Lisandro Formation
{{Short description|Geological formation in Argentina}}
{{Infobox rockunit
| name = Lisandro Formation
| image =
| caption =
| type = Geological formation
| period = Turonian
| age = Middle-Late Turonian
~{{fossil range|93.4|90.5}}
| prilithology = Siltstone, claystone
| otherlithology = Mudstone, sandstone
| namedfor = Cerro Lisandro
| namedby = Herrero Ducloux
| year_ts = 1938
| region = Mendoza, Río Negro & Neuquén Provinces
| country = Argentina
| coordinates = {{coord|34.1|S|68.9|W|display=inline,title}}
| paleocoordinates = {{coord|40.1|S|64.8|W|display=inline}}
| unitof = Neuquén Group
Río Limay Subgroup
| subunits =
| underlies = Río Neuquén Subgroup
Portezuelo Formation
| overlies = Huincul Formation
| thickness = {{convert|35|-|75|m|ft|abbr=on}}
| extent = Neuquén Basin
| area =
| map = {{Location map+ | Argentina
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | Argentina
| lat_deg = -34.1
| lon_deg = -68.9
| mark = Lightgreen pog.svg
| marksize = 12
}}
}}
| map_caption =
}}
__NOTOC__
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.Sánchez et al., 2006
The type locality of the Lisandro Formation is the hill known as Cerro Lisandro in Neuquén Province.Fossa Mancini et al., 1938 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 {{convert|35|and|75|m|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.Leanza et al., 2004, p. 69
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{{cite journal|last1=Panzeri |first1=K. M. |last2=Guzmán |first2=F. A. |title=Unveiling the histology and anatomy of the lungfish Chaoceratodus portezuelensis (Sarcopterygii: Dipnoi) from the Portezuelo and Cerro Lisandro formations (Upper Cretaceous) of Argentine Patagonia |year=2024 |journal=Palaeontologia Electronica |volume=27 |issue=2 |at=27.2.a42 |doi=10.26879/1408 |doi-access=free }})
- 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{{Cite journal|author=Bernardo González Riga, Leonardo Ortiz David |title=A new titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous (Cerro Lisandro Formation) of Mendoza Province, Argentina |journal=Ameghiniana |year=2013 |volume=in press |doi=10.5710/AMGH.24.12.2013.1889 |hdl=11336/3819 |hdl-access=free }}
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
{{reflist|20em}}
= Bibliography =
- {{cite journal |last1=Fossa Mancini |first1=E. |author2-link=Egidio Feruglio |last2=Feruglio |first2=E. |last3=Yussen de Campana |first3=J.C. |year=1938 |title=Una reunión de geólogos de YPF y el problema de la terminología estratigráfica |language=es |trans-title=A YPF geologists' reunion and the problem of stratigraphy terminology |journal=Boletín de Informaciones Petroleras |volume=15 |pages=1–67}}
- {{cite journal |last1=Leanza |first1=H.A. |last2=Apesteguia |first2=S. |author3-link=Fernando Novas |last3=Novas |first3=F.E. |last4=De la Fuente |first4=M.S. |year=2004 |title=Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages |url=https://www.researchgate.net/publication/257047651 |journal=Cretaceous Research |volume=25 |issue=1 |pages=61–87 |doi=10.1016/j.cretres.2003.10.005 |bibcode=2004CrRes..25...61L |accessdate=2019-02-16}}
- {{cite journal |last1=Sánchez |first1=María Lidia |last2=Heredia |first2=Susana |last3=Calvo |first3=Jorge O. |year=2006 |title=Paleoambientes sedimentarios del Cretácico Superior de la Formación Plottier (Grupo Neuquén), Departamento Confluencia, Neuquén |language=es |trans-title=Sedimentary paleoenvironments in the Upper Cretaceous Plottier Formation (Neuquen Group), Confluencia, Neuquén |url=https://www.researchgate.net/publication/262615949 |journal=Revista de la Asociación Geológica Argentina |volume=61 |pages=3–18 |accessdate=2019-02-16}}
Category:Geologic formations of Argentina
Category:Upper Cretaceous Series of South America
Category:Siltstone formations of Argentina
Category:Fossiliferous stratigraphic units of South America
Category:Paleontology in Argentina
Category:Geology of Mendoza Province