La Amarga Formation

Amargasaurus (; "La Amarga lizard") is a genus of sauropod dinosaur from the Early Cretaceous epoch (129.4–122.46 mya) of what is now Argentina. The only known skeleton was discovered in 1984 and is virtually complete, including a fragmentary skull, making Amargasaurus one of the best-known sauropods of its epoch. Amargasaurus was first described in 1991 and contains a single known species, Amargasaurus cazaui. It was a large animal, but small for a sauropod, reaching in length. Most distinctively, it sported two parallel rows of tall spines down its neck and back, taller than in any other kno

Zapalasaurus is an extinct genus of sauropod dinosaur from the Early Cretaceous-aged La Amarga Formation of what is today Patagonia. The type and only species is Z. bonapartei.

Amargatitanis (meaning "Amarga giant") is a genus of dicraeosaurid sauropod dinosaur (a type of large, long-necked quadrupedal herbivorous dinosaur) from the Barremian-aged (Lower Cretaceous) La Amarga Formation of Neuquén, Argentina. It is known from a single, incomplete postcranial skeleton consisting of a partial hindlimb, ischium, and two vertebrae. These remains were unearthed by Argentine paleontologist José Bonaparte in 1983 during an expedition by the Museo Argentino de Ciencias Naturales and later described as a new genus and species, Amargatitanis macni by Sebastián Apesteguía. The g

thumb|left|Size compared to a human; anatomical details are speculative Ligabueino (meaning "Ligabue's little one") is a genus of abelisauroid theropod dinosaur named after its discoverer, Italian doctor Giancarlo Ligabue. It is known only from an extremely fragmentary specimen, measuring 79 cm (2.6 ft) long, found in the La Amarga Formation. In spite of initial reports that it was an adult, the unfused vertebrae indicate that the specimen was a juvenile. It was a theropod and lived during the Early Cretaceous Period (Barremian to early Aptian), in what is now Patagonia. Contrary to

Vincelestes ("Vince's thief") is an extinct genus of mammal that lived in what is now South America during the Early Cretaceous. It is closely related to modern therian mammals as part of Cladotheria.

Amargasuchus is an extinct genus of notosuchian crocodylomorph from the Barremian to Aptian La Amarga Formation of Argentina. Amargasuchus is only known from a single specimen, a partial maxilla of small size described in 1988. It was originally assigned to the family Trematochampsidae, but this clade has since been abandoned. Today, Amargasuchus is associated with either the clade Pepesuchinae or Itasuchidae, which are nearly identical in some studies. Amargasuchus inhabited a terrestrial paleoenvironment that existed during the Early Cretaceous in the Neuquén basin and was characterized by a