that split earliest from all other ankylosaurs. Large osteoderms and specialized tail vertebrae in Antarctopelta suggest it had a tail weapon similar to Stegouros. We propose a new clade, the Parankylosauria, to include the first ancestor of Stegouros but not Ankylosaurus, and all descendants of that ancestor.

Ancestor

10.21203/rs.3.rs-821192/v1

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