Lisandro Formation

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Lisandro Formation
Stratigraphic range: Late Cenomanian-Early Turonian
~94–91 Ma
TypeGeological formation
Unit ofNeuquén Group
 Río Limay Subgroup
UnderliesRío Neuquén Subgroup
 Portezuelo Formation
OverliesHuincul Formation
Thickness35–75 m (115–246 ft)
Lithology
PrimarySiltstone, claystone
OtherMudstone, sandstone
Location
Coordinates34°06′S 68°54′W / 34.1°S 68.9°W / -34.1; -68.9Coordinates: 34°06′S 68°54′W / 34.1°S 68.9°W / -34.1; -68.9
Approximate paleocoordinates40°06′S 64°48′W / 40.1°S 64.8°W / -40.1; -64.8
RegionMendoza, Río Negro & Neuquén Provinces
Country Argentina
ExtentNeuquén Basin
Type section
Named forCerro Lisandro
Named byHerrero Ducloux
Year defined1938
Lisandro Formation is located in Argentina
Lisandro Formation
Lisandro Formation (Argentina)

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.[1]

The type locality of the Lisandro Formation is the hill known as Cerro Lisandro in Neuquén Province.[2] 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.[1][3]

Fossil content[edit]

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

See also[edit]

References[edit]

  1. ^ a b Sánchez et al., 2006
  2. ^ Fossa Mancini et al., 1938
  3. ^ Leanza et al., 2004, p.69
  4. ^ Bernardo González Riga, Leonardo Ortiz David (2014). "A new titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous (Cerro Lisandro Formation) of Mendoza Province, Argentina". Ameghiniana. in press. doi:10.5710/AMGH.24.12.2013.1889.

Bibliography[edit]