• Source: Lisandro Formation

The Lisandro Formation, alternatively known as the Cerro Lisandro Formation, is a Late Cretaceous (Late Cenomanian to Early Turonian) geologic formation with outcrops in the Neuquén, Río Negro and Mendoza Provinces of Argentina. It is the youngest formation within the Río Limay Subgroup, the lowest section of the Neuquén Group. Formerly that subgroup was treated as a formation, and the Lisandro Formation was known as the (Cerro) Lisandro Member.
The type locality of the Lisandro Formation is the hill known as Cerro Lisandro in Neuquén Province. This formation conformably overlies the Huincul Formation, and it is in turn overlain by the Portezuelo Formation, which is a part of the Río Neuquén Subgroup.
The Lisandro Formation varies between 35 and 75 metres (115 and 246 ft) thick, the thinnest of the three formations in its subgroup. It is composed of siltstones and claystones, red in color, which have been interpreted as a swampy to fluvial environment. Usually, the red Lisando Formation rocks are easy to distinguish from the greenish or yellowish deposits of the Huincul Formation.




Fossil content


Not many dinosaurs are represented in the Lisandro Formation; other types of animals are frequently found. Fossils documented from this formation are:

freshwater bivalve molluscs
fish (Ceratodus and Chaoceratodus)
turtles
a carcharodontosaurid theropod
crocodilians
an abelisauroid theropod
"Bayosaurus pubica"
at least one bird
ornithopods (including Anabisetia)
a peirosaurid Bayomesasuchus hernandezi
a titanosaur sauropod Quetecsaurus rusconii




See also


List of fossil sites
Bajo Barreal Formation, contemporaneous formation of the Golfo San Jorge Basin
Mata Amarilla Formation, contemporaneous formation of the Austral Basin
List of dinosaur bearing rock formations




References






= Bibliography

=
Fossa Mancini, E.; Feruglio, E.; Yussen de Campana, J.C. (1938). "Una reunión de geólogos de YPF y el problema de la terminología estratigráfica" [A YPF geologists' reunion and the problem of stratigraphy terminology]. Boletín de Informaciones Petroleras (in Spanish). 15: 1–67.
Leanza, H.A.; Apesteguia, S.; Novas, F.E.; De la Fuente, M.S. (2004). "Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages". Cretaceous Research. 25 (1): 61–87. Bibcode:2004CrRes..25...61L. doi:10.1016/j.cretres.2003.10.005. Retrieved 2019-02-16.
Sánchez, María Lidia; Heredia, Susana; Calvo, Jorge O. (2006). "Paleoambientes sedimentarios del Cretácico Superior de la Formación Plottier (Grupo Neuquén), Departamento Confluencia, Neuquén" [Sedimentary paleoenvironments in the Upper Cretaceous Plottier Formation (Neuquen Group), Confluencia, Neuquén]. Revista de la Asociación Geológica Argentina (in Spanish). 61: 3–18. Retrieved 2019-02-16.

Kata Kunci Pencarian:

• Lisandro Formation
• Lisandro
• Huincul Formation
• Portezuelo Formation
• Neuquén Group
• List of South American dinosaurs
• List of fossil sites
• Bajo Barreal Formation
• List of informally named dinosaurs
• Los Bastos Formation