Paleontology in Uruguay

In Uruguay, paleontology has been influenced by various academic centers, both Uruguayan and foreign; in recent decades, it has become professionalized mainly at the University of the Republic. There is a significant local bibliographic output that offers a historical perspective and an overview of the current state of the science. The most developed areas include paleobiology and the systematics of Quaternary faunas, biostratigraphy, and research technologies, in close relation to disciplines such as physics, oceanography, archaeology, and design. Noteworthy are the numerous findings of megafauna mammals, which later became extinct, some in the Late Pleistocene extinctions, others due to human activity in a long time ago , such as Lestodon, Glyptodon, Doedicurus, Notiomastodon, etc. The paleontological locality of Arroyo del Vizcaíno, Canelones Department, was declared a National Monument in 2021.

History During the Spanish colonial period, naturalist Félix de Azara explored the region. Although he was not a professional paleontologist, he took notes on his discoveries in geography, flora, fauna, climate, etc.; as such, he contributed to the development of local natural history. His writings influenced Charles Darwin and other scientists. Interestingly, in 1833 Darwin purchased the skull of "one of the strangest animals ever discovered" in Uruguay. Based on this material, in 1837 Richard Owen described the Toxodon platensis; as a matter of fact, the great English palaeontologist identified several genera of extinct species from material found in Uruguay. The true pioneer of Uruguayan paleontology was the clergyman Dámaso Antonio Larrañaga, who actively promoted the creation of the National Museum of Natural History. Decades later, some paleontologists from Argentina were very influential, such as Florentino Ameghino and Lucas Kraglievich. In 1932, while drilling a water well in Guichón, several skeletal remains belonging to seven specimens of small terrestrial crocodiles were discovered. The remains were sent to Argentine paleontologists and, after several vicissitudes, Carlos Rusconi recognized a new genus in 1933, Uruguaysuchus. It has been important from a taxonomic and phylogenetic point of view in the Crocodyliformes group of the Cretaceous period in Gondwana (Guichón Formation). To date, Uruguaysuchus remains the best-represented Mesozoic vertebrate in Uruguay. A remarkable discovery was made of the biggest rodent ever found. In 1966, on the cliffs of Barrancas de San Gregorio, on Kiyú beach in the San José Department, material corresponding to enormous fossils was collected, including a fragment of the lower jaw that preserves the lower part of the incisor, the premolar, the first two molars, a cavity corresponding to the third molar, and the ramus (the part of the lower jaw that joins the skull). Uruguayan paleontologists Julio César Francis and Álvaro Mones made it the type specimen of a new genus and species, Artigasia magna, named in honor of the Uruguayan national figure José Artigas. Years later, Mones renamed the genus Josephoartigasia. In 2008, Uruguayan paleontologist Andrés Rinderknecht and Uruguayan physicist Rudemar Ernesto Blanco described another species, J. monesi, based on a huge, nearly complete skull, also from Barrancas de San Gregorio. The name pays tribute to Mones for his work on South American rodents. A huge dinosaur (approximately 16 meters long) was described by Soto et al. in 2024 with the name Udelartitan celeste, based on material found in Quebracho, Paysandú. The name "Udelartitan" pays tribute to the University of the Republic, and "celeste" refers to the Uruguayan national soccer team. It is considered the first endemic dinosaur species in Uruguay. In 2022, research was conducted in the Tacuarembó Formation. A tooth belonging to a new species of Jurassic dinosaur was found, belonging to the Abelisauridae family. It is the third Jurassic carnivorous dinosaur found in Uruguay, following previous records of Ceratosaurus and Torvosaurus.

Museums Several museums display notable paleontological collections. Among others:

National Museum of Natural History (Montevideo) Municipal Museum (Colonia del Sacramento) Prof. Roselli Municipal Museum (Nueva Palmira) Prof. Armando Calcaterra Palaeontological Museum (Real de San Carlos) In Tacuarembó Department there is an open-air museum in form of a trail, the Dinosaur Route (Spanish: Ruta de los Dinosaurios, the first of its class in the country. It is made up of dinosaur footprints and other paleontological material.

Paleontologists Álvaro Mones Graciela Piñeiro Francisco Lucas Roselli Armando Calcaterra

Fossils found in Uruguay

Trace fossils In the departments of Florida, Soriano and Durazno were found:

Coprinisphaera Corimbatichnus fernandezi Elipsoideichnus meyeri Monesichnus Palmiraichnus Rebuffoichnus Teisseirei Uruguay

Mammals In the territory of present-day Uruguay, it is possible to find a large number of skeletal remains that allow us to reconstruct extinct mammals. The superorder Xenarthra stands out (ground sloths, cingulates.

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