Bajo de la Carpa Formation

Alvarezsaurus (; "Don Gregorio Alvarez's lizard") is a genus of alvarezsaurid dinosaur from the Late Cretaceous, living in Argentina approximately 86 - 83 million years ago. It was a small dinosaur, measuring long and weighing approximately . It was found in the Bajo de la Carpa Formation and was named by paleontologist José Bonaparte in 1991 after the historian Don Gregorio Alvarez. The type species is A. calvoi.

Achillesaurus is a genus of alvarezsaurid theropod dinosaur from the Santonian-aged (Late Cretaceous) Bajo de la Carpa Formation of Rio Negro, Argentina. It contains one species, Achillesaurus manazzonei.

Bonitasaura is a genus of titanosaurian dinosaur hailing from uppermost layers of the Late Cretaceous (Santonian) Bajo de la Carpa Formation, Neuquén Group of the eastern Neuquén Basin, located in Río Negro Province, Northwestern Patagonia, Argentina. The remains, consisting of a partial sub-adult skeleton jumbled in a small area of fluvial sandstone, including a lower jaw with teeth, a partial vertebrae series, and limb bones, were described by Sebastian Apesteguía in 2004.

Velocisaurus ("swift lizard") is a genus of noasaurid theropod dinosaur from the Late Cretaceous period of Argentina.

Rinconsaurus is a genus of titanosaur sauropod dinosaur from the Late Cretaceous in what is now Argentina. The type species, Rinconsaurus caudamirus, was described by Calvo and Riga in 2003, and is based on three partial skeletons.

Patagopteryx is an extinct monotypic genus of euornithean dinosaurs that lived during the Late Cretaceous, around 80 mya, in what is now the Sierra Barrosa in northwestern Patagonia, Argentina. About the size of a chicken, it is the earliest known unequivocal example of secondary flightlessness: its skeleton shows clear indications that the ancestors of Patagopteryx were flying animals, though other studies find earlier diverging theropods to be secondarily flightless.

Llukalkan (Mapuche for "one who causes fear") is a genus of abelisaurid theropod dinosaur from the Late Cretaceous Bajo de la Carpa Formation of Argentina. The type species is Llukalkan aliocranianus.

Notosuchus (; 'southern crocodile') is an extinct genus of South American notosuchian crocodyliforms. It was terrestrial, living approximately 85 million years ago in the Santonian stage of the Late Cretaceous.

Traukutitan is a genus of titanosaur sauropod dinosaur which lived during the late Cretaceous (Santonian age).

Tratayenia is an extinct genus of megaraptoran theropod dinosaurs known from remains found in the Late Cretaceous (Santonian age) Bajo de la Carpa Formation of Argentina. The type and only species, Tratayenia rosalesi, was described in March 2018.

Dinilysia (meaning "terrible ilysia") is an extinct genus of snake from the Late Cretaceous (Coniacian) of South America. Dinilysia was a relatively large ambush predator, measuring approximately long. The skull morphology of Dinilysia is similar to boids, suggesting that it was able to consume large prey., Living in a desert-like environment, Dinilysia is likely a terrestrial or a semi-fossorial animal. thumb|left|Hypothetical appearance of Dinilysia patagonica (reconstruction based on skeletal and other features).

Overosaurus (meaning "Overo lizard", after the Cerro Overo locality) is an extinct genus of sauropod dinosaurs, containing only a single species, Overosaurus paradasorum. This species lived approximately 86 to 84 million years ago during the latter part of the Cretaceous Period in what is now Patagonia (in southern Argentina). Overosaurus paradasorum was relatively small compared to other sauropods from Patagonia, like the saltasaurids and other aeolosaurines, estimated as approximately . It was a ground-dwelling herbivore.

Viavenator (meaning "road hunter") is a genus of carnivorous abelisaurid theropod dinosaur that lived in the Santonian-aged (Late Cretaceous) Bajo de la Carpa Formation of Argentina. Only a single species is known, V. exxoni, formally described in 2016 by Filippi and colleagues.

Inawentu (meaning "imitator") is an extinct genus of titanosaurian sauropod dinosaur from the Late Cretaceous Bajo de la Carpa Formation of Argentina. The genus contains a single species, I. oslatus, known from a partial articulated skeleton including the skull. The square-shaped jaw of Inawentu demonstrates convergent characteristics with rebbachisaurids.

Diuqin (meaning "bird of prey") is an extinct genus of unenlagiine theropod dinosaurs from the Late Cretaceous (Santonian) Bajo de la Carpa Formation of Argentina. The genus contains a single species, Diuqin lechiguanae, known from a humerus and fragmentary vertebrae.

Neuquenornis volans is a species of enantiornithean birds which lived during the late Cretaceous period in today's Patagonia, Argentina. It is the only known species of the genus Neuquenornis. Its fossils were found in the Santonian Bajo de la Carpa Formation, dating from about 85-83 million years ago. This was a sizeable bird for its time, with a tarsometatarsus 46.8mm long. Informal estimates suggest that it measured nearly 30 cm (12 in) in length excluding the tail.

Comahuesuchus is an extinct genus of notosuchian crocodylomorphs from the late Cretaceous of Argentina. It was described by palaeontologist José Bonaparte in 1991. The type species is C. brachybuccalis from the Santonian Bajo de la Carpa Formation. In 2023 another species, C. bonapartei from the Sierra Barrosa Formation and Portezuelo Formation, was assigned to the genus.

Microcoelus (meaning "small hollow") is a dubious genus of small titanosaurian sauropod dinosaur from the Late Cretaceous (Santonian stage) Bajo de la Carpa Formation, Argentina. It is known from only a single dorsal vertebra, although a left humerus was formerly referred to this taxon, but it is now considered to belong to Neuquensaurus. The type (and only known) species is M. patagonicus, described by British paleontologist Richard Lydekker in 1893.

Lomasuchus is an extinct genus of peirosaurid notosuchian known from the Late Cretaceous (Santonian stage) of Neuquén Province, western central Argentina. It contains a single species, Lomasuchus palpebrosus.

Neuquensuchus (meaning "Neuquén crocodile", referring to the city) is an extinct genus of crocodyliform from the Santonian-age Upper Cretaceous Bajo de la Carpa Formation of Neuquén Province, Argentina. The known remains were discovered on the campus of Universidad Nacional del Comahue in the city of Neuquén. Neuquensuchus was named by Lucas E. Fiorelli and Jorge O. Calvo in a publication dated to 2007, but which became available in 2008. The type species is N. universitas, in recognition of its discovery locality. Unlike the great majority of crocodyliforms, its shin was longer than its thigh

Cynodontosuchus is an extinct genus of baurusuchid mesoeucrocodylian. Fossils have been found from Argentina of Late Cretaceous age from the Bajo de la Carpa Formation (dating back to the Santonian), the Pichi Picun Leufu Formation (dating back to the Coniacian and Santonian). the Tiupampan Santa Lucía Formation of Bolivia.

Mahuidacursor (meaning "mountain runner", meaning "mountain" in Mapudungun) is a genus of basal ornithopod dinosaur from the Santonian Bajo de la Carpa Formation of the Neuquén Basin in northern Patagonia, Argentina. The type and only species is M. lipanglef.

Peirosaurus is an extinct genus of peirosaurid crocodylomorph known from the Late Cretaceous period (late Maastrichtian stage) of Minas Gerais, southern Brazil. It contains a single species, Peirosaurus torminni. It is the type genus of the family Peirosauridae.