Lotena Formation
Appearance
Lotena Formation | |
---|---|
Stratigraphic range: Late Callovian-Early Oxfordian ~ | |
Type | Geological formation |
Unit of | Lotena Group |
Sub-units | La Estrechura, El Pichanal & El Vado Members |
Underlies | La Manga Formation |
Overlies | Cuyo Group Lajas Formation |
Thickness | 50–167 m (164–548 ft) |
Lithology | |
Primary | Sandstone, conglomerate |
Other | Limestone, shale |
Location | |
Coordinates | 38°36′S 70°12′W / 38.6°S 70.2°W |
Approximate paleocoordinates | 35°54′S 31°42′W / 35.9°S 31.7°W |
Region | Neuquén Basin Mendoza & Neuquén Provinces Northern Patagonia |
Country | Argentina |
Extent | 2,500 km2 (970 sq mi) |
Type section | |
Named for | Cerro Lotena |
Named by | Weaver |
Year defined | 1931 |
The Lotena Formation is a geologic formation dated from the Late Callovian to Early Oxfordian in the Neuquén Basin in Mendoza Province, Argentina.[1] The formation, first defined by Weaver in 1931 and named after Cerro Lotena,[2] consists of fluvial conglomerates, calcareous sandstones and marine limestones and shales.[2][3] The Lotena Formation is overlain by the La Manga Formation and overlies the Lajas Formation of the Cuyo Group.[4] Initially, the fossil find of the pterosaur Herbstosaurus pigmaeus was reported from the formation,[5] but this fossil was found in the younger Vaca Muerta.[6] The formation is a reservoir rock in the Neuquén Basin.
See also
- Los Molles Formation, contemporaneous formation of the Neuquén Basin
- Cañadón Calcáreo Formation, contemporaneous formation of the Cañadón Asfalto Basin
References
- ^ Lotena Formation at Fossilworks.org
- ^ a b Zanettini et al., 2010, p.25
- ^ Veiga et al., 2011, p.174
- ^ Veiga et al., 2011, p.178
- ^ Wellnhofer, 1991, p.81
- ^ Herbstosaurus at Fossilworks.org
Bibliography
Categories:
- Geologic formations of Argentina
- Late Jurassic South America
- Middle Jurassic South America
- Jurassic System of South America
- Jurassic Argentina
- Callovian Stage
- Oxfordian Stage
- Conglomerate formations
- Sandstone formations
- Shale formations
- Limestone formations
- Fluvial deposits
- Reservoir rock formations
- Neuquén Basin
- Geology of Mendoza Province
- Geology of Neuquén Province
- Geology of Patagonia